The Action of the Free Radicals on DNA and Anti-radical Defence Mechanisms

摘要

The secret to the survival of the organisms, the adaptation to high concentrations of free radicals (FR), consists in finding and adopting oxidative substances. When the radical species are not destroyed properly, there is what the bio-medical literature calls oxidative stress. Adapting to relatively high concentrations of 02 has been done by selection and the incorporation of some anti-oxidant systems, enzymatic and non enzymatic. If we can talk about the existence of a strategy in the antioxidant action, it consists in sacrificing these substances to protect some molecules of biological importance.