Figure 3.

Growth and transcriptional activity of the xylose operon in B. licheniformis under glucose stress. ■—■, OD₆₀₀, ▄, relative expression. The appropriate time point at each phase was selected to manually increase glucose concentration to the desired concentration during the fermentation process, with the transcriptional activity assessed after 1 h. The desired concentrations are as follows: A, 0 g/L; B, 20 g/L; C, 50 g/L; D, 80 g/L; E, 120 g/L; F, 180 g/L; G, 200 g/L. Results are expressed as mean of replicates, bars with *** represent statistically significant differences between groups at p < 0.001.