Studies on lysogenesis. II. The effect of temperature on the lysogenization of Shigella dysenteriae with phage P1.

Sensitive bacteria, when infected with a temperate phage, either lyse or become lysogenic. With the temperate phage Pl and its host Shigella dysenteriae, the outcome of infection is affected strikingly by temperature. The discovery of this temperature effect has allowed us to study some features of the lysogenization process; these will be described in this paper. The definitions of certain terms and a general discussion of the problems involved in the study of lysogenesis were given in a previous paper (Bertani, 1953a; see also Benzer et al., 1950).