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Biomedical subjects

A F Davydov

Publications and source records attributed to A F Davydov.

12 recordsLinked to original sources
PubMed1975

[The relationship between temperature adaptation and the effect of noradrenaline on central control of thermoregulation].

In rats cold--adapted (1--3 degrees C) or warmth--adapted (26--28 degrees C) for 4--5 weeks, the body temperature, oxygen uptake, electric muscle activity were continuously recorded before and after intraventricular injection of noradrenaline (NA) at a total volume of 5--8 mcl. At the ambient temperature of 25 degrees C, extremely small doses (5--8 mcg) of NA raised the body temperature due to shivering. Injections of NA were more effective in the cold--adapted rats. Injections of NA at a low ambient temperature (10 degrees C) evoked greater thermoregulatory responses in the warmth-adapted rats.

Adaptation, Physiological↗
PubMedDate not supplied

[The role of external respiration and blood circulation in heat emission during exposure of Taurotragus oryx canna antelopes to solar heat].

Experiments have been made on 4 elands at the age of 3--4 months, mean body weight 78 kg. At ambient temperature 31.5degrees combined with solar radiation, polypnoe was observed in the animals. Under these conditions, only small changes in the body temperature were observed, although skin temperature became 4--6degrees higher than in the morning. Heat production was 10% lower than that at 22.5degrees. The animals eliminated about 8% of metabolic heat through respiration in the morning and about 7%--in the afternoon.

Animals↗
PubMedDate not supplied

[Effect of cold on catecholamine concentration in the great pectoral muscle of sparrows].

Birds (Passer montanus, P. domesticus, Fringilla coelebs) kept in open-air cages in Leningrad during winter, do not differ in total catecholamine content from avian species (P. domesticus, Serinus canaria) which were kept under laboratory conditions at 15--20 degrees. In the sparrow P. montanus, no significaut seasonal changes were observed in catecholamine content; however repetitive cooling up to--10 degrees only at night increased twice the content of catecholamines (especially, noradrenalin) in the pectoral muscle.

Animals↗