Reactivated and protective effect of red light on the yeast cells inactivated by UVC-irradiation

Data on the protective effect of low intensity and reactivates the red light on the yeast, inactivated by UVС light are obtained. The presence in yeast cells photoprotective system, effective in the presence of yeast cells, the dimeric nature of the injury and damage resulting by photodynamic mechanism in the ge-netic apparatus of cells with endogenous photosensitizers is shown. The similarity in photoreduction ef-fects for yeast cell viability when they are inactivated both with UV irradiation and visible light indicates that they are based on an identical, previously unknown, photo-induced reactivating mechanism, which is not specific in respect to the nature of lethal damage.