THE ABILITY OF SULFATE-REDUCING BACTERIA DESULFOVIBRIO DESULFURICANS YA-11 I DESULFOBACTER SP. TO USE NITRATE AS ELECTRON ACCEPTOR

T. B. Peretyatko, S. P. Gudz


DOI: http://dx.doi.org/10.30970/sbi.0502.150

Abstract


The ability of Desulfovibrio desulfuricans Ya-11 bacteria to use nitrate as terminal electron acceptor was studied. The level of biomass accumulation in the medium with nitrate changed depending on the initial NO3– concentration. At nitrate concentration 5 mM the bacterial biomass was the same as in the medium with sulfate. The intermediate product of nitrates reduction in D. desulfuricans Ya-11 is nitrite, and the final one – ammonium. High nitrates concentrations in the medium inhibit the process of dissimilatory sulfate reduction. Washed cells of D. desulfuricans Ya-11 fully reduced nitrite of the medium to ammonium. The ability of psychrophyllic sulfate-reducing bacteria Desulfobacter sp. to reduce nitrates at low temperatures is demonstrated.


Keywords


sulfate-reducing bacteria, nitrate, electron acceptor

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