Growth and ethanol production of both strains in the presence or absence of the selected inhibitory compounds present in pine-wood biomass fermentations. Lines represent cell culture density measured at an optical density of 580 nm (secondary y axis). Bars represent ethanol concentration in g/L (primary y axis). The red, solid and blue, dashed lines and bars show data from XR122N and AJP50 at 4.0 × 105 cells/ml initial cell density. Growth and ethanol production in the (upper panel) absence of inhibitors and (lower panel) in the presence of all 13 inhibitory compounds are shown.