Fig. (4) The acceleration of parameters of dissimilatory sulfate reduction depending on Desulfovibrio piger Vib-7 initial cell concentration in the medium (blue, red, brown, and orange line indicates the initial concentration of bacterial cells: 0.12±0.011, 0.25±0.024, 0.5±0.048, and 1.0±0.096 mg/ml, respectively).