from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry An intermediate free radical generated in the conversion of quinones to/from hydroquinones.


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  • Cytochrome P-450-like hemeproteins that contain a flavin semiquinone radical.

    Recently Uploaded Slideshows 2009

  • EPR analysis revealed that characteristics of the semiquinone radical of bound MQ are similar to those of the semiquinone radical of bound UQ and indicated an electron flow from PQQ to MQ as in the case of UQ.

    Journal of Biological Chemistry current issue G. Mustafa 2008

  • The essential role of the reductase domain can be characterized, similarly to the reductase domain of Cyt-P450, as accepting electrons from a two electron donor (NADPH) and shuttling them to a single electron acceptor (haem) by forming stable semiquinone intermediates.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008


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