Recherches sur la lysogénie chez Bacillus thuringiensis et B. cereus

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Abstract
Forty-eight strains of B. thuringiensis and 12 strains of B. cereus were treated with UV light and mitomycin C. The former agent was the more effective inducer. B. thuringiensis produces at least 7 different phage particles with long, non-contractile tails. The frequencies of lysogeny and polylysogeny are 83 and 25%, respectively. Morphologically defective phages occur in 25% of strains, but 5 of them produce low MW bacteriocins. One strain of B. cereus harbors killer-particles. There is no apparent correlation between the presence of phage-like particles, phage sensitivity and serotypes, biotypes, or the origin of B. thuringiensis strains.