Figure 6From: Improved productivity of poly (4-hydroxybutyrate) (P4HB) in recombinant Escherichia coli using glycerol as the growth substrate with fed-batch culture High cell density cultivation with exponential feeding mode. The feeding solution contained 40gL-1 Na-4HB, 300gL-1 glycerol, and 20gL-1 acetic acid. Controlled feeding rate was set for the cultures A, B and C at 0.02, 0.04 and 0.08h-1, respectively. Arrows represent the start of feeding. The data are the average numbers of duplicates.Back to article page