Effect of photo- and nonphotoreactivated damages to E. coli cells exposed to UV-light (250-334 nm)

A relative contribution of photoreactivated (modified by visible light) and nonphotoreactivated (modified by temperature) damages to UV-irradiated (250-334 nm) E. coli B cells was estimated. The contribution of damages modified by temperature to a lethal effect of UV-radiation was invariable within the range from 250 to 334 nm. The photoreactivation of E. coli B cells was also independent of λ-inactivating UV-light within 250-313 nm, and its value excessed that of the wild-type E. coli WP2 which did not vary by the mode of UV-damages repair. Moreover, in contrast to E. coli B. cells, the value of the photoreactivation of E. coli WP2 decreased, as λ-inactivating UV-light increased from 250 to 313 nm