Figure 2: Optical density (A), glucose (B) and formic acid (C) concentrations and pH (D) of shakeflask cultures of Y. lipolytica and S. cerevisiae. Y. lipolytica strain W29 was incubated with 42 mM glucose with (closed circles) and without (open circles) 25 mM formic acid, and both S. cerevisiae strains CEN.PK113-7D (closed squares) and CEN.PK556-7B (open squares) were incubated with glucose and formic acid. A sterile flask with glucose and formic acid was also included (dashed line, closed triangles). Some data points overlap: closed & open squares (A), closed & open circles and closed & open squares (B), closed & open squares & closed triangles (C, first three datapoints) and open square and closed triangle (C, last datapoint).