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Tc(VII) reduction and removal from solution as an insoluble precipitate by washed cell suspensions of G. sulfurreducens. Acetate (20 mM), formate (20 mM), or hydrogen (80:20 H2-CO2 in the headspace) was supplied as an electron donor. Controls contained no added electron donor. Reduced insoluble Tc was removed from solution by centrifugation prior to analysis using a phosphorimager (19).
