Activation by light of something or of some process previously inactive or inactivated; e.g., pyrimidine dimers, formed in polynucleic acids by the action of UV light, can be monomerized by UV light of a different wavelength via DNA photolyase.

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pho·to·re·ac·ti·va·tion -rē-.ak-tə-'vā-shən n repair of DNA (as of a bacterium) esp. by a light-dependent enzymatic reaction after damage by ultraviolet irradiation
pho·to·re·ac·ti·vat·ing -'ak-tə-.vāt-iŋ adj

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pho·to·re·ac·ti·va·tion (fo″to-re-ak″tĭ-vaґshən) reversal of the biological effects of ultraviolet radiation on cells by the action of light-dependent enzymes, as in the repair of DNA by the monomerization of dimerized pyrimidines; such repair can impair the efficacy of ultraviolet disinfection. Called also photoreversal.

Medical dictionary. 2011.

Look at other dictionaries:

  • photoreactivation — photoreactivation. См. фотореактивация. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • photoreactivation — fotoreaktyvacija statusas T sritis augalininkystė apibrėžtis Ultravioletinės spinduliuotės sukeltų pažeidimų gydymas matomąja šviesa. atitikmenys: angl. photoreactivation rus. фотореактивация …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • photoreactivation — noun Date: 1949 repair of DNA (as of a bacterium) especially by a light dependent enzymatic reaction after damage by ultraviolet irradiation • photoreactivating adjective …   New Collegiate Dictionary

  • photoreactivation — (fo to re ak tī va shun) The process in which blue light is used by a photoreactivating enzyme to repair thymine dimers in DNA by splitting them apart …   Dictionary of microbiology

  • photoreactivation — /foh toh ree ak teuh vay sheuhn/, n. Biochem. a process that repairs DNA damaged by ultraviolet light using an enzyme that requires visible light. [1945 50; PHOTO + REACTIVATION] * * * …   Universalium

  • photoreactivation — noun The reactivation of something by light …   Wiktionary

  • photoreactivation — pho·to·reactivation …   English syllables

  • photoreactivation — A light dependent DNA repair process …   Glossary of Biotechnology

  • photoreactivation — …   Useful english dictionary

  • photoreactivation reaction — Partial reversal of damage to biological systems by ultraviolet light by longer wave length light …   Dictionary of invertebrate zoology

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