Figure 1. Fitting (continuous line) of the experimental data to a kinetic model for substrate depletion (), growth () and polygalacturonases production (), at initial pH of 3.5 (a and c) and 5.0 (b and d) with glucose (a and b) and pectin (c and d) as carbon source. Dotted lines represent confidence intervals for the model estimations of S, x and p. Solid markers () are pH evolution in the culture.