Fig. 1. Effect of the addition of ammonium phosphate to the agave juice fed to S. cerevisiae S1 chemostat culture (at D = 0.08 h−1), on the consumptions of reducing sugars (□) and ammonium phosphate (◊). First addition: 1 g/L; second addition: 2 g/L; third addition: 3 g/L; fourth addition: 4 g/L.