Table 1. Doubling times (in minutes) of an rpoS strain in different backgrounds on poor N and S sources.

Strain	Genotype		Arginine	glutathione	taurine	Hepes	lanthionine
NCM3964	zih-102*	60	230	120	70	70	55
NCM3890	rpoS*	60	180	180	80	80	70
NCM3963	zih-102†	75	630	90
NCM3962	rpoS†	70	260	200

Cells were grown in N^-C^- or N^-C^-S^- minimal medium with glycerol (0.4%) as the C source. The N sources (10 mM total N) and S sources (0.25 mM total S) were as indicated. Doubling times with glucose (0.2%) [or lactose (0.2%)] were: 50 min for NCM3964 and NCM3890 and 65 and 60 min, respectively, for NCM3963 and NCM3962.

^*The strain carries a Tn10 insertion in the background of NCM3722

^†The strain carries a Tn10 insertion in the background of MG1655 (CGSC 6300) [also known as NCM3105 (5)]