FIG. 4.

Growth-dependent expression of cspH at 37°C. (A) Northern hybridization with cspH-specific probe at OD₆₀₀s of 0.15 (lane 1), 0.3 (lane 2), 0.6 (lane 3), 0.9 (lane 4), and 1.3 (lane 5). Northern hybridization of 16S rRNA was shown as a control for equal amounts of total RNA. (B) β-Galactosidase with YH1 at each growth phase. YH1 was diluted after overnight culture with fresh LB medium and cultured until each growth phase. At each interval, β-galactosidase activities were measured. dilu, β-galactosidase activity at the point of dilution with fresh medium after overnight culture. Error bars, standard errors.