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多様なセシウム汚染廃棄物の中間・最終処分安全評価のための機関連携による多角的研究,10; Cs移行への微生物活性の影響

Multidisciplinary investigation on radiocesium fate and transport for safety assessment for interim storage and disposal of heterogeneous waste, 10; Effects of microbial activity on migration of Cs

大貫 敏彦; 坂本 文徳 ; 香西 直文  ; 山崎 信哉*; 塩津 弘之 ; 宇都宮 聡*

Onuki, Toshihiko; Sakamoto, Fuminori; Kozai, Naofumi; Yamasaki, Shinya*; Shiotsu, Hiroyuki; Utsunomiya, Satoshi*

放射性Csの移行への微生物の活性の影響を酵母を用いて調べた。その結果、微生物の活性がある状態でのCs取り込み量は休眠状態よりも大きかった。さらに、培地中に鉱物を添加することにより取り込み量の減少が見られた。したがって、酵母は活性条件では鉱物などと競合しながら細胞内にCsを取り込む。

Accumulation of Cs by unicellular fungus of Saccharomyces cerevisiae in the presence of minerals have been studied to elucidate the role of microorganisms in the migration of radioactive Cs in the environment. With carbon source, higher amounts of Cs was accumulated in the cells than in the resting condition without carbon source. In the presence of mineral in the agar medium, the radioactivity in the yeast cells with different minerals were in the order of the inverse of Kd of minerals. These results strongly suggest that the yeast accumulates radioactive Cs competitively with minerals.

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