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Biomedical subjects

O N Davydov

Publications and source records attributed to O N Davydov.

9 recordsLinked to original sources
PubMedDate not supplied

[The dynamics of the immunologic indices of carp exposed to methylene blue].

Several immunological and haematological indices as well as infection of carp with ectoparasites of the Dactylogyrus genus have been studied in fish that have been subjected to methylene blue treatment, to infection with Rhabdovirus carpio and Aeromonas hydrophila in different combinations. A dosage of 0.05 mg/l (exposure lasting for 3 days) over 20 days increases most of the immunological indices. A treatment of the carp with drug (dosage of 100 mg/l) for 4 hours has a stimulating effect on the immune system over a period of 40-60 days. The infection of the carp with virus immediately after the drug treatment (dosage 100 mg/l) gives rise to a disease of a certain part of fish. In connection with this a problem on terms of the methylene blue treatment is discussed taking into account the development of the disease.

Aeromonas↗
PubMedDate not supplied

[Yeasts contaminating salmon roe].

Quantitative and species compositions of yeast contaminating eggs, fry and fingerlings of Salmo gairdneri Rich under artificial breeding have been studied. Prevalence of species of genera Candida, Rhodotorula, Cryptococcus and Debaryomyces is noted. Yeast isolated from perished eggs and sick fry do not possess pathogenic properties. Certain strains of yeast make stimulating effect on the studied microorganisms.

Animals↗
PubMedDate not supplied

[Study of the cumulation, desorption and mechanism of action of organochlorine pesticides on fish cestodes].

The distribution of residues of DDT and its metabolites (DDD and DDE) in tissues of Triaenophorus nodulosus and its host was studied. It has been noted that cestodes can accumulate chlororganic substances in great quantity. The ability of Bothriocephalus gowkongensis has been established to dechlorate pp-DDT and to excrete pp-, op- and mp-DDD from the organism. Pp-DDT decreases the glycogene content and causes the rise of amylolytic activity in the above cestodes in acute tests. The effect of pp-DDT on the locomotor activity of cestodes is of two-phase character. The first one is associated with the muscular influence, the second one-- with neurotrophic effect. A high toxicity of mp-DDD )0.1 mg/l) for the locomotor activity of cestodes as compared with the effect of pp- and op-DDD was revealed.

Absorption↗