单词	semiquinone
释义	semiquinone /ˌsɛmɪˈkwɪnəʊn / noun Chemistry 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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