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semiquinone

   Also found in: Wikipedia 0.01 sec.
semiquinone [‚sem·ē·kwə′nōn]
(organic chemistry)
A radical ion intermediate formed in the oxidation of a hydroquinone to a quinone.
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24-26) Second, superoxides react directly with catecholamines to produce semiquinone radicals and hydrogen peroxide; the former feeds into many other oxidant chain reactions, while the latter can mediate tissue injury by alkylative adduct formation or by redox cycling to produce other toxic oxidizing species.
The Dysox model of adrenal dysfunction and gender devolution: the ... by Ali, Majid / Townsend Letter
The data showed a signature typical of free radicals and similar to that of semiquinone, a free radical found in cigarette smoke.
Nanoparticles conspire with free radicals: dose of carcinogens could ... by Castelvecchi, Davide / Science News
Although a link between free radicals in these samples and health impacts was suspected, their potential health impacts were not recognized because they were thought to be "inaccessible to cells and too stable to play any part in carcinogenesis" until the publication of a series of papers by Pryor and colleagues demonstrating the viability of catalytic cycles involving semiquinone radicals (Pryor and Squadrito 1995; Pryor et al.
Origin and health impacts of emissions of toxic by-products and fine ... by Dellinger, Barry / Environmental Health Perspectives
 
 
 
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