[Changes in functional organization of the respiratory system among residents of West Siberia in the winter season].

The study examines respiratory parameters in healthy young males from Western Siberia. The correlations between the parameters are analyzed and the functional structure of the respiratory system in the summer and in the winter is identified. It was discovered that different regulatory programs operate depending on the temperature of inhaled air.

[The protective reaction of external respiratory system to the long-term action of ecological factors].

Analyzes physiological manifestations and mechanisms of defense reaction of the external respiration system in response to two ecological factors: low air temperature and dust. Clinically healthy men (without clinical and laboratory signs of lung disease) were examined, living or working under conditions of low temperature or high dust content in the air. These two factors cause mobilization of reserve tissue of respiratory compartments of the lungs by involving the reserve acini in ventilation.

[Spermatogenesis and the testosterone level in young male silver foxes in their reproductive period].

15.7% of spermatozoa were found to be abnormal in silver fox males during their first reproductive season. The total number of spermatozoa and the abnormal spermatogenesis remained unchanged during mating season.

[The reproductive function of young male silver foxes Vulpes vulpes after long-term selection for domesticated behavior].

Sperm morphology of spermaries, testosterone plasma level and sexual activity of young silver fox males selected for domestic behavior have been studied. It is established that a number of spermatozoa in semen of males from selected population is lower as compared with the control one, whereas abnormal spermatogenesis level is significantly increased. The testosterone plasma level in males after a female introduction increased to the same extent in both groups.