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タイトル: Isolation of monomethylarsonic acid-mineralizing bacteria from arsenic contaminated soils of Ohkunoshima Island
著者: Maki, Teruya link image link image
Takeda, Noriko
Hasegawa, Hiroshi link image link image
Ueda, Kazumasa link image
牧, 輝弥
長谷川, 浩
上田, 一正
発行日: 2006年 9月
出版社(者): John Wiley & Sons Ltd.
引用: Applied Organometallic Chemistry,20(9),pp.538-544
雑誌名: Applied Organometallic Chemistry
ISSN: 0268-2605
巻: 20
号: 9
開始ページ: 538
終了ページ: 544
キーワード: Arsenic contaminated soil
Bacteria
MMAA mineralization
Monomethylarsonic acid
Organoarsenic
抄録: Chemical warfare agents, composed of harmful organoarsenic compounds have contaminated the soils of Ohkunoshima Island with high levels of arsenic. As a basic research establishing useful bioremediation techniques, environmental factors such as arsenic concentrations and bacterial biomass in the soils were investigated. Among the five stations of Ohkunoshima Island, the soils of four stations were contaminated by high levels of arsenic compounds at concentrations of 125,12.7, 3.29 and 0.504 g/kg soil, while the other station with low arsenic concentrations of 0.007 g/kg soil was considered an uncontaminated area. The distribution of arsenic compounds originating from the chemical weapon agent differs among the various areas of Ohkunoshima Island. The cell densities of arsenate-resistant bacteria also varied among the five stations, ranging from 106 to 108 cells/g soil. In an attempt to isolate bacteria that strongly mineralize the organoarsenic compounds, the mineralization activities for monomethylarsonic acid [MMAA(V)] of 48 isolates of arsenate-resistant bacteria were determined. Only nine isolates reduced 140 μg/1 of MMAA(V), giving decreasing percentages ranging from 5 to 100% within 14 days. Among the nine isolates, two remarkably converted 140 μg/1 of MMAA to more than 71 μg/1 of inorganic arsenic. Presumably only specific members of the environmental bacterial population have strong mineralization activities for MMAA. Phylogenetic analysis using 16S rDNA sequences showed that the two isolates belonged to the Pseudomonas putida strains, which are known to have strong mineralization activity for various organic compounds. In the soil contaminated by arsenic at a high level, few bacteria in the arsenate-resistant bacterial group would significantly mineralize organoarsenic compounds. Copyright © 2006 John Wiley & Sons, Ltd.
URI: http://hdl.handle.net/2297/2800
関連URI: http://dx.doi.org/10.1002/aoc.1075
http://www.interscience.wiley.com/
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(工)

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