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Reduction of vanadium(V) by Enterobacter cloacae EV-SA01 isolated from a South African deep gold mine
Jacqueline van Marwijk1, Diederik J Opperman, Lizelle A Piater
1Department of Microbial, Biochemical and Food Biotechnology, University of Free State, PO Box 339, Bloemfontein 9300, South Africa.
Abstract:
Dissimilatory reduction of vanadium(V) by Enterobacter cloacae EV-SA01, isolated from a gold mine at 1.6 km below surface, is shown to occur anaerobically as well as aerobically. Growth rates were unaffected by up to 2 mM V(2)O(5). Reduction of vanadium(V) was growth phase-dependent and resulted in cell deformities and precipitation of the vanadium in its lower oxidation states. The vanadate reductase activity was membrane-associated and coupled the oxidation of NADH to the reduction of vanadate.
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