[Protective and reactive effect of a cellular extract from propionic acid bacteria on Candida guilliermondii and Escherichia coli, inactivated by ultraviolet radiation].

Dialyzed soluble proteins of Propionibacterium freudenreichii subsp. shermanii cell extract (dialyzate) were found to exert a protective and reactivating effect on Candida guilliermondii and Escherichia coli cells inactivated by UV light of C and B ranges. Reactivation occurred when dialyzate was added to irradiated bacterial suspensions immediately after irradiation or 15 min afterwards. Some common features of dialyzate effect on irradiated prokaryotic and eukaryotic cells were established. No reactivation was observed when the cells were irradiated with the light of visible (400-600 nm) or entire optical (> 290 nm) ranges. The possible mechanisms of a reactivating effect of dialyzate are discussed.