Enzymatic U(VI) reduction by Desulfosporosinus species
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Yohey Suzuki
Summary
Here we tested U(VI) reduction by a Desulfosporosinus species (sp.) isolate and type strain (DSM 765) in cell suspensions (pH 7) containing 1mM U(VI) and lactate, under an atmosphere containing N2-CO2-H2 (90:5:5). Although neither Desulfosporosinus species (spp.) reduced U(VI) in cell suspensions with 0.25 Na-bicarbonate or 0.85 NaCl, U(VI) was reduced in these solutions by a control strain, Desulfovibrio desulfuricans (ATCC 642). However, both Desulfosporosinus strains reduced U(VI) in cell suspensions depleted in bicarbonate and NaCl. No U(VI) reduction was observed without lactate and H2 electron donors or with heat-killed cells, indicating enzymatic U(VI) reduction. Uranium(VI) reduction by both strains was inhibited when 1mM CuCl2 was added to the cell suspensions. Because the Desulfosporosinus DSM 765 does not contain cytochrome c3 used by Desulfovibrio spp. to reduce U(VI), Desulfosporosinus species reduce uranium via a different enzymatic pathway.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Artikel in diesem Heft
- Fission fragment angular momentum in the spontaneous fission of 244Cm
- Limiting transport properties and hydration numbers of actinyl ions in pure water
- Enzymatic U(VI) reduction by Desulfosporosinus species
- Enhanced extraction of thorium(IV) and uranium(VI) with 1-phenyl-3-methyl-4-pivaloyl-5-pyrazolone in the presence of various neutral organophosphorus extractants
- Studies on the equilibrium and mechanism of Th(IV) extraction by CYANEX 272 in kerosene from nitrate medium
- Crown ethers as synergists in the extraction of trivalent lanthanoids with 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone
- 99Tc detection in water samples by ICP-MS
- Adsorption and thermodynamic studies of Co(II) and Hg(II) on 2-nitroso-1-naphthol immobilized polyurethane foam using radiotracer technique
- Strontium and cesium sorption to Snake River Plain, Idaho soil
