[Compensatory reactions of the rabbit respiratory system to hypoxic stimulation in hyperbaric conditions].

Two series of experiments were performed with awake rabbits to study ventilatory reactions of the respiratory system to hypoxic stimulus. Two types of tests included alternating exposure to hypoxic mixture with 14%, 12%, and 10% of O2 (for 10 min) and rebreathing (12% O2 + 4.5% CO2) with concurrent sampling of arterial blood for gas analysis.

[The characteristics of the reaction of the rabbit respiratory system to CO2 under hyperbaric conditions].

Under the increase of the nitrogen-oxygen mixture pressure from 6.13 to 30.0 kg/cm2, the respiratory response to a hypercapnic stimulus weakened in alert rabbits: the total increase of the lung ventilation decreased, and the ventilatory response of the respiratory system in hyperbaric conditions occurred in great values of the PaCO2.

[Changes in the content of rat brain polyphosphoinositides after exposure to high partial pressures of helium and nitrogen].

Effect of the medium with high partial pressure of helium and nitrogen on the content of di- and triphosphinositides in the rat brain great hemispheres. The stay of the rats in helium-oxygen mixture under the pressure of 40 kg/cm2 for 1 h is accompanied by the true decrease in the content of the both components of polyphosphoinositides whose value does not depend on the decompression conditions. Nitrogen-oxygen mixture under the pressure of 15 and 25 kgf/cm2 also evokes a decrease of the content of di- and triphosphoinositides.

[The effect of different gas mixtures under increased pressure on the self-stimulation reaction of rabbits].

Self-stimulation of rabbits in heliox at high pressure was decreased. That effect was potentiated by rapid compression. Addition of 2% or 6% nitrogen to heliox exerted no influence on the self-stimulation behavior.