Definition of semiquinone in English:
A compound derived from a quinone, in which one of the two oxygen atoms is ionized or bonded to a hydrogen atom.
- Hypericin is a dianthraquinone that exhibits powerful phototoxicity through apoptotic and necrotic pathways and generates singlet oxygen, superoxide anion radicals and semiquinones.
- The transfer of one electron from an electron donor to an excited state of hypericin generates its corresponding semiquinone radical anion.
- The simple solutions found here for individual S-states, semiquinone, and oxygen evolution provide a basis for quantitative description of the charge accumulation processes at the donor and acceptor sides of PSII.
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