FIG. 3.

Variations in the CO₂ production rate by wild-type V5 (•) and mutant UV9 (○) and V5/ure2::kan (▾) strains in MS300 culture medium at 28°C in the absence (A and B) or in the presence (C and D) of 6 mg of dissolved oxygen liter⁻¹. The arrows indicate the time of dissolved oxygen addition for each strain. The CO₂ production rate patterns are represented as a function of fermentation progress (panels A and C) or of fermentation time (panels B and D). Final cell populations were 236 × 10⁶, 286 × 10⁶, and 293 × 10⁶ cells ml⁻¹ in the absence of oxygen and 235 × 10⁶, 340 × 10⁶, and 367 × 10⁶ cells ml⁻¹ in the presence of oxygen for V5, UV9, and V5/ure2::kan strains, respectively.