Semiquinone

Semiquinone (or ubisemiquinone) is a free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone to quinone or alternatively the addition of a single H atom to a quinone. It is highly unstable. It is the first of two stages in reducing the supplementary form of CoQ10 ubiqui...
Found on http://en.wikipedia.org/wiki/Semiquinone

semiquinone

A free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone to quinone or similar compound (e.g., flavin mononucleotide). ... (05 Mar 2000) ...
Found on http://www.encyclo.co.uk/local/20973

semiquinone

Type: Term Pronunciation: sem′ē-kwin′ōn Definitions: 1. A free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone to quinone or similar compound (flavin mononucleotide).
Found on http://www.medilexicon.com/medicaldictionary.php?t=80862
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