photoreˈactivate, v. Biol.
[f. photo- 1 + reactivate v.]
trans. To repair by photoreactivation.
| 1954 Biochim. & Biophys. Acta XV. 471 They [sc. the systems studied] are then photoreactivated and the reactivated complexes are again exposed to UV in order to determine their UV sensitivity. 1975 Nature 13 Mar. 160/1 Even though cells of the higher plants can photo⁓reactivate ultraviolet damage.., the absence of dark-repair capability could be a significant disadvantage. |
So photoreˈactivated, -reˈactivating ppl. adjs.; photoreactivating enzyme, any enzyme which catalyses photoreactivation. Also ˌphotoreactivaˈbility, the potential for photoreactivation; photoreˈactivable a., (of a biological system) capable of displaying photoreactivation; (of damage caused by ultraviolet irradiation) capable of being photoreactivated.
| 1953 Jrnl. Bacteriol. LXV. 252 (heading) Growth, respiration and nucleic acid synthesis in ultraviolet-irradiated and in photoreactivated Escherichia coli. 1958 Jrnl. Gen. Physiol. XLI. 463 (heading) Subcellular nature of the photoreactivating system. 1960 Ibid. XLIII. 592 This photoreactivating enzyme (PRE) is interesting for two reasons. First, it is a photoenzyme, and few enzymes involved in photochemical reactions are known at present. Second, it acts on DNA in vitro without depolymerizing it. 1961 J. A. Schiff et al. in Christensen & Buchmann Progress in Photobiol. vi. 290 Photoreactivability of the cells falls off rapidly when the cells are permitted to divide. Under non-dividing conditions, the cells remain completely photoreactivable indefinitely. 1965 J. Jagger in E. J. Bowen Recent Progress in Photobiol. ii. 61 Evidence for the photoreactivability of RNA. 1975 Nature 13 Mar. 160/1 Some types of excisable ultraviolet-induced DNA damage are not photoreactivable. 1975 [see photoreactivation]. |