Specific glucose uptake rate (qS) in aerobic, steady-state, glucose-limited chemostat cultures of P. pastoris grown at different dilution rates. Linear regression was used to calculate the maintenance coefficient, mS (intercept with the y axis), and maximum biomass yield on glucose, YX/Smax (reciprocal of the slope). The R2 value of the regression line was 0.99, and the standard error of the maintenance coefficient was determined by the LINEST function to be 23%.