研究者紹介システム
| 岡村 秀雄 |  |
| オカムラ ヒデオ | |
| 内海域環境教育研究センター | |
| 教授 | |
| 自然科学関係 |
研究者情報
所属
【主配置】
内海域環境教育研究センター【配置】
海事科学部 海洋安全システム科学科, 大学院海事科学研究科 海事科学専攻, 大学院海事科学研究科 附属国際海事研究センター
学位
授業科目
- 沿岸海洋学（2012年度以前生/現：内海域環境学）, 海事科学部, 2019
- 海事理化学実験２, 海事科学部, 2019
- 海事理化学実験２, 海事科学部, 2019
- 海洋安全システム科学実験, 海事科学部, 2019
- 海洋安全システム科学実験１（2016年度以降生用）, 海事科学部, 2019
- 海洋安全システム科学通論, 海事科学部, 2019
- 海洋安全システム科学通論（2016年度以降生用）, 海事科学部, 2019
- 内海域環境学, 海事科学部, 2019
- 内海域環境学１, 海事科学部, 2019
- 内海域環境学２(海洋安全システム科学科用）, 海事科学部, 2019
- 水環境科学２, 大学院海事科学研究科 海事科学専攻, 2019
- 水環境学特論１, 大学院海事科学研究科 海事科学専攻, 2019
ジャンル
コメントテーマ
研究活動
研究キーワード
研究分野
論文
- 日本マリンエンジニアリング学会, 2019年10月, 第89回マリンエンジニアリング学術講演会 講演論文集, 日本語ディーゼル機関からのススの変異原性と多環芳香族炭化水素の関係
研究論文（研究会，シンポジウム資料等）
- The Society of Naval Architects of Korea (SNAK), 2018年10月, 8th Pan Asian Association of Maritime Engineering Societies, Advanced Maritime Engineering Conference 2018 (Busan), pp.597 - 601, 英語Evaluation of Bio-Gasoline Combustion in Outboard Spark Ignition Engine
[査読有り]
研究論文（国際会議プロシーディングス）
- 日本水環境学会, 2018年09月, 第21回日本水環境学会シンポジウム 講演集（島根）, pp.157, 日本語船舶エンジンすす中の有機汚染物質分析
研究論文（研究会，シンポジウム資料等）
Copper pyrithione (CuPT) is a biocide, used worldwide to prevent biofouling on submerged surfaces. In aquatic environments it rapidly degrades, however, one of the degradation products (HPT) is known to react with cupric ion back to its parent compound. Not much is known about the behavior and toxicity of CuPT and its degradation product HPT in different water systems. Hence, our aim was to investigate the ecotoxicity of CuPT, HPT as well as Cu2+ to the brine shrimp Artemia salina in natural seawater and organic matter-free artificial seawater. Moreover, in order to elucidate the influence of ionic strength of water on CuPT toxicity, tests were performed in water media with modified salinity. The results showed that CuPT was the most toxic to the exposed crustaceans in a seawater media with the highest salinity and with no organic matter content. HPT in a presence of cupric ion converted to CuPT, but the measured CuPT concentrations and the mortality of A. salina in natural water were lower than in artificial water. The toxicity of CuPT to A. salina was significantly influenced by the organic matter content, salinity, and proportions of constituent salts in water. In a combination with cupric ion, non-hazardous degradation product HPT exhibits increased toxicity due to its rapid transformation to its parent compound.
ACADEMIC PRESS INC ELSEVIER SCIENCE, 2018年01月, ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, 147, 132 - 138, 英語[査読有り]
研究論文（学術雑誌）
- Evaluation of Bio-gasoline Combustion in Outboard Spark Ignition Engine
In present days, ethanol mixed gasoline, so called bio-gasoline, is used as an alternative fuel in spark ignition engines. Especially, it is more used in the prime mover for the land in order to suppress the global warming and the air pollution, and establish as a sustainable energy resource. Outboard engine is a compact propulsion device usually used in small size boats. It co
The Japan Institute of Marine Engineering (JIME), 2017年10月, The 11th International Symposium on Marine Engineering (ISME2017 TOKYO), (A03-208), pp.213 - 217, 英語研究論文（国際会議プロシーディングス）
Transient isotachophoresis (tITP) with a system-induced terminator (SIT) was developed for capillary zone electrophoresis (CZE) determination of aniline (An(+)) and pyridine (Py+) in sewage samples. After sample injection, a water vial was set at the sample-inlet side. Then voltage was applied to generate a system-induced terminator (H+). Experiments and simulations revealed a concentration effect by tITP with an SIT: background electrolyte (BGE) -100 mM acetic acid (AcOH) and 50 mM NaOH (pH 4.6); detection wavelength -200 nm for An(+) and 254 nm for Py+; vacuum injection period -15 s (190 nL); SIT generation -10 kV applied for 80 s with the sample inlet side anode; separation voltage -20 kV with the sample inlet side anode. The limits of detection (LODs, S/N = 3) of An(+) and Py+ respectively reached 10 and 42 mu g/L, with good repeatability (peak area RSDs <= 6.9%) and calibration graph linearity (R-2 = 0.9997). The proposed method was applied for determination of An(+) and Py+ in sewage samples. Recoveries of An(+) (0.50 mg/L) and Py+ (2.0 mg/L) in spiked sewage samples were 94-104%. (C) 2017 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2017年08月, JOURNAL OF CHROMATOGRAPHY A, 1511, 132 - 137, 英語[査読有り]
研究論文（学術雑誌）
Perfluoroalkyl acids (PFAAs) including perfluoroalkyl sulfonates (PFSAs) and perfluoroallcyl carboxylates (PFCAs) were analyzed in sediment samples taken from Ajifu Waterway in Osaka city, from Osaka Bay, and from Kagoshima Bay, as well as in fifteen seawater samples collected from Osaka Bay and coastal waters of Western Japan. In all sediment samples, only PFCAs were detected, and the highest concentration was determined in Ajifu Waterway, where Sigma PFAA was 58990 ng kg(-1) dry weight. The total concentrations of PFAAs in sea water samples ranged between the limit of quantification and 53.4 ng L-1, and perfluorohexanoic acid was the most prevalent and had the highest concentration of 37 ng L-1. The changes in the patterns and concentrations of PFAA5 in Osaka Bay and coastal waters of Western Japan indicate that the PFAAs in surface waters are influenced by sources from Keihanshin Metropolitan Area, mainly the Yodo River basin, and the dilution effect which naturally occurs during their transport to the Pacific Ocean. (C) 2016 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2017年03月, CHEMOSPHERE, 170, 260 - 265, 英語[査読有り]
研究論文（学術雑誌）
Reducing hydrogen sulfide concentration in eutrophic marine sediments is crucial to maintaining healthy aquatic ecosystems. Managing fly ash, 750 million tons of which is generated annually throughout the world, is another serious environmental problem. In this study, we develop an approach that addresses both these issues by mixing coal fly ash from coal-fired power plants with blast furnace cement to remediate eutrophic sediments. The purpose of this study is to optimize the mixing ratio of coal fly ash and blast furnace cement to improve the rate of hydrogen sulfide removal based on scientific evidence obtained by removal experiments and XAFS, XRD, BET, and SEM images. In the case of 10 mg-S L-1 of hydrogen sulfide, the highest removal rate of hydrogen sulfide was observed for 87 wt% of coal fly ash due to decreased competition of adsorption between sulfide and hydroxyl ions. Whereas regarding 100 mg-S L-1, the hydrogen sulfide removal rate was the highest for 95 wt% of coal fly ash. However, for both concentrations, the removal rate obtained by 87 wt% and 95 wt% were statistically insignificant. The crushing strength of the mixture was over 1.2 N mm(-2) when the coal fly ash mixing ratio was less than 95 wt%. Consequently, the mixing ratio of coal fly ash was optimized at 87 wt% in terms of achieving both high hydrogen sulfide removal rate and sufficient crushing strength. (C) 2016 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2017年02月, CHEMOSPHERE, 168, 384 - 389, 英語[査読有り]
研究論文（学術雑誌）
Hydrogen sulfide generated in eutrophic marine sediment is harmful for living organisms. It is therefore necessary to remove hydrogen sulfide from the sediment to restore benthic ecosystems. Previous studies revealed that granulated coal ash, which is a by-product of coal thermal electric power stations, could remove and oxidize hydrogen sulfide. In this study, we propose a simplified simulation model to estimate the hydrogen sulfide removal efficiency of granulated coal ash. Hydrogen sulfide concentrations in eutrophic marine sediment pore water with and without the application of granulated coal ash were calculated by the proposed model, and the outputs were compared with semi-field or field observation data. The model outputs reproduced the observed data well. Using the proposed model outputs, we suggest an optimum application dosage of granulated coal ash for remediating eutrophic marine sediment. (C) 2015 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2015年05月, MARINE POLLUTION BULLETIN, 94 (1-2), 55 - 61, 英語[査読有り]
研究論文（学術雑誌）
The imidazole fungicide miconazole (MCZ) and the antidepressant sertraline (SER) have the potential to adversely affect aquatic organisms when they are released into the environment. To assess if they could be broken down, MCZ and SER were treated with laccase and manganese peroxidase (MnP) from lignin-degrading white-rot fungi. The MnP-dependent lipid peroxidation system with Tween 80 containing unsaturated fatty acid was effective in eliminating MCZ and SER; the MnP-Tween 80 system helped eliminate 88% of MCZ and 85% of SER after 24 h of treatment. Furthermore, this system eliminated a metabolite of SER (desmethylsertraline or DSER), and no differences between the elimination rates of DSER and SER were observed throughout the treatment period. It was also confirmed that the MnP-Tween 80 system caused a complete loss of growth inhibition by MCZ of the gram-positive bacterium Bacillus subtilis and reduced the growth inhibition by SER of the green alga Pseudokirchneriella sub-capitate by 78% after 24 h of treatment. On the other hand, no appreciable elimination of MCZ and SER was obtained by treatment with laccase, MnP, or the laccase-mediator system with 1-hydroxybenzotriazole. (C) 2015 Elsevier Ltd. All rights reserved.
ELSEVIER SCI LTD, 2015年05月, INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 100, 79 - 84, 英語[査読有り]
研究論文（学術雑誌）
It is important to remove hydrogen sulfide to maintain healthy ecosystems as well as viable aquaculture activities in enclosed water bodies. Granulated coal ash with high adsorption capacity for hydrogen sulfide is a by-product generated from coal combustion processes in coal-fired power plants. The purposes of this study were to (1) verify the regeneration of the adsorption sites for hydrogen sulfide on the granulated coal ash by redox reaction which changes between oxic and anoxic conditions and (2) prove the regeneration mechanisms of the adsorption site which leads to high adsorption capacity for hydrogen sulfide. XAFS analyses of the granulated coal ash revealed that the adsorption site for hydrogen sulfide on the granulated coal ash was regenerated at least 10 times through oxidation of manganese oxide under oxic conditions. A positive correlation (r = 0.995) between the peak top energy of manganese XAFS in the GCA collected from field trial sites and the Eh of the sediments applied with the GCA was observed. These results proved that hydrogen sulfide was adsorbed and oxidized by the granulated coal ash during the stratified season. During the vertical mixing seasons, oxygen regenerates the adsorption site for hydrogen sulfide. It is concluded that this regeneration of adsorption site gives the granulated coal ash high adsorption capacity for hydrogen sulfide. (C) 2014 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, 2014年10月, CHEMICAL ENGINEERING JOURNAL, 254, 531 - 537, 英語[査読有り][招待有り]
研究論文（学術雑誌）
- Identification of sulfur species adsorbed on particulate matters from ship exhaust gas using XAFS analyses
ディーゼルエンジンから排出される粒子状物質(Particulate Matters, PM)にはさまざまな有害物質が含有される。その中で，燃料中の硫黄分は水と反応して硫酸塩(サルフェート)としてPMに吸着されると言われている。本研究では，A重油100％と，A重油にDMEを混合した次世代燃料について，模擬硫黄化合物(DBDS)を添加した場合のPMを解析した。解析は重量法による定量解析と，XAFS(X線)解析を行った。その結果，DME混合によってPM重量が減少すること，PMに含まれる硫黄化合物の分子構造形態を明らかにした。
2014年09月, Proceedings of the 18th Hiroshima International Symposium on Synchrotron Radiation, 18, 151 - 152, 英語[査読有り]
研究論文（国際会議プロシーディングス）
High levels of hydrogen sulfide are sometimes observed in the pore water of eutrophic sediments. It is important to reduce the hydrogen sulfide concentration to maintain health ecosystems as well as aquaculture activities in enclosed water bodies. The purpose of this study is to reveal the removal mechanism of hydrogen sulfide using carbonated steel slag produced through carbonation processes to alleviate alkaline impacts. Batch adsorption experiments revealed that hydrogen sulfide was adsorbed onto carbonated steel slag based on a pseudo-first-order kinetic model its adsorption maximum was 7.5mgg-1. The removal mechanisms of the hydrogen sulfide included (1) the formation of pyrite, and (2) oxidation to sulfur coupled with the reduction of manganese oxide on the carbonated steel slag. © 2013 Elsevier B.V.
2013年07月05日, Chemical Engineering Journal, 228, 843 - 849, 英語[査読有り][招待有り]
研究論文（学術雑誌）
- 2013年, J. Phys. Soc. Jpn., 82 (7), 1 - 74720, 英語
[査読有り]
研究論文（学術雑誌）
Prohibition of Ot (organotin) compounds was introduced in Japan in 1997 and worldwide from September 2008. This meant that the production of paints containing TBT compounds was stopped and alternatives to the available Ot antifoulants had to be developed. It has been claimed that the degradation by-products of these alternative antifoulants were less toxic than those of Ot compounds. Since the introduction of the alternative antifoulants, the accumulation of these compounds has been reported in many countries. However, the toxicity of these compounds was still largely unreported. In this research, the toxicity of the alternative Ot antifoulants TPBP (triphenylborane pyridine) and TPBOA (triphenylborane octadecylamine) and their degradation products on Crassostea gigas and Hemicentrotus pulcherrimus were tested. The results showed that toxic effects in Crassostea gigas was higher for each antifouling biocide than that in Hemicentrotus pulcherrimus. Also, while the toxicity of the Organoboron antifoulants and the Ots were the same, the former's degradation products were much less harmful. © 2013 by the authors licensee MDPI, Basel, Switzerland.
2013年01月, International Journal of Molecular Sciences, 14 (1), 421 - 433, 英語[査読有り]
研究論文（学術雑誌）
Triphenylborane-pyridine (TPBP) is an antifouling compound used in Asian countries, including Japan, and its residue has not been detected in aquatic environments to date. There are limited data on its fate for environmental management. The purpose of this study was to evaluate whether TPBP is degraded by metal ions in aquatic environments. TPBP with metal ions in 20mM sodium acetate buffer at pH 8.0 was placed at 25 degrees C in the dark for 24h. The concentrations of TPBP and its degradation products, such as diphenylboronic acid, phenylboronic acid (MPB), phenol, benzene, biphenyl, and boron were determined. The presence of copper ions (50mg/l), but not zinc or manganese ions, resulted in complete degradation of TPBP in 24h. The TPBP degradation was much faster than the boron production in the initial reaction (0-1h) with copper salts, depending on the copper salts tested. TPBP was degraded by copper ions (5mg/l) in 24h, producing phenol, MPB, biphenyl, and borate. Cu2+ as copper(II) chloride or copper(II) acetate led to complete degradation of TPBP, and ethylenediaminetetraacetic acid disodium salt addition suppressed the TPBP degradation. Cu+ as copper(I) acetate also completely degraded TPBP, and bathocuproine addition suppressed the TPBP degradation. This suggests that copper ions existing in natural environments might degrade TPBP released from antifouling paint into water, and this could be one of the important mechanisms to dissipate TPBP residues in aquatic environments.
TAYLOR & FRANCIS LTD, 2013年10月, ENVIRONMENTAL TECHNOLOGY, 34 (20), 2839 - 2844, 英語[査読有り]
研究論文（学術雑誌）
We proposed a capillary zone electrophoresis (CZE) procedure using field-amplified sample injection (FASI) for the simultaneous determination of pyridine-triphenylborane (PTPB) and its degradation products: diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol. The LODs for PTPB, DPB, MPB, and phenol were, respectively, 0.85, 0.88, 44, and 28 mu g L-1. The RSDs (n = 4) for the analytes listed above were in respective ranges of 6.2 - 14, 5.9 - 10, and 0.49 - 0.62% for the peak area, peak height, and migration time. The compounds were extracted from paint-waste samples collected from shipyards using a siliga-gel column. The extract was dissolved with acetonitrile containing 1% (v/v) pyridine. The samples were then analyzed using CZE, revealing respective concentrations of 0.076 - 0.53, 0.015 - 0.36, 1.7 - 22, and 1.2 - 13 mu g g(-1). The proposed FASI-CZE method is a simple and promising procedure that is expected to be useful for the determination of PTPB and its degradation products in paint wastes.
JAPAN SOC ANALYTICAL CHEMISTRY, 2012年12月, ANALYTICAL SCIENCES, 28 (12), 1191 - 1196, 英語[査読有り]
研究論文（学術雑誌）
- 2012年12月, 4th IWA Young Water Professional Conference 2012, 330 - 333, 英語Remediation of eutrophic sediments using industrial byproducts
研究論文（国際会議プロシーディングス）
- 日本分析化学会, 2012年10月, 分析化学, 61 (11), 925 - 930, 日本語
[査読有り]
研究論文（学術雑誌）
Copper pyrithione (CuPT2) and zinc pyrithione (ZnPT2) are two popular antifouling agents that prevent biofouling. Research into the environmental effects of metal pyrithiones has mainly focused on aquatic animal species such as fish and crustaceans, and little attention has been paid to primary producers. There have been few reports on residues in environmental matrices because of the high photolabile characteristics of the agents. Residue analyses and ecological effects of the metabolites and metal pyrithiones are not yet fully understood. This study was undertaken to assess the effects of CuPT2, ZnPT2, and six metabolites (PT2: 2,2'-dithio-bispyridine N-oxide, PS2: 2,2'-dithio-bispyridine, PSA: pyridine-2-sulfonic acid, HPT: 2-mercaptopyridine N-oxide, HPS: 2-mercaptopyridine, and PO: pyridine N-oxide) on a freshwater macrophyte. A 7-day static bioassay using axenic duckweed Lemna gibba G3 was performed under laboratory conditions. Toxic effects of test compounds were assessed by biomass reduction and morphological changes were determined in image analysis. Concentrations of ZnPT2 and CuPT2 and those of PT2 and HPT in the medium were determined by derivatizing 2,2'-dithio-bispyridine mono-N-oxide with pyridine disulfide/ethylene diamine tetra-acetic acid reagent that was equimolar with pyrithione. The toxic intensity of the compounds was calculated from the measured concentrations after 7-day exposure. ZnPT2, CuPT2, PT2, and HPT inhibited the growth of L. gibba with EC50 ranging from 77 to 140 mu g/l as calculated from the total frond number as the conventional index, whereas the other four metabolites had less effect even at 10 mg/l. The presence of the former four toxic derivatives resulted in abnormally shaped and unhealthily colored fronds, whose size was about 20% of the control fronds. EC50, calculated from the healthy frond area determined in image analysis, ranged from 10 to 53 mu g/l. Thus, image analysis as part of a duckweed bioassay can detect the toxic effects of pyrithione derivatives with 3-10 times higher sensitivity than the traditional index.
SPRINGER, 2012年05月, ECOTOXICOLOGY, 21 (4), 1102 - 1111, 英語[査読有り]
研究論文（学術雑誌）
- 環境毒性学会, 2012年, 環境毒性学会誌, 15 (2), 31 - 38, 日本語
[査読有り]
研究論文（学術雑誌）
- 2012年, 分析化学, 61 (11), 925 - 930, 日本語
[査読有り]
研究論文（学術雑誌）
Tetracycline antibiotics are widely used in human and veterinary medicine; however, residual amounts of these antibiotics in the environment are of concern since they could contribute to selection of resistant bacteria. In this study, tetracycline (TC), chlortetracycline (CTC), doxycycline (DC) and oxytetracycline (OTC) were treated with laccase from the white rot fungus Trametes versicolor in the presence of the redox mediator 1-hydroxybenzotriazole (HBT). High performance liquid chromatography demonstrated that DC and CTC were completely eliminated after 15 min, while TC and CTC were eliminated after 1 h. This system also resulted in a complete loss of inhibition of growth of Escherichia coli and Bacillus subtilis and the green alga Pseudokirchneriella subcapitata with decreasing tetracycline antibiotic concentration. These results suggest that the laccase-HBT system is effective in eliminating tetracycline antibiotics and removing their ecotoxicity. (C) 2011 Elsevier Ltd. All rights reserved.
ELSEVIER SCI LTD, 2012年01月, BIORESOURCE TECHNOLOGY, 103 (1), 498 - 501, 英語[査読有り]
研究論文（学術雑誌）
The environmental impact of two biocide-free antifouling paints, fluoropolymer and silicone types, painted on a test cylinder was assessed using a battery of ecotoxicity test and chemical analyses for organic micro-pollutants such as perfluoroalkyl substances (PFAS). A biocide paint containing zinc pyrithione (ZnPT2) and cuprous oxide was assessed as a positive control. A standardized laboratory rotating-cylinder method using each test cylinder with artificial seawater was performed for 45 days. After 1 h rotation, the leaked seawater was subjected for bioassay and chemical analyses twice weekly. The seawater extracts from the biocide paint showed adverse effects on bacteria, algae, and crustaceans, but those from the biocide-free paints did not. The leakage seawater from biocide-free paints, after 7-day continuous rotation, contained the same concentration levels of PFAS as blank seawater used to conduct the tests. Thus, no significant toxicities of the biocide-free paints were found under the conditions of this study. Simultaneous analysis of ZnPT2 and copper pyrithione (CuPT2) was developed using an HPLC with a polymeric resin column, showing that ZnPT2 was converted to CuPT2 by trans-chelation in the leakage seawater from the positive control paint. The experimental results using a laboratory rotating-cylinder method demonstrated that biocide-free paints did not markedly affect three species tested and no PFAS was detected. In contrast, biocide paint was significantly toxic to test species and toxicity of the extract on bacteria was partly responsible for CuPT2 produced in leakage seawater. Thus, a laboratory rotating-cylinder method may be applied for ecotoxicological assessment of antifouling paints.
TAYLOR & FRANCIS LTD, 2012年, TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY, 94 (3), 545 - 556, 英語[査読有り]
研究論文（学術雑誌）
- Can Dimethyl Ether Diminish Environmental Impacts of Diesel Exhaust Particulates from Marine Diesel Oil?
次世代燃料として，ジメチルエーテルを従来の燃料に混合して使用することを提案してきている。本研究では，排気微粒子に含有する有害物質を化学的手法により解析し，その有毒性などを明らかにすることを目的としている。化石燃料としてA重油やC重油にDMEを混合することで，微粒子状物質の絶対量は低減することは可能であるが，C重油＋DMEの場合には毒性が逆に増大する可能性があることが明らかになった。
The Japan Institute of Mairne Engineering, 2011年10月, The 9th International Symposium on Marine Engineering (ISME Kobe 2011), (C5-3), 1 - 4, 英語研究論文（国際会議プロシーディングス）
In September 2008, organotin (Ot) compounds were prohibited from being used worldwide. From 1997 onward in Japan, the production of paints containing TBT (tributylin) compounds was prohibited, and thus alternatives to Ot antifoulants have been used since then. It has been said that the decomposition characteristics of these materials are better than those of Ot compounds. The toxicity of alternative Ot antifoulants (e.g., diuron, irgarol 1051(A (R)), and Sea-Nine 211(A (R))) and Ot compounds (TBT and TPT (triphenyltin)), using oysters that inhabit a large area of Hiroshima Bay, were evaluated. The results showed that the toxicity of diuron and irgarol 1051 is very low, and the toxicity of Sea-Nine 211 is almost the same as that of TPT. Sea-Nine 211's effect was stronger on oysters than other shellfish, causing concern about the extent of Sea-Nine 211's impact on oyster development.
SPRINGER, 2011年07月, ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 61 (1), 128 - 134, 英語[査読有り]
研究論文（学術雑誌）
The non-steroidal anti-inflammatory drugs diclofenac (DCF) and mefenamic acid (MFA) were treated with the white rot fungus Phanerochaete sordida YK-624. DCF completely disappeared and MFA decreased by about 90% after 6 days of treatment. It was also confirmed that the fungus almost completely removed the acute lethal toxicity of DCF and MFA towards the freshwater crustacean Thamnocephalus platyurus after 6 days of treatment. Mass spectrometric and H-1 nuclear magnetic resonance analyses demonstrated that two mono-hydroxylated DCFs (4'-hydroxydiclofenac and 5-hydroxydiclofenac) and one di-hydroxylated DCF (4',5-dihydroxydiclofenac) were formed via fungal transformation. The four metabolites of MFA were identified as 3'-hydroxymethylmefenamic acid (mono-hydroxylated MFA), 3'-hydroxymethyl-5-hydroxymefenamic acid (di-hydroxylated MFA), 3'-hydroxymethyl-6'-hydroxymefenamic acid (di-hydroxylated MFA) and 3'-carboxymefenamic acid. These results suggest that hydroxylation catalyzed by cytochrome P450 (CYP) in P. sordida YK-624 may be involved in the elimination and detoxification of DCF and MFA. This notion was further supported by the fact that smaller decreases in DCF and MFA were observed in cultures of P. sordida YK-624 incubated with 1-aminobenzotriazole, a known inhibitor of CYP.
SPRINGER, 2010年09月, BIODEGRADATION, 21 (5), 681 - 689, 英語[査読有り]
研究論文（学術雑誌）
Carbamazepine (CBZP) is used as an antiepileptic drug and is highly persistent. In this study, CBZP was treated with laccase from white rot fungus Trametes versicolor in the presence of a redox mediator 1-hydroxybenzotriazole (HBT). A single treatment with laccase and HBT eliminated CBZP by about 22% after 24 h, and repeated treatments with laccase and HBT, which were added to the reaction mixture every 8 h, helped eliminate about 60% of CBZP after 48 h. This suggests that repeated treatment is effective in eliminating CBZP. Mass spectrometric analyses demonstrated that two degradation products of CBZP, 10,11-dihydro-10,11-epoxycarbarnazepine and 9(10H)-acridone, were formed via repeated treatment with laccase and HBT. (C) 2010 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2010年09月, JOURNAL OF HAZARDOUS MATERIALS, 181 (1-3), 1175 - 1178, 英語[査読有り]
研究論文（学術雑誌）
The antimicrobial and preservative agent triclosan (TCS) is an emerging and persistent pollutant with a ubiquitous presence in the aquatic environment. Thus. TCS was treated with manganese peroxidase (MnP), laccase and the laccase-mediator system with 1-hydroxybenzotriazole. MnP was most effective in eliminating TCS among the three enzymatic treatments, with TCS concentration being reduced by about 94% after 30 min following treatment with 0.5 nkat mL(-1) MnP and being almost completely eliminated after 60 min. Furthermore, MnP (0.5 nkat mL(-1)) caused the complete loss of bacterial growth inhibition by TCS after 30 min and reduced the algal growth inhibition of TCS by 75% and 90% after 30 and 60 min, respectively. These results strongly suggest that MnP is effective in removing the ecotoxicity of TCS. (C) 2010 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2010年08月, JOURNAL OF HAZARDOUS MATERIALS, 180 (1-3), 764 - 767, 英語[査読有り]
研究論文（学術雑誌）
A commercial organoborane compound, pyridine-triphenylborane (PTPB), is often applied to ship hulls as an anti-fouling agent. We developed capillary zone electrophoresis (CZE) with direct UV detection for the simultaneous determination of PTPB and its estimated degradation products: diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol. The limits of detection (LODs) for PTPB, DPB, MPB, and phenol were, respectively, 25, 30, 50, and 29 mu g/l at a signal-to-noise ratio of three. At concentrations of 0.5 mg/l, values of the relative standard deviation (RSD, n = 6, intra-day) of peak area were obtained, respectively, for PTPB, DPB, MPB, and phenol, as 4.1, 4.1, 4.7, and 3.4% for peak heights 3.6, 3.2, 1.7, and 1.4%, and for migration times 1.1, 1.1, 1.0, and 0.73%. The analytes were detected within 14 min. Simple photodegradation experiments were conducted to verify the usefulness of the proposed method for additional FTPB degradation investigations. (C) 2010 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2010年04月, JOURNAL OF CHROMATOGRAPHY A, 1217 (14), 2187 - 2190, 英語[査読有り]
研究論文（学術雑誌）
A commercial organoborane compound, pyridine-triphenylborane (PTPB), is often applied to ship hulls as an anti-fouling agent in order to keep them free from marine organisms, such as barnacles and bivalves. However, the degradation process of PTPB and its degradation products have not been well understood, because of lack of an analytical method for both PTPB and its estimated degradation products. We previously developed a procedure using capillary zone electrophoresis (CZE) with direct UV detection for the simultaneous determination of PTPB and its estimated degradation products, such as diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol. For this study, simple degradation experiments were carried out to verify the usefulness of the proposed method for further PTPB degradation investigations. That is to say, PTPB samples dissolved in acetonitrile were put in the open air and a dark place to examine the effects of the light intensity and the temperature on the degradation of PTPB. The sample solutions were analyzed by the CZE method with the elapse of time. As a result, it was suggested that the degradation of PTPB was significantly affected by the light intensity, rather than the temperature. It has consequently been demonstrated that the CZE method is a useful tool to elucidate the degradation process of PTPB and its degradation products.
JAPAN SOC ANALYTICAL CHEMISTRY, 2009年04月, 分析化学（Bunseki Kagaku）, 58 (4), 301 - 304, 日本語[査読有り]
研究論文（学術雑誌）
Triphenylborane pyridine (TPBP) is an alternative to organotin antifouling compounds. This work aimed to identify the unknown Peak #1, and to evaluate the ecotoxicity of TPBP and its degradation products. Peak #1 was produced from TPBP dissolved in acetonitrile under UV-A photolysis using a high-pressure mercury lamp. The Peak #1 fraction was purified using two-step column chromatography from a TPBP-acetonitrile solution. The major compound of the fraction was identified as being biphenyl from the (1)H NMR and (13)C NMR spectra. The ecotoxicity of four degradation products (diphenylborane hydroxide, phenylborane dillydroxide, phenol, and biphenyl) and TPBP towards two marine planktons were assessed. The 48 h LC(50) values of the crustacean, Arternia salina, were 0.13 mg L(-1) for TPBP, 14 mg L(-1) for biphenyl, 17 mg L(-1) for phenol, and >50 mg L(-1) for the other degradation products. The 72 h EC(50) values of the diatom, Skeletonema costatum, were 0.0022 mg L(-1) for TPBP, 1.2 mg L(-1) for biphenyl, and >2 mg L(-1) for the other degradation products, Thus, the ecotoxicity of biphenyl and the other degradation products were not high compared to the parent compound, TPBP. (c) 2008 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2009年03月, CHEMOSPHERE, 74 (9), 1275 - 1278, 英語[査読有り]
研究論文（学術雑誌）
- 2007年07月, 神戸大学大学院海事科学研究科紀要, No. 4, pp.147-154., 日本語神大5SDH-2加速器の一応用―海洋環境関連物質及び農作物の微量元素分析―
研究論文（学術雑誌）
The abiotic degradation of the new antifouling agent, triphenylborane pyridine (TPBP), was investigated in buffer solutions having different pH values (pH 5, 7, and 9), and in artificial and natural seawater to estimate environmental fate of TP13P. The TPBP in these waters was decomposed by a seven-day hydrolysis process at 50 degrees C both in the dark and a photolysis process under UV-A irradiation using a high-pressure mercury lamp for periods up to 24 h. TPBP hydrolysis was significantly enhanced by acidic pH solutions. The photolysis rate of TPBP was higher in acidic pH solutions than in neutral or basic pH solutions, and was highest in natural seawater, which could have contained naturally dissolved organic matter. Two degradation products, phenol and an unknown substance (Peak #1), were observed during the hydrolysis and photolysis studies of TPBP. The concentration of these substances after a one-day photolysis treatment was higher than after a seven-day hydrolysis treatment. The degradation rate of TPBP in the five test water samples was related to the simultaneous photolysis formation of phenol and Peak #1. However, the degradation rate of TPBP was not related to the formation of the hydrolysis products. Therefore, it is suggested that photodegradation of TPBP follows a different pathway to the hydrolysis degradation of TPBP. Our results indicate the chemical and photochemical reaction of TPBP in water occurs in natural aquatic environments. (c) 2006 Elsevier Ltd. Ali rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2007年05月, CHEMOSPHERE, 67 (10), 1904 - 1910, 英語[査読有り]
研究論文（学術雑誌）
Organotin compounds (OTs) and representative booster biocides were measured in sediment and mussels from Otsuchi Bay, Japan. The mean amounts of tributyltin (TBT) and triphenyltin (TPT) compounds in sediment were 13 mu g kg(-1) dry and 3 mu g kg(-1) dry, respectively. Representative booster biocides (Sea-Nine 211, Diuron, Dichlofluanid, Irgarol 1501, M1, which is a degradation compound of Irgarol 1051, and Copper pyrithione) were also detected in sediment from Otsuchi Bay. OT concentrations were higher than those of the measured booster biocides. Otsuchi Bay was divided into four parts by cluster analysis based on OT concentrations in sediment sampled from the bay. These areas included the vicinity of a shipyard, a small fishing port, the closed inner area of the bay, and the mouth of the bay. Higher concentrations of TBT and TPT and a higher ratio of TBT to total BTs were observed in the vicinity of the shipyard. A higher concentration of TPT in comparison with TBT was detected in a small fishing port. Furthermore, OT concentrations in the mouth of the bay were higher than those in the closed-off section. OT concentrations in mussels decreased with distance from the shipyard. Otsuchi Bay was then divided into three parts by cluster analysis based on the concentrations of representative booster biocides found in the bay's sediment. These areas included the vicinity of a shipyard, a small fishing port, and other sites. Concentrations of Diuron and Irgarol 1051 in the vicinity of a shipyard and a small fishing port were dramatically high in comparison with the other sites. Copper pyrithione and Dichlofluanid in addition to Diuron and Irgarol 1051 were also detected in the area of a small fishing port. The concentrations of antifouling biocides were highest in the water in front of the shipyard and showed a marked decrease with distance from the shipyard.
SPRINGER, 2007年02月, ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 52 (2), 179 - 188, 英語[査読有り]
研究論文（学術雑誌）
Toxicities of antifouling chemicals and natural marine samples were evaluated by three assays, among which bioluminescence assay using freshly incubated Vibrio fischeri (V. fischeri) cells (NZ assay) and MicroTox were regarded as short-term assays, and growth inhibition assay was conducted as long-term assay. Short-term toxicity levels evaluated by NZ assay were in good agreement with those by MicroTox assay for all of the samples examined. Based on the EC50 values of each chemical by respective assay, NZ assay showed prior reproducibility and similar levels of sensitivity when compared with those of MicroTox assay. On the other hand, growth inhibition assay showed lower sensitivity and reproducibility than NZ and MicroTox assays. Four kinds of antifouling chemicals, Irgarol 1051, Diuron, thiabendazole (TBDZ), and N-dichlorofluoromethylthio-N ',N '-dimethyl-N-phenylsulfamide (DCF), were detected to possess delayed toxicity from the judgments on the difference of short-term and long-term toxicities. Four out of 16 seawater samples collected in Japan showed remarkable toxicity in NZ assay, suggesting that they were contaminated by several types of antifouling chemicals. Considering time consumed, facility for operation, cost, and requirements, NZ assay was proved to be efficient for toxicity evaluations for artificial and natural samples.
PHARMACEUTICAL SOC JAPAN, 2006年12月, JOURNAL OF HEALTH SCIENCE, 52 (6), 811 - 816, 英語[査読有り]
研究論文（学術雑誌）
- The impacts on marine environments by the biocides in ship antifouling paints
Biocides are added into ship paints to protect ship's hull against the settlement of fouling organisms. But these biocides, named as antifouling chemicals, may also affect the non-target organisms in marine environments. TBT was applied as antifouling, chemical for many decades but found to be extremely harmful to marine ecosystem. Therefore, it was prohibited to use by International Maritime Organization (IMO) from 2003. In this study, the toxicity of several types of antifouling chemicals against aquatic organisms was discussed. The results showed that these chemicals possess serious inhibitory activity on bacteria, micro-algae, fish, and crustacean. Further the degradation of these biocides were studied, some of them possibly possess the abilities of hydrolysis and photolysis, which may enable the reduction of their concentrations in marine environments. Since usage of antifouling chemicals will continue until suitable alternative technology is developed, the degradation ability of antifouling chemical should be considered as an important factor to be granted for application in ship paints.
JILIN SCI TECHNOL PUBL HOUSE, 2006年, Progress of Green Oxidation/Reduction Technologies, pp. 468-473, 468 - 473, 英語[査読有り]
研究論文（国際会議プロシーディングス）
dZinc pyrithione (ZnPT) or copper pyrithione (CuPT) have been effectively used as ship-antifouling agents, as an alternative to organotin compounds. Because of their instability in light and a lack of suitable analytical procedures, there is little data on their residue levels in environmental matrices. It is possible to investigate the fate of such compounds by toxicity alteration with certain treatments. The purpose of this study was to evaluate the degradation of pyrithiones through toxicity reduction by near ultraviolet (UV-A) irradiation. Metal pyrithiones dissolved in acetonitrile were irradiated with a UV-A lamp for 0, 0.5, 1, and 2 h, and were subjected to UV spectral measurement and toxicity evaluation using both sea urchin and freshwater rotifer bioassays. For the bioassays, photolyzed samples were dissolved in dimethyl sulfoxide after evaporation of the acetonitrile. The changes in UV spectra of photolyzed ZnPT or CuPT showed a time-dependent degradation, and the UV spectra at 2 h irradiation suggested substantial decomposition. Toxicities of ZnPT and CuPT were 12 and 5 mu g/L as 24 h LC50 to the survival of rotifers and 10(-6) ng/L and 2.3 ng/L as 27 h EC50 to normal pluteus formation, respectively. By evaporation of the acetonitrile, the EC50 of ZnPT was 2.2 ng/L, which was the same as that of CuPT. The EC50s of ZnPT or CuPT for both species increased with longer irradiation times. Photolyzed ZnPT or CuPT demonstrated substantial degradation in the UV spectra, but possessed marked toxicity, which is probably due to toxic degradation products. One reason why photolyzed CuPT was toxic to rotifers was explained by the high toxicity of copper ions formed by UV-A irradiation. (c) 2006 Wiley Periodicals, Inc.
JOHN WILEY & SONS INC, 2006年08月, ENVIRONMENTAL TOXICOLOGY, 21 (4), 305 - 309, 英語[査読有り]
研究論文（学術雑誌）
A bioluminescent assay using Vibrio fischeri Deutsche Sammlung von Mikroorganismen (DSM) 7151 was applied to evaluate the toxicities of some new antifouling chemicals. First, the efficient concentration, led to 50% inhibition of bioluminescence (EC50) values of the single antifouling chemicals zinc 2-pyridinethiol-1-oxide (Zn-pt), copper 2-pyridinethiol-1-oxide (Cu-pt), CuSO4, zinc bis(N,N'-dimethyl)-dithiocarbamate (Ziram), 4,5-dichloro-2-(n-octyl)-3(2H)-isothiazolone (SeaNine 211), pyridine triphenylboron (PTPB), 3-iodo-2-propynyl butylcarbamate (IPBC), 3-(3,4-dichlorophenyl)-1,1-dimethylurea (Diuron), dichlofluanid (N-dichlorofluoromthylthio-N',N'-dimethyl-N-phynylsulfamide) (DCF), and 2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine (Irgarol 1051) were determined to be 0.08, 0.12, 0.22, 0.31, 0.35, 0.75, 8.49, 12.74, 39 and > 40 mg/l at 30 min of incubation, respectively. Then, 45 different combinations composed of two antifoulants each were evaluated. Based on the EC50 values at 30 min of incubation, typical patterns of interaction for the combinations were classified into three groups based on the comparison of inhibition difference between single chemicals and their mixtures. Mixture toxicity indices were also introduced to examine the interaction effect of each combination. The results showed that most combinations were partially additive, and there was no antagonistic effect among the present combinations of chemicals. Additive effects were observed in the case of Diuron, PTPB, or SeaNine 211 when mixed with IPBC. Marked synergistic effects were observed for Irgarol 1051, Ziram, Zn-pt, and Cu-pt when mixed with Cu2+, which will make these chemicals more toxic against organisms in marine environments.
PHARMACEUTICAL SOC JAPAN, 2006年06月, JOURNAL OF HEALTH SCIENCE, 52 (3), 243 - 251, 英語[査読有り]
研究論文（学術雑誌）
Interactive toxic effects between heavy metals were investigated using a sea urchin (Anthocidaris crassispina) bioassay. An effluent from an abandoned mine showed significant inhibitory effects on embryo development as well as producing specific malformations. The effects on the embryos were reproduced by synthetic polluted seawater consisting of eight metals (manganese, lead, cadmium, nickel, zinc, chromium, iron, and copper) at the concentrations detected in the mine effluent. This indicated that the heavy metals were responsible for the effects observed. Five heavy metals were ranked in decreasing order of toxicity as follows: Cu > Zn > Pb > Fe > Mn. Among these, zinc and manganese could cause malformation of the embryos. From bioassay results using 27 combinations of heavy metals, 16 combinations including zinc could produce specific malformations, such as radialized, exo-gastrulal, and spaceship Apollo-like gastrulal embryos. Zinc was one of the elements responsible for causing malformations and its effects were intensified by the presence of the other metals, such as manganese, lead, iron, and copper. (c) 2005 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2005年12月, CHEMOSPHERE, 61 (8), 1198 - 1203, 英語[査読有り]
研究論文（学術雑誌）
- 2005年, 環境科学会誌, 18(2): 127-128., 日本語海洋環境シンポジウム2004-海生生物を用いたバイオアッセイと海洋生態系保全のあり方.
研究論文（国際会議プロシーディングス）
Triphenyltin (TPT) and tributyltin (TBT) concentrations were determined in two starfish species (Asteriapectinffra and Asterias amurensis), bivalves (Crassostrea gigas or Mytilus edulis), and seawater samples from sites around the coasts of Korea. Both TPT and TBT concentrations in starfish ranged from 8 to 1560 ng/g and from < 2 to 797 ng/g as Sri on a dry weight basis, respectively. TPT concentration accounted for 75.4% and 86.4% of total phenyltin concentration in A. pectinifera and A. amurensis, respectively, while monobutyltin, a degradation product of TBT, accounted for 86.3% and 57.2% of total butyltin, respectively. Triphenyltin concentrations in A. pectinifera were significantly correlated to water and bivalve TPT concentrations, which implies that dietary uptake of TPT from contaminated prey as well as direct uptake from surrounding water contribute to TPT body residues in the starfish. Starfish could be target organisms for monitoring TPT compound in the marine environment, due to their high accumulation and low degradation capacity towards TPT. (C) 2004 Elsevier Ltd. All rights reserved.
ELSEVIER SCI LTD, 2005年02月, ENVIRONMENTAL POLLUTION, 133 (3), 489 - 499, 英語[査読有り]
研究論文（学術雑誌）
Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine) is a herbicide analogue that is added to antifouling agents used on ships. Our former study on its degradation in sunlight suggested that unknown photosensitizers in natural waters accelerated the photodegradation to the degradation product, M1. In this study, the photodegradation of Irgarol in water was investigated in the presence of some photosensitizers. Test water containing Irgarol or M1, with or without photosensitizers, was irradiated with light from a UV-A fluorescent lamp for 48 h. The concentrations of Irgarol and M1 in the test water were determined by HPLC after solid-phase extraction. M1 was more stable than Irgarol when irradiated in the presence of photosensitizers such as acetone, benzophenone, tryptophan, and rose bengal. Hydrogen peroxide (HP) accelerated the photodegradation of Irgarol, and the product M1 was degraded in the presence of more than 100 mg l(-1) HP after 10 h. Natural humic substances (NHS) also accelerated the photodegradation of Irgarol, but in this case, the product M1 persisted even when Irgarol was completely degraded. Photosensitized degradation of Irgarol by NHS may result in the accumulation of M1 in aquatic environments. (C) 2004 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2004年11月, CHEMOSPHERE, 57 (7), 739 - 743, 英語[査読有り]
研究論文（学術雑誌）
The toxicity of the polluted waters originating from a disused lead mine was evaluated using both sea urchin bio-assays and heavy metal analysis. Samples from three polluted waters (a seawater and two freshwaters) were collected from the mine area and one seawater sample was taken from a non-contaminated reference site. The test waters contained higher concentrations of heavy metals such as manganese, lead, cadmium, zinc, chromium, nickel, iron, and copper than did ambient seawater. The three test waters had inhibitory effects, in a dose-dependent manner, on the first cleavage of sea urchin embryos and on pluteus formation during the development. Some malformations, such as a radialized pluteus, exo-gastrula, and spaceship Apollo-like embryos were induced by the test waters without dilution. Zinc alone also induced the same anomaly. Zinc in the test seawater was ascertained as one of the metals that caused the anomalies, but not all of the toxicity was caused by zinc. It was speculated that interactive effects, involving zinc and possibly manganese and nickel, were occurring. (C) 2003 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2004年06月, CHEMOSPHERE, 55 (10), 1403 - 1412, 英語[査読有り]
研究論文（学術雑誌）
Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine), a derivative of s-triazine herbicide, is an antifouling compound used as an alternative to organotins. The compound is highly persistent and is known to be biodegraded only by the white rot fungus, Phanerochaete chrysosporiunt. We used partially purified manganese peroxidase (MnP) prepared from P. chrysosporium to evaluate its capacity to degrade Irgarol 1051. MnP degraded Irgarol 1051 to two major products, one identified as M1 (identical to GS26575, 2-methylthio-4-tert-butylamino-6-amino-striazine) and the other not identified but with same mass spectrum as M1 and a different ultraviolet spectrum. This report clearly demonstrates that this ligninolytic enzyme is involved in the degradation of Irgarol 1051. (C) 2003 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2004年04月, CHEMOSPHERE, 55 (3), 487 - 491, 英語[査読有り]
研究論文（学術雑誌）
- 2004年, 用水と廃水, 46: 1031-1036, 日本語有機スズ代替防汚剤が海産動植物プランクトンに及ぼす影響評価.
[査読有り]
研究論文（学術雑誌）
- 2004年01月, Proceedings in International Symposium on Antifouling paint and Marine Environment (InSAfE), 223-227Photosensitized degradation of Irgarol 1051 in water.
[査読有り]
研究論文（国際会議プロシーディングス）
- Ecotoxicity of seawater in and out dockyards
Seawater pollution around dockyards was assessed by two kinds of standard bioassay and chemical analysis targeting new antifouling compounds. Seawater samples were collected at thirteen sites in and out dockyards in 2003. Ecotoxicity of the samples without concentration was assessed using marine microalgae Skeletonama costatum and marine crustacean Artemia salina. All the samples had no significant effects on crustacean. Four samples collected in the dock before and after repair practice with sandblast had severe toxic effects on algal growth with low 72-hour EC50s. Chemical analysis showed the toxic seawater contained three antifouling compounds such as Diuron, Irgarol 1051, and Irgarol's metabolite M1. The concentrations in the seawater were ranging 51 similar to 85 mu g/L for Diuron, 2.4 similar to 25 mu g/L for Irgarol, and 1.4 similar to 19 mu g/L for M1. It was speculated that both Diuron and Irgarol were responsible for the toxicity of seawater according to the relationship between the residue concentrations and the EC50s obtained from algal bioassay. The experimental results clearly indicated that the state-of-the-art practice at dockyard could discharge contaminants to marine environment around the dockyards. It is needed to minimize toxic discharge from dockyards.
IEEE, 2004年, OCEANS '04 MTS/IEEE TECHNO-OCEAN '04, VOLS 1- 2, CONFERENCE PROCEEDINGS, VOLS. 1-4, 1793-1796, 1793 - 1796, 英語[査読有り]
研究論文（国際会議プロシーディングス）
- SPRINGER-VERLAG, 2003年11月, BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 71 (5), 881 - 886, 英語
研究論文（学術雑誌）
Residue analyses of some antifouling herbicides (Diuron, Irgarol 1051 and the latter's degradation product M1, which is also known as GS26575), were conducted in waters collected along the coast of western Japan. In total, 142 water samples were collected from fishery harbours (99 sites), marinas (27 sites), and small ports (16 sites) around the Seto Inland Sea, the Kii Peninsula, and Lake Biwa, in August 1999. A urea-based herbicide, Diuron, was positively identified for the first time in Japanese aquatic environments. Diuron was detected in 121 samples (86%) up to a highest concentration of 3.05 mug/l, and was found in 86% of samples from fishery harbours, 89% from marinas, and 75% from ports. Four freshwater samples out of 11 collected at Lake Biwa contained Diuron. Neither Irgarol 1051 nor M1 was found in the lake waters, but both were found in many coastal waters. Irgarol 1051 was found in 84 samples (60%) at a highest concentration of 0.262 mug/l. The concentrations detected were of similar magnitude to those in our previous surveys, taken in 1997 and 1998. M1 was found in 40 samples (28%) up to a highest concentration of 0.080 mug/l. The concentrations detected were generally lower than those found in our previous surveys. The detection frequency among fishery harbours, marinas, and ports was 57-70% for Irgarol 1051 and 25-30% for M1. Ninety-five per cent of the coastal waters in which M1 was detected also contained Irgarol 1051, and 93% of the samples in which Irgarol 1051 was detected also contained Diuron. These results clearly suggest that commercial ship-bottom paints containing both Diuron and Irgarol 1051 are used extensively in the survey area. (C) 2003 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2003年, MARINE POLLUTION BULLETIN, 47 (1-6), 59 - 67, 英語研究論文（学術雑誌）
Tributyltin oxide (TBTO) has been used worldwide in marine antifouling paints as a biocide for some time. However, it produced toxic effects, especially in marine water/sediment ecosystems. Consequently, its use in antifouling paints has been prohibited in many countries. In this study, the toxicity of alternative and/or new antifouling biocides compared with TBTO is assessed by a biological method. The effects of these chemicals on marine species have not been well studied. This paper assesses, comparatively, the effects of eight biocides on sea urchin eggs and embryos. The chemicals assessed were TBTO, Irgarol 1051, M I (the persistent degradation product of Irgarol), Diuron, zinc pyrithione, 'KH101', 'Sea-Nine 211', and copper pyrithione. For these chemicals, toxicity appears to be in the order zinc pyrithione > Sea-Nine 211 > KH101 > copper pyrithione > TBTO > Diuron similar to Irgarol 1051 > M1. Here, we show that zinc pyrithione, Sea-Nine 211, KH101, and copper pyrithione are much more toxic to sea urchins than TBTO or the other chemicals. (C) 2002 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2002年08月, MARINE POLLUTION BULLETIN, 44 (8), 748 - 751, 英語[査読有り]
研究論文（学術雑誌）
The antifouling compound Irgarol 1051 and its degradation product M1 (also known as GS26575), along with another antifouling compound Diuron, have recently been found in Japanese coastal waters. This study was undertaken to find the origin of these chemicals and investigate their aquatic fate. Five glass plates, each coated with I g of antifouling paint containing Irgarol and Diuron, were submerged in 250 ml of five different test waters and the plates removed after several months. The aqueous solutions were divided into two groups: one exposed to natural sunlight, and the other kept in the dark as a control. Irgarol and Diuron were detected in all aqueous solutions, suggesting leaching from antifouling paints is the origin of these antifouling biocides found in Japanese coastal waters. Under sunlight conditions, Irgarol underwent a rapid degradation to produce M1, which remained even after Irgarol had disappeared from the system. These compounds were persistent in any aqueous solutions tested under dark conditions, indicating high stability to hydrolysis. Diuron and M I were more persistent than Irgarol under sunlight irradiation. Since these compounds have high herbicidal activities, their ultimate impact on aquatic ecosystems is closely related to their aquatic fate. (C) 2002 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2002年07月, CHEMOSPHERE, 48 (1), 43 - 50, 英語[査読有り]
研究論文（学術雑誌）
A simple, rapid toxicity test was developed using the suspension-cultured fish cell line CHSE-sp derived from chinook salmon Oncorhynchus tshawytscha embryos in order to assess the toxicity of new marine antifouling compounds. The compounds tested were copper pyrithione, Diuron, Irgarol 1051, KH101, Sea-Nine 211, and zinc pyrithione, all of which have been nominated in Japan as possible replacements for organotin compounds. The in vitro acute toxicity (24h EC50) of the six compounds to these fish cells was evaluated using the dye Alamar Blue(TM) to determine cell viability, and then correlated with the results of in vivo chronic toxicities (28-day LC50) to juvenile rainbow trout Oncorhynchus mykiss. The suspension-cultured fish cells were found to be suitable for the screening of such chemicals before performing an in vivo test. The toxicities of the test compounds obtained from both tests, shown in decreasing order, were as follows: copper pyrithione > zinc pyrithione > KH101 > Sea-Nine 211 greater than or equal to Diuron > Irgarol 1051. The herbicides Diuron and Irgarol 1051 showed the least toxicity, while the pyrithiones had the greatest toxicity. (C) 2002 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2002年02月, CHEMOSPHERE, 46 (7), 945 - 951, 英語[査読有り]
研究論文（学術雑誌）
An ecotoxicological Study of river water discharged from the agricultural area around Lake Biwa was performed by using algal bioassays to guide chemical analysis. Water samples were collected once a week, at least, for 1 year starting in April 1997 and continuing, until April 1998. The toxicities of the dissolved and particulate-adsorbed extracts of water samples were evaluated by the algal growth inhibition test and concentrations of individual pesticides were determined. Most of the river water that was collected during the periods when pesticides were applied to the paddy fields caused algal growth inhibition. Some extracts were found to contain herbicides (molinate, mefenacet, simetryn, or esprocarb) as major compounds. According to chemical assay and bioassay, simetryn was identified as the most toxic compound that caused algal growth inhibition. (C) 2002 Elsevier Science Ltd. All rights reserved.
ELSEVIER SCI LTD, 2002年, ENVIRONMENTAL POLLUTION, 117 (3), 411 - 419, 英語[査読有り]
研究論文（学術雑誌）
- 2001年11月, Proceedings in 9th International Conference on the Conservation and Management of Lakes. Ohtsu, Japan.Ecotoxicological assessment of agricultural land runoff around Lake Biwa, Japan.
[査読有り]
研究論文（国際会議プロシーディングス）
- 2001年, 環境毒性学会誌, 4 (1), 19 - 28, 日本語
[査読有り]
研究論文（学術雑誌）
- 2001年, Proceedings in International symposium on Bioresources and Environmental Stress., 17-20Pesticides in the aquatic environment- Fate, ecotoxicity, and risk assessment.
[査読有り]
研究論文（国際会議プロシーディングス）
Microbial degradation is one of the most important processes responsible for the removal of chemical contaminants from the environment. Since the aquatic compartment is frequently the ultimate depository for many man-made substances, there is a need to understand factors that control and/or affect the rate of biodegradation for chemical substances in the aquatic environment. In this study, several priority chemicals encompassing various biocides (2,4-dichlorophenoxy acetic acid, carbaryl, fenitrothion, pentachlorophenol) and a nitroaromatic (2,4-dinitrotoluene were assessed for their biodegradability in cyclone fermenters under aerobic and anaerobic conditions, with and without co-metabolites. Among those factors investigated, aerobic and anaerobic conditions, availability of co-metabolites, and pre-exposure of microorganisms to the test chemical were found to be the most significant elements in controlling the rate of biodegradation. Other factors (e.g., acclimation period) requiring attention in calculating the rate of biodegradation were also discussed. (C) 2000 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 2000年12月, ENVIRONMENTAL TOXICOLOGY, 15 (5), 476 - 483, 英語[査読有り]
研究論文（学術雑誌）
Residue analyses and ecotoxicity assessment were conducted on the new antifouling compound Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine) and its degradation product M1 (2-methylthio-4-tert-butylamino-6-amino-s-triazine) in order to delineate the environmental fate and impact of Irgarol 1051 on the aquatic ecosystem. For the first time, the Irgarol degradation product (M1) was positively identified in environmental samples. During the 1998 Irgarol survey, concentrations of M1 (up to 1870 ng/l) were generally higher than those of Irgarol in the coastal waters of the Seto Inland Sea in Japan, suggesting a greater environmental persistence for M1 than for the parent compound Irgarol 1051 in the aquatic ecosystem. Ecotoxicity testing revealed that Irgarol 1051 and M1 were moderately toxic to a marine bacterium and the four crustaceans tested, but were highly toxic to some algae and higher plants. In the root elongation inhibition bioassay, M1 showed a phytotoxicity at least 10 times greater than that of Irgarol and six other triazine herbicides (terbutryn, terbutylazine, terbumeton, simetryn, atrazine and simazine). These results strongly suggest that both Irgarol 1051 and its persistent degradation product M1 may potentially affect and/or damage the primary producer community in aquatic ecosystems. To safeguard the aquatic ecosystem from the damaging impact of micro contaminants, it is recommended that, besides monitoring for the target parent compound, major degradation products should also be included in environmental surveys. Otherwise, then is a risk of underestimating the ultimate impact of a particular toxicant on the environment. (C) 2000 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2000年10月, WATER RESEARCH, 34 (14), 3523 - 3530, 英語[査読有り]
研究論文（学術雑誌）
The phytotoxicity of the new antifouling compound Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cycloamino-s-triazine) and its degradation product M1 (2-methylthio-3-tert-butylamino-6-amino-s-triazine) was assessed by a battery of bioassays with marine and freshwater species, Both compounds at low concentrations affected aquatic plant species such as the red macroalga Porphyra yezoensis conchospores, the brown macroalga Eisenia bicyclis gametophytes, the freshwater green microalga Closterium ehrenbergii, the floating macrophytes Lemna gibba G3 and Lemna minor 1769, The toxicity of Irgarol 1051 was higher than that of M1 for all the aquatic plant species tested, but MI showed a higher toxicity to root elongation of a terrestrial plant. The NOEC (0.3 mu g/l) of Irgarol to the brown seaweed was identical to the maximum concentration (0.296 mu g/l) detected in Japanese coastal waters, and the maximum concentration of M1 (1.87 mu g/l) detected amounted to only 20% of the NOEC value. The bioassay results suggest the possibility that both Irgarol 1051 and M1 may influence the primary producer community in the aquatic environment, (C) 2000 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 2000年09月, MARINE POLLUTION BULLETIN, 40 (9), 754 - 763, 英語[査読有り]
研究論文（学術雑誌）
- Photodegradation of Irgarol 1051 in water
The photodegradation of a novel antifouling agent with high algicidal activity, Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine), has been investigated. Irgarol 1051 is fairly stable toward hydrolysis in water, and has been detected in European coastal and lake waters since its introduction in the late 1980's. Irgarol 1051 dissolved in six different aqueous solutions was exposed to solar irradiation for 6 months. Its rates of photodegradation in natural sea water and river water were much higher than those in pure water and buffered solutions (pH 5, 7, and 9). It appears that unknown photosensitizers in the natural waters accelerated the photodegradation of Irgarol 1051. Three significant photodegradation products ("RT5.8", "RT7.8", and "RT8.7") were observed. The degradation product RT7.8 was produced just in the natural waters and persisted for only several weeks. The other two degradation products (RT5.8 and RT8.7) were much more stable, even after 6 months irradiation. The latter (RT8.7) was produced mainly in buffer solutions, and the former (RT5.8) was produced in all the 6 aqueous solutions tested and was identified by GC-MS analysis as the compound 2-methylthio-4-tert-butylamino-6-amino-s-triazine, which had been found as a biodegradation product during the fungal biotransformation of Irgarol 1051. Thus biodegradation and photodegradation processes in natural waters both have the same major degradation product.
MARCEL DEKKER INC, 1999年, JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 34 (2), 225 - 238, 英語[査読有り]
研究論文（学術雑誌）
Irgarol 1051, 2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine, is a newly developed herbicidal additive for use in copper-based antifouling paints. It is intended to replace the antifouling agent tributyltin, which has been regulated internationally due to its severe impact on the aquatic ecosystem. However, there is no information in the open literature on the abiotic degradation of Irgarol, a fact that hinders the assessment of its ultimate impact on the environment. This study showed that mercuric chloride was capable of rapidly catalyzing the hydrolysis of Irgarol 1051 in distilled water and buffer solutions. The degradation appeared to follow the reaction of a catalyzed hydrolysis and was not significantly affected by the pH tested (5 to 9). All other 5 heavy metal salts tested (AgNO3, CdCl2, CuSO4, PbCl2 and ZnCl2) had practically no catalytic property on Irgarol hydrolysis, implying the involvement of a specific activity for Hg2+ in this reaction. The mechanism for the catalyzed hydrolysis may be the formation of bidentate chelation through nitrogen: (No. 5) on the ring and the nitrogen on the cyclopropyl-amino side chain in Irgarol 1051 with the Hg2+ ion. The resulting four member chelate complex would weaken the cyclopropyl-amino bond considerably, thus facilitating the hydrolysis reaction. Ultraviolet spectroscopy of the reaction mixtures and the identification of Irgarol hydrolysis product M1 (2-methylthio-4-tert-butylamino-6-amino-s-triazine) by GC-MS and LC-MS provided the basis for the proposed mechanism on the HgCl2-catalyzed hydrolysis of Irgarol 1051. M1 appeared to be more stable than the parent compound Irgarol 1051, thus implying its possible accumulation in the environment. One practical aspect of this work is that HgCl2 should not be used in preserving water samples in Irgarol 1051 monitoring programs. (C) 1998 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 1999年01月, WATER RESEARCH, 33 (1), 155 - 163, 英語[査読有り]
研究論文（学術雑誌）
The effect of agricultural land run-off on the water quality of Lake Kojima, Japan, was investigated using a short-term bioassay-guided chemical analysis. Water samples were collected for 1 year starting from June 1995 to June 1996. Toxicity of the dissolved and adsorbed extracts in the water samples was evaluated using the Daphnia immobilization test and the concentrations of pesticides and putative toxic substance in the extracts were determined by high performance liquid chromatography. Most of the dissolved extracts caused immobilization of the test Daphnia magna at low concentrations during the period of paddy pesticide application. Some extracts were found to contain pesticides such as dymron, mefenacet and flutolanil, but their concentrations were too low to have a toxic effect on the daphnia. An unknown toxic compound, Peak C, was isolated from some river water samples, but it produced only a relatively weak toxicity to Daphnia. To better understand the impact of agricultural run-off on a receiving water body, the relationship between the observed toxicity and the concentrations of pesticides and Peak C in the water samples was studied both temporally and spatially. Copyright (C) 1999 Elsevier Science B.V.
1999年08月30日, Science of the Total Environment, 234 (1-3), 223 - 231, 英語[査読有り]
研究論文（学術雑誌）
The green fluorescent protein (encoded by gfp gene) was used as a marker to estimate survival of a phenanthrene-degrading Pseudomonas sp, UG14Gr in a creosote-contaminated soil from Alberta, Canada, The gfp was integrated via Tn5 transposition into the chromosome of UG14r and resultant gfp-marked colonies were identified by green fluorescence emission under UV light. The gfp was stably maintained in UG14Gr and the gfp insertion had no apparent adverse effect on the metabolic capability of the marked isolate, which showed unhindered ability to mineralize C-14-labelled phenanthrene. Colony forming units were used to monitor parent strain UG14r and gfp-marked UG14Gr in creosote-contaminated soil at 22 degrees C. Green fluorescence in the gfp-marked colonies allowed detection of UG14Gr, on antibiotic-amended and non-amended Trypticase soy agar (TSA), up to 13 months after inoculation into soil while the parent UG14r strain could be detected, on TSA amended with rifampicin, for only up to 25 days after inoculation into soil. Our studies indicated that the gfp marker can be used for survival studies of marked bacterial cells in contaminated soil. When the gfp-marked UG14Gr strain was co-inoculated with a lux-lac-marked Pseudomonas aeruginosa UG2Lr strain, both strains were unambiguously detected by their respective markers. Comparison of the effect of water holding capacity (WHC) of soil on [C-14]phenanthrene mineralization showed that mineralization proceeded faster in treatments at 60% WHC than at 85% WHC, Nitrogen amendment in soils had no effect on [C-14]phenanthrene mineralization at 60% WHC while treatments at 85% WHC showed higher mineralization in unamended soils than in N-amended soils. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 1998年07月, FEMS MICROBIOLOGY ECOLOGY, 26 (3), 181 - 191, 英語[査読有り]
研究論文（学術雑誌）
We simulated the formation of halogenated by-products of biodegradation products of a nonionic surfactant, nonylphenol ethoxylate (NPE), and evaluated the toxicity of these by-products. Most NPE derivatives bearing shortened ethylene oxide (EO) chains (abbreviated as NPnEO) and nonylphenol carboxylate (NPnEC) disappeared within 24 h. In both NPnEO and NPnEC, benzene rings are substituted by monobromine. In contrast, chlorine-substituted derivatives were scarcely detected. However, the stoichiometrical bromination of NPnEO and NPnEC was not found. Total amounts of NPnEO, NPnEC, and their bromine-substituted products (BrNPnEO and BrNPnEC, respectively) tended to diminish with increasing level of residual chlorine concentration. Hence, it was suggested that both NPnEO and NPnEC were transformed to unknown by-products. The optimum pH for the formation of both BrNPnEO and BrNPnEC was approximately 7, and these formations decreased remarkably at higher pH. The formation of both BrNPnEO and BrNPnEC was shown to be dependent on the bromide anion concentration but independent of the level of residual chlorine. In the umu assay, a mutagenicity test that uses genetically engineered Salmonella bacteria, neither BrNPnEO nor BrNPnEC showed significant mutagenicity irrespective of metabolic activation by S9-mix. However, both BrNPnEO and BrNPnEC showed higher acute toxicity to Daphnia magna than their nonbrominated precursors, NPnEO and NPnEC. The toxicity of BrNPnEO to Daphnia was higher than that of BrNPnEC.
SETAC PRESS, 1998年04月, ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY, 17 (4), 650 - 654, 英語[査読有り]
研究論文（学術雑誌）
- 1998年, 水環境学会誌, 21 (4), 244 - 249, 日本語
[査読有り]
研究論文（学術雑誌）
A laboratory experiment was performed to study the role of microorganisms in producing the non-extractable residues by anaerobically incubating cyanazine (2-[[4-chloro-6-(ethylamino)-1,3,5,-triazin-2-yl]-amino]-2-methoxy-1-methylethyl)acetamide] and metolachlor [2-chloro-N-(2-ethyl-6-methoxy-1-methylethyl)acetamide] in culture media that had been inoculated with sewage bacteria from anaerobic sludge. Based on the gas chromatographic analyses of extracts from the degradation, adsorption, and abiotic controls for the parent herbicide and its possible metabolites, this study provided the first direct evidence that bacterial biomass, rather than metabolism, was mainly involved in the formation of bound residues with cyanazine. Anaerobic bacteria appeared to be incapable of forming bound residues with metolachlor. The common phenomenon of age-dependent extractability for bound residues was observed with cyanazine. These results imply that bacteria may adsorb pesticides selectively with preference for certain chemical structures over others.
TAYLOR & FRANCIS INC, 1998年, JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES, 33 (1), 1 - 15, 英語[査読有り]
研究論文（学術雑誌）
Irgarol 1051, 2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine, is a newly developed herbicidal additive for use in copper-based antifouling paints. It is intended to replace the antifouling agent tributyltin, which has been regulated internationally due to its severe impact on the aquatic ecosystem. However, there is no information in the open literature on the persistence and degradation of Irgarol, a fact that hinders the assessment of its ultimate impact on the environment. This study showed that the white rot fungus Phanerochaete chrysosporium was capable of biotransforming Irgarol 1051. It appears that the metabolism of Irgarol by the fungus proceeds mainly via partial N-dealkylation. Metabolic dealkylation occurs at the cyclopropylamino group resulting in metabolite M1, which has tentatively been identified as 2-methylthio-4-tert-butylamino-6-amino-s-triazine. M1 appeared to be a stable and/or terminal metabolite. No evidence of the heterocyclic ring cleavage of Irgarol 1051 was observed, thus implying a possibility of its degradation product(s) accumulating in the environment. (C) 1997 Elsevier Science Ltd.
PERGAMON-ELSEVIER SCIENCE LTD, 1997年09月, WATER RESEARCH, 31 (9), 2363 - 2369, 英語[査読有り]
研究論文（学術雑誌）
- JOHN WILEY & SONS INC, 1997年02月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 12 (1), 97 - 100, 英語
[査読有り]
研究論文（学術雑誌）
Organic solvents are commonly used in many sediment toxicity bioassays to facilitate the extraction and concentration of adsorbed contaminants from sediment samples. However, the inherent biotoxicity of most solvents to the bioassay organism may complicate greatly the interpretation of the toxicity test results. To alleviate this problem, a solvent-less extraction procedure was developed for use in the assessment of sediment toxicity. Basically, it involves the use of sonication and sodium ligninsulfonate to enhance the release of the adsorbed contaminants from the sediment. The procedure was applied to sediment samples collected from the St. Clair River at a site approximately 25 m offshore of Dow Chemicals (Sarnia, Ontario). Test results indicate that the most toxic components of the St. Clair River system near Dow Chemicals were associated mainly with the sediment fraction, and there appeared to be very little or no biotoxicity in the overlaying water column. Several of the major contaminants were identified as chlorinated hydrocarbons. The impact of these chemicals on the aquatic environment is discussed. (C) 1996 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1996年08月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 11 (3), 195 - 203, 英語[査読有り]
研究論文（学術雑誌）
To reduce the impact of chemical substances on the aquatic ecosystem, it is essential to understand their ecotoxicological properties in the natural aquatic environment. Consequently, we conducted an ecotoxicological study on the aquatic environment around Lake Kojima, a man-made lake located in the southwest of Japan. Lake Kojima receives its chemical inputs mainly from two rivers that flow through various agricultural and industrial areas. For ecotoxicity screening, surface water and sediment samples were collected 4 times in 1993 from 16 preselected sites, Then, the solutes in the filtered surface water were concentrated by ODS resin, and the organic chemicals in the suspended solids (SS) and sediments were extracted by acetone. A battery of five ecotoxicity tests (agar plate test using bacteria and yeast, algal growth inhibition test, Daphnia magna immobilization test, and root elongation test using lettuce seeds) was used to assess these extracts. The results show that the surface water extracts had a lethal effect on D. magna, the SS extracts suppressed algal growth, and the sediment extracts were inhibitory to the growth of yeast. A significant inhibitory effect by the sediment extracts from 4 lake sites and 3 river sites was detected by these ecotoxicity tests. Attempts also were made to identify the putative ecotoxic chemicals in the collected samples. Elementary sulfur was identified as one of the major toxicants in the sediment extracts that were inhibitory to the yeast growth. Moreover, samples of surface water around Lake Kojima, collected weekly from June to September in 1994, were found to contain three pesticides and were toxic to D. magna, But the concentration of the pesticides detected was too low to cause daphnia immobilization. It is believed that the toxicity of the water extracts was mainly due to the combined toxic effect of natural and man-made components. (C) 1996 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1996年08月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 11 (3), 213 - 221, 英語[査読有り]
研究論文（学術雑誌）
Cyanazine (2-[[4-chloro-6-(ethylamino)-1,3,5,-triazin-2-yl]-amino]-2-methylpropanenitrile) is an important selective herbicide used for the control of several annual grassy weeds and certain broad-leafed weeds in fields of corn, soybeans, and triazine-resistant canola. It is one of the most heavily used agricultural herbicides in Ontario. There is, however, very little information in the open literature on the aquatic fate and persistence of cyanazine, a fact that hinders the assessment of its ultimate impact on the aquatic ecosystem. This research showed that cyanazine was very stable in natural surface runoff and soil leachate. It was also very resistant to microbial degradation in water under both aerobic and anaerobic conditions. No apparent biodegradation or biotransformation of cyanazine was observed in a test using mixed cocktails of farmland runoff and soil leachate after an incubation period of 98 days. Its biological persistence was further demonstrated by a cyclone fermenter study in which cyanazine was found to be totally immune to the biodegradation potential of a polynuclear aromatic hydrocarbon degrading bacterial culture and sewage microorganisms after an incubation period of 110-195 days. Using the herbicide metolachlor as a biodegradability reference compound and the white rot fungus Phanerochaete chrysosporium as the test organism, cyanazine was estimated to have a persistence in water much greater than that of metolachlor. Thus, the extensive herbicidal use of cyanazine may have a long-lasting impact on Canadian aquatic ecosystems. (C) 1996 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1996年02月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 11 (1), 27 - 36, 英語[査読有り]
研究論文（学術雑誌）
Metolachlor is an important selective herbicide used for the control of several annual grassy weeds and certain broad-leafed weeds in corn, soybean, peanut, and other crops. It is the most heavily used agricultural pesticide in Ontario. There is, however, very little information in the open literature on the aquatic fate and persistence of metolachlor, a fact that hinders the assessment of its ultimate impact on the aquatic ecosystem. This study showed that metolachlor was very stable in natural water systems. No apparent biodegradation or biotransformation of metolachlor was observed in three test lake waters after an incubation period of 170 days. With a polynuclear aromatic hydrocarbon (PAH) degrading bacterial culture as the test organism, metolachlor was estimated to have an environmental persistence much greater than medium molecular weight PAHs. Thus the extensive herbicidal use of metolachlor may have a long-lasting impact on Canadian aquatic ecosystems. The white rot fungus Phanerochaete chrysosporium was able to biotransform metolachlor. Based on the three identified metabolites, a tentative metabolic pathway of metolachlor biotransformation by P. chrysosporium was proposed, involving demethylation, hydroxylation, and hydrolytic dechlorination. (C) 1995 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1995年11月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 10 (4), 249 - 258, 英語[査読有り]
研究論文（学術雑誌）
- 1995年, Proceeding of 6th International Conference on the Conservation and Management of Lakes -Kasumgaura '95, 1195-1198Ecotoxicity assessment of agricultural effluent and surface water during the application of paddy pesticides.
[査読有り]
研究論文（国際会議プロシーディングス）
Assessing the interactive toxic effect of chemicals in the environment is becoming a matter of increasing public focus on and concern with ecotoxicological aspects. The purpose of this study is to find the relationship between an interactive toxic effect and distribution of heavy metals in algal cells. The green alga Chlorella ellipsoidea Gernec(IAMC-27) was cultured for 6 days in the presence of cadmium and/or chromium. Algal cells were divided into 4 fractions by centrifugation after the cells were disrupted using a French press. The amounts of the metals in each fraction were determined. The interaction effect between the two metals on algal growth was investigated. The amount of one metal taken up in the cells and the growth inhibition rate increased with the concentration of metals in the medium. The amount of one metal in the cells was increased due to the presence of the other metal. Accordingly, the growth inhibition rate also increased. The amounts of Cd accumulated in the soluble fraction and in the membrane fraction of algal cells were 50 and 20%, respectively, of the total amount in the cells. The presence of Cr changed the Cd concentration in both fractions to 40%. The amount of Cr accumulated in each fraction was almost the same in the absence of Cd. The amount of Cr accumulated in the cell wall fraction rose to 90% after 3 days of exposure and it stayed as high as 50% even at the end of the six-day study period in the presence of Cd. It was assumed that the presence of one metal influenced the distribution of the other metal in the cells, which resulted in the synergistic toxic effect. (C), 1994 by John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1994年02月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 9 (1), 7 - 15, 英語[査読有り]
研究論文（学術雑誌）
Numerous studies have been conducted on the effects of toxic chemicals using algal batch culture. On the other hand, continuous culture research has the advantage of allowing optimal cell growth. Few studies on the interactive toxic effect between chemicals have been carried out either with batch culture or with continuous culture. The purpose of this study is to find the relationship between interactive toxic effects and the bioconcentration of heavy metals using continuous algal culture. The green alga Chlorella ellipsoidea was used as a test organism. As test substances cadmium and chromium were used. The amount of heavy metals both in algae and in the medium was determined after the cells had been exposed to heavy metals for 10 days. The amount of Cd taken up in the cells and the growth inhibition rates caused by Cd increased as the concentration of Cd in the medium became higher. The inhibition rates rose drastically but the amount of Cd in the cells remained at almost the same level even if Cr was added. The bioconcentration factors of Cd were ca. 10,000 in all the cases tested, regardless of the presence of Cr. The amount of Cr in the cell exposed to Cr was low, while that amount and the growth inhibition rates for all the concentrations tested increased when Cd was added to the medium containing Cr. The bioconcentration factors of Cr reached 156,000 as the concentration of Cd in the medium increased. It seems that the toxicity of Cr was enhanced because the presence of Cd in the medium raised the amount of Cr in the cell. (C) 1993 John Wiley & Sons, Inc.
JOHN WILEY & SONS INC, 1993年08月, ENVIRONMENTAL TOXICOLOGY AND WATER QUALITY, 8 (3), 255 - 269, 英語[査読有り]
研究論文（学術雑誌）
Antioxidant activity of an extract from Eucalyptus rostrata was the highest among 16 Eucalyptus species tested. From the leaves of Eucalyptus rostrata nine active compounds were isolated: 1,2,6-tri-O-galloyl-beta-D-glucose and tellimagrandin 1 as tannins; spiraeoside, hyperoside, isoquercitrin, and myricetin 3-O-alpha-L-arabinopyranoside as flavonol glycosides; quercetin 3-O-alpha-arabinopyranoside-2''-gallate, kaempferol 3-O-a-arabinopyranoside-2''-gallate, quercetin 4'-O-beta-D-glucopyranoside-6''-gallate as acylated flavonol glycosides. Antioxidant activity of the tannins and acylated flavonol glycosides, all with galloyl groups, was much higher than that of a synthetic antioxidant. Two of the compounds, spiraeoside and quercetin 4'-glucosylgallate, showed high superoxide dismutase activity.
PERGAMON-ELSEVIER SCIENCE LTD, 1993年06月, PHYTOCHEMISTRY, 33 (3), 557 - 561, 英語[査読有り]
研究論文（学術雑誌）
From the leaves of Eucalyptus rostrata, two new acylated flavonol glycosides were isolated together with quercetin 3-0-alpha-arabinopyranoside-2''-gallate and quercetin 4'-O-beta-D-glucopyranoside. The structures of the new compounds were identified as quercetin 4'-O-beta-D-glucopyranoside-6''-gallate and kaempferol 3-O-alpha-arabinopyranoside-2''-gallate.
PERGAMON-ELSEVIER SCIENCE LTD, 1993年05月, PHYTOCHEMISTRY, 33 (2), 512 - 514, 英語[査読有り]
研究論文（学術雑誌）
The hazardous chemicals that have been released into the aquatic environment may disturb the balance of the aquatic ecosystem. Chemicals do not exist in single pure form, but occur in mixtures in the environment. Consequently, their effects on organisms living in the aquatic environment are primarily due to the combined toxicities. In this study, the interaction effects between chemicals such as copper, cadmium, chromium and pentachlorophenol on the growth of green algae Chlorella ellipsoidea, were investigated using a batch culture. Growth rate was a more sensitive index than standing crop at a given time for detecting the toxicity of chemicals. The EC50 values obtained from dry weight, were higher than those obtained from ATP, chlorophyll‐a, chlorophyll‐b, carotenoid as growth indices for algal density. The toxicity of each chemical was dependent on the test period. The inhibition rate of PCP and Cu in comparison with the control for the exposure time of 24 hours was higher than that for the exposure time of 48 hours. The inhibition rate of Cr and Cd for 48 hours was higher than that for 24 hours. The toxic intensity of chemicals was, in order, PCP, Cu, and Cr, without exception. The toxicity of Cd was changeable depending upon the indices used. The method modified by Stratton (1983) and the isobologram method were used to determine the modes of interaction effects of the chemical combinations. These two methods led to the same results, with three exceptions. A synergistic effect was observed for combinations between Cr and PCP, between Cu and Cd, and between Cu and Cr while an antagonistic effect was observed for combinations between Cd and PCP, between Cu and PCP, and between Cd and Cr within some concentration ranges. Copyright © 1987 Wiley Subscription Services, Inc., A Wiley Company
1987年, Toxicity Assessment, 2 (3), 341 - 355, 英語[査読有り]
研究論文（学術雑誌）
Phosphorous monitoring is important for eutrophication control in aquatic ecosystems, but ultratrace level concentrations may not be detected by conventional analytical methods. A method for measuring ultratrace level phosphate by online solid-phase extraction combined with HPLC was developed. A short column (50 mm) packed with octadecylsilane (ODS) was used for extraction of phosphoantimonylmolybdenum blue and dodecyltrimethylammonium hydrophobic ion-pair complexes. The ion-pair complexes entrapped on the ODS column were eluted with CH3CN/H2O (35/65; flow rate, 1.0 ml min(-1)) and monitored by an ultraviolet/visible spectrophotometer (lambda = 872 nm). Phosphate concentration was determined from the peak area of the ion pair. The limit of detection for orthophosphate was 0.15 mu g PO4 l(-1) and the dynamic range was 0.15-100 mu g PO4 l(-1). Although our method was susceptible to silicate interference, it could be corrected by a proposed interference correction equation. (C) 2014 Elsevier B. V. All rights reserved.
ELSEVIER SCIENCE BV, 2014年07月, CHEMICAL GEOLOGY, 380, 41 - 47, 英語[査読有り]
研究論文（学術雑誌）
The concentration of phosphate in surface and oligotrophic waters is sometimes below the detection limit of conventional analytical methods. In this work, a membrane extraction method using a hydrophilic PTFE (H-PTFE) membrane filter was developed to detect trace level phosphate. Phosphoantimonyl-molybdenum blue (PAMB) was prepared under conventional conditions. The PAMB was made to react with hexadecyltrimethyl ammonium (HTMA) ions by ultrasonication in an ice bath to form an ion pair of PAMB and HTMA. The ion pair was entrapped on a H-PTFE filter by filtration, and the ion pair on the filter was extracted with CH3CN. When 10 mL of CH3CN was used as the extraction solvent for 100 mL of water sample (10 times of concentration factor), 0.80 mu g PO4 L-1 (0.26 mu g P L-1) was successfully detected using a conventional spectrophotometer equipped with a 5 cm cell. The total phosphorus could also be detected after oxidation with potassium peroxosulfate.
ROYAL SOC CHEMISTRY, 2015年, ANALYTICAL METHODS, 7 (21), 9268 - 9273, 英語[査読有り]
研究論文（学術雑誌）
- Toxicity testing in Japan and the use of Toxkit microbiotests
Management of toxic chemicals in the aquatic environment is performed in Japan by setting environmental standards by law. Forty-nine chemicals are regulated and measured once a month at specific sites in rivers and lakes. Many of these chemicals are detected at various places in Japan, but in concentrations below the standard values. Dioxins, which are not regulated, have been detected in leachates from a landfill area of industrial wastes and also in human mother milk. In Japan, bioassays are not used to date as a monitoring tool. However, a manual of ecotoxicological test methods for chemicals is presently under examination by the Ministry of international Trade Industry, the Ministry of Agriculture, Forestry and Fisheries and the Environmental Agency. In most cases, the methods proposed are in accordance with OECD Guidelines for the testing of chemicals; they comprise algal, Daphnia and fish tests. Many toxicity test methods have already been described in Japanese scientific literature, based on various types of test organisms from different phylogenetic groups such as e.g. bacteria, yeasts, protozoans, micro- and macro-algae, crustaceans, molluscs, insects, amphibians, fish and birds. Taking into account the difficulties associated with the culturing and/or maintenance of live stocks, the "culture free" Toxkit microbiotest technology appeared appealing to the authors and is now used for environmental monitoring purposes in their laboratory. A new toxicity testing method using mobility analysis of Daphnias obtained from ephippia has recently been developed and will be reported. The test criterion is the change in mobility of Daphnia neonates, which is measured by computer analysis of videocamera-pictures (0.013 sec) during 5 seconds. The mobility per time unit is calculated subsequently. Toxicity is evaluated by comparing the change in mobility of Daphnias exposed to chemicals, versus that in the controls. The technology allows to detect the increase in mobility by stimulus at low concentration and the decrease at higher concentrations of toxicants. The method has a high sensitivity and allows for toxicity detection in less than 3 hours. Results with the new mobility analysis method with Daphnia neonates will be compared with those obtained with the conventional Daphnia method prescribed by the OECD.
KLUWER ACADEMIC/PLENUM PUBL, 2000年, NEW MICROBIOTESTS FOR ROUTINE TOXICITY SCREENING AND BIOMONITORING, 123 - 133, 英語[査読有り]
研究論文（国際会議プロシーディングス）
- PESTICIDE SCI SOC JAPAN, 1998年, JOURNAL OF PESTICIDE SCIENCE, 23 (2), 166 - 173, 日本語Toxicity assessment of water environment using biomonitoring
[査読有り]
研究論文（学術雑誌）
- Development of Simultaneous Determination Method of Hydroxylated Polycyclic Aromatic Hydrocarbons in Urine by LC/MS/MS and Its Application to Assessment of Polycyclic Aromatic Hydrocarbons Exposure
Polycyclic aromatic hydrocarbons (PAHs) are a group of chemicals released into the air during the incomplete burning of fossil fuels, such as gasoline and other organic substances. Some PAHs are reasonably anticipated to be human carcinogens. In this study, a high-performance liquid chromatography-tandem mass-spectrometry method has been developed for the simultaneous quantification of eight urinary OH-PAHs, including 1-hydroxynaphthalene (1-OH-Nap), 2-hydroxynaphthalene (2-OH-Nap), 1-hydroxyphenanthrene (1-OH-Phe), 2-hydroxyphenanthrene (2-OH-Phe), 3-hydroxyphenanthrene (3-OH-Phe), 4-hydroxyphenanthrene (4-OH-Phe), 9-hydroxyphenanthrene (9-OH-Phe) and 1-hydroxypyrene (1-OH-Pyr) in human urine. Deuterated 3-OH-Phe-d(9) and 1-OH-Pyr-d(9) were used for quantification of the analyte as an internal standard. Considerable amounts of PAHs are present in the workplace. PAHs exposure is reported to exist high in coke plants, aluminium work and paving work. In order to assess the potential health risks posed by exhaust gas from ships, and to obtain a better understanding of the occupational hazards connected with PAHs exposure, the concentration of OH-PAHs in urine collected from mariners has been analyzed. This method was applied to the analysis of OH-PAHs in 29 urine specimens collected from the crews on a ship. The median concentrations of urinary 1-OH-Nap, 2-OH-Nap, 1-/9-OH-Phe, 2-OH-Phe, 3-OH-Phe, 4-OH-Phe and 1-OH-Pyr were 0.36, 0.57, 0.12, 0.07, 0.14, 0.07 and 0.11 mu g/g creatinine in the crews, respectively. The developed method was applied to occupational exposure to urine in order to assess human exposure due to the working environment.
JAPAN SOC ANALYTICAL CHEMISTRY, 2012年11月, BUNSEKI KAGAKU, 61 (11), 925 - 930, 日本語[査読有り]
研究論文（学術雑誌）
- Survey for the occurrence of the new antifouling compound Irgarol 1051 in the aquatic environment
Irgarol 1051, (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine), is a newly developed herbicidal additive for use in copper-based antifouling paints. It is intended as replacement for the highly toxic antifouling agent tributyltin, which has been regulated internationally. Currently, there is no information in the open literature on its environmental occurrence outside Europe. A two-year survey was conducted in 1996-1997 to investigate the occurrence of Irgarol 1051 in Canadian and Japanese aquatic environments. Six large trade ports (Vancouver, Toronto, Montreal, Halifax, Mizushima and Kobe), 73 marinas and 13 fishery harbors were surveyed. Irgarol 1051 was not detected in the Canadian aquatic environment, but was positively identified in the enclosed coastal waters of the Sere Inland Sea in Japan. Among the six trade ports surveyed, only the Mizushima Port had low levels of Irgarol 1051, up to 19.5 ng/L. Approximately 27% of the marinas surveyed in the Seto Inland Sea were found to have been contaminated by Irgarol 1051, ranging in concentration between 12.5 and 264.2 ng/ L. Irgarol 1051 was found more frequently in fishery harbors than in marinas, indicating that besides marinas and trade ports, fishery harbors can also be a significant source of contamination for the aquatic environment. Survey for Irgarol 1051 in the fishery harbors has not been reported before, and it is suggested that fishery harbors, in addition to ports and marinas, should be included in the survey list during the Irgarol 1051 monitoring study. Irgarol 1051 has been reported to be highly toxic to nontarget marine algae with the observable growth inhibition at a concentration as low as 50 ng/L, which is well within the ambient concentration levels found in some localities of the Seto Inland Sea. (C) 1999 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 1999年08月, WATER RESEARCH, 33 (12), 2833 - 2843, 英語[査読有り]
研究論文（学術雑誌）
- 2019年, Advancements in Bioequivalence and Availability., 2 (5), 1 - 8Higher Bioavailability and Contamination by Copper in the Edible Mussels, Snails and Horseshoe Crabs at Kampung Pasir Puteh: Evidence of an Industrial Effluent Receiving Site at Pasir Gudang Area.
[査読有り]
- 2019年, Chemosphere, 229, 256 - 261Early developmental responses of three sea urchin species to tralopyril and its two degradation products.
[査読有り]
Background: It is well-known that the incidence of ventricular tachyarrhythmias is the highest in winter and during the daytime in patients with structural heart disease. However, little is known about the seasonal and circadian distributions of ventricular fibrillation (VF) in patients with Brugada syndrome. Objective: The aim of this study was to investigate seasonal and circadian distributions of VF in patients with Brugada syndrome. Methods: We analyzed the data of appropriate shock episodes for VF recorded by an implantable cardioverter-defibrillator (ICD) in patients with Brugada syndrome. Results: Among 62 consecutive Brugada syndrome patients with an ICD (48 ± 14 years, 58 males), 19 patients had at least one episode of an appropriate ICD shock due to VF during a mean follow-up of 70 ± 36 months, and 98 episodes were evaluated as isolated VF. There was a significant peak between March and June (P = .03). As for the circadian variation, significantly more VF occurred from midnight to 6:00 (P < .0001). Electrical storms of VF occurred in seven patients. The seasonal and circadian variations of electrical storms were similar to those of the isolated VF episodes. Conclusions: In patients with Brugada syndrome, there was a significant seasonal peak from spring to early summer and a significant circadian peak from midnight to early morning in terms of the occurrences of VF. © 2008 Heart Rhythm Society.
2008年11月, Heart Rhythm, 5 (11), 1523 - 1527, 英語[査読有り]
研究論文（学術雑誌）
A 69-year-old man with pacemaker was referred to our center for cerebral infarction. He had a high fever for 10 days during his hospitalization. Pacing failures deteriorating to asystole were observed responsible for bacterial vegetation around the tip of the pacemaker lead, which is rare but important for the cause of pacing failure. © 2008, The Authors.
2008年08月, PACE - Pacing and Clinical Electrophysiology, 31 (8), 1083 - 1084, 英語[査読有り]
研究論文（学術雑誌）
This case report describes a patient with an intravascular infection of a pacemaker system with Stenotrophomonas maltophilia, which occurred 17 years after the implantation. The patient was treated with appropriate antibiotics and debridement of the infectious tissue in the pocket, and the entire pacemaker system was removed by open heart surgery. She was discharged from our center after a 6-week course of antibiotics and implantation of a new pacemaker. Copyright © 2007 S. Karger AG.
2008年06月, Cardiology, 110 (4), 226 - 229, 英語[査読有り]
研究論文（学術雑誌）
An international conference held by the International Maritime Organization in October 2001 adopted an "International convention on the control of harmful anti-fouling systems on ships." This treaty includes bans on the use of harmful organotin compounds, which act as biocides in paint products. The Japanese government ratified the treaty in July 2003. The Japan Paint Manufacturers' Association (JPMA) has commenced a program of self-control of antifouling systems in Japan and has issued on their website a list of registered paint products with and without certain biocides. The purpose of this review is to assess the status of the antifouling systems that are being used in Japan, based on the JPMA list. A total of 380 paint products from ten paint companies were registered by June 2005. Sixteen biocides are registered in 359 products, and the remaining 21 products contain no biocides. Single biocides are used in 60 products, as two-mixtures in 200 products, as three-mixtures in 80 products, and as four-mixtures in 19 products. Five biocides, such as cuprous oxide, triphenylborane-pyridine, Sea-Nine 211, copper thiocyanate, and chlorothalonil, are used as a single product. Combinations such as cuprous oxide and copper pyrithione, zinc pyrithione and triphenylborane-pyridine, cuprous oxide and Diuron, and cuprous oxide and zinc pyrithione are mainly used in two-biocide mixtures to produce synergistic antifouling effects. © Springer-Verlag Berlin Heidelberg 2005.
2006年, Handbook of Environmental Chemistry, Volume 5: Water Pollution, 5, 201 - 212, 英語[査読有り]
研究論文（国際会議プロシーディングス）
Objectives The goal of this study was to evaluate the prevalence and the clinical significance of ST-segment elevation during recovery from exercise testing. Background During recovery from exercise testing, ST-segment elevation is reported in some patients with Brugada syndrome (BrS). Methods Treadmill exercise testing was conducted for 93 patients (91 men), 46 ± 14 years of age, with BrS (22 documented ventricular fibrillation, 35 syncope alone, and 36 asymptomatic) and for 102 healthy control subjects (97 men), 46 ± 17 years of age. Patients were routinely followed up. The clinical end point was defined as the occurrence of sudden cardiac death, ventricular fibrillation, or sustained ventricular tachyarrhythmia. Results Augmentation of ST-segment elevation < 0.05 mV in V1 to V3 leads compared with baseline was observed at early recovery (1 to 4 min at recovery) in 34 BrS patients (37% [group 1]), but was not observed in the remaining 59 BrS patients (63% [group 2]) or in the 102 control subjects. During 76 ± 38 months of follow-up, ventricular fibrillation occurred more frequently in group 1 (15 of 34, 44%) than in group 2 (10 of 59, 17% p = 0.004). Multivariate Cox regression analysis showed that in addition to previous episodes of ventricular fibrillation (p = 0.005), augmentation of ST-segment elevation at early recovery was a significant and independent predictor for cardiac events (p = 0.007), especially among patients with history of syncope alone (6 of 12 [50%] in group 1 vs. 3 of 23 [13%] in group 2) and among asymptomatic patients (3 of 15 [20%] in group 1 vs. 0 of 21 [0%] in group 2). Conclusions Augmentation of ST-segment elevation during recovery from exercise testing was specific in patients with BrS, and can be a predictor of poor prognosis, especially for patients with syncope alone and for asymptomatic patients. © 2010 American College of Cardiology Foundation.
2010年11月02日, Journal of the American College of Cardiology, 56 (19), 1576 - 1584, 英語[査読有り]
研究論文（学術雑誌）
Background: The intervals of the driving restrictions after an implantable cardioverter defibrillator (ICD) replacement vary across the different countries around the world. However, little is known regarding the appropriate duration for driving restrictions after an ICD replacement. The aim of this study was to investigate the clinical effect of ICD replacements and to elucidate when to resume driving an automobile after an ICD replacement. Methods and Results: The study reviewed 139 consecutive patients with an ICD replacement in order to evaluate the incidence of ICD therapies before and after ICD replacements, and to assess the time dependence of the ICD therapies after the ICD replacement. There was no significant difference in the incidence of ICD therapies delivered during durations of 3 months and 6 months before and after the ICD replacement (P=0.28, and 1.0, respectively). ICD therapies after the replacements were observed in 8.6% of the patients who were legally eligible to drive according to the Japanese guidelines at 1 year, and that was associated with a relatively low annual risk of death or injury to others. Conclusions: Implantable cardioverter defibrillator replacements did not affect the future ICD therapies under similar algorithms. The appropriate interval for driving restrictions after an ICD replacement is recommended to be a week or so, with a system integrity check performed before resumption of driving.
2010年11月, Circulation Journal, 74 (11), 2301 - 2307, 英語[査読有り]
研究論文（学術雑誌）
A 76-year-old man with a history of atrial septal defect repair underwent radiofrequency (RF) ablation of typical atrial flutter. During electrophysiological study, incessant sharp potentials were recorded, originating from the ostium of the inferior vena cava (IVC), and dissociated from atrial activity. During sinus rhythm, these potentials propagated to the atria and caused premature complexes when falling beyond the atrial refractory period. Electro-anatomical mapping revealed the presence of the earliest potential in the postero-lateral ostium of the IVC, propagating to the septal region. After RF isolation of the IVC, the patient has remained arrhythmia-free over a 5-year follow-up. © 2010 Wiley Periodicals, Inc.
2010年07月, PACE - Pacing and Clinical Electrophysiology, 33 (7), e62 - e64, 英語[査読有り]
研究論文（学術雑誌）
Background: Electrical storm (ES) is a serious problem in patients with an implantable cardioverter defibrillator (ICD). However, insufficient reports have indicated the predictors of ES in ICD patients with idiopathic dilated cardiomyopathy (DCM). The purpose of this study was to clarify the predictors of ES for risk stratification in DCM patients with an ICD. Methods and Results: Of 446 ICD patients, 53 DCM patients were included in this study. During a mean follow-up of 55±36 months, ES (≥3 times appropriate ICD therapy within 24 h) occurred in 18/53 (34%) patients. According to multivariate Cox proportional hazard regression analysis, a duration of the terminal low amplitude signals of < 40 μV (LAS40) (HR 1.4/10 ms increase, 95% confidence interval (CI) 1.1-2.1 P=0.0049) or root mean square voltage of the last 40 ms of the QRS complex (RMS40) (HR 0.88/1 μV, 95%CI 0.77-0.96 P=0.001) on the signal averaged electrocardiogram, and a history of atrial fibrillation (AF) before ICD implantation (HR 2.3, 95%CI 1.2-5.0 P=0.013) were independently associated with an increased risk of ES. Conclusions: Our data indicated that a longer LAS40, lower RMS40 and history of AF before ICD implantation could strongly predict ES, and the combination of those parameters could effectively stratify the risk of ES in DCM patients.
2010年, Circulation Journal, 74 (9), 1822 - 1829, 英語[査読有り]
研究論文（学術雑誌）
Background: This study evaluated the efficacy of amiodarone for avoiding inappropriate therapies by implantable cardioverter defibrillators (ICDs). Methods and Results: A total of 232 patients with structural heart disease (58±13 years 78% males) who underwent an initial ICD implantation were retrospectively investigated to compare baseline characteristics and event rates of inappropriate ICD therapy delivery between patients with oral amiodarone therapy (amiodarone group, n=116) and those without (non-amiodarone group, n=116). During a mean follow-up of 29±21 months, inappropriate therapies occurred less frequently in the amiodarone group than in the non-amiodarone group (12% vs 27%, P=0.0068). As a cause of inappropriate ICD therapy, only atrial fibrillation (AF) significantly differed between the groups (3% vs 12%, P=0.01). The results of multivariate logistic regression analysis showed that amiodarone therapy (odds ratio (OR) 0.38, 95% confidence interval (CI) 0.19-0.77, P=0.0073) and no history of spontaneous AF (OR 0.27, 95%CI 0.13-0.57, P=0.0007) were independent predictors of a lower risk of inappropriate ICD therapy. Conclusions: In the present group of ICD patients with structural heart disease, inappropriate therapy delivery occurred predominantly in those with spontaneous AF and/or without amiodarone.
Japanese Circulation Society, 2010年, Circulation Journal, 74 (7), 1302 - 1307, 英語[査読有り]
研究論文（学術雑誌）
Aims: The atrioventricular (AV) septal junction includes the coronary sinus (CS) and the compact part of the AV node and its posterior extensions. It has been recognized as the target site for ablation therapy of the AV nodal reentrant tachycardia and its variant forms. Despite the clinical significance of this region, the arrangement of the musculature in the AV septal junction, including the CS, has not fully been elucidated. We tried to explore the histological muscular diversity within the AV septal junction. Methods and results: Sixteen autopsied human hearts (seven women), mean age 59.8 years, without structural anomalies, were studied. We removed the whole AV septum, including the CS opening after the macroscopic measurements, and prepared serial sections parallel to mitral and tricuspid annuli (short-axis style) to elucidate the positional relationships between the compact AV node and the CS musculature. Out of 16 hearts, the CS musculature extended deeply into the AV septal junction in eight hearts. In the other eight hearts, the CS musculature was located above the AV septal junction. In the former group, we found that the offset of both annuli was wide (mean 3.8 ± 1.4 vs. 2.4 ± 1.1 mm), the distance between CS opening and membranous septum was long (mean 14.8 ± 1.6 vs. 12.3 ± 2.2 mm), and the CS opening level was lower and closer to the His bundle level (mean 2.8 ± 1.9 vs. 5.8 ± 2.9 mm) (P < 0.05). Conclusion: The deep extension of CS musculature into the AV septal junction seems to increase the tissue non-uniformity in this area. © The Author 2010.
Oxford University Press, 2010年, Europace, 12 (5), 719 - 725, 英語[査読有り]
研究論文（学術雑誌）
Neurally Mediated Syncope in Brugada Syndrome. Introduction: Patients with type 1 Brugada electrocardiogram (ECG) and an episode of syncope are diagnosed as symptomatic Brugada syndrome however, all episodes of syncope may not be due to ventricular tachyarrhythmia. Methods and Results: Forty-six patients with type 1 Brugada ECG (all males, 51 ± 13 years, 29 spontaneous, 17 Ic-drug induced), 20 healthy control subjects (all males, 35 ± 11 years), and 15 patients with suspected neurally mediated syncope (NMS 9 males, 54 ± 22 years) underwent the head-up tilt (HUT) test. During the HUT test, 12-lead ECGs were recorded in all patients, and the heart rate variability was investigated in some patients. Sixteen (35%) of 46 patients with Brugada ECG, 2 (10%) of 20 control subjects, and 10 (67%) of 15 patients with suspected NMS showed positive responses to the HUT test. Although no significant differences were observed in HUT-positive rate among Brugada patients with documented VT (7/14 50%), syncope (5/19 26%) and asymptomatic patients (4/13 31%), the HUT-positive rate was significantly higher in patients with documented VT (50%) and those with VT or no symptoms (11/27, 41%) compared to that in control subjects (10%) (P < 0.05). Augmentation of ST-segment amplitude (≥0.05 mV) in leads V1-V3 was observed in 11 (69%) of 16 HUT-positive patients with Brugada ECG during vasovagal responses, and was associated with augmentation of parasympathetic tone following sympathetic withdrawal. Conclusion: Thirty-five percent of patients with Brugada ECG showed vasovagal responses during the HUT test, suggesting that some Brugada patients have impaired balance of autonomic nervous system, which may relate to their syncopal episodes. © 2010 Wiley Periodicals, Inc.
Blackwell Publishing Inc., 2010年, Journal of Cardiovascular Electrophysiology, 21 (2), 186 - 192, 英語[査読有り]
研究論文（学術雑誌）
Background-The prognosis of patients with saddleback or noncoved type (non-type 1) ST-elevation in Brugada syndrome is unknown. The purpose of this study was to clarify the long-term prognosis of probands with non-type 1 ECG and those with coved (type 1) Brugada-pattern ECG. Methods and Results-A total of 330 (123 symptomatic, 207 asymptomatic) probands with a coved or saddleback ST-elevation ≥1 mm in leads V 1-V 3 were divided into 2 ECG groups-type 1 (245 probands) and non-type 1 (85 probands)-and were prospectively followed for 48.7≥15.0 months. The absence of type 1 ECG was confirmed by drug provocation test and multiple recordings. The ratio of individuals with a family history of sudden cardiac death (14%) was lower than previous studies. Clinical profiles and outcomes were not notably different between the 2 groups (annual arrhythmic event rate of probands with ventricular fibrillation type 1: 10.2%, non-type 1: 10.6%, probands with syncope type 1: 0.6%, non-type 1: 1.2%, and asymptomatic probands type 1: 0.5%, non-type 1: 0%). Family history of sudden cardiac death at age < 45 years and coexistence of inferolateral early repolarization with Brugada-pattern ECG were independent predictors of fatal arrhythmic events (hazard ratio, 3.28 95% confidence interval, 1.42 to 7.60 P=0.005 hazard ratio, 2.66 95% confidence interval, 1.06 to 6.71 P=0.03, respectively, by multivariate analysis), although spontaneous type 1 ECG and ventricular fibrillation inducibility by electrophysiological study were not reliable parameters. Conclusions-The long-term prognosis of probands in non-type 1 group was similar to that of type 1 group. Family history of sudden cardiac death and the presence of early repolarization were predictors of poor outcome in this study, which included only probands with Brugada-pattern ST-elevation. (Circ Arrhythmia Electrophysiol. 2009 2:495-503.) Copyright © 2009 American Heart Association, Inc.
2009年10月, Circulation: Arrhythmia and Electrophysiology, 2 (5), 495 - 503, 英語[査読有り]
研究論文（学術雑誌）
A 68-year-old woman with idiopathic dilated cardiomyopathy suffered from drug-resistant monomorphic ventricular tachycardia (VT). Electrophysiological study revealed a re-entrant VT circuit located just beneath the inferior mitral valve annulus. The VT was considered to be related to the mitral valve isthmus and was abolished by radiofrequency ablation. The patient died 2 years after the ablation due to worsening of heart failure and an autopsy was performed. Pathological examination revealed ablation scar tissue on the localized myocardial bundle running parallel to the mitral valve annulus. Therefore, this bundle appeared to comprise the slow conduction area of the re-entrant VT in this case.
2009年06月, Europace, 11 (6), 827 - 830, 英語[査読有り]
研究論文（学術雑誌）
Background: Although high defibrillation threshold (DFT) is a major and unavoidable clinical problem after implantation of an implantable cardioverter defibrillator (ICD), little is known about the cause and management of a high DFT in patients with hypertrophic cardiomyopathy (HCM). The purpose of this study was to assess the predictors of a high DFT in patients with HCM. Methods and Results: Twenty-three patients with non-dilated HCM who underwent ICD implantation were included. The DFT at the time of the device implantation was measured in all patients. The patients were divided into 2 groups, a high DFT group (DFT ≥15J, n=13) and a low DFT group (DFT < 15J, n=10) and their baseline characteristics were compared. The QRS duration was longer in the high than in the low DFT group (128±31 vs 103±12ms, respectively P=0.02). QRS duration, left ventricular (LV) end-systolic diameter, and LV ejection fraction were significant predictors of DFT in univariate analysis. However, in multivariate analysis, the only factor significantly associated with DFT was QRS duration (P=0.002). Conclusions: QRS duration is the most consistent predictor of a high DFT in HCM patients undergoing ICD implantation.
2009年06月, Circulation Journal, 73 (6), 1028 - 1032, 英語[査読有り]
研究論文（学術雑誌）
Background: Intra-atrial reentrant tachyarrhythmia (IART) after surgical repair for congenital heart diseases (CHD) has not been noninvasively characterized. Methods and Results: The 28 patients after surgery for CHD and 14 patients without surgery were investigated by 87-lead body surface mapping (BSM), 12-lead electrocardiogram (ECG), 20-lead signal averaged ECG (SAECG) and endocardial electroanatomical mapping (CARTO) during clockwise (CW: n=9) or counterclockwise (CCW: n=5) incisional atrial tachycardia (Incision-AT), CCW (n=23) or CW (n=4) cavotricuspid isthmus-dependent atrial flutter (CTI-AFL), and double-loop reentry (n=4). On the BSM, the isopotential map pattern and its locus of the minimum potential could differentiate the reentrant circuits, and the activation map revealed the reentrant circuits, which were highly coincident with those obtained from CARTO. On the 12-lead ECG, negative-positive polarity in the inferior leads or a discordant pattern in the precordial leads was observed in all cases of CTI-AFL, but 3/14 Incision-AT, positive polarity in lead V1 was observed in all cases of CCW, but none of CW CTI-AFL, positive polarity in lead I was observed in all cases of CW, but none of CCW Incision-AT. Conclusions: Flutter-wave isopotential map and its activation sequence from the BSM predict reentrant circuits of IART after surgery for CHD. Flutter-wave polarity on the 12-lead ECG could differentiate these reentrant patterns.
2009年03月, Circulation Journal, 73 (3), 451 - 460, 英語[査読有り]
研究論文（学術雑誌）
A 74-year-old female with a diagnosis of idiopathic dilated cardiomyopathy and ventricular tachycardia died suddenly 9 years after an implantation of an implantable cardioverter-defibrillator (ICD). The destructive removal of an ICD generator and the leads by an uninformed coroner resulted in the loss of the fragile electrograms during the terminal episodes of VT/VF and caused severe charring on the surface of the ICD generator. In order to observe the conditions in which the shock deliveries occurred during the noise detection, we programmed the ICD to deliver the maximum shock energy via a programmer while keeping continuous contact between the device surface and shock lead. The maximum shock energy of 31 Joules produced significant sparks from the surface of the ICD. To avoid the loss of data from an ICD and injury to the patient, widespread notification and education through appropriate scientific societies about the functions of ICDs are highly recommended.
2009年, International Heart Journal, 50 (6), 823 - 827, 英語[査読有り]
研究論文（学術雑誌）
This case report describes abrupt heart rate fallings below the lower pacing rate limit in a patient with cardiac resynchronization therapy (CRT). Interrogated information including stored episodes or data regarding the lead did not show any device problems and only simultaneous intracardiac electrogram revealed the cause, T-wave oversensing during biventricular pacing. At this moment, CRT has become an established modality for patients with severe heart failure. However, bradycardia below the lower rate limit during biventricular pacing due to T-wave oversensing would exacerbate heart failure in patients with CRT. We should notice this latent risk and correct the malfunction immediately. © 2010 Wiley Periodicals, Inc.
2012年03月, PACE - Pacing and Clinical Electrophysiology, 35 (3), e55 - e58, 英語[査読有り]
研究論文（学術雑誌）
Background: Use of programmed electrical stimulation (PES) for risk stratification of Brugada syndrome (BrS) is controversial. Objective: To elucidate the role of the number of extrastimuli during PES in patients with BrS. Methods: Consecutive 108 patients with type 1 electrocardiogram (104 men, mean age 46 ± 12 years 26 with ventricular fibrillation [VF], 40 with syncope, and 42 asymptomatic) underwent PES with a maximum of 3 extrastimuli from the right ventricular apex and the right ventricular outflow tract. Ventricular arrhythmia (VA) was defined as VF or nonsustained polymorphic ventricular tachycardia > 15 beats. Patients with VA induced by a single extrastimulus or double extrastimuli were assigned to group SD (Single/Double), by triple extrastimuli to group T (Triple), and the remaining patients to group N. Results: VA was induced in 81 patients (VF in 71 and polymorphic ventricular tachycardia in 10), in 4 by a single extrastimulus, in 41 by double extrastimuli, and in 36 by triple extrastimuli. During 79 ± 48 months of follow-up, 24 patients had VF events. Although the overall inducibility of VA was not associated with an increased risk of VF (log-rank P =.78), group SD had worse prognosis than did group T (P =.004). KaplanMeier analysis in patients without prior VF also showed that group SD had poorer outcome than did group T and group N (P =.001). Positive and negative predictive values of VA induction with up to 2 extrastimuli were, respectively, 36% and 87%, better than those with up to 3 (23% and 81%, respectively). Conclusions: The number of extrastimuli that induced VA served as a prognostic indicator for patients with Brugada type 1 electrocardiogram. Single extrastimulus or double extrastimuli were adequate for PES of patients with BrS. © 2012 Heart Rhythm Society.
2012年02月, Heart Rhythm, 9 (2), 242 - 248, 英語[査読有り]
研究論文（学術雑誌）
Background: Although the incidence of ventricular tachyarrhythmias associated with structural heart disease is highest in winter and during the daytime, seasonal and circadian variations among cardiac events in patients with congenital long QT syndrome (LQTS) remain unknown. The present study aims to determine seasonal and circadian cardiac events in patients with a congenital LQTS genotype. Methods and Results: The medical records of 196 consecutive patients with symptomatic LQTS (age, 32±19 years female, n=133 LQT1, n=86 LQT2, n=95 LQT3, n=15) who were genotyped between 1979 and 2006 at 2 major Japanese institutions were retrospectively analyzed. The patients with LQT1, LQT2, and LQT3 developed 223,550 and 59 cardiac events during a mean follow-up of 26, 33, and 25 years, respectively. The numbers of cardiac events significantly peaked during the summer among those with LQT1 (P< 0.001) and from summer to fall in those with LQT2 (P< 0.001), but reached the nadir in winter among those with LQT3 (P=0.003). Cardiac events significantly peaked in the afternoon (12:00-17:59) and morning (06:00-11:59) among those with LQT1 (P< 0.001) and LQT2 (P< 0.001). Conclusions: The frequency of cardiac events was specifically seasonal and circadian among patients with the 3 major genotypes of congenital LQTS.
2012年, Circulation Journal, 76 (9), 2112 - 2118, 英語[査読有り]
研究論文（学術雑誌）
A high incidence of early repolarization (ER) pattern in the inferolateral leads has been reported in patients with idiopathic ventricular fibrillation (IVF). Brugada syndrome (BS) is characterized by J-point or ST-segment elevation in the right precordial leads and ventricular fibrillation, and some patients with BS also have ER in the inferolateral leads. To compare the clinical characteristics and effects of sodium-channel blockade on ER between IVF patients with ER (early repolarization syndrome [ERS]) and BS patients with or without ER. Fourteen patients with ERS and 21 patients with BS were included in this study. ER was defined as an elevation of at least 0.1 mV from baseline in the QRST junction in the inferorolateral leads. Provocative tests with sodium-channel blockers were conducted in all patients with ERS to distinguish ERS from BS. In the ERS group, all patients were male and most patients experienced ventricular fibrillation during sleep or low activity (79%). ER was attenuated by sodium-channel blockers in most patients with ERS (13/14, 93%) and BS (5/5, 100%), whereas ST-segment elevation was augmented in the right precordial leads in the BS group. The rates of positive late potentials were significantly higher in the BS group (60%) than in the ERS group (7%) (P < .01). Some similarities were observed between ERS and BS, including gender, arrhythmia triggers, and response of ER to sodium-channel blockers. Unlike the ST segment in the right precordial leads in BS, ER was attenuated in patients with both ERS and BS, suggesting a differential mechanism between ER in the inferolateral leads and ST elevation in the right precordial leads.
2012年01月, Heart Rhythm, 9 (1), 77 - 83, 英語[査読有り]
研究論文（学術雑誌）
Introduction: The aim of this study was to clarify the characteristics of lower loop reentry (LLR) in patients who underwent cardiac surgery. Methods: Of 194 patients from 2000 to 2007 with negative flutter waves in the inferior leads (II, III, and aVf), 4 patients had LLR and reentrant circuits identified by a 3D activation sequence mapping system. We studied the characteristics of the surface electrocardiogram (ECG) patterns of those LLRs. Results: All 4 patients had a history of an intracardiac operation. The 3D activation sequence mapping system during the LLR exhibited a clockwise (CW) wavefront around the inferior vena cava (IVC) from the caudal view. During the LLR, the right atrium (RA) free wall was activated in a caudal-cranial sequence and a collision of two activation wavefronts from the lower RA and upper RA occurred at the RA free wall. Conclusions: The 3D activation mapping during the AT revealed an activation wavefront propagating around the IVC and the diagnosis of LLR. Detailed 3D electroanatomical mapping and pacing study are needed to identify the reentrant circuit of LLR in patients with previous intracardiac surgery. (J Arrhythmia 2011 27: 38-48). © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27 (1), 38 - 48, 英語[査読有り]
研究論文（学術雑誌）
Purpose: Recently, substrate-based Catheter ablation (CA) can be applied to more complicated cases. We aimed to compare the efficacy between substrate-based and activation/entrainment-based VT ablation. Methods: We investigated consecutive 76 patients (55 male) with structural heart disease who underwent CA of VT to analyze relationship between ablation-strategy and clinical outcome. The patients included 25 individuals with ARVC, 16 with ischemic heart disease, 14 with DCM, 11 with sarcoidosis, and 10 with other heart diseases. The patients were divided into two groups according to ablation-strategy, substrate-based mapping group (Group-S, N=45) and activation/entrainment mapping group (Group-AE, N=31). Successful CA was defined as non-inducibility of any VT at the end of procedure. Results: There were no significant differences in LVEF, and percentage of ICD implantation between 2 groups. There were also no significant differences in percentage of successful CA and number of RF applications. During 4 years of follow-up, no significant differences were shown in recurrences of sustained VT, hospitalization due to heart failure, and cardiac death. Conclusions: The two different ablation strategies, substrate-based and activation/entrainment mapping, were equally effective to reduce VT events and brought favorable prognosis in patients with structural heart disease. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 419, 英語[査読有り]
研究論文（学術雑誌）
Background: Efficacy of Quinidine was reported in patients with idiopathic ventricular fibrillation (VF) associated with early repolarization pattern on the electrogram. However, we experienced a case with recurrent VF associated with early repolarization pattern which was refractory to quinidine. Case: A 64-year-old woman was admitted to our hospital. Two years ago, she was diagnosed as idiopathic VF associated with early repolarization pattern and underwent implantable cardioverter-defibrillator (ICD) implantation. During follow-up period, ICD showed multiple VF episodes at early morning. Quinidine and bepridil were initiated but failed to prevent VF attacks. Ventricular pacing also could not suppress VF episodes. We tried cilostazol which was reported as an effective drug to prevent VF in Brugada syndrome. After cilostazol was initiated, no VF episodes were observed during her hospitalization and follow-up of 4 months.This case report demonstrated the efficacy of the cilostazol therapy to eliminate recurrent VF in a patient with early repolarization syndrome like Brugada syndrome. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 209, 英語[査読有り]
研究論文（学術雑誌）
Background: Optimal left ventricular (LV) site selection is major clinical interest for cardiac resynchronization therapy (CRT) implantation. The impact of LV lead position on outcome in CRT patients is still unclear. Methods and Results: We evaluated 109 consecutive heart failure (HF) patients (age 63±13 years, LV ejection fraction 26±11%, QRS duration 163±37ms) who had successfully placement LV lead with follow-up of 703±352 days. The location of the LV lead was assessed by chest x-rays and coronary venograms at device implantation. The LV lead position was classified into an anterior, lateral or posterior position along the short axis and into a basal, midventricular or apical position along the long axis. After CRT implantation, improvement of HF symptoms did not depend on the LV lead positions. No significant changes were found in the magnitude of left ventricular reverse remodeling and the proportion of responders between the LV lead positions. Based on the Kaplan-Meier analysis, the apical lead location indicated higher tendency in HF/death compared with non-apical position (p =0.10), whereas the benefit of CRT was indifferent to the lead position along the short axis (p= 0.876). Conclusion: LV lead position associated with the short axis was not a major determinant of response to CRT. However apical site LV lead position could be unfavorable on outcome. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 265, 英語[査読有り]
研究論文（学術雑誌）
Background: Cardiac resynchronization therapy (CRT) is an effective treatment for patients with drug-refractory, chronic heart failure. However, phrenic nerve stimulation (PNS) sometimes becomes critical causes of failure to deliver CRT. In clinical practice, a low stimulation output of the LV lead is often chosen to avoid PNS but it does not always settle this problem. Methods and Results: To assess the efficacy of electronic repositioning and changing pulse width for PNS, we reviewed our cohort of 55 patients underwent CRT implantation from 2008 to 2010. Clinical PNS was detected in 3 of 55 patients after reduced stimulation amplitude near the pacing threshold. Electronic repositioning was made by reprograming of cathode and/or pacing output of amplitude was reduced in combination with changing pulse width (1.5V/0.47ms to 1.08V/0.53ms). All patients could avoid PNS and deliver CRT without lead replacement after this reprograming. Conclusion: Electronic repositioning in combination with changing pulse width is effective to avoid PNS and deliver CRT. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 206, 英語[査読有り]
研究論文（学術雑誌）
Background: Atrial fibrillation (AF) is the most common tachyarrhythmia in patients with hypertrophic cardiomyopathy (HCM). The maintenance of sinus rhythm (SR) is sometimes challenging. This study evaluated the clinical outcome of patients with HCM and AF treated with radiofrequency catheter ablation (RFCA). Methods and Results: 17 patients (7 female and aged 61±12 years, mean LAD of 49mm) with paroxysmal (n=12 71%) or persistent (n=5 29%) were enrolled. The pulmonary vein isolation was performed in all patients, cavo-tricuspid isthmus ablation in 6, and CFAE ablation in 3. During follow-up of 16±11 months, 10 patients had AF recurrence. After the second procedure in 4 of 10 recurrent patients, 8 in 17 patients (47.1%) were in stable sinus rhythm (SR) with concomitant use of anti-arrhythmic drugs in 13 of 17 patients. In the patients with restoring SR, left atrial diameter (LAD) was significantly smaller compared to those with AF (46±6 vs 52±4 P< 0.05). In the patients with LAD < 50mm, 7 in 9 patients (88.9%) remained in SR compared with 1 in 8 patients (12.5%) with LAD > 50mm (P< 0.01). Conclusion: The recurrence of AF was highly observed after RFCA in patients with HCM. The promising clinical result may be provided after RFCA in HCM with smaller LAD (< 50mm). © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
Background and Objective: Unexpected venous occlusions or anatomic variants are encountered during de novo transvenous lead implantation. This study examined the prevalence and risk factors of venous abnormalities in patients undergoing de novo permanent pacemaker (PPM) implantation by the transvenous approach. Methods: The study involved 653 consecutive patients who underwent de novo PPM implantation. During the procedure, the venous network of the arms was evaluated using intravenous angiography. Results: Complete venous occlusion was observed in 5 of the 653 patients (0.77%). The lead was implanted on the right opposite site in 4 patients. There were a history of central catheter insertion in four patients, prior thoracic surgery in three, and chemotherapy in two. A persistent left superior vena cava (PLSVC) was observed in 4 patients (0.61%). PPM was implanted from the right opposite side in 2 patients. All PLSVC patients showed normal chest radiographs, but 3 of the 4 patients showed coronary sinus dilatation on echocardiography. Conclusions: Patients requiring transvenous pacing lead implantation rarely exhibit venous abnormalities. However, venous occlusion should be taken into consideration, particularly in patients with a history of insertion of central catheters, thoracic surgery, or chemotherapy. Careful echocardiography test for coronary sinus dilatation must be conducted to detect a PLSVC before the implantation. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
Background: The monomorphic ventricular tachycardia (MMVT) is rare in patients with hypertrophic cardiomyopathy (HCM). This study analyzed the anatomical and electrophysiological characteristics in patients with HCM complicated with MMVT. Methods and Results: The patient population consisted of 11 patients (3 female and aged 60±12 years) with HCM-related MMVT, including 2 apical aneurysm and 2 apical HCM and no left ventricular outflow tract (LVOT) obstruction. The 12-ECG during VT (mean CL 378± 78msec) demonstrated LBBB in 2 and RBBB in 9. Catheter ablation was performed in 6 patients with VT map based ablation and 4 with substrate based ablation. In 5 of 10, VTs have been non-inducible after procedure. During 60±45 months follow-up, 5 of 10 had recurrence of MMVT. The autopsy and histopathlogical analysis was undergone in a patient who died from pneumonia before the Catheter ablation. The pathological finding demonstrated the endocardial fibrosis at the site close to His bundle branch of LVOT, where the MMVT origin was estimated from 12-ECG morphology. Conclusion: In patients with HCM-related MMVT, endocardial Catheter ablation resulted in low success rate and a high recurrence of VT, seemed to have a limited role to prevent lethal arrhythmia. The myocardial fibrosis within hypertrophic myocardial wall may be the substrate of MMVT in HCM. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 232, 英語[査読有り]
研究論文（学術雑誌）
Backgrounds: Intravenous Amiodarone (AMD) therapy has been used for refractory ventricular tachyarrhythmias. However, efficacy of AMD and responses of electrocardiographic parameters have not yet been fully investigated. Methods: We reviewed 27 consecutive patients (64± 16 y.o., 19 males, 10 ischemic heart diseases), in whom intravenous AMD was used for refractory ventricular tachyarrhythmias (8 VF, 18 sustained VT, and 1 non-sustained VT) from July 2007 to July 2010. Efficacy of AMD was defined as restoration of sinus rhythm or reduction of arrhythmic episodes within 48 hours. Responses of electrocardiographic parameters in relation to AMD efficacy were evaluated. Results: Intravenous AMD for average of 12.4± 11.0 days was completely effective in 19 (70.4%) of 27 patients without any proarrhythmic events of Torsade de Pointes. Maximal serum concentration of amiodarone and desethylamiodarone was 1.51 ±0.87 and 0.36±0.33 mg/L, respectively. QTc was not different at baseline, however, the QTc was more significantly prolonged in 19 effective patients than in 8 ineffective patients (δQTc, 50±53 vs. 4±30 msec p=0.03), whereas increase of Tpeak to Tend interval reflecting transmural dispersion of repolarization (TDR) was comparable between 2 groups (δTpeak-Tend, 20±35 vs. 19±39 msec). Conclusions: Intravenous AMD was effective in patients with refractory ventricular tachyarrhythmias with proper QT prolongation but without increasing TDR after AMD. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 421, 英語[査読有り]
研究論文（学術雑誌）
Background: Cardiac resynchronization therapy (CRT) is a treatment for heart failure (HF) with electromechanical dyssynchrony. However, there is no available tool to accurately predict the efficacy. We hypothesized that magnetocardiography (MCG) with high spatio-temporal resolution can predict the CRT response. Methods: We analyzed 64-ch MCGs in 25 patients with HF and QRS prolongation on ECG (18 CLBBB, 7 IVCD). According to the 2-D current mapping, they were divided into 2 groups (Group-A with Uni-directional pattern and Group-B with Multi-directional pattern). We compared clinical and echocardiographic characteristics at 6 months after CRT implantation. CRT responder was defined when > 10% LVDd decrease or > 10% LVEF increase was recognized. Results: There were no significant differences between the groups in baseline LVDd, LVEF, BNP, and NYHA. After 6 months, we found 12 responders out of 13 Group-A patients and 9 non-responders out of 12 Group-B patients (p=0.001). During the follow-up of 721±339 days, cardiac events occurred less frequently occurred in Group-A (only 1 HF hospitalization) vs. Group-B (1 death, 2 LVAS implant, 5 HF hospitalization). Conclusions: MCG can predict the CRT response and long-term prognosis after CRT. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
The electrophysiological hallmark of cells and tissues isolated from failing hearts is prolongation of action potential duration (APD) and conduction slowing. In human studies and a number of animal models of heart failure, functional downregulation of K+ currents and alterations in depolarizing Na+ and Ca2+ currents and transporters are demonstrated. Alterations in intercellular ion channels and matrix contribute to heterogeneity of APD and conduction slowing. The changes in cellular and tissue function are regionally heterogenous particularly in the heart failure with dyssynchronous LV contraction (DHF). Furthermore, < -adrenergic signaling and modulation of ionic currents is blunted in heart failure. Cardiac resynchronization therapy (CRT) partially reversed the DHF-induced downregulation of K+ current and improved Na+ channel gating. CRT significantly improved Ca2+ homeostasis especially in myocytes from late-activated, lateral wall, and restores the DHF-induced blunted < -adrenergic receptor responsiveness. CRT abbreviated DHF-induced prolongation of APD in the lateral wall myocytes and reduced the LV regional gradient of APD, and suppressed development of early afterdepolarizations. In conclusion, CRT partially restores the DHF-induced ion channel remodeling, abnormal Ca2+ homeostasis, blunted < -adrenergic response and regional heterogeneity of APD, thus may suppress ventricular arrhythmias and contribute to the mortality benefit of CRT as well as improve mechanical performance of the heart. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
Background: Permanent AF is occasionally observed in patients receiving ICDs. However, in some cases, AF could be terminated at DFTs. Benefit of dual chamber ICDs over single chamber ICDs in such patients is unclear. Methods: The study subjects consisted of 50 VT/VF patients with perm-AF (41males/9females, 61 ±12 y.o.) including 16 ischemic heart disease, 19 cardiomyopathy. In all patients, single chamber ICDs were selected and DFTs were performed. We assessed the frequency of SR restoration and maintenance of SR during follow-up. Results: Perm-AF was terminated in 15 (30%) patients at DFT. Longevity of AF, usage of amiodarone, LVEF were not significantly different between patients with and without termination of AF. Univariate regression analysis revealed smaller LAD (47 ±3 v.s. 54±2mm, p=0.03) and larger fibrillatory-wave in V1 (0.13 v.s. 0.08mV, p=0.02) could be predictors for SR restoration. During follow-up, sustained AF recurred in 13/15 at one month and in 14/15 at one year. Conclusion: In patients with smaller LAD and larger fibrillatory-wave in V1, perm-AF were possibly terminated at DFTs. However, because maintenance of SR was almost impossible, atrial leads are unnecessary. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 228, 英語[査読有り]
研究論文（学術雑誌）
Objectives: The goal of this study was to evaluate the prevalence and the clinical significance of ST-segment elevation during recovery from exercise testing. Background: During recovery from exercise testing, ST-segment elevation is reported in some patients with Brugada syndrome (BrS). Methods: Treadmill exercise testing was conducted for 93 patients (91 men), 46 ± 14 years of age, with BrS (22 documented ventricular fibrillation, 35 syncope alone, and 36 asymptomatic) and for 102 healthy control subjects (97 men), 46 ± 17 years of age. Patients were routinely followed up. The clinical end point was defined as the occurrence of sudden cardiac death, ventricular fibrillation, or sustained ventricular tachyarrhythmia. Results: Augmentation of ST-segment elevation β0.05 mV in V(1) to V(3) leads compared with baseline was observed at early recovery (1 to 4 min at recovery) in 34 BrS patients (37% [group 1]), but was not observed in the remaining 59 BrS patients (63% [group 2]) or in the 102 control subjects. During 76 ± 38 months of follow-up, ventricular fibrillation occurred more frequently in group 1 (15 of 34, 44%) than in group 2 (10 of 59, 17% p = 0.004). Multivariate Cox regression analysis showed that in addition to previous episodes of ventricular fibrillation (p = 0.005), augmentation of ST-segment elevation at early recovery was a significant and independent predictor for cardiac events (p = 0.007), especially among patients with history of syncope alone (6 of 12 [50%] in group 1 vs. 3 of 23 [13%] in group 2) and among asymptomatic patients (3 of 15 [20%] in group 1 vs. 0 of 21 [0%] in group 2). Conclusions: Augmentation of ST-segment elevation during recovery from exercise testing was specific in patients with BrS, and can be a predictor of poor prognosis, especially for patients with syncope alone and for asymptomatic patients. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27, 186, 英語[査読有り]
研究論文（学術雑誌）
Backgrounds: Laser lead extraction system has been introduced and the complete removal of the pacing system can be achieved transvenously in many cases. However, there are various pitfalls during the procedure. Case Report: A 87-year-old male was referred for us for the lead extraction due to recurent pocket infection. The VDD pacing lead was implanted via left subclavian vein against atrio-ventricular block in 1993. Atrial lead was added on the same side for the better atrial sensing in 2002. The pacemaker itself had been already removed and both leads were cut short. We tried lead extraction under general anesthesia in 2011. We put the locking stylets into both leads and used laser sheath. Atrial lead came out smoothly. However, VDD lead was severely adhered to the supra vena cava especially at the point of atrial sensing electrodes. During the procedure, insulation of the VDD lead was damaged and atrial electrode wire was exposed outside the lead and we could not advance the laser sheath. To salvage the atrial wire, we caught the wire tied with strings and pulled back. Finally, we could remove the pacing system transvenously. Conclusion: In the lead extraction of aged VDD lead, atrial electrode wire can be exposed. Protection of the atrial wire should be considered. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 313, 英語[査読有り]
研究論文（学術雑誌）
Introduction: Guillain-Barre syndrome (GBS) is an acute inflammatory demyelinating neuropathy accompanied with autonomic dysfunction. Although the mortality cause in patients hospitalized with GBS relates to cardiac arrhythmias, the electrocardiographic abnormalities in acute phase of GBS remains unclear. Methods: We retrospectively reviewed 11 patients hospitalized with GBS (7 men, mean age: 63 years) to evaluate the characteristics of 12-lead electrocardiogram (ECG) in acute phase. Results: 12-lead ECG showed sinus rhythm in all patients. Complete right bundle branch block were seen in 2 patients and first-degree atrioventricular block in 2 patients. The PQ, QRS, and QTc intervals (mean ±SD) were 160±24 ms, 100±20 ms, and 446±22 ms, respectively. J wave with the amplitude of 0.16±0.03 mV was observed in 8 (73%) patients. No patients showed lethal arrhythmias such as sinus arrest or ventricular tachycardia during hospitalization. Conclusion: J wave was frequently found among patients with GBS in acute phase, which may be related to autonomic dysfunction. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
Several studies indicated that intra-QRS fragmentation (QRSf) on ECG is a possible marker of lethal ventricular arrhythmias, however, the origin remains unclarified. We hypothesized that patients with hypertrophic cardiomyopathy (HCM) who experienced ventricular arrhythmia exhibit similar abnormalities, which can be visualized by magnetocardiography (MCG). Methods: In 21 HCM patients with a history of VT (n=11) and Vf (n=10), necessitating ICD subsequently, we examined the presence of QRSf on ECG and analyzed QRS current arrow mapping by using a 64- Ch MCG system. We measured left ventricular conduction time. Healthy volunteers (n=25) served as Controls. Results: In 19 of 21 patients, QRSf was present on ECG. MCG analysis revealed that LV conduction time in HCM patients was markedly prolonged. In 15 of 19 patients, during the period corresponding to QRSf, we recognized abnormal, complicated current patterns. Conclusions: HCM patients with a history of VT/Vf often showed QRSf on ECG, which is noninvasively visualized on the MCG 2-D current arrow maps. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, journal of arrhythmia, 27 (4), 297, 英語[査読有り]
研究論文（学術雑誌）
Using a 64-Ch magnetocardiographic (MCG) system, we analyzed left intraventricular conduction delay in patients with left anterior fascicular block (LAFB) on ECG that is hardly discernible on ECG. We repeated 3 measurements with sensors placed close to anterior, posterior, and left lateral chest wall (in the supine, prone, and lateral positions) in 7 LAFB patients with LV dysfunction and 25 volunteers (Cont). In Cont (QRS duration, QRSd=89±6ms), we constantly recognized 2 different currents arising from separate sites (i.e., propagations via left anterior and posterior fascicle). All LAFB patients (QRSd=105±10ms) showed quite different patterns where only upward propagation (via left posterior fascicle) was seen (no apparent downward currents via left anterior fascicle), compatible with LAFB. LV conduction time was greater in LAFB compared with Cont (74 ±11 vs. 51±5ms, p< 0.01). Our MCG approach could not only delineate the characteristic changes in intra-ventricular conduction due to LAFB but also quantify the subtle conduction delay which is hardly detectable on ECG. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 英語[査読有り]
研究論文（学術雑誌）
Introduction: Inappropriate shock due to T-wave oversensing (TWOS) is an unsolved issue in implantable cardioverter defibrillator (ICD) therapy. New algorithm launched by Medtronic utilizes electrogram (EGM) sense-pattern and morphology to distinguish TWOS from ventricular arrhythmias. We have evaluated this algorithm using human data. Methods: Stored EGMs of TWOS from 3 Japanese patients were fed into ICD bench system equipped with the new algorithm. We used original detection parameters to reproduce TWOS from recorded episodes. Then we re-analyzed the same episode using the new algorithm to test whether it could properly reject the TWOS and avoid shocks. Results: Case1: Brugada patient who recieved inappropriate shock due to TWOS in VF zone. Amplitude of R-wave and T-wave was 2mV and 3mV, respectively. Successful TWOS rejection was observed. Case2: Idiopathic VF patient who experienced inappropriate shock in VF zone. R-wave was variable (1.5-7.5mV) and T-wave was 2mV. Appropriate TWOS rejection was achieved. Case3: Hypertrophic cardiomyopathy patient who recieved 11 shocks due to TWOS in VT zone. R-wave was 14mV and T wave was 4mV. The algorithm rejected this episode properly. Conclusion: The new algorithm rejected TWOS and avoided the inappropriate shocks successfully in all these cases in the bench test. © 2011, Japanese Heart Rhythm Society. All rights reserved.
2011年, Journal of Arrhythmia, 27, 378, 英語[査読有り]
研究論文（学術雑誌）
This case report describes incessant monomorphic ventricular tachycardia (VT), not Torsade de Pointes, induced by intravenous amiodarone in a 48-year-old woman with dilated cardiomyopathy. VT was reproducibly triggered by short coupled premature ventricular complex (PVC) with different morphology from VT. After amiodarone infusion, the coupling interval of initiating PVC was prolonged, and moreover, the morphology of initiating PVC became the same as that of VT. Though amiodarone has become the first line drug to treat ventricular tachyarrhythmias in patients with cardiac dysfunction, it is important to be aware of its proarrhythmic effect, which may lead to an electrical storm of monomorphic VT. © 2011 The Japanese Society of Internal Medicine.
2011年, Internal Medicine, 50 (21), 2591 - 2595, 英語[査読有り]
研究論文（学術雑誌）
MISC
- 生物研究社, 2017年08月, 海洋と生物, 39 (4), 332 - 337, 日本語船体付着による水生生物の移動を最小化する対策
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- 2012年, 第21回 環境化学討論会 口頭発表, 日本語海技者の尿中PAH代謝物の分析
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- 19th IMSC 2012, 2012年, 19th IMSC 2012 Poster presentation, 英語Determination of hydroxylated polycyclic aromatic hydrocarbons in mariner's urine by high performance liquid chromatography-tandem mass spectrometry
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- 2009年, 付着生物学会誌 26(1): 33-41, 26 (1), 33 - 41, 日本語
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- 2006年, 水環境学会誌, 29: 433-437, 日本語海洋汚染とバイオアッセイ.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 2005年, 神戸大学海事科学部紀要., 2: 79-86., 日本語日本で使用される防汚システムの現状.
その他
- 2005年, 水, 47(3): 37-40., 日本語水域で意図的に使用される化学物質の環境内運命 �防汚剤イルガロールの分解性-.
記事・総説・解説・論説等（学術雑誌）
- 2004年, 日本海水学会誌., 58(4): 334, 日本語日本海水学会第４回若手の集いを終えて.
[査読有り]
その他
- 2004年, 環境科学会誌, 17(1): 83-84, 日本語第18回環境科学会セミナー報告.
[査読有り]
その他
- 2004年, 土木研究所資料, 第3921号, pp.258, 日本語環境毒性学における単一種試験の適用と解釈に関する指針文書（カナダ環境省出版物Guidance Document on Application and Interpretation of Single-species Tests in Environmental Toxicologyの訳書）
[査読有り]
その他
- 廃棄物学会, 2002年11月28日, 廃棄物学会研究発表会講演論文集, 13 (0), 1185 - 1187, 日本語新規船底防汚剤Irgarol 1051の毒性及びbioavailability評価 (第13回廃棄物学会研究発表会 講演論文集2) -- (有害性試験)
- 2002年, 水環境学会誌, 25(6):310-315, 日本語日本水環境学会第36回年会総括報告
[査読有り]
その他
- 2002年, 瀬戸内海区水産研究所 調査研究叢書, 第2号、37-43, 日本語化学物質の生態系影響評価試験の開発動向 -試験キットを用いた毒性試験法とその適用-.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 2000年, 瀬戸内海., 23: 15-20, 日本語有機スズ剤に替わる防汚剤の今.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 2000年, 昭和シェル石油環境研究助成財団-1998年度助成研究成果報告書, pp.86-87, 日本語第9回毒性評価に関する国際シンポジウムへの参加報告書
[査読有り]
その他
- 2000年, 京都大学環境保全センター「環境保全」, 15: 58-67, 日本語生物活性物質は消えてどこへ行く？.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 2000年, 生物工学会誌, 78(3):102, 日本語水環境の診断ツール -マイクロバイオテスト.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 2000年, 水, 42(1): 25-29, 日本語バイオレメディエーション研究事例 -クレオソート油汚染土壌浄化への光るタンパク質の利用-.
[査読有り]
記事・総説・解説・論説等（学術雑誌）
- 1998年, 環境毒性学会誌, 1(1): 70-71, 日本語第８回毒性評価に関する国際シンポジウム後記
[査読有り]
その他
書籍等出版物
- 共著, Nova Science Publishers, 2018年, 英語, Managing sustainable coastal environments by sediment watch: A review. Chapter 1, 1-21Sediment watch (Ed. Yap,C.K.)
学術書
- 共著, Encyclopedia of ecology, 2008年06月, 英語, ISBN: 9780444520333Antagonistic and synergistic effects of antifouling chemicals in mixture
学術書
- 単著, 科学研究費補助金基盤研究B研究成果報告書., 2008年, 日本語有機スズ代替防汚剤は底質中で無害となるか？
調査報告書
- 共著, 文部科学省リーディングプロジェクト. 一般・産業廃棄物・バイオマスの複合処理・再資源化プロジェクト., 2008年, 日本語「固体・ガス状試料の安全性評価システムの開発」成果報告書.
調査報告書
- 共著, Nova Publishers, 2008年, 英語Detoxification of steroidal hormones in the aquatic environment. In Drinking Water
学術書
- 共著, 文部科学省科学技術振興調整費 重要課題解決型研究., 2007年, 日本語廃棄物処分場の有害物質の安全・安心保障、最終成果報告書.
調査報告書
- 共著, Springer, 2006年, 英語Antifouling Paint Biocides. The Handbook of Environmental Chemistry.
学術書
- 共著, 丸善, 2005年, 日本語環境・健康科学辞典(日本薬学会編)
学術書
- 共著, 鉄鋼業環境保全技術開発基金., 2005年, 日本語2003年度環境助成研究成果概要集.
調査報告書
- 共著, 財団法人ひょうご科学技術協会, 2004年, 日本語平成15年度学術研究支援事業 研究成果報告書.
調査報告書
- 共著, 環境省廃棄物処理等科学研究費補助金, 2004年, 日本語「最終処分場管理における化学物質リスクの早期警戒システムの構築」総合研究報告書.
調査報告書
- 共著, ソルト・サイエンス研究財団, 2004年, 日本語ソルト・サイエンス研究財団-平成14年度助成研究報告集
調査報告書
- 共著, LESTARI, 2004年, 英語Indicators of Sustainable Development: Assessing Changes in Environmental Conditions
学術書
- 単著, 科学研究費補助金基盤研究C2研究成果報告書., 2003年, 日本語水環境における新規防汚剤の運命および生態影響.
調査報告書
- 共著, 環境科学振興財団, 2003年, 日本語新規船底防汚剤が海産プランクトンに及ぼす影響評価平成14年度クリタ水・環境科学振興財団 研究成果報告書.
調査報告書
- 共著, 滋賀県琵琶湖研究所, 2002年, 日本語滋賀県琵琶湖研究所プロジェクト研究(H9〜12年度)「湖内現象を考慮したノンポイント負荷削減対策の検討」報告書,390-394
調査報告書
- 共著, ソルト・サイエンス研究財団, 2002年, 日本語ソルト・サイエンス研究財団-平成12年度助成研究報告集 2000
調査報告書
- 共著, ソルト・サイエンス研究財団, 2001年, 日本語ソルト・サイエンス研究財団-平成11年度助成研究報告集 1999
調査報告書
- 共著, ソルト・サイエンス研究財団, 2000年, 日本語ソルト・サイエンス研究財団-平成10年度助成研究報告集 1998
調査報告書
- 共著, Kluwer Academic/Plenum Publishers, 2000年, 英語New Microbiotests for Routine Toxicity Screening and Biomonitoring
学術書
- 共著, 両備木聖園記念財団, 1999年, 日本語両備木聖園記念財団研究報告書
調査報告書
- 共著, 住友財団, 1999年, 日本語住友財団-平成9年度環境研究助成報告書
調査報告書
- 共著, 滋賀県琵琶湖研究所, 1999年, 日本語滋賀県琵琶湖研究所所報
調査報告書
- 共著, Marcel Dekker Inc., New York, 1997年, 英語Modern Soil Microbiology
教科書・概説・概論
- 共著, 日産科学振興財団, 1986年, 日本語日産科学振興財団研究報告書
調査報告書
- 共著, Marcel Dekker Inc., New York, 1984年, 英語Toxicity Screening Procedure Using Bacterial Systems.
学術書
講演・口頭発表等
- PICES2019, Victoria, BC, Canada, 2019年10月24日Antifouling compounds in Japan and its environmental risk.
[招待有り]
口頭発表（招待・特別）
- 第89回マリンエンジニアリング学術講演会, 講演論文集. p.245-246., 2019年10月03日ディーゼル機関からのススの変異原性と多環芳香族炭化水素の関係
- 第25回日本環境毒性学会研究発表会, P21, 70,, 2019年09月26日海藻類の増殖に及ぼす防汚剤の有害影響
- 第60回大気環境学会年会, 2019年09月船舶から排出されるPM及びその主要成分の特徴
- 第36回エアロゾル科学・技術研究討論会, 2019年09月06日航行中の船舶から排出されるPMの成分組成
- 第88回マリンエンジニアリング学術講演会講演論文集, 2018年10月舶用ディーゼル機関からのススの変異原性と多環芳香族炭化水素
- 第24回日本環境毒性学会, 2018年09月, 日本語, 国内会議ウニの受精・初期発生に対する船底塗装由来粒子の影響
口頭発表（一般）
- 平成30年度瀬戸内海研究フォーラムin兵庫, 2018年08月, 日本語, 神戸大学100年記念館, 国内会議沿岸域の汚染を評価するための海藻類増殖阻害試験法の開発
ポスター発表
- 27th Symposium on Environmental Chemistry, 2018年05月, 英語, Okinawa, 国際会議Embryotoxicity of the antifouling biocide tralopyril on sea urchin Pseudocentrotus depressus.
口頭発表（一般）
- The 11th International Symposium on Marine Engineering (ISME2017 Tokyo), 2017年10月, 英語, 国際会議Distribution of Dissolved Copper in Coastal Surface Seawater of Japan.
口頭発表（一般）
- 第23回日本環境毒性学会研究発表会シンポジウム「海洋汚染」, 2017年09月, 日本語, 東洋大学, 国内会議船底防汚剤と海洋汚染
[招待有り]
口頭発表（招待・特別）
- 日本環境毒性学会, 2017年09月, 日本語, 東洋大学, 国内会議沿岸海水中の溶存態銅のモニタリング及びMarine BLMを用いた有害性評価
口頭発表（一般）
- The 14th International Symposium on Persistent Toxic Substances, 2017年09月, 英語, Nagoya（Aichi), 国際会議Distribution of perfluoroalkyl acids from Osaka Bay to coastal waters of Western Japan
口頭発表（一般）
- Pollution Control Congress (PCC) 2017., 2017年07月, 英語, Melbourne, Australia, 国際会議Water stability of a new antifouling biocide tralopyril and its toxicity to freshwater algae Pseudokirchneriella subcapitata.
口頭発表（一般）
- 日本水環境学会, 2017年03月, 日本語, 熊本大学, 国内会議日本沿岸の表層海水中の溶存態ニッケルの分布
口頭発表（一般）
- International Conference on Emerging Trends in Environmental Engineering and Control (ICETEEPC) 2017, 2017年03月, 英語, Beijing, China, 国際会議The Interactive effect of salts and copper pyrithione on a brine shrimp survival.
口頭発表（一般）
- 第22回日本環境毒性学会, 2016年09月, 日本語, 愛媛大学, 国内会議溶出試験による漁網防汚塗料から海水に溶出した銅が海産藻類に及ぼす影響.
口頭発表（一般）
- 第84回マリンエンジニアリング学術講演会 講演論文集 pp.155-156, 2014年11月, 日本語, 下関市，海峡メッセ下関, 国内会議ジメチルエーテル混合C重油燃料を用いた舶用機関からの排ガスが水生生物に及ぼす影響
口頭発表（一般）
- 日本マリンエンジニアリング学会 海洋環境研究委員会第3回ワークショップ, 2013年09月, 日本語, 神戸大学, 国内会議天然海水中でのピリチオン防汚剤と銅イオンが塩水性甲殻類に及ぼす影響
口頭発表（一般）
- 第83回マリンエンジニアリング学術講演会 講演論文集 pp.107-108, 2013年09月, 日本語, 静岡、日本, 国内会議DME混合燃料由来のディーゼル排ガス微粒子の変異原性評価
口頭発表（一般）
- 立命館大学SRセンター研究成果報告会, 2013年06月, 日本語, 立命館大学, 国内会議閉鎖性水域における環境改善材料のXAFSによる性能評価
[招待有り]
口頭発表（招待・特別）
- 第73回分析化学討論会, 2013年05月, 日本語, 北海道大学, 国内会議好気・嫌気環境の繰り返しによる石炭灰造粒物への硫化物イオンの吸着機構の解明
ポスター発表
- 第47回日本水環境学会, 2013年03月, 日本語, 大阪工業大学, 国内会議野外水槽を用いた炭酸化製鋼スラグによる閉鎖性水域の底質改善効果の検証
口頭発表（一般）
- 第47回日本水環境学会, 2013年03月, 日本語, 大阪工業大学, 国内会議炭酸化製鋼スラグを用いた底質改善方法における底生生態系への影響評価
口頭発表（一般）
- 第47回日本水環境学会, 2013年03月, 日本語, 大阪工業大学, 国内会議炭酸化製鋼スラグの硫化物イオン除去メカニズム
口頭発表（一般）
- 17th Hiroshima International Symposium on Synchrotron Radiation, 2013年03月, 英語, Hiroshima University, 国際会議Oxidation mechanisms of hydrogen sulfide on the surface of manganese oxside in granulated coal ash
ポスター発表
- 日本分析化学会広島地区分析技術講演会, 2013年02月, 日本語, 広島大学, 国内会議産業系リサイクル材料各種による閉鎖性水域の環境改善効果の比較
口頭発表（招待・特別）
- 4th IWA Young Water Professional Conference 2012, 2012年12月, 英語, Tokyo, 国際会議Remediation of eutrophic sediments using industrial byproducts
口頭発表（一般）
- 第82回マリンエンジニアリング学術講演会 講演論文集 pp.59-60, 2012年09月, 日本語, 日本マリンエンジニアリング学会/The Japan Institute of Marine Engineering, 高松市, 国内会議ジャトロファ油由来のディーゼル排ガス微粒子に吸着する有害物質
口頭発表（一般）
- 第82回マリンエンジニアリング学術講演会 講演論文集 pp.61-62, 2012年09月, 日本語, 日本マリンエンジニアリング学会/The Japan Institute of Marine Engineering, 高松市, 国内会議ジャトロファ油由来のディーゼル排ガス微粒子に吸着するニトロ化PAHs
口頭発表（一般）
- 16th International Congress on Marine Corrosion and Fouling, 2012年06月, 英語, Seattle, USA, 国際会議Abnormal duckweed fronds occurred by metal pyrithione.
ポスター発表
- 第81回マリンエンジニアリング学術講演会 講演論文集 pp.49-50, 2011年05月, 日本語, 日本マリンエンジニアリング学会, 東京都, 国内会議ディーゼル排気微粒子の環境毒性に及ぼすDMEの添加効果
口頭発表（一般）
- 第2回ワークショップ「船底塗料と海洋環境に関する最新の話題」, 2011年, 日本語, 日本マリンエンジニアリング学会, 千葉工業大学, 国内会議誘導体化HPLC法によるピリチオン化合物の定量
口頭発表（一般）
- 第81回マリンエンジニアリング学術講演会, 2011年, 日本語, 日本マリンエンジニアリング学会, 東京海洋大学, 国内会議水環境中におけるトリフェニルボラン防汚剤の運命に及ぼす光の影響
口頭発表（一般）
- 第17回日本環境毒性学会, 2011年, 日本語, 日本環境毒性学会, 鹿児島大学, 国内会議ピリチオン防汚剤がウキクサ葉状体に及ぼす影響
口頭発表（一般）
- 第80回マリンエンジニアリング学術講演会 講演論文集 pp.55-56, 2010年08月, 日本語, 日本マリンエンジニアリング学会, 新潟（朱鷺メッセ）, 国内会議船舶ディーゼル排ガス由来粒子状物質の変異原性評価
口頭発表（一般）
- 日本海水学会第61年会, 2010年, 日本語, 日本海水学会第61年会, 石巻専修大学, 国内会議重金属イオンが防汚剤トリフェニルボランピリジン（TPBP）の運命に及ぼす影響
口頭発表（一般）
- 第80回マリンエンジニアリング学術講演会, 2010年, 日本語, 日本マリンエンジニアリング学会, 朱鷺メッセ, 国内会議広島湾北部海域における有機スズ代替化合物汚染とカキに与える影響
口頭発表（一般）
- 第80回マリンエンジニアリング学術講演会, 2010年, 日本語, 日本マリンエンジニアリング学会, 朱鷺メッセ, 国内会議バイオアッセイによる港湾表層底質の汚染評価
口頭発表（一般）
- ワークショップ「船底塗料と海洋環境に関する最新の話題」, 2009年11月, 日本語, 日本マリンエンジニアリング学会, 函館, 国内会議遺伝子マーカーによる船体付着藻類の多様性解析
口頭発表（一般）
- 14th International Symposium on Toxicity Assessment., 2009年09月, 英語, Metz, France, 国際会議ECOTOXICITY ASSESSMENT OF NEW BIOCIDE-FREE ANTIFOULING PAINTS.
ポスター発表
- ワークショップ船底塗料と海洋環境に関する最新の話題講演集., 2009年, 日本語, 函館, 国内会議底質コアサンプル中の船底防汚剤分布.
口頭発表（一般）
- 第79回マリンエンジニアリング学術講演会講演論文集. 161-162., 2009年, 日本語, メルパルク広島, 国内会議船舶ディーゼル排ガス由来粒子状物質に吸着した有害化学成分に関する研究.
口頭発表（一般）
- 日本海水学会第60年会講演要旨集. pp.16-17., 2009年, 日本語, 東大, 国内会議船底用および漁網用防汚剤の水環境における運命.
口頭発表（一般）
- ワークショップ船底塗料と海洋環境に関する最新の話題講演集., 2009年, 日本語, 函館, 国内会議水環境におけるトリフェニルボラン防汚剤の生態影響評価.
口頭発表（一般）
- 第79回マリンエンジニアリング学術講演会講演論文集. 163-164., 2009年, 日本語, メルパルク広島, 国内会議海産発光細菌を用いた港湾底質の汚染評価.
口頭発表（一般）
- ワークショップ船底塗料と海洋環境に関する最新の話題講演集., 2009年, 日本語, 函館, 国内会議キャピラリーゾーン電気泳動法によるピリジントリフェニルボラン及び分解生成物の同時定量.
口頭発表（一般）
- 第79回マリンエンジニアリング学術講演会講演論文集. 165-166., 2009年, 日本語, メルパルク広島, 国内会議カキ発生に与える有機スズ代替船底防汚剤の影響.
口頭発表（一般）
- 14th International Symposium on Toxicity Assessment.62., 2009年, 英語, Metz, France, 国際会議THE INFLUENCE OF ORGANOTIN ALTERNATIVE ANTIFOULANTS ON THE OYSTER’S EMBRYOLOGY.
ポスター発表
- 5th SETAC World Congress, 2008年08月, 英語, Sydney, Australia, 国際会議Fate of triphenylborane-pyridine antifouling agent in sediments (POSTER).
口頭発表（一般）
- 14th International Congress on Marine Corrosion and Fouling., 2008年07月, 英語, 神戸, 国際会議Triphenylborane-pyridine antifouling agent degrades by metal ions? (POSTER)
ポスター発表
- 14th International Congress on Marine Corrosion and Fouling., 2008年07月, 英語, 神戸, 国際会議Simultaneous determination of pyridine triphenylborane (TPBP) antifouling agent and its estimated degradation products by capillary zone electrophoresis (POSTER).
口頭発表（一般）
- 14th International Congress on Marine Corrosion and Fouling., 2008年07月, 英語, 神戸, 国際会議Contamination of organotin alternative antifoulants in coastal seawater and sediment of Hiroshima Bay (POSTER).
口頭発表（一般）
- 2008年度日本付着生物学会研究集会, 2008年04月, 日本語, 東京海洋大学, 国内会議新規防汚剤の環境影響.
口頭発表（招待・特別）
- 日本マリンエンジニアリング学術講演会, 2008年, 日本語, 国内会議船舶ディーゼル排ガス由来微粒子が動植物プランクトンに及ぼす影響評価.
口頭発表（一般）
- 13th International Symposium on Toxicity Assessment., 2007年08月, 英語, 富山, 国内会議Ecotoxicity reduction of leachates from model waste columns using permeable reactive barrier (PRB) (POSTER). 119.
口頭発表（一般）
- 13th International Symposium on Toxicity Assessment., 2007年08月, 英語, 富山, 国内会議Degradation products of triphenylborane-pyridine antifouling agent in water (ORAL).
口頭発表（一般）
- 13th International Symposium on Toxicity Assessment., 2007年08月, 英語, 富山, 国内会議Consideration of salinity in the evaluation of landfills and solid wastes using aquatic and terrestrial higher plant test (POSTER). 121.
口頭発表（一般）
- 13th International Symposium on Toxicity Assessment., 2007年08月, 英語, 富山, 国内会議An evaluation of some PAHs in seawater of the Seto Inland Sea and the Pacific Ocean near west Japan (POSTER). 112.
口頭発表（一般）
- 平成19年度日本水産学会近畿支部シンポジウム-近畿の水環境の現状とその制御に向けて., 2007年07月, 日本語, 神戸女学院大学, 国内会議「トリブチルスズ代替防汚剤による沿岸域の汚染とバイオアッセイを用いた毒性評価」講演要旨集 9.
口頭発表（招待・特別）
- 2nd Oxford Kobe Institute International Maritime Seminar: Sustainable Maritime Transport., 2007年06月, 英語, Kobe Institute, 国内会議Protection of Marine Environment. Man-made chemicals used on ship hulls on purpose.
口頭発表（招待・特別）
- SETAC Europe 17th Meeting, 2007年05月, 英語, Porto, Portugal, 国際会議Acute toxicity of the ash from a gasification test plant on earthworm survival (POSTER).
口頭発表（一般）
- 第40回日本水環境学会年会, 2007年03月, 日本語, 大阪産業大学, 国内会議瀬戸内海及び太平洋におけるPAHｓの濃度レベルのモニタリング第40回日本水環境学会年会講演集.
口頭発表（一般）
- 平成18年度中国四国地域産業廃棄物処理等技術研修会, 2006年10月, 日本語, 岡山県生涯学習センター, 国内会議浸出水対策のための浸出水の毒性評価
口頭発表（招待・特別）
- 世界自然保護基金ジャパン 講演会, 2006年09月, 日本語, 環境省国際サンゴ礁研究モニタリングセンター、沖縄県石垣市, 国内会議「サンゴと化学物質」「バイオサイドとは？－沿岸域汚染の現状と環境管理」
口頭発表（招待・特別）
- 第12回環境毒性学会講演, 2006年09月, 日本語, 北里大学, 国内会議ウキクサ葉状体の異常を指標とした浸出水中の化学物質の影響評価.52. 第12回環境毒性学会講演要旨集.
口頭発表（一般）
- 日本海水学会第57年会研究技術発表会講演, 2006年05月, 日本語, 高松, 国内会議水中での硝酸ミコナゾールの光分解性評価(Oral).
口頭発表（一般）
- 第40回日本水環境学会年会, 2006年03月, 日本語, 仙台, 国内会議瀬戸内海と太平洋における海水中の多環芳香族炭化水素濃度の比較.
口頭発表（一般）
- 第40回日本水環境学会年会講演集., 2006年03月, 日本語, 宮城県仙台市, 国内会議瀬戸内海と太平洋における海水中の多環芳香族炭化水素濃度の比較.
口頭発表（一般）
- 第40回日本水環境学会年会, 2006年03月, 日本語, 仙台, 国内会議高等植物における生長評価エンドポイントの検討.
口頭発表（一般）
- 第40回日本水環境学会年会講演集., 2006年03月, 日本語, 宮城県仙台市, 国内会議高等植物における生長評価エンドポイントの検討.
口頭発表（一般）
- 2nd Asia Pacific International Symposium on Air and Water Treatments by green oxidation/reduction technologies-catalyst plasma and hybrid systems, 2006年, 英語, Dalian, China, 国際会議The impacts on marine environments by the biocides in ship antifouling paints.
口頭発表（一般）
- The Progre of Green Oxidation/Reduction Technology, 2006年, 英語, 国際会議The impacts on marine environments by the biocides in ship antifouling paints
口頭発表（一般）
- Abstracts of International Symposium on Extremophiles and Their Applications, pp. 362, 2005年11月, 英語, Tokyo, Japan, 国際会議Effect of salt concentration on bioluminescence of Vibrio fischeri: Applications on screening for quorum sensing inhibitors
ポスター発表
- Abstracts of Pacem In Maribus XXXI Conference, pp. 108, 2005年10月, 英語, Queensland, Australia, 国際会議Single and joint toxicity of some new antifoulants against Vibrio fischeri by bioluminescent assay
口頭発表（一般）
- Abstracts of the Conference on Health and Biodiversity 2005, pp. 98, 2005年08月, 英語, Galway, Ireland, 国際会議Luminescent bioassay using Vibrio fischeri to assess the pollution of antifoulants
口頭発表（一般）
- 第39回日本水環境学会年会, 2005年03月, 日本語, 千葉, 国内会議有機ホウ素系船底防汚剤が水生生物に及ぼす影響(Oral).
口頭発表（一般）
- 第39回日本水環境学会年会, 2005年03月, 日本語, 千葉, 国内会議広島県北部における有機スズ代替船底防汚剤による底質の汚染状況 (Poster).
口頭発表（一般）
- 廃棄物学会2005年会, 2005年, 日本語, 仙台、宮城県, 国内会議浸出水中の亜鉛が水生植物ウキクサに及ぼす影響.
口頭発表（一般）
- 日本水産学会, 2005年, 日本語, 高知, 国内会議岩手県大槌湾におけるムラサキイガイと底泥を用いた重金属調査
口頭発表（一般）
- 12th International Symposium on Toxicity Assessment, 2005年, 英語, Skiathos, Greece, 国内会議Toxicity reduction of metal pyrithiones by near ultraviolet irradiation.
ポスター発表
- 12th International Symposium on Toxicity Assessment, 2005年, 英語, Skiathos, Greece, 国際会議Toxicity assessment of the sediments around dockyards using marine algal test.
ポスター発表
- 10th International Waste Management and Landfill Symposium, 2005年, 英語, Sardinia, Italy, 国際会議Phytotoxic effects of landfill leachate in Japan.
口頭発表（一般）
- 12th International Symposium on Toxicity Assessment, 2005年, 英語, Skiathos, Greece, 国際会議PAHs level in seawater of the Seto Inland Sea and the Pacific Ocean near West Japan.
ポスター発表
- 12th International Symposium on Toxicity Assessment, 2005年, 英語, Skiathos, Greece, 国際会議An examination on oxidative decomposition of esterogen like substances using photocatalyst.
ポスター発表
- OCEANS ‘04 MTS/IEEE/TECHNO-OCEAN’04., 2004年11月, 英語, 神戸, 国内会議Effects of new antifouling biocides on marine plankton.
口頭発表（一般）
- OCEANS ‘04 MTS/IEEE/TECHNO-OCEAN’04., 2004年11月, 英語, 神戸, 国内会議Antibacterial activity of the marine sponge Psammaplysilla purpurea: Importance of its surface-associated bacteria (ORAL).
口頭発表（一般）
- 中日水環境修復学術研究発表会. トヨタ財団助成国際共同研究 ファイトレメディエーションによる水質浄化, 2004年09月, 日本語, 無錫市、中国, 国際会議「船舶塗料の水環境に対する影響」
口頭発表（招待・特別）
- 第13回環境化学討論会, 2004年07月, 日本語, 静岡県立大学, 国内会議代替船底塗料物質による海域の汚染状況について (Oral).
口頭発表（一般）
- 日本海水学会第55年会研究技術発表会, 2004年06月, 日本語, 岡山, 国内会議バイオアッセイを用いた代替防汚剤の分解性の評価.
口頭発表（一般）
- SETAC Europe 14th Annual Meeting, 2004年04月, 英語, Prague, Czech Republic., 国際会議Ecotoxicity of landfill leachates using a battery of bioassay.
口頭発表（一般）
- 神戸大学海事科学部プロジェクト研究報告会, 2004年03月, 日本語, 神戸, 国内会議“新”神戸大学における｢海事科学部｣と｢内海域環境教育研究センター｣の連携に関する調査・研究
口頭発表（一般）
- 日本マリンエンジニアリング学会船底防汚塗料研究委員会 第3回研究会講演要旨集pp.1-4, 2004年, 日本語, 日本マリンエンジニアリング学会 船底防汚塗料研究委員会, 未記入, 国内会議代替防汚剤の環境影響評価
口頭発表（招待・特別）
- 第38回日本水環境学会年会講演集 pp.33, 2004年, 日本語, 日本水環境学会, 札幌コンベンションセンター, 国内会議瀬戸内海と太平洋における海水中の多環芳香族炭化水素濃度レベルについて
口頭発表（一般）
- 第38回日本水環境学会年会講演集 pp.92, 2004年, 日本語, 日本水環境学会, 札幌コンベンションセンター, 国内会議海産動植物プランクトンに及ぼす新規防汚剤の影響評価
その他
- Proceedings in International Symposium on Antifouling Paint and Marine Environment, 2004年, 英語, 未記入, 未記入, 国際会議Photosensitized degradation of Irgarol 1051 in water
口頭発表（一般）
- 第6回日本水環境学会シンポジウム講演集p.225, 2003年09月, 日本語, 日本水環境学会・身近な生活環境研究委員会, 神戸女学院大学, 国内会議船底防汚塗料バイオサイドによる沿岸域汚染
口頭発表（一般）
- 平成15年度日本水産学会近畿支部シンポジウム「有機スズ化合物問題その後と新規防汚剤開発の動向」講演集 pp.5, 2003年07月, 日本語, 日本水産学会近畿支部, 近畿大学農学部, 国内会議新規防汚剤の生態影響
口頭発表（招待・特別）
- 第18回環境科学会セミナー「化学物質が生態系に及ぼす影響に関する研究展開と国内法制化の動向」講演集 pp.73-87, 2003年05月, 日本語, 未記入, 神戸商船大学, 国内会議船体防汚剤の生態影響研究
口頭発表（招待・特別）
- 第37回日本水環境学会年会講演集. 268., 2003年03月, 日本語, 熊本県立大学, 国内会議代替船底塗料物質による海域の汚染状況について
口頭発表（一般）
- 「バイオアッセイ実習セミナー」, 2003年03月, 日本語, 熊本県立大学., 国内会議生態毒性試験
口頭発表（招待・特別）
- Second International Workshop on Bioassay of the Marine Environment in the Northwest Pacific Region., 2003年03月, 英語, Toyama., 国内会議Environmental risk assessment of new antifouling compound.
口頭発表（招待・特別）
- 日本海水学会海水のフロンティア技術シンポジウム講演要旨集 pp.21-24, 2003年, 日本語, 日本海水学会西日本支部, 四国電力㈱総合研修所, 国内会議有機スズ代替防汚剤と沿岸域環境
口頭発表（招待・特別）
- 平成14年度環境省廃棄物処理等科学研究費補助金「最終処分場管理におけ化学物質リスクの早期警戒システムの構築」研究報告書 p.8-1～8-13, 2003年, 日本語, 未記入, 未記入, 国内会議生態毒性試験バッテリーの確立
その他
- 科学研究費補助金助成基盤研究C(2)（課題番号11680530）研究成果報告書 p.98, 2003年, 日本語, 未記入, 未記入, 国内会議水環境における新規防汚剤の運命及び生態影響
その他
- 環境科学会2003年会講演論文集 pp.56-57, 2003年, 日本語, 環境科学会, 東京大学駒場キャンパス, 国内会議最終処分場浸出水が動物に及ぼす影響評価
口頭発表（一般）
- 廃棄物学会2003年会講演論文集, 2003年, 日本語, 廃棄物学会, 未記入, 国内会議最終処分場浸出水が植物に及ぼす影響評価
口頭発表（一般）
- ソルトサイエンス研究財団第15回助成研究発表会要旨集 pp.39, 2003年, 日本語, ソルトサイエンス研究財団, 未記入, 国内会議バイオアッセイを活用した新規防汚剤の分解性評価
口頭発表（一般）
- Proceedings in SETAC Asia/Pacific and ASE 2003, 2003年, 英語, 未記入, 未記入, 国際会議Photosensitized degradation of Irgarol 1051 in freshwater
口頭発表（一般）
- 第13回廃棄物学会研究発表会, 2002年11月, 日本語, 国立京都国際会館, 国内会議新規船底防汚剤Irgarol 1051の毒性及びbioavailablity評価.
口頭発表（一般）
- 第47回リグニン討論会., 2002年10月, 日本語, アクロス福岡国際会議場, 国内会議リグニン分解酵素によるIrgarolの分解
口頭発表（一般）
- 第36回日本水環境学会年会, 2002年, 日本語, 岡山大学, 国内会議ウニ卵を用いた生物検定による汚染原因物質の推定-重金属の場合
口頭発表（一般）
所属学協会
共同研究・競争的資金等の研究課題
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 2018年04月01日 - 2021年03月31日, 研究代表者
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 2017年04月01日 - 2020年03月31日
本年度は，液化ジメチルエーテル（DME）を連続混合する装置製作の基礎実験として，液化DMEと木タールの混合燃料の流動特性を調べ，既得の加圧型定容容器混合装置を使用して噴霧特性解析及び燃焼特性解析を行なった。 昨年度は木タール単体の流動特性を解析し，その結果，供試木タールの粘度範囲は比較的軽質な重油と同程度であることを得た。今年度は木タールに液化DMEを30wt.%混合した燃料について，密封式のセルに封入した毛細管式粘度計で流動特性を計測した。その結果，木タールの粘度は液化DMEを混合することで大幅に低下し，わずかな過熱でエンジン燃料として使用できる可能性を明らかにした。そこで，この混合割合を条件として連続混合装置の追加設計を行ない，本年度は加圧条件下で攪拌実験装置を使用できる容器部分を製作した。 つぎに液化DME混合木タール燃料の微粒化特性を解析するために，既得の単発燃料噴射装置を使用して，大気雰囲気場における燃料噴霧の拡散状況を調べた。揮発するDMEを可視化するためにシュリーレン光学系を用いて，高速度ビデオカメラによって拡散画像を撮影した。その結果，液化DMEを混合した場合，噴霧周辺に揮発するDMEが広範囲に分散し，噴霧体積が著しく増大するという結果を得た。今後はさらに詳細な噴霧特性の解析を行なっていく予定である。 また液化DME混合時における燃料の燃焼特性について，定容量燃料混合装置を使用して液化DME混合燃料を調製し，予備的な燃焼解析を行なった。木タールに液化DME30wt.%を混合した試験油について，燃焼試験を実施した。エンジン試験の途上，不完全燃焼成分の生成によって運転性能が安定せず，今年度は十分な燃焼解析を行なうことができなかった。今後は吸気温度の高温化，燃料噴射圧力の高圧化などの燃焼改善対策を行なって，燃焼試験を実施していく必要がある。
競争的資金
- 日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 神戸大学, 2016年11月07日 - 2019年03月31日, 研究代表者
１、新規防汚剤トラロピリル（TLP）の水中での安定性を評価した。水中のTLPとその主要な分解産物CLを分離定量する方法を、蛍光検出器付HPLCを用いて開発した。人工海水中のTLPの半減期は高水温および高pH条件下でより短く、酸性下では分解しなかった。太陽光近紫外線（UVA)は海水中のTLPの分解に影響しなかったが、天然淡水中でのTLPの分解を促進した。TLPは分解に伴ってCLを生成し、CLはUVA照射によって分解した。 ２、水生生物に対してTLPおよび防汚剤の亜鉛ピリチオン（ZnPT）は強い阻害を示したが、TLPの分解産物による阻害は極めて弱かった。藻類増殖に対するTLPの有害性は経時的に減少したことから、TLPは暴露初期に迅速に分解したと考えられた。カキの幼生に対してTLPは強い影響を及ぼした。１時間暴露でのウニ受精率に対するTLPのEC50は、ZnPTに比較して８倍程度であり、48時間暴露後の発生に対するTLPのEC50は、ZnPTの５倍程度であった。このようにウニの受精・発生に対しては、TLPよりもZnPTの方が強い影響を示した。 ３、防汚剤の銅ピリチオン(CuPT)の分解産物であるHPTは、銅イオンが存在すると容易にCuPTを生成した。有機物フリーで塩分濃度が高い海水中では、CuPTは塩水性甲殻類に対して強い急性致死影響を示した。CuPTの毒性は供試海水中の有機物濃度、塩分濃度だけでなく、塩類組成によっても有意に影響を受けることを明らかにした。TLPおよびZnPTがそれぞれ銅と共存した場合のウニの受精・発生に対する影響を評価した。１時間暴露でのウニ受精率に対するTLPの毒性に対して、銅は有意な影響を及ぼさなかった。一方、ZnPTの毒性は銅が共存した場合には10倍程度増強し、銅イオンがZnPTと反応してより毒性の強いCuPTを生成したと考えた。
競争的資金
- 日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 神戸大学, 2013年04月01日 - 2015年03月31日, 研究代表者
次世代舶用燃料（ジメチルエーテルを30％混合したC重油）からの排気ガスを人工海水等に吹き込み、この溶液が水生生物に及ぼす有害性を評価し、粒子状物質に吸着した有害成分に関する知見を得た。C重油および次世代燃料からの排ガスを吹き込んだ人工海水はどちらも海産藻類に対して有害性を示し、孔径0.1 μmの膜フィルターでろ過すると海産藻類に対する有害性が消失したことから、有害成分は0.1～1μmの粒子に吸着していると考えられた。C重油排ガスを吹き込んだ人工海水中の0.1～1μmの粒子には発がん性を有するPAHsが検出されたが、次世代燃料排ガスからの試料には発がん性物質は検出されなかった。
競争的資金
- 日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 神戸大学, 2010年 - 2012年, 研究代表者
次世代燃料を用いた船舶ディーゼルエンジンからの排ガス中の粒子状物質(PM)が海洋生態系に及ぼす有害影響をバイオアッセイにより評価し、PMに吸着する有機有害成分とアニオンの関連性を評価した。C重油や A重油に比較すると、ジャトロファ油からのPM排出量は低く、海産生物への有害性は低く、変異原性も低かった。C重油や A重油にジメチルエーテル(DME)を添加した燃料では、DME添加によって減少した燃料の量に見合う有害性の低減は必ずしも認められなかった。
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 2008年 - 2011年, 研究代表者
海事活動の盛んな港湾部の底質汚染を環境生物を用いたバイモニタリング手法を用いて評価したところ、底質の汚染は海産発光細菌を用いて定量的に評価することができた。港湾底質中に残留する有害化学物質として、有機スズ代替防汚剤および石油や排ガス由来の多環芳香族炭化水素化合物を対象としたが、これらの化学物質によって毒性を説明することは困難であった。このことは、港湾底質に残留し、水生生物に影響を及ぼす有害化学物質が多種多様であることを示している。
競争的資金
- 三井物産環境基金, 研究助成, 2008年 - 2010年, 研究代表者閉鎖性海域における化学物質の蓄積と海洋生物に与える影響
競争的資金
- 日本学術振興会, 科学研究費助成事業 挑戦的萌芽研究, 挑戦的萌芽研究, 神戸大学, 2008年 - 2009年, 研究代表者
1.船舶排ガス由来粒子状物質(SDEP)中の多環芳香族炭化水素(PAH)およびニトロ化PAH(NPAH)の定量 フォークリフトディーゼルエンジン由来の粒子状物質(標準試料:SRM2975)を供試し、ジクロロメタンを抽出溶媒として高速溶媒抽出装置を用いて有機溶媒可溶画分(SOF)を調製し、アミノプロピルカラムおよびアミノプロピルHPLCカラムを用いた2段階処理の後、15種類のPAHおよび11種類のNPAHをそれぞれ定量する分析方法を確立した。標準試料の他に、(1)A重油を燃料とした本学部練習船の煙突付着スス、(2)C重油を燃料とした実験エンジンIの冷却器内部付着スス、(3)A重油を燃料とした実験用エンジンIIからのSDEP、(4)植物油を燃料とした実験用エンジンIIからのSDEPを供試した。総PAH量が多かったのは、(3)>(4)=(2)>(1)の順であった。分析対象としたNPAHの中で検出されたのは1-nitropyreneのみであり、量が多かった順に(2)>(1)>(4)>(3)であった。 2.SDEPが海洋生態系に及ぼす影響および化学的・毒性学的特性の評価 海産発光細菌に対して、4種類のSOFの中で(1)のみが有意な阻害を示した。一方、Salmonella typhimurium NM2009株を用いた変異原性試験では、試料(1)と(2)が直接変異原性を示し、(2)は間接変異原性も示した。変異原性を示した試料(2)、および(2)から調製したSOFにそれぞれ紫外線UV-Cを8時間照射した。SOFに紫外線を照射して8時間後には全PAHの99.9%が分解したが、変異原性に顕著な減少は認められず、また発光細菌への阻害は逆に強まった。スス粒子そのものに同じ強度の紫外線を8時間照射しても、PHA量、変異原性に顕著な減少は認められなかった。以上のことから、紫外線照射によってSDEPに付着する有機有害成分の生物活性を消去することは困難であると推測された。
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 2004年 - 2007年, 研究代表者
新規防汚剤Triphenylborane-pyridine(TPBP)を対象物質として、船底塗料から海水中に溶出した本物質の環境内運命を、特に底質中での挙動や分解産物の毒性の観点から評価した。本物質は海水中の微生物によって比較的容易に分解してphenolとbiphenylを生成し、UV-A照射によっても分解して同じ2種類の分解産物を生成した。本物質は底質への吸着力が強く、いったん吸着した底質から容易には脱着しないことが示された。また、底質に吸着したTPBPは前記の2種類の分解産物を生成した。これら2種類の分解産物の生態毒性はTPBPと比較すると弱かった。以上の結果から、本物質は船底塗料から海水に溶出すると太陽光分解を受けながら底質へ移行し、底質中の有機物に吸着すると共に分解して分解産物を生成する。太陽光が入射する海水中ではTPBPの環境リスクは低いと推測されたが、有機物量の少ない底質に移行したTPBPは底生生物に対して悪影響を及ぼす可能性が懸念された。 港湾底質の毒性を評価するため、海産発光細菌Photobacterium leiognathi SBを用いたTOX Screen II試験を改変した。本細菌を港湾底質に直接暴露し、底質の濁りによる影響を除外した方法により、底質の湿重量を元に算出した50%発光阻害濃度を用いて供試底質の毒性を定量的に評価した。大槌湾底質には毒性が認められず、舞鶴湾底質の数試料で比較的強い毒性が認められたのに対し、大阪湾底質では極めて強い毒性が観察された。毒性の強い底質試料の強熱減量は高い傾向にあり、観察された毒性と防汚剤や有機有害物質の残留との関連に興味がもたれた。
競争的資金
- 造船学術研究推進機構, 研究助成, 2004年 - 2006年, 研究代表者太陽光と光触媒を用いたバラスト水の殺菌に関する研究
競争的資金
- 2006年, 研究代表者廃棄物処分場の有害物質の安全・安心保障
競争的資金
- 2005年, 研究代表者廃棄物処分場の有害物質の安全・安心保障
競争的資金
- 科学研究費補助金／基盤研究(B), 2005年
競争的資金
- 鉄鋼業環境保全技術開発基金, 平成15年度一般研究助成, 2003年 - 2003年, 研究代表者沿岸域底質の汚染評価
競争的資金
- ひょうご科学技術協会, 研究助成, 2003年 - 2003年, 研究代表者バイオアッセイを活用した沿岸海洋環境の診断
競争的資金
- クリタ・水環境科学振興財団, 平成14年度研究助成, 2002年 - 2002年, 研究代表者新規船底防汚剤が海産プランクトンに及ぼす影響評価
競争的資金
- ソルト・サイエンス研究財団, 研究助成, 2002年 - 2002年, 研究代表者バイオアッセイを活用した新規防汚剤の分解性評価
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(C), 基盤研究(C), 1999年 - 2002年, 研究代表者水環境における新規防汚剤の運命および生態影響
我が国で使用されていると考えられる数種類の新規防汚剤を供試し、以下の課題に取り組んだ。 1.新規防汚剤による我が国水環境の汚染 瀬戸内海を中心とした西日本沿岸海域の港湾海水中での防汚剤の残留分析を行った。海水中の最高濃度は、Irgarol 1051が0.30μg/L、M1が1.9μg/L、Diuronが3.1μg/Lであった。定点における3年間にわたる調査結果から、残留濃度は概して高い順にDiuron>Irgarol 1051>M1であった。 2.分解性評価 Irgarol 1051が水銀イオンによって触媒される加水分解により分解し、分解産物M1を生成した。Irgarol 1051は太陽光によっても分解し、分解産物M1を生成した。太陽光下での分解速度は天然水中で早く、腐植物質による光増感分解が示唆された。Irgarol 1051およびDiuronを含む市販塗料を用いた実験から、我が国沿岸海水に検出されたDiuron, Irgarol 1051, M1は市販塗料に由来することを確認した。 3.生態系影響評価 Irgarol 1051とその分解産物M1について、細菌、微細藻類、海藻、ウキクサ、甲殻類、陸生植物に対する影響を定量的に評価し、残留濃度と比較することによってIrgarol 1051の環境リスクを評価した。数種類の新規防汚剤について、魚類の生死および細胞増殖、ウニ受精卵の発生、3種類の非標的植物の増殖に対する影響を評価した。魚類試験では28日間の初期生活段階試験と24時間の浮遊培養細胞試験を実施した。金属ピリチオン化合物の毒性が全ての生物に対して強く、特にウニ受精卵に対する影響が極めて強かった。UV-Aランプを用いて光分解処理した金属ピリチオン化合物はワムシとウニに対する毒性が減少したので、金属ピリチオン化合物は容易に光分解したと考えた。
競争的資金
- 日本学術振興会, 科学研究費助成事業 特定領域研究(A), 特定領域研究(A), 岡山大学, 2001年 - 2001年農薬及びその由来物質によるヒメダカ誘導蛋白をバイオマーカーとする評価系の開発
新規船底塗料材イルガロール(Irgarol 1051:2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazin)は、我が国で除草剤として使用されているs-triazine系化合物atrazine, simazine, simetrynなどと同じ仲間である。本物質は1993年以降、地中海北部・西部沿岸、イギリス東部・南部沿岸、スイス、スウエーデン、ドイツにおいて、海水、湖水、底質、生物等の環境試料中の残留分析が報告されている。1999年には、瀬戸内海およびオーストラリアの北東部沿岸においても残留が報告されたので、イルガロールはヨーロッパだけでなくアジアやオセアニアにおいても、防汚剤として使用されていると考えられる。メダカに誘導されるビテロジェニンに関しての評価を適用した。濃度0.1mg/Lのイルガロール溶液を0.69mL/minの流速で連続的に流し、ヒメダカ雄成魚15尾を1000mL容ガラス製ビーカー内で飼育しながら14日間曝露した。曝露濃度は、96時間急性毒性試験の結果に基づき決定した。曝露試験は1日16時間の光照射の条件の下で25±1℃の恒温室内で行い、1日1回給餌を行った。曝露期間中、7日目および14日目に採血を行い血清を採取した。この血清を用いて電気泳動した後、全タンパクの非特異的検出を行うCBB染色とヒメダカビテロジェニン抗体による抗原抗体反応を利用したビテロジェニンの特異的検出を行った。特異的検出にはWestern blottingを行った。Western Blottingにメダカ雄に、7日間、14日間でビテロジェニンの誘導がみられた。14日曝露の方がより強く誘導され、ビテロジェニンがイルガロールによって誘導されていることが示された。現在、再現試験を行うと共に、ビテロジェニンの定量を行った。
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(C), 基盤研究(C), 岡山大学, 1999年 - 2001年環境ホルモン汚濁水の植物活用バイオプリベンション研究
環境ホルモン様物質として約70種類の化学物質(農薬、有機化学物質、重金属等)が指摘されているが、その作用性(作用メカニズムや生態撹乱現象)についても不明の部分が多い。環境ホルモン自体についても、その特定と確認の緒についたばかりといえる、今後も多くの化学物質が指摘される可能性もある。したがってこれらの汚濁の現状と汚濁を想定した環境防御に関する基礎的研究は重要な課題である。主な研究成果は次のようである。 1)特に未利用植物の有効活用法を検討すべく、フィールド調査および曝露実験による基礎研究を進めている。先に数種類の植物体の選抜実験により、有害金属と界面活性剤の共存時における水中Al,Ni,Cd,Hg等の収奪力の大きい植物(シュロガヤツリ、ホテイアオイ等)を選抜し、製紙原料等への後利用も考慮して密植が可能でバイオマスも大きいシュロガヤツリが有効である事を確認した(S.Muramotoal.2000,Bull.Environ.Contam.Toxicology,64:122-129)。 他にシナノキ科の黄麻子などの繊維作物も穀物袋などへの原料としても考えられる。 2)同時に植物幼苗において環境ホルモン様物質のBenomyl, Atrazineの汚濁水に対して、シソ科(Ocimum basilicum)、アブラナ科(Var.botortis)、キク科(Chrisanthmum)、シナノキ科(Carchorus calacularis)の植物の水面栽培によって金属ほどの効果ではないが水中濃度が低下し、植物活用による環境インパクトの軽減および未然防止の水際作戦の可能性が見い出された。また水中への陰イオン界面活性剤(農薬、洗剤にも含まれる)共存時の複合影響も検討した。 3)また汚濁水域における生態系への影響を把握するために、アルミニウムと界面活性剤の共存による水生生物への影響も検討した結果、鰓のみならず脳組織への移行も促進される傾向を見出した。 これらの結果から、環境ホルモン様物質は水域内で様々な作用に関与し影響を及ぼすことが示唆されるが、今後、多くの植物の有効性を検討し水域における混合植栽のシステムを構築し、植物活用による環境水の保全の方策を確立したい。なお、植物に吸収された環境ホルモン様物質の植物代謝産物としての化学成分に関する研究も今後の課題である。
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(C), 基盤研究(C), 岡山大学, 2000年 - 2000年内分泌撹乱物質の生態毒性評価に関する調査研究
有害化学物質による環境汚染は、内分泌攪乱化学物質の存在の発見によって、一層緊急な課題となってきた。このような状況の下で、本研究は世界のエコトキシコロジー研究の動向を把握しつつ、一方では我が国における現状を分析し、内分泌攪乱化学物質による環境汚染及び生態系への影響評価についての研究を行うことを目的とする。また本企画調査研究は、特に内分泌攪乱化学物質を対象として、研究のプライオリティーを明確にしつつ、どのように研究を進めていくべきかを明らかにすることである。このために3つの研究グループを構成した。 第1グループ:バイオアッセイの手法に関する研究 本研究グループは、内分泌攪乱化学物質の生態影響を評価するための個別の手法の問題点課題について検討した。高等動物に対しては様々な方法が提案されているが、生態系に及ぼす毒性評価法はまだきわめて不十分である。まずは内分泌攪乱化学物質が生態系に及ぼす毒性作用の現象そのものにつての知見が必要な段階である。 第2グループ:内分泌攪乱化学物質の環境における運命に関する研究 本研究グループでは、外洋における内分泌攪乱化学物質による影響の実態について、海洋哺乳動物に関するデータの整理を行った。また河川における内分泌攪乱化学物質の動態について、分析化学的な研究を行い、環境資料を濃縮することにより、検出されることが明らかになった。 第3グループ:内分泌攪乱化学物質の生態系に及ぼす総合的な影響評価に関する研究 上述のように、内分泌攪乱化学物質の環境中における存在が、世界の高等動物に現れた異変から認識されるようになったが、内分泌攪乱化学物質の生態系に及ぼす影響そのものをどのように評価するかについての考え方の確立がまず望まれるところである。
競争的資金
- ソルト・サイエンス研究財団, 研究助成, 2000年 - 2000年, 研究代表者水圏生態系における新規防汚剤の究極的運命
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 岡山大学, 1998年 - 2000年生態系における難分解性・保存性有害物質の運命と生態毒性に関する研究
本研究は人間活動を起因として、環境に放出または流出した有害化学物質の生態系における運命と生態毒性評価を行うことを目的とした。 本研究では、化学物質の発生源、生態系における運命、生態毒性評価、有害化学物質の相互作用等を明らかにした。 まず発生源としては、産業廃棄物埋め立て浸出水の細胞毒性、遺伝毒性、内分泌撹乱作用の点から毒性評価を行った。ミジンコの遊泳阻害による細胞毒性は調査地点全てから検出されたが、遺伝毒性が検出されたのは数地点にすぎなかった。しかし内分泌撹乱作用は、源水を40倍濃縮すると、ほとんどの地点から検出された。河川の流下過程における有機有害化学物質の運命を現地調査によって調べた。水に難溶性の有機物質は、水相よりも底質への吸着量が多くなり、そのため毒性も強く現れた。また底質には、比較的極性の高い有機物質が支配的に毒性に寄与していることが分かった。河川の流下過程における有害化学物質の時空間的分布の特性を解析した。特に毒性が強く現れた時期の河川水について、農薬、重金属のミジンコの運動量を指標として相互作用を解析した。ミジンコを用いた毒性試験に運動量阻害の指標で評価することを試みた。従来法では24ないし48時間の死亡率もしくは遊泳阻害率が、運動量の変化を図ることによって、3時間に短縮することができ、また、低濃度でも毒性を検出することができる方法を開発した。 船底防汚剤として使用されてきたTBTに変わりIrgaro1051が新たに使用されるようになった。瀬戸内海域における海水の化学分析を行ったところ、既に全域に汚染が進んでいることが明らかになった。また、その分解産物のM1物質も全域に分布している事が分かった。その毒性については親物質よりも娘物質の方が毒性は弱いが、通常の環境で分解しにくく、長期的には、海洋環境の汚染が問題になる可能性が示唆された。
競争的資金
- ソルト・サイエンス研究財団, 研究助成, 1999年 - 1999年, 研究代表者海洋生態系における新規防汚剤の運命と生態影響
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(A), 基盤研究(A), 岡山大学, 1997年 - 1999年有害化学物質の毒性評価に関する国際比較学的研究
有害化学物質による環境汚染は生態系と人類の存亡に関わる問題として、国際的に共通な問題として認識されるに至っている。有害化学物質による環境汚染の管理,制御方法はそれぞれの国の考え方や事情によって異なる。わが国における管理法は、化学分析を行い、あらかじめ定められた環境基準地との比較によって管理しようとしている。一方、欧米、カナダではバイオアッセイの手法を用いて環境中における有害化学物質意の存在を先ず確認ずることからはじめており,様々なバイオアッセイ法が開発され,また簡便なキットが用いられている。本研究は各国の動向を調査研究し、今後の我が国における化学物質の管理・制御手法に資することを目的としている。 初年度は、オーストラリア、中国を訪問し、我が国の動向を報告するとともに、二国の状況についての情報を収集した。両国においては特別な管理システムはなかった。カナダから共同研究者を招聘し、また日本側の共同研究者をカナダに派遣し、化学物質の微生物分解とヒドラを用いたバイオアッセイについての共同研究を行った。 2年度は、日本からカナダ、チェコ、ベルギー、スイス、オーストリア、中国、台湾を訪問し、またカナダ、スイス、南アフリカから共同研究者を招聘し、意見交換を行った。バイオアッセイの開発についてはミジンコの運動量解析による感受性の高い毒性検出法ついて研究を行った。 最終年度は南アフリカ、プレトリア市で開催された国際シンポジウムに共同研究者が集まり、研究発表を行うとともに、グループの研究集会を開催し、意見交換と報告書のまとめ方についての議論した。3月には研究報告書の印刷を行った。
競争的資金
- ソルト・サイエンス研究財団, 研究助成, 1998年 - 1998年, 研究代表者新規防汚剤とその分解産物が海洋生態系に及ぼす影響評価に関する研究
競争的資金
- 日本学術振興会, 科学研究費助成事業 奨励研究(A), 奨励研究(A), 岡山大学, 1997年 - 1998年新規防汚剤による瀬戸内海の汚染評価および生態毒性評価
1、 瀬戸内海港湾部における海水中のIrgarol 1051 1996年から.1997年にわたり、瀬戸内海沿岸の1府9県におけるマリーナ、漁港、貿易港において採取した海水93試料の内、24試料からIrgarol 1051を検出した。溶存態Irgarol 1051濃度は0〜264ng/Lであり、ヨーロッパで報告されている濃度範囲内にあった。1998年には岡山県南部の2定点で経時的測定を行い、すべての海水試料から本物質を検出した。以上のことから、本物質は主として小型のプレジャーボートおよび漁船用の船底塗料として使用されていると考えられた。ヨーロッパ以外での残留分析はこれが初報である。2、 Irarol 1051の光分解性評 野外実験により、1)水中の本物質は太陽光によって分解し、難分解性の分解産物M1を生成すること、2) 光分解速度は純水中よりも天然水中においてより早く、しかもM1の生成量は天然水中の方がより多いことを明らかにした。紫外線ランプを用いた室内実験によっても、野外実験での観察結果を再現することができた。 3、 Irarol 1051および分解産物の生態毒性評価 1) 分解産物の分離精製:分解産物Mlは異なる3種の分解経路(太陽光分解、木材腐朽菌による生分解、水銀を触媒とした加水分解)によって生成することを明らかにした。そこで、水銀化合物を触媒とした親物質の加水分解反応を利用してMlを大量に生成させ、HPLCを用いて分離精製した。 2) 急性・慢性毒性評価:マイクロバイオテストを活用した生態毒性試験により、分解産物M1の毒性を定量的に評価した。藻類および甲殻類に対するM1の毒性は親物質よりもやや弱かったが、藻類に対する阻害は市販の除草剤の活性に匹敵していた。また、親化合物は高等植物の幼根伸長に対して阻害を示さなかったが、分解産物は強い阻害を示した。
- 科学研究費補助金／奨励研究(A), 1997年 - 1998年, 研究代表者新規防汚剤による瀬戸内海の汚染評価および生態毒性評
競争的資金
- 住友財団, 環境研究助成, 1997年 - 1997年, 研究代表者農業活動が水圏生態系に及ぼす影響評価に関する研究
競争的資金
- 日本学術振興会, 科学研究費助成事業 基盤研究(A), 基盤研究(A), 岡山大学, 1995年 - 1997年バイオアッセイによる有害化学物質のモニタリングシステムの開発研究
有害化学物質による環境汚染は生態系と人類の生存に関わる問題として懸念されている。このような化学物質の環境の中での存在を迅速、安易、且つ低コストで検出するシステムが要請されている。本研究は種々の微生物を用いて水中及び、底質中の有害化学物質を検知し、その毒性強度を知ることを目的とする。本研究においてはミジンコ、植物プランクトン、酵母等の微生物とレタス種子を供試生物として用いた場合の毒性エンドポイントとして、増殖速度係数、一定時間後のバイオマスあるいは増殖過程におけるLag Timeの長さを評価した。またミジンコについては通常の24時間死亡率とともに、初期の運動量変化を新しい指標とする毒性評価手法を開発し、その確立を図ることを試みた。このようなバイオアッセイ手法を適用することにより、実環境における有害化学物質のモニタリングシステムの可能性を検討した。研究対象環境は河川、湖沼それらの水と底質、及び産業廃棄物処分場からの浸出水である。新しいバイオアッセイとして開発したミジンコの初期運動量の解析手法は、従来法が24ないし48時間要するに対し、これを3時間にまで大幅に短縮することができた。また化学物質の低濃度域でミジンコを暴露すると、刺激により運動量は増加し、これをTOXI(毒性指標)という概念で評価することにより、高感度で化学物質の存在を検出できることがわかった。流域に農地を有する河川の流下過程や湖沼において採水、採泥し、それらの毒性試験を行ったところ、季節的な毒性強度の変化が見られ、農業活動との関連性が示唆された。また自動車解体産業廃棄物を主とする埋立地の浸出水を用いて毒性試験を行ったところ、原液の3%濃度でミジンコの有害阻害が検出された。微生物より、ミジンコやレタスの高等動植物の方が高い感受性を示した。本研究結果は、環境における有害化学物質をバイオアッセイによってモニタリングする際、感受性の高い生物種を用い、バッテリ-テストを行うことの重要性を示唆している。 本研究の上述の種々のバイオアッセイを利用して、河川水、湖沼水、廃棄物埋立地浸出水を採取し、実環境の試料水についての生態毒性評価を行った。
競争的資金
- 日本学術振興会, 科学研究費助成事業 奨励研究(A), 奨励研究(A), 岡山大学, 1995年 - 1995年, 研究代表者太陽光近紫外線による水田除草剤の光分解
水圏環境における農薬の間接光分解に関わる光増感物質の役割を明らかにすることを目的とし、太陽光近紫外線による除草剤の光分解に関する実験を行なった。供試農薬として我が国において使用量の多い代表的な水田除草剤3種類を用いた。各農薬および光増感物質を試験管中の純水に添加し、蛍光ブラックライトからの近紫外線を5日間照射した。esprocarbは直接光分解によってほぼ完全分解したが、dymron,mefenacetの光分解は認められなかった。一方、2%アセトンを加えた場合にはdymronは光分解し、mefenacetの光分解は認められなかった。このようにdymronが間接光分解を生じることが明らかとなったので、以後の実験では供試農薬としてdymronを供試した。 1995年3月から12月まで1ヵ月毎に採水した河川水をそれぞれ凍結乾燥により濃縮し、これにdymronを添加して近紫外線を15日間照射した。光分解は採水時期に関わらず認められ、多くの場合に濃縮河川水で顕著であった。特に4月および5月に採水した河川水における光分解が顕著であった。4月に採取した河川水のpHを4、6、8(pH無調節)、10に調節したところ、dymronの光分解はアルカリ側で顕著に認められた。同じ河川水を加熱処理しても光分解が生じたことから、光増感物質は熱に安定であると考えた。2種類の樹脂(活性炭,イオン交換)をそれぞれ通過させた河川水中では光分解が著しく抑制されたことから、光増感物質はこれらの樹脂に補足されたと考えられた。ゲル瀘渦によって河川水中の光増感物質を分取し、比較的低分子量のピークを有する画分に強い光増感作用を認めた。 このような間接光分解は水圏環境において普遍的に生じていると考えられ、今後はその反応機構を明らかにするために天然光増感物質の同定、さらに農薬の光分解産物に関する情報を得ることが急務である。
競争的資金
- 日本学術振興会, 科学研究費助成事業 一般研究(C), 一般研究(C), 岡山大学, 1993年 - 1995年コンプレキサン汚濁水の動態と修復に関する研究
1 環境水(都市河川、湖沼)中のコンプレキサンによる汚濁は、EDTA,NTA等は濃度的には低濃度である。しかし、界面活性剤による汚濁は人間活動の周期に呼応して濃度変動を示し、朝、昼、夕の食事時間あるいは洗濯時間に顕著な濃度上昇が見られた。また、市街地河川ことに流速が小さく淀む地点では微生物分解、土壌や植物への吸着および清水による希釈等による濃度低下が認められた。平均濃度から季節的には冬>秋、春>夏の傾向がみられ水温に依存した結果となった。 2 植物体に及ぼすコンプレキサンの影響は、EDTA,NTAの場合、植物の発芽から3週間程度までの添加栽培実験では河川水中濃度の100倍程度では顕著な影響は出現しないが、陰イオン界面活性剤はやや生育に影響が発生し、特に根部の伸長に影響が発生した。また、陰イオン界面活性剤の植物体中への移行集積は暴露濃度および暴露時間に比例して増大する傾向が確認された。 3 かび臭気物質を産生する藻類の増殖にはコンプレキサンが必要であるが、藻類の種類およびコンプレキサンの種類に依存し、鉄濃度の4モル倍量の添加で増殖阻害が発生するもの、あるいは15モル倍以上の過剰添加でも良好な増殖を示すものもあることが判明した。 4 磁気および波動等を利用した水活性化機器を用いて、コンプレキサ汚濁水中での藻類の表面細胞の破裂による増殖抑制効果を一部に認めた。すなわち、富栄養化に伴う藻類やプランクトンの繁殖を助長に働くコンプレキサンによる汚濁を微弱エネルギーを用いて制御および修復できる可能性が認められた。
競争的資金
- バイオサイドが海洋環境に及ぼす影響評価
競争的資金
- バイオアッセイを活用した廃棄物の管理
競争的資金
- Waste management using bioassay
競争的資金
- Environmental assessment of biocide on marine environments.
競争的資金