Table 4. Axenic E. coli growth measured gravimetrically.

Substrate	E. coli productivity (mg/L/d)	Final E. coli density (mg/L)
Glucose
0 g/L	0.05 (0.91) c	1.5 (4.4) c
0.5 g/L	38.01 (0.53) b	194.5 (2.5) b
2 g/L	87.99 (17.91) a	439.1 (90.1) a
10 g/L	56.7 (0.80) b	288.3 (4.0) b
Glycerol
0 g/L	-	-
0.5 g/L	32.90 (1.00) b	171.8 (4.5) b
2 g/L	62.44 (3.16) a	320.7 (14.7) a
10 g/L	63.09 (1.94) a	325.2 (11.9) a
Acetate
0 g/L	-	-
0.5 g/L	22.12 (0.41) a	115.3 (1.9) a
2 g/L	40.04 (34.03)*	202.9 (170.3)*
10 g/L	1.27 (0.25) b	11.0 (1.6) b

Productivities are five-day averages. Mean values are followed by standard deviations in parenthesis. Within a batch, values connected by the same letter are not significantly different at the 0.05 level.

*Variability was too large to include this treatment in the multiple comparison.