FIG. 2.

Maltose transport capacities of cells from aerobic, maltose-limited chemostat cultures of S. cerevisiae CEN.PK113-7D as a function of culture age. Maltose transport capacity was measured indirectly by monitoring off-line uptake of protons after a pulse of maltose (25 mM). Since the ratio of the maltose-H⁺ symport system is 1:1 (55, 59), proton transport equals maltose transport capacity. Data are represented as averages ± mean deviations from three experiments with cells from independent chemostat cultures.