Fig. 5

Time course of fed-batch fermentation under different conditions. (A) Time course of PN titer, OD₆₀₀ and DO (%) of fed-batch fermentation I. (B) Time course of the pyridoxine titer, OD₆₀₀ and DO (%) of fed-batch II. (C) and (D) Time course of the PN titer, OD₆₀₀ and DO (%) of fed-batch III with different C/N ratios. C, C/N ratio = 6.76; D, C/N ratio = 4.56. The black line indicates the trend of the OD₆₀₀, the red line shows the PN titer, and the purple line represents the DO (%)