[Antibiotic properties of the Pseudoalteromonas genus bacteria isolated from the Black Sea water and molluscs].

Antagonistic properties of 41 strains of Alteromonas-like bacteria isolated from the Black Sea water and molluscs have been studied. Being grown on the rich medium "B" for marine bacteria, 21% of strains have shown high antagonistic activity against phytopathogenic fungi; 6% of strains inhibited the growth of Bacillus subtilis, Proteus vulgaris and Candida albicans. Spectrum of antagonistic activity was essentially changed on synthetic "BM" medium with acetate, glutamate, alpha-alanine as a single source of carbon and was directed against Pseudomonas aeruginosa. Culture liquids and acetone extracts of microbial biomass of 34% of the studied strains have shown activity against bacteria, fungi and cyanobacteria. Strains producing the wide spectrum of antimicrobial substances (Alteromonas macleodii, Pseudoalteromonas citrea, P. haloplanktis, P. aurantia, Pseudoalteromonas sp.), fungicidal and algocidal substances have been found. Both extra- and intracellular metabolities of marine bacteria (including the pigments) were active.