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Growth curves, pH profiles, glycerol utilization, and end-product synthesis profiles ofC. butyricumcultures with low (170 mM) and high (620 mM) initial glycerol concentrations. a) OD of cells in log scale versus pH values, b) residual glycerol concentrations versus 1,3-PDO concentrations, c) H2 and CO2 concentrations, d) lactate, acetate, butyrate and ethanol concentrations.
