сульфатвідновлювальні бактерії

The paper describes the synthesis of a set of new 2,3-dihydroimidazo[1,2-a]pyridinium bromides which demonstrate antibacterial properties against sulfate-reducing bacteria of Desulfomicrobium and Desulfovibrio strains and inhibit their functioning in the binary culture under the steel microbial corrosion. The compounds demonstrate antibiofilm and anticorrosive properties in the medium with sulfate-reducing bacteria, steel anticorrosion rate is up to 70.6 %.

The production of silver nanoparticles was carried out in an aqueous medium treated by discharge of the contact non-equilibrium low-temperature plasma in the presence of sodium alginate (1.25–5.0 g/l). The formation of silver metal particles (to 100 nm) was confirmed by X-ray diffraction and IR spectroscopy analysis. The obtained colloidal solutions of silver nanoparticles lead to the formation of thinner biofilm under microbial corrosion of mild steel, initiated by sulfate reducing bacteria of Desulfomicrobium genus.

It has been showed that food additives E451 and E459 inhibit corrosion in neutral water-salt medium and additives E316, E631, E621, E631+E551, herbs and spices increased it up to 1.75 times. Under microbial corrosion condition, inducted by sulfate-reducing bacteria, inhibition action (up to 80.9%) was discovered only for additive E459. Other studied additives increased microbial corrosion up to 2.27 times. The presence of food additives in corrosive medium influences the quantity of sulfate-reducing bacteria in biofilm on steel surface.

New derivatives of N-(R-phenyl)-3-(4-methyl-1-piperazinyl)-1,3-thiazole-2(3H)- imine with the medium to high yields were synthesized by the Hantzsch reaction in the ethanol medium. The structure of target compounds was confirmed by elemental analysis and NMR spectroscopy. The antimicrobial activity of 1,3-thiazoline derivatives with the N-methylpiperazine moiety against sulfate-reducing bacteria of Desulfovibrio sp. М.4.1 strain was studied.

The microbiological composition of the biofilm, formed on the surface of sewage treatment constructions grids, and the seasonal variation in the number of its main components were examined. The strain Ch.5 was isolated and identified from the enrichment culture of sulfate-reducing bacteria. It was classified as belonging to Desulfomicrobium genus according to its physiological and biochemical characteristics.