FIELD: oil industry. SUBSTANCE: proposed biopreparation consists of highly active living aerobic oil-oxidizing bacterium (Mycobacterium, Pseudomonas etc.) grown on the solid substrate-carrier at titers 2,5-7×109 cell/ml depending on the genus and species of bacteria used. Ammonium oxalate (0.05-1.0%) and normal paraffins (1.0-1.5%) were added additionally to the substrate-carrier. Biopreparation does not show pathogenicity, does not pollute environment, useful at the storage and transporting. Useful life is 6 months at 10-15 C. EFFECT: increased oil-oxidizing activity, high titer maintenance during storage. 4 cl, 6 tbl
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