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Suzuki, Yoshinori*; Saiki, Hiroshi*; Kitamura, Akira; Yoshikawa, Hideki
no journal, ,
Biofilms of 
, which is an iron-reducing bacteria, were formed and their structure was investigated by a conforcal laser scaning microscopy (CLMS). Then reduction of selenite by the biofilms was examined.
Nagaoka, Toru*; Nakamura, Takamichi*; Sasaki, Yoshito; Asano, Takahiro*; Ito, Tsuyoshi*; Amano, Yuki; Iwatsuki, Teruki; Yoshikawa, Hideki
no journal, ,
Laboratory jar experiment was conducted with deep subsurface sedimentary rock and groundwater, in order to assess the response of the geochemical and microbial communities toward redox processes. The redox process was induced by exposure to air and discontinuation to sediment suspension, which simulated the process occurring during operation of nuclear waste repositories. As a results, after discontinuation of air exposure with lactate amendment, redox potentials decreased from ca. +100 mV to -600 m V (vs. Ag/AgCl), and some sequential terminal electron-accepting process (TEAPs) was observed with the reactions of aerobic respiration, iron reduction and hygrogen fermentation. The related species of the microbes along with TEAPs, e.g., Pseudomonas sp. for aerobic respiration and Shewanella sp. for iron reduction, was also detected. These results indicated that the microbial activities would affect the geochemical changes in nuclear repositories.
Onuki, Toshihiko; Sakamoto, Fuminori; Kozai, Naofumi; Yamasaki, Shinya; Yoshida, Zenko*; Namba, Kenji*
no journal, ,
Local area distribution and relocation of radiocesium in trees has been studied by measuring its spatial distribution on/in trees using autoradiography analysis. Our results indicate that distribution of radiocesium deposited on/in the trees has been gradually changed with time in the scale of the year.
Shiotsu, Hiroyuki; Giang, M.*; Nakamatsu, Yuki*; Onuki, Toshihiko; Utsunomiya, Satoshi*
no journal, ,
Yaita, Tsuyoshi
no journal, ,
no abstracts in English
Nagaoka, Mika; Kinoshita, Norikazu*; Sumi, Takahiro*; Takimoto, Kiyotaka*; Yokoyama, Akihiko*; Nakanishi, Takashi*
no journal, ,
no abstracts in English