TABLE 2.

Maximum specific growth rate in BHI broth at 30°C of wild-type L. monocytogenes strains and derived pediocin-resistant and nisin-resistant mutants^a

L. monocytogenes strain	μmax (h−1) at:
	pH 6.5 with:		pH 6.0 with:		pH 5.5 with:
	0% NaCl	3% NaCl	0% NaCl	3% NaCl	0% NaCl	3% NaCl
31	1.10	0.82	0.84	ND	0.66	0.34
31N2	1.06	0.74	0.86	0.62	0.70	0.52
31P	0.60∗	0.44∗	0.50∗	0.52	0.50	0.40
272	1.00	0.86	0.80	0.48	0.74	0.50
272P	0.54∗	0.48∗	0.48∗	0.36	0.44∗	0.30∗
322	0.82	0.46	0.58	0.40	0.54	0.40
322N2	0.58∗	0.44	0.48	0.28	0.32∗	0.30
358	0.90	0.76	0.78	0.52	0.60	0.46
358N	0.72∗	0.60	0.58∗	0.44	0.44∗	0.36
412	0.94	0.76	0.80	0.64	0.58	0.42
412N	0.96	0.72	0.72	0.58	0.50	0.38
412P	0.54∗	0.46∗	0.54∗	0.44∗	0.46∗	0.46
412NP	0.62∗	0.42∗	0.52∗	0.36∗	0.42∗	0.38
ScottA	1.04	0.68	0.86	0.56	0.54	0.46
ScottA-Ln	0.52∗	0.42∗	0.50∗	0.44	0.40	ND
VDL144	1.08	0.74	0.90	0.64	0.66	0.52
GR9	0.54∗	0.50∗	0.42∗	0.44∗	0.38∗	0.48
GR10	0.48∗	0.50∗	0.42∗	0.44∗	0.38∗	0.48

^aPediocin-resistant strains are designated “P,” “Ln,” or “GR”. Nisin-resistant strains are designated “N.” Mutants with a significantly different (P < 0.05) maximum growth rate compared to the corresponding wild-type strain are indicated with an asterisk. ND, not determined.