Reduction of uranium(VI) phosphate during growth of the thermophilic bacterium thermoterrabacterium ferrireducens

Khijniak, T. V. and Slobodkin, A. I. and Coker, V. and Renshaw, J. C. and Livens, F. R. and Bonch-Osmolovskaya, E. A. and Birkeland, N. K. and Medvedeva-Lyalikova, N. N. and Lloyd, J. R. (2005) Reduction of uranium(VI) phosphate during growth of the thermophilic bacterium thermoterrabacterium ferrireducens. Applied and Environmental Microbiology, 71 (10). pp. 6423-6426. ISSN 0099-2240

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    Abstract

    The thermophilic, gram-positive bacterium Thermoterrabacterium ferrireducens coupled organotrophic growth to the reduction of sparingly soluble U(VI) phosphate. X-ray powder diffraction and X-ray absorption spectroscopy analysis identified the electron acceptor in a defined medium as U(VI) phosphate [uramphite; (NH4)(UO2)(PO4) · 3H 2O], while the U(IV)-containing precipitate formed during bacterial growth was identified as ningyoite [CaU(PO4)2 · H2O]. This is the first report of microbial reduction of a largely insoluble U(VI) compound.