Fig. 3

Effect of ammonium sulfate supplementation on cell growth, glucose consumption, and gamma aminobutyric acid (GABA) production. The Escherichia coli DGB201 and DGB202 strains were cultured in MR medium supplemented with 30 g/L glucose, 5 g/L yeast extract, and (0, 5, 10, or 15 g/L) ammonium sulfate. a Cell growth; b glucose consumption; c GABA production. Histogram shows the mean of three biological replicates and error bars represent standard deviation