Figure 5From: Stepwise metabolic adaption from pure metabolization to balanced anaerobic growth on xylose explored for recombinant Saccharomyces cerevisiae Inhibition of anaerobic growth on xylose by pH (Panel A, B), acetate (Panel C, F), bicarbonate (Panel D, F) and citrate (Panel E, F). Panels A-E: Experimental data obtained for IBB10A02 and IBB10B05 are shown as empty and black bars (circles), respectively. Panel B: x-Axis indicates concentration of protons relative to standard pH (= 6.5) conditions, ([H+] = 10-pH – 10-6.5). Panel F: Quantitative representation of Panels C-E. Data obtained in the presence of acetate (full triangles), citrate (empty circles) and bicarbonate (full circles) are shown. Solid lines in Panel B and F represent best fits from linear regression analysis. Framed data were not considered in the analysis. To minimize effects on μ from change in pH over conversion time only the growth phase in which the pH shift was ≤ 0.5 pH units was considered in the calculations. Error bars indicate standard deviations obtained from two individual cultivations.Back to article page