FIG. 5.

Heat stress resistance of the wild-type and devR mutant strains of M. smegmatis. The strains were grown under either carbon (A) or oxygen (B) starvation conditions and at 24 h after entry into stationary phase were shifted to 55°C at time zero. Samples were taken at 90-min intervals up to 7.5 h and plated on rich media. Symbols: □, wild-type strain mc²155; ▿, devR mutant OTL1. All experiments were performed by using three independent cultures, and the error bars represent the standard deviation.