Figure 1.
Substrate utilization rates (μmol min−1 gDW−1) of lactose and citrate during chemostat cultivation at constant growth rate (0.135 h−1) at different conditions: pH 5.5 or 7, in the presence (+) or absence (−) of citrate and under lactose or amino acid limitation. Filled and open bars represent lactose and citrate utilization respectively. Error bars represent the standard deviation of two biological replicates. Lactose and citrate were measured in duplicate using HPLC and enzymatic determination respectively.