Investigation of adsorption mechanism of Mo(VI) by baker's yeast and applicability to the uranium liquid waste treatment process

Arai, Yoichi; Hasegawa, Kenta; Watanabe, So; Watanabe, Masayuki; Minowa, Kazuki*; Matsuura, Haruaki*; Hagura, Naoto*; Katsuki, Kenta*; Arai, Tsuyoshi*; Konishi, Yasuhiro*

Journal of Radioanalytical and Nuclear Chemistry, 333(7), p.3585 - 3593, 2024/07

https://doi.org/10.1007/s10967-023-09278-5

Reparability of lethal lesions produced by phosphorus photoabsorption in yeast cells

Usami, Noriko*; Yokoya, Akinari; Ishizaka, Shozo*; Kobayashi, Katsumi*

Journal of Radiation Research, 42(3), p.317 - 331, 2001/09

https://doi.org/10.1269/jrr.42.317

The characteristics of DNA lesions produced by the phosphorus K-shell absorption in yeast cells were studied using monochromatized soft X-rays tuned to the phosphorus K-edge peak (2153 eV) and below the peak energy (2147 eV). The repaired fractions of DNA double-strand breaks (dsb) were measured relatively by using both a mutant, (), which shows the temperature-sensitive dsb repair-deficient, and a wild-type strain. The repaired fraction of lesion in , which corresponds to the relative yield of dsb reparable by the pathway, was not affected by the phosphorus photoabsorption. Repair of the produced lesions in the wild-type cells was also measured by comparing the surviving fraction of the immediately plated cells to that of those cells plated after holding in a non-nutrient medium for 80 hrs. The recovery of the surviving fraction after the holding treatment was dependent upon the soft X-ray energy. These results suggest that irrepairable lesions are produced by the inner-shell photoabsorption of phosphorus in DNA, although its yield is small.

Immobilization of yeast cells on hydrogel carriers obtained by radiation-induced polymerization

L.Z.Xin*; M.Carenza*; Kaetsu, Isao*; Kumakura, Minoru*; Yoshida, Masaru; Fujimura, Takashi

Radiation Physics and Chemistry, 40(6), p.579 - 584, 1992/00

https://doi.org/10.1016/1359-0197(92)90227-7

no abstracts in English

Nature of yeast cells immobilized by radiation polymerization activity dependence on the molecular motion of polymer carriers

Fujimura, Takashi; Kaetsu, Isao

Zeitschrift fr Naturforschung, C, 40, p.576 - 579, 1985/00

no abstracts in English

Ethanol production and the effect of porous polymer carriers on immobilized growing yeast cells by radiation-induced polymerization

Fujimura, Takashi; Kaetsu, Isao

Int.J.Appl.Radiat.Isot., 34(6), p.929 - 931, 1983/00

https://doi.org/10.1016/0020-708X(83)90157-6

no abstracts in English

Immobilization of yeast cells by radiation-induced polymerization

Fujimura, Takashi; Kaetsu, Isao

Zeitschrift fr Naturforschung, C, 37C, p.102 - 106, 1982/00

no abstracts in English

Behavior of U(VI) in a simple prey (Yeast) - predator (Paramecium) food chain

Kozai, Naofumi; Onuki, Toshihiko; Koka, Masashi; Sato, Takahiro; Kamiya, Tomihiro; Esaka, Fumitaka

no journal, , 

To reveal the role of protozoa in migration of radionuclides in the environment, this study investigated behavior of U(VI) during culture of Paramecium sp. (P. bursaria) in media containing yeast on which U was sorbed. Paramecium was chosen as model protozoa because it is the most well known unicellular protozoa. After the contact of yeast cells with a U (VI) solution, U phosphates formed on yeast cells. P. bursaria cells were cultured with those yeast cells in an inorganic salt solution containing no phosphate. Only 3% of the presorbed U was dissolved from yeast cells into the liquid phases during the culture of Paramecium. As culture time advances, membranous precipitates formed. These membranous precipitates contained undigested and digested yeast cells and dense membranous organic substance filling gaps between those cells. In the membranous precipitates many particles of U phosphates which size and morphology are similar to those observed in the yeast cells were observed. These results suggest that the U immobilization effect of yeast cells was preserved in the prey-predator system