Figure 2. Effect of the pH on the r/r_max ratio (apparent maximum specific rate/maximum specific rate at the optimum pH) of nitrate reduction (C/N = 10, 37ºC) at an initial nitrate concentration of 80 mg NO₃^--N L^-1; 10 mg NO₃^--N L^-1; (¾). Fitting of the experimental data by the Michaelis function for 10 mg NO₃^--N L^-1 (R² = 0.94).