[Effect of gamma-irradiation on some biological and physico-chemical properties of polyene antibiotics]. / Vliianie gamma-oblucheniia na nekotorye biologicheskie i fiziko-khimicheskie svoistva polienovykh antibiotikov

Deep effect of gamma-rays on polyenic antibiotics was studied. It was shown that gamma-radiation induced radiation-chemical oxidation of the substances. The chromatographic analysis showed that the levorin degradation products were identical to the polyenic products of the antibiotic oxidative destruction. As for mycoheptin and amphotericin B, destruction of their molecules to non-polyenic products was observed. It was found that toxicity of the levorin aromatic heptaen did not practically change after gamma-irradiation in high doses. The toxicity of mycoheptin and amphotericin B, non-aromatic heptaens increased after exposure to high doses of gamma-rays.

[Chlorlincocin kinetics in animals with a disordered hormonal balance]. / Kinetika khlorlinkotsina u zhivotnykh s narushennym gormonal'nym balansom

Distribution of chlorlincomycin in intact rats and animals with an impaired hormonal balance was studied. Estradiol or hydrocortizon acetate were administered repeatedly to the animals in large doses with a purpose of inducing pathological conditions. Chlorlincomycin was administered intravenously for 11 days in a dose of 15 mg/kg. The antibiotic levels in the blood serum and organs of the rats were determined at various intervals after the drug administration. The hormones induced changes in the sexual cycle. Hydrocortizon acetate markedly changed the animal weight and the weight coefficient of the internal organs. The kinetics of chlorlincomycin in the animals with hormonal impairments induced by estradiol or hydrocortizon acetate changed insufficiently as compared to that in the intact rats. Individual fluctuations in the antibiotic distribution was observed in the animals treated with hydrocortizon acetate. The levels of chlorlincomycin in the blood of the weakest animals were higher. No cumulation of the drug was noted.

[Functional state of the adrenal cortex in experimental animals administered leyorin and its sodium salt perorally]. / Funktsional'noe sostoianie kory nadpochechnikov éksperimental'nykh zhivotnykh pri peroral'nom vvedenii levorina i ego natrievoi soli

The effect of oral levorin and its sodium salt on the function of the adrenal cortex was studied experimentally on albino rats. The functional activity of the adrenal cortex was tested by the content of corticosterone in the peripheral blood determined fluorometrically. The results showed that levorin in a dose of 300 000 Unit/kg and its sodium salt in doses of 300 000 and 1 200 000 Units/kg used orally induced at definite periods of their administration a decrease in the corticosterone blood levels. At the same time a decrease in the weight coefficients of the thymus and prostate was observed.

[Effect of imbrimycin on the body of animals]. / Vliianie imbrimitsina na organizm zhivotnykh

Toxicity of imbrimycin administered orally and its local irritating effect was studied experimentally. Imbrimycin was diluted with flagosol for decreasing its local irritating effect on the mucosa of the eye conjunctiva and vagina of rabbits. Administration of imbrimycin suspension to albino rats in doses of 10 and 50 mg/kg for 14 days had no effect on the body weight, liver antitoxic function and pathomorphological indices. Oral administration of the drug to dogs in a dose of 10 mg/kg caused a decrease in the body weight, vomiting and diarrhea, had no effect on the dog blood picture and induced no pathomorphological changes in the inner organs. The local irritating effect of imbrimycin was found to be equal to that of azalomycin F. Flagosol significantly decreased the irritating effect of imbrimycin on the eye conjunctiva and the vagina mucosa.