[Dynamics of microbial populations in the biofilm on protective coating].

Dynamics of microbial populations in the biofilm on the surface of protective coating Poliken 980-25 has been studied. It was shown that in the process of succession one can observe some changes of taxonomic composition of biofilm bacteria. Bacteria of Pseudomonas genus were revealed at early stages of succession, they reduce Fe+3 and oxidize carbohydrates.

[Microbial biofilms on protective coatings of underground metal structures].

Biofilms are highly organized groupings which are formed by microorganisms of one or several species and consist of actively functioning cells, those at rest as well as of the forms which are not cultivated. The survey includes data concerning formation of biofilms and factors affecting the process of their development. The paper deals with the mechanisms of biofilms formation in bacteria and with the methods connected with obtaining and studying mutants of bacteria imperfect as to biofilms formation.

[Adhesion of sulphate-reducing bacteria to steel under cathode polarization].

Adhesion of different (as to their corrosion aggression) strains of sulphate-reducing bacteria to steel has been studied under cathode polarization at various potentials: -800, -900, -1000, -1200 mV. It has been established that cathode polarization differently affects the adhesion of strain of sulphate-reducing bacteria with various aggression to steel. Correlation between the bacterial strains aggression and the number of cells adhered to metal have been noted.

[Effect of corrosion inhibitor on adhesion of sulfate-reducing bacteria to steel and their production of exopolymer complex].

It was shown in the laboratory investigations that the cells of sulphate-reducing bacteria of both aggressive Desulfovibrio sp. strain Kiev-10 and nonaggressive Desulfovibrio desulfuricans strain Kiev-45 strains can produce exopolysaccharides (EPS). Plankton (freely floating) cells of sulphate-reducing bacteria produce greater quantity of EPS than the cells of the biofilm formed on steel.