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Effect of live acremonium strictum KR21-2 fungus on the mobility of REEs during the bio-oxidation of Mn(II)

生物起源Mn酸化物へのREEの吸着

Yu, Q.; 大貫 敏彦; 田中 万也*  ; 香西 直文   ; 坂本 文徳  ; 谷 幸則*

Yu, Q.; Onuki, Toshihiko; Tanaka, Kazuya*; Kozai, Naofumi; Sakamoto, Fuminori; Tani, Yukinori*

It is well known that microorganisms possess high sorption capability for REEs. However, their biological effect on the migration of REEs in aquatic environment is unclear. To test the biological response of the fungus to REEs, fungus spores were incubated in a medium contained Mn(II) and REE(III)s. In a comparison test, trisodium citrate, a strong chelating agent for REEs, was added to the same medium to compare the cell response to REEs under reduced REEs sorption conditions. In the absence of citrate, One of the biomolecules released from the fungus associated only with Ce and not with the other REEs or Fe, suggesting that this biomolecule specifically associates with Ce(IV) and is different from siderophore like substances. In contrast, in the presence of trisodium citrate, neither desorption of Ce nor release of the specific Ce(IV)-binding biomolecule was observed. The present findings highlight the impact of microbe adaptation and defense mechanisms on REEs migration.

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