PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF THIOCAPSA SP. YA-2003 BACTERIA UNDER THE INFLUENCE OF HYDROGEN SULFIDE

The growth of phototrophic purple sulfur Thiocapsa sp. Ya-2003 bacteria under the influence of different concentrations of hydrogen sulfide was studied. The addition of 6, 8 and 10 mM H2 S inhibited the growth of sulfur bacteria under study, as well as utilization of hydrogen sulfide by them was shown. Superoxide dismutase and catalase activity of Thiocapsa sp. Ya-2003 cells was determined. Hydrogen sulfide at concentration of 6 mM inhibits the investigated sulfur bacteria cell enzymes.