@article{oai:miyazaki-u.repo.nii.ac.jp:00001378,
 author = {中島, 暉 and Nakajima, Akira and 植田, 勇人 and Ueda, Yuto and 横山, 秀克 and Yokoyama, Hidekatsu and Ohya, Hiroaki and Ohya-Nishiguchi, Hiroaki and 大矢, 博明 and 鎌田, 仁 and Kamada, Hitoshi},
 journal = {磁気共鳴と医学},
 month = {},
 note = {The effect of uranium biosorption on the hydroxy radical generation in UO2
2+-H2O2 system were investigated. The amounts of uranium adsorbed by bacterial cells are differed with different species of bacteria, and Arthrobacter nicotianae has the highest ability to adsorb uranium among bacteria tested. ESR signal having four lines （intensity ratio, 1:2:2:1 ） is observed in UO2 2+-H2O2 system. Its g-value and hyperfine constants were estimated to be g = 2.0066, aN = 1.49 mT and aH = 1.49 mT by the computer simulation, and the signal was identified to DMPO-OH. The ESR signal intensity of DMPO-OH in UO2
2+-H2O2 system increases as the time passing, which is quite different from Fe2+-H2O2, VO2+-H2O2, and Cu2+-H2O2 systems. Three steps of reactions were assumed for the hydroxy radical generation; （1） reduction of UO2 2+ to UO2 + by H2O2, （2） disproportionation of resulting UO2 + to UO2+ and UO2 2+, （3） oxidation of resulting UO2+ to UO2 2+ by H2O2 and generation of hydroxy radical. When bacterial cells are added to the reaction mixture, ESR signal intensity of DMPO-OH decreases. Egg albumin also indicates similar suppression effect. Two possibile mechanisms were proposed to these results; （1） hydroxy radical was eliminate by the antioxidant action of microbial cells, and then DMPO-OH decreases. （2） microbial cells strongly couples with uranyl ion, which suppresses the uranyl ion reduction by H2O2, and then DMPO-OH decreases.},
 pages = {25--28},
 title = {微生物によるウランなどの重金属元素の生物吸着とそのヒドロキシラジカル発生に及ぼす影響},
 volume = {11},
 year = {2000},
 yomi = {ナカジマ, アキラ and ウエダ, ユウト and ヨコヤマ, ヒデカツ and オオヤ, ヒロアキ and カマダ, ヒトシ}
}