[Biodiversity of sulfate-reducing bacteria growing on objects of heating systems].

It was shown that sulfate-reducing bacteria developed on the sections of Kyiv municipal heating systems, which are exploited in conditions of different temperatures. The bacteria were different as to their morphological and physiological properties. The bacteria of Desulfovibrio genus were revealed on the sections, which were exploited at a temperature of 35-40 degrees C and bacteria of Desulfomicrobium and Desulfotomaculum genera were revealed on the sections with a higher temperature such as 60 degrees C.

[Possibility of the plasmid transfer within bacteria - compounds of the sulfidogenic microbial community].

Extrachromosomal elements have been found within the isolates of ammonifying and iron-reducing bacteria obtained from the natural sulfidogenic community. These elements were small with size approximately 5-9 kb. Transconjugant strains Pseudomonas aeruginosa 27, P aeruginosa 28, P mendocina 29, Aeromonas hydrophila/caviae 30, harboured plasmids RP4 and R68.

[Lectin-binding analysis of the biofilm exopolymeric matrix carbohydrate composition of corrosion-aggressive bacteria].

The carbohydrate components of biofilms of corrosion-aggressive bacteria were studied by transmisstion electron microscopy using lectins labeled with colloidal gold. N-acetyl-D-glucosamine, N-acetyl-D-galactosamine, and neutral carbohydrates D-glucose and D-mannose were found within the exopolymeric matrix. Lectins with equal carbohydrate specificity demonstrated different degrees of interaction with the carbohydrate components of bacterial biofilms.

[Role of polymer complexes in the formation of biofilms by corrosive bacteria on steel surfaces].

The composition of exopolymer complexes (EPCs), synthesized by the monocultures Desulfovibrio sp. 10, Bacillus subtilis 36, and Pseudomonas aeruginosa 27 and by microbial associations involved in the corrosion of metal surfaces has been studied. An analysis of the monosaccharide composition of carbohydrate components, as well as the fatty acid composition of the lipid part of EPCs, was carried out by gas-liquid chromatography (GLC).

[Role of exopolymeric substances of corrosion-aggressive bacteria in the biofilm formation on the steel surface].

It had been done the comparative study of the exopolymeric substances (EPS) synthesized by the sulfidogenic microbial community and monocultures of Desulfovibrio sp. 10, Bacillus subtilis 36 and Pseudomonas aeruginosa 27 under various growth models as biofilm and plankton was performed. It was established that biofilm-produced exopolymers contained increased amount of glucose and fucose, while planktonic ones had more amount of mannose and rhamnose.