Fig. 4From: Continuous enhancement of iturin A production by Bacillus subtilis with a stepwise two-stage glucose feeding strategyTime courses of pH and DO with different glucose feeding rates. Graphs show a time course of pH and DO and its correlation with different glucose feeding rates during fermentation. F=0 g/L/h (a), F=0.28 g/L/h (b), F=0.56 g/L/h (c) and F=1.12 g/L/h (d). Solid black lines: DO; solid red lines: pHBack to article page