[Biochemical composition of a surfactant and its free radical processes in hyperbaric oxygenation and in the post-hyperoxic period].

Monitoring was made to examine the lungs. With this mode of hyperbaric oxygenation (0.3 MPa for 5 hours), rats developed mild oxygen intoxication which alleviated on day 3 and ceased on day 7 after its exposure.

[Free-radical processes in the lung tissue of rats under hyperbaric oxygenation and in the posthyperoxic period].

An increased antioxidation enzyme activity and a low level of the peroxidation products were revealed in exposure to low oxygen pressure and 1 to 7 days after it in rats. The data obtained suggest presence of a powerful antioxidant system in the rat lung.

[ATPase activity of subcellular rat brain fractions following hyperoxia].

The total Mg2+-ATPase and Na+, K+-ATPase activity was studied in the fractions of "400 g X for 20 min" and "900 g X for 30 min" conditionally called the fraction of the external cellular membranes and total fraction of mitochondria. The subcellular fractions were isolated from great hemispheres and stem part of the rat brain. The brain of control animals and those during a severe spasmodic attact induced by the oxygen action at a pressure of 6 ati was studied.