Figure 2.

Extracellular metabolite concentrations for batch cultivation. Concentration of (a) 2,3-butanediol, (b) ethanol, (c) acetate and (d) glycerol at the end of batch cultivation under microaerobic conditions. Plus or minus signs indicate presence or absence of the corresponding gene deletion. The first column corresponds to the wild-type strain. Error bars represent standard deviations associated with four independent experiments (except for strains B2C-a1, B2C-a1a5a6, B2C-a1a3a5a6g2, where n = 3; and for strains B2C-a1a3a5 and B2C-a1a3a6, where n = 2).