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Journal Articles

Complexation of Eu(III), Pb(II), and U(VI) with a ${{it Paramecium}}$ glycoprotein; Microbial transformation of heavy elements in the aquatic environment

Kozai, Naofumi; Sakamoto, Fuminori; Tanaka, Kazuya; Onuki, Toshihiko; Sato, Takahiro*; Kamiya, Tomihiro*; Grambow, B.

Chemosphere, 196, p.135 - 144, 2018/04

https://doi.org/10.1016/j.chemosphere.2017.12.154
 Times Cited Count：5 Percentile：17.39(Environmental Sciences)

Transformation of heavy elements by microbes such as bacteria and fungi has been an intense research subject; however, little is known about that of protozoa. This study investigated interaction of a representative protozoa, ${{it Paramecium}}$, with heavy elements (Eu(III), Pb(II), U(VI)). Non-destructive elemental analysis by micro-PIXE hardly detected those elements on living cells after sorption experiments but clearly detected on the cells that were killed with a fixative beforehand. Chromatographic analysis of aquatic species of those heavy elements after the sorption experiments revealed a fraction of those elements bound to a glycoprotein dissolved from the cell surface of living ${{it Paramecium}}$ cells to form soluble pseudocolloid. These findings suggest that complexation of heavy elements with the dissolved surface glycoprotein reduced the sorption of those heavy elements on living cells.

Journal Articles

Durability of an La$$_{2}$$Zr$$_{2}$$O$$_{7}$$ waste form in water

*;

J. Mater. Sci., 28, p.513 - 517, 1993/00

https://doi.org/10.1007/BF00357832
 Times Cited Count：20 Percentile：68.57(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Anion-exchange behavior of Db in HF/HNO$$_{3}$$ solution

Kato, Mizuho*; Adachi, Sadia*; Toyoshima, Atsushi*; Tsukada, Kazuaki; Asai, Masato; Haba, Hiromitsu*; Yokokita, Takuya*; Komori, Yukiko*; Shigekawa, Yudai*; Sueki, Keisuke*

no journal, , 

A few studies have been so far performed on aqueous chemistry of Db, the group-5 superheavy element, by anion-exchange experiments in HF and HF/HNO$$_{3}$$ mixture solutions. Although the distribution coefficient (Kd) of Db was shown to trend to Ta $$>$$ Nb $$>$$ Db $$>$$ Pa in the group-5 homologs and pseudo-homolog elements, its chemical species has not been clarified. In this work, for identification of fluoride species of Db, we performed anion-exchange experiments of Nb, Ta, and Db in HF/1.0 M HNO$$_{3}$$ mixture solutions by using an automated rapid chemistry apparatus, ARCA.

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