[The biology of bacteria used to treat industrial sewage to remove heavy metals]. / Biologiia bakterii, ispol'zuemykh pri ochistke promyshlennykh stochnykh vod ot tiazhelykh metallov.

The content of heavy metals in the water bodies increases as a result of anthropogenic effects. Heavy metals exert toxical effect on hydrobionts. Involved into the trophic chain they can be the cause of grave human diseases. Microorganisms possess a capacity to accumulate heavy metals in their body, evoke the process of their enzymatic transformation into nontoxical compounds and adsorb them on the cell surface. When breeding bacterial strains for the biological treatment of sewage from the metal-working plants the authors recommend to choose the cultures from econiches containing heavy metal compounds and to establish their resistance to high concentrations of metals. This resistance correlates with high biological activity. The bacterial strains of Pseudomonas genus possessing a capacity to sulphate reduction have been selected. As a result of their activity the high-solvable toxical sulphates are restored to practically unsolvable precipitating forms. A new species Aeromonas dechromatica transforming high-toxical six-valence chromium into low-toxical three-valent ones is described. The grounds of biotechnologies of the use of the breeded cultures for treatment of industrial sewage are stated.

[The sulfate-reducing capacity of bacteria in the genus Pseudomonas]. / Sul'fatvosstanavlivaiushchaia sposobnost' bakterii roda Pseudomonas.

Active sulphate-reducing microorganism which belongs to the genus Pseudomonas has been distinguished and described. The culture is a facultative aerobe, optimum Eh is -170-180 mV. Pseudomonas sp. being cultivated under strictly anaerobic conditions sulphate-reduction proceeds more intensively than under aerobic conditions. This fact should be taken into account under treatment of industrial sewage.

[Microflora of the low-mineralized waters of the Truskavets deposit]. / Mikroflora malomineralizovannykh vod Truskavetskogo mestorozhdeniia.

Waters of the Truskavetz deposit with a low content of mineral substances were found to contain considerable amounts of microorganisms; upto millions of cells per 1 ml. Sulphate-reducing, dentrifying and iron bacteria were detected in the waters. The following genera were represented and isolated: Pseudomonas, Bacillus, Nocardia, Arthrobacter, Brevibacterium, Corynebacterium, Micrococcus, Candida, Cryptococcus, Rhodotorula, Hansenula, Torulopsis, Trichosporon. Many of the studied strains assimilated C6--C10 and C12--C22 mixtures, industrial paraffins, naphthenic acids and their salts. The isolated bacterial and yeast strains were much more carbooligotrophic as compared to the museum strains of the same species; many of them were oligotrophic. The cells continued to grow in the course of storage of isolated water samples. The majority of isolated pure cultures grew upon inoculation into sterilized mineral water and caused a decrease in the content of organic substances.