Figure 3

Intracellular keto-deoxy-L-galactonate concentrations. Intracellular concentrations of keto-deoxy-L-galactonate (left) produced by A. niger ΔgaaC (solid symbols) and T. reesei Δlga1 (open symbols) when maintained in bioreactors at constant pH 5.5 on 17-19 g D-galacturonate l^-1 at 30°C, and the correlation to extracellular keto-deoxy-L-galactonate concentration (right) when D-galacturonate was still present in the culture supernatant. 4.2 g D-xylose l^-1 and mineral salts were added to the T. reesei culture but not to the A. niger culture. Cultures contained approximately 2 g biomass l^-1. Error bars represent ± SEM and lines indicate trends in the data.