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Kimura, Tatsuki*; Fukutani, Satoshi*; Ikegami, Maiko*; Sakamoto, Fuminori; Kozai, Naofumi; Grambow, B.*; Yoneda, Minoru*
Chemosphere, 276, p.130121_1 - 130121_7, 2021/08
Times Cited Count：1 Percentile：6.09(Environmental Sciences)The adsorption of cesium (Cs) on biotite and dissolution of Cs from Cs-bearing biotite using a siderophore were investigated aiming to contribute to the elucidation of radiocesium migration mechanisms in the soil environment. Cs was adsorbed on a hardly weathered biotite powder sample. A siderophore was extracted and purified from the bacterial culture medium, and the purified siderophore was used in five consecutive dissolution experiments of the biotite samples. The major components of the biotite (Al, Fe, and Mg) were dissolved almost stoichiometrically, strongly suggesting that the siderophore selectively dissolves the broken edges of the biotite. The Cs adsorbed on the broken edges was dissolved rapidly as the siderophore dissolved the broken edges, and then, the Cs adsorbed on the outer planar surface of the biotite particles was slowly dissolved.
via increasing the aluminium detoxicants, chlorogenic acid and oosporeinHaruma, Toshikatsu*; Yamaji, Keiko*; Ogawa, Kazuyoshi*; Masuya, Hayato*; Sekine, Yurina; Kozai, Naofumi
PLOS ONE (Internet), 14(2), p.e0212644_1 - e0212644_16, 2019/02
Times Cited Count：23 Percentile：78.84(Multidisciplinary Sciences)Miscanthus sinensis Andersson is a pioneer plant species that grows naturally at mining sites. can detoxify aluminium (Al) by producing phytosiderophores. Root-endophytic Chaetomium cupreum, which produces microbial siderophores, enhances Al tolerance in M. sinensis. We identified the siderophore produced by C. cupreum as oosporein. It was revealed that oosporein could detoxify Al. Inoculation test of C. cupreum onto M. sinensis in acidic mine soil showed that C. cupreum promoted seedling growth, and enhanced Al tolerance.
Ozaki, Takuo; Suzuki, Yoshinori*; Nankawa, Takuya; Yoshida, Takahiro; Onuki, Toshihiko; Kimura, Takaumi; Francis, A. J.*
Journal of Alloys and Compounds, 408-412, p.1334 - 1338, 2006/02
Times Cited Count：47 Percentile：87.21(Chemistry, Physical)We investigated the interactions of Eu(III) with the common soil bacterium Pseudomonas fluorescens and organic ligands, such as malic acid, citric acid, and a siderophore (DFO). Malic acid formed complexes with Eu(III), but degradation of malic acid was observed when the ratio of malic acid to Eu(III) was high. Citric acid formed a stoichiometric complex with Eu(III) that was not degraded by P. fluorescens. Adsorption of Eu(III) from the DFO complex occurred as a free ion dissociated from DFO and not as the Eu(III)-DFO complex. Time-resolved laser-induced fluorescence spectroscopy analysis showed that adsorption of Eu(III) on P. fluorescens was through a multidentate and predominantly inner-spherical coordination.
-Al
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cells in the presence of desferrioxamine B; Implication of siderophores for the Ce anomalyYoshida, Takahiro; Ozaki, Takuo; Onuki, Toshihiko; Francis, A. J.*
Chemical Geology, 212(3-4), p.239 - 246, 2004/12
Times Cited Count：45 Percentile：63.36(Geochemistry & Geophysics)no abstracts in English
Yoshida, Takahiro; Ozaki, Takuo; Onuki, Toshihiko; Francis, A. J.*
Radiochimica Acta, 92(9-11), p.749 - 753, 2004/12
Times Cited Count：14 Percentile：66.09(Chemistry, Inorganic & Nuclear)Accumulation of Fe(III)-, Eu(III)-, Hf(IV)-, and Pu(IV)-desferrioxamine B (DFO) complexes by aerobic bacterium, (ATCC 55241) was studied in order to elucidate stability of DFO complexes on biosorption. When Eu(III)-DFO complex was incubated with bacteria in 0.1 M Tris-HCl buffer (pH = 7.2), the metals were removed from solution, with no change in DFO concentration in solution. On the other hand, Fe(III)-, Hf(IV)-, and Pu(IV)-DFO complexes were not accumulated to bacteria. Metals with high charge to ionic radius ratio (Z/r) suppress the dissociation of complexes, leading small bacterial accumulation.
Haruma, Toshikatsu*; Yamaji, Keiko*; Masuya, Hayato*; Sekine, Yurina; Kozai, Naofumi
no journal, ,
Chaetomium cupreum was isolated from the root of Miscanthus sinensis. The siderophore was collected and purified, and the function of the siderophore was investigated. The siderophore was identified as oosporein. C. cupreum increased Al tolerance in M. sinensis via accumulating and detoxifying Al into their mycelia using oosporein, and via changing the Al localization pattern in the roots, which was more efficient to detoxify Al.
