FIG. 7.

Fermentation of a dilute acid spruce hydrolysate by L⁺S^s (A) and L⁻S^s (B) at a high cell density. The consumption of glucose (▴) and mannose (■), the concentration of phenolic compounds (□), and the production of ethanol (⧫), glycerol (•), and biomass (○) (measured as optical density at 620 nm [OD 620]) were determined.