TABLE 2.

Growth rate-dependent control still operates in strains with decreased rrn gene dosage

Host	Lysogen	Promoter	β-Galactosidase activity		Slope (β-galactosidase vs μ)b
			Low μa	High μa
W1485	JV2978	wt	373	767	0.68
	JV2979	C-1T	755	777	0.02
ΔBAGH	JV2978	wt	774	1,210	0.59
	JV2979	C-1T	1,050	1,060	0.02

^aGrowth rates (in doublings per hour) in MOPS (morpholinepropanesulfonic acid)-glycerol media with 0.4% glycerol (low growth rate) were 0.55 for W1485 and 0.49 for ΔBAGH. Growth rates in LB media (high growth rate) were 1.6 for W1485 and 1.3 for ΔBAGH. 

^bPlots were scaled to 1.0 at a μ of 1.0 as follows. Growth rate slopes were determined by linear regression analysis. β-Galactosidase activities at a μ of 1.0 were then scaled to a value of 1.0. Absolute activities were divided by the scaling factor and replotted. The final slope was then determined by linear regression on the scaled values.