TABLE 1.

Kinetic parameters with amino acid as the only nutrient source^a

Parameter	Variable for indicated strain with noted incubation time
	E. coli ATCC 25922		C. freundii ATCC 8090 (1.5 h)
	1.5 h	4.5 h
Km (μM)	15.0 ± 7	223.6 ± 51.8	14 ± 2
KAA (μM)	13.5 ± 7	221.8 ± 49.7	10 ± 2
IntAA (μM)	1.5 ± 1.2	1.8 ± 0.5	3.8 ± 3
β-galAA=0 (% of Vβ-galmax)	5 ± 3	0.37 ± 0.32	14 ± 1
Vβ-galmax (10−8× U/cell)b	1.0 ± 0.4	40.3 ± 7.0
μmax (h−1)		0.94 ± 0.08
KAA-μc (μM)		122.3 ± 33.2

^aThe experimental points are expressed as means ± SD. See the legends for Fig. 1, 3, and 4a and b for the procedure and the text for the description of parameters.

^bStarting cells, i.e., the number of cells at the beginning of the experiment.

^cMichaelian constant relative to the mean growth rate.