Figure 4From: Enhanced production of gamma-aminobutyrate (GABA) in recombinant Corynebacterium glutamicum by expressing glutamate decarboxylase active in expanded pH range Effect of pH on cell growth and GABA production in flask cultivation of C. glutamicum . (A) Time profiles of cell growth and pH change at four different pH conditions. Triangle, circle and square symbols indicate the pHÂ 4, pHÂ 5 and pHÂ 6, respectively. The open and closed symbols indicate the cell density and pH change, respectively. (B) Time profiles of GABA concentrations during cultivations. Triangle, and circle and square symbols indicate pHÂ 4, pHÂ 5 and pHÂ 6, respectively. Each point represents the average of three independent experiments.Back to article page