Figure 5: the O2uptake rate (OUR) of the two pilot scale fed batch fermentations with glucose only (PF1) and a 1:4.6 molar ratio of glucose: formic acid in the feed (PF2) (see Table 2).
Figure 6 presents the respiratory quotient of the two fermentations, which clearly shows the fast onset of formic acid dissimilation and its large impact on RQ after the start of co-feeding formic acid (starting around 12h) for PF2.