Different electron acceptors usage by bacteria of Desulfuromonas sp. isolated from Yavoriv lake
O. Moroz, N. Gulí, A. Galushka, G. Zvir, B. Borsukevych
Ivan Franko National University of Lviv
4, Hrushevskyi St., Lviv 79005, Ukraine
Sulfur-reducing bacteria of Desulfuromonas genus, isolated from Yavoriv Lake, use L-cysteine sulfur and polysulfide sulfur as electron acceptors of anaerobic energy metabolism with its reducing to sulfide. Bacteria didnít reduce thiosulfate, sulfite and sulfate sulfur. Bacteria didnít use nitrogen of nitrate and nitrite as electron acceptor. Desulfuromonas sp. bacteria use fumarate and malate simultaneously as electron acceptors, donors and carbone sources for growth. It was established that Fe (III), Cr (VI) and Mn (IV) at concentration of 3.5 mM more than twice inhibit growth and level of hydrogen sulfide formation by bacteria cells, incubated with this metals compounds. In spite of this sulfur reducing bacteria used Fe (III), Cr (VI) and Mn (IV) at that concentration as terminal electron acceptors with reducing them to less toxic to environment forms.
Keywords: sulfur-reducing bacteria, electron acceptors, transition heavy metals