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Journal Articles

Radioactive Cs in the severely contaminated soils near the Fukushima Daiichi Nuclear Power Plant

Kaneko, Makoto*; Iwata, Hajime; Shiotsu, Hiroyuki; Masaki, Shota*; Kawamoto, Yuji*; Yamasaki, Shinya*; Nakamatsu, Yuki*; Imoto, Jumpei*; Furuki, Genki*; Ochiai, Asumi*; et al.

Frontiers in Energy Research (Internet), 3, p.37_1 - 37_10, 2015/09

The mobility of the aggregates of submicron-sized sheet aluminosilicate in the surface environment is a key factor controlling the current Cs migration in Fukushima.

Journal Articles

Effects of CeO$$_{2}$$ nanoparticles on microbial metabolism

Masaki, Shota*; Shiotsu, Hiroyuki; Onuki, Toshihiko; Sakamoto, Fuminori; Utsunomiya, Satoshi*

Chemical Geology, 391, p.33 - 41, 2015/01

 Times Cited Count:9 Percentile:31.77(Geochemistry & Geophysics)

Distinct organic species and intracellular proteins were expressed after exposure of yeast cells to CeNPs. Although cytotoxicity was not caused by CeNPs, the results of the peptide mass fingerprint analysis of the intracellular protein revealed that Eno2p, a glycolysis enzyme, was expressed after the exposure to CeNPs. These results suggest that nanoparticles have the potential to alter microbial metabolism, leading to changes in the compositions of the released substances in the surrounding environment.

Oral presentation

Effect of REE nano-particles on microbial metabolism and oxidation of Ce(III) by MnO$$_{2}$$

Onuki, Toshihiko; Masaki, Shota*; Utsunomiya, Satoshi*; Tanaka, Kazuya*; Yu, Q.; Kozai, Naofumi; Sakamoto, Fuminori; Saito, Takumi

no journal, , 

Some low-molecular-mass organic species released from the yeast after exposure to CeNPs. Although the CeNPs did not cause cytotoxicity, the organic species enhaced solubility of Ce nano particles. Formation of Ce nano-particles on the cell surface suppressed the oxidation of trivalent Ce to tetravalent Ce by Mn oxides.

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