FIG. 2.

Expression of the bgl operon in rpoS mutants. Cells carrying the rpoS and hns alleles as indicated were grown at 37°C to the mid-logarithmic phase in TB medium containing 5 mM β-methyl-d-glucoside, an inducer for the bgl operon. β-Galactosidase activity expressed by bgl-lacZ was measured by the method of Miller (11). Each value is the mean + standard deviation from four independent assays. WT, wild type.