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β-Galactosidase activity exhibited by the acs::lacZ fusion carried by λCB7 as a lysogen of strains UQ285 [rpoD(Ts) rpoS+] and AJW1404 [rpoD(Ts) rpoS::Km]. Each lysogen was subjected to the temperature shift protocol described in the legend to Fig. 1. Open symbols, 32°C; closed symbols, 42°C; squares, strain UQ285; circles, strain AJW1404. Values are the mean ± standard error of the mean of at least three independent determinations.
