Development of toxic manifestations in rats under conditions of hyperoxia was accompanied by a significant lowering of the rat erythrocyte superoxide dismutase activity. The incubation of control rats hemolysate with hydrogen peroxide (10(-3)M) or with kumole peroxide (1.6 10(-4)M) also led to pronounced fall of the initial erythrocyte superoxide dismutase activity. As supposed, the lowering of the erythrocyte superoxide dismutase activity under hyperoxia could be due to the formation of peroxidation products.

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