univalent reduction

univalent reduction

a phenomenon during intracellular metabolism involving oxygen-reduction reactions in which superoxide radicals are produced because oxygen accepts electrons only one at a time. In the short period between acceptance of the first and second electrons, one electron is unpaired and oxygen is a superoxide radical. The superoxide may then be converted to a second free radical.
References in periodicals archive ?
Reactive oxygen species are cytotoxic due to the intermediate formed from univalent reduction of molecular oxygen, including the superoxide radical ([O.
Whereas the foregoing observations emphasize oxygen production and univalent reduction in algae, oxygen derived from the ambient medium may also undergo univalent reduction in the animal.
1992; Lesser, 1996) that can participate in univalent reduction of available molecular oxygen, rather than by the supply of molecular oxygen itself.