FIG. 4.

Effects of global regulators on the transcription of sra. Cells of KY1461 lysogenic for λpF13(Psra-lacZ) and containing either rpoS, fis, hns, ompR, or relA and spoT mutations and cells of KY1461 wild type or containing cya or hip and him mutations and carrying pFF6(Psra-lacZ) were grown at 37°C in EP medium. Cultures in either the exponential phase (optical density at 600 nm, 0.4) or the stationary phase (after 24 h) of growth were assayed for β-galactosidase activity, expressed relative to that of wild-type cells in the stationary phase.