Fig. 4

Correlation of overall oxygen consumption (OT, squares, red axes) and produced biomass (X, triangles, blue axes) to initial galacturonic acid concentration (\( {c}_{Gal{A}_0} \) and GalA₀ respectively). The colored data points correspond to the equally colored cultivations shown in Fig. 3. The galacturonic acid concentrations were determined via offline measurement. The OT is taken into account for the galacturonic acid consumption phase. A linear fit was plotted (dashed lines, arrows indicate corresponding axes). The reciprocal value of \( \frac{\nu_O}{\nu_S} \) can be substituted in Eq. (6). The calibration factors and coefficients of determination are specified in the plot