[Oxidation of dibenzofuran by Pseudomonas strains harboring plasmids of naphthalene degradation]. / Okislenie dibenzofurana shtammami Pseudomonas, nesushchimi plazmidy biodegradatsii naftalina.

Pseudomonas strains harboring plasmids pBS3, pBS4, NAH7 were shown to carry out initial transformation of dibenzofurane to 4-[2'-(3'-hydroxy)-benzofuranyl]-2-keto-3-butenic acid due to broad substrate specificity of the enzymes of naphthalene catabolism nahA, nahB, nahC and nahD. These strains did not grow on dibenzofurane because of the inability of the enzyme nahE to split pyruvate of 4-[2'-(3' hydroxy)-benzofuranyl]-2-keto-3-butenic acid, which leads to accumulation of the latter. The strains harboring plasmids pBS2 and NPL-1 are not capable of any transformation of dibenzofurane.

[The primary stages of alpha-methylstyrene degradation by a culture of Pseudomonas aeruginosa 8]. / Pervichnye étapy degradatsii al'fa-metilstirola kul'turoi Pseudomonas aeruginosa 8.

The transient products have been characterized of alpha-methylstyrene (AMS) degradation by P. aeruginosa st. 8 which utilizes AMS in high concentrations (2-10 g/l) as the only source of carbon and energy. The existence of two pathway of AMS catabolism has been demonstrated. The minor pathway is connected with accumulation of nonmetabolized products of an isopropenyl fragment. The main pathway leads through formation of hydroxylation products with subsequent meta-cleavage of aromatic ring. A possible participation of wide-specific meta-pyrocatechase in AMS catabolism has been discussed.

[Catabolism of biphenyl by Pseudomonas putida BS 893 strain containing the biodegradation plasmid pBS241]. / Katabolizm bifenila shtammom Pseudomonas putida BS 893, soderzhashchim plazmidu biodegradatsii pBS241.

The isolation and identification of biphenyl catabolism products in Pseudomonas putida BS 893 (pBS241) showed the presence of benzoic, m-hydroxybenzoic and cinnamic acids. The two latter compounds were not found in biphenyl degradation by other bacterial strains. P. putida BS 893 (pBS241) differed from other biphenyl-positive Pseudomonas strains in the enzyme activity. These differences may stem from peculiarities in the pathway of biphenyl catabolism controlled by plasmid pBS241.