An attempt to photoreactivate ultraviolet inactivated streptococci.

Kelner (Sci. American, 184, 22, 1951) reported that the reactivation spectrum for Streptomycee gri8eu is very similar to the absorption spectrum for iron porphyrin systems, while that of Escherichia coli is somewhat different. Latarjet et al. (J. Gen. Physiol., 35, 455, 1952) reactivated irradiated microorganisms by catalase, and Berger et al. (J. Bacteriol., 65, 539, 1953) found that sodium azide prevented photoreactivation of E. coli, Chromobacterium violceum and Micrococcus pyogenes. This note reports attempts to photoreactivate Streptococcu faecaliu strain 10Cl and Streptococcu latis strain L21S, organisms lacking iron porphyrin systems. E. coli strain B/r and Aerobacer aerogenes strain 600 were used as controls.