Fig. 4
From: Efficient ammonia production from food by-products by engineered Escherichia coli
Effects of ptsG and glnA disruption on glucose uptake (a) and ammonia production (b) in the M9-yeast extract medium with 50 mM glucose. Glucose uptake and ammonia production was measured 2 h and 26.5 h after the start of incubation at 37 °C in the M9-yeast extract medium, respectively. Values are expressed as the mean ± SD (n = 3). Statistical significance was determined by Tukey’s test (*P < 0.05, **P < 0.01)