Fig. 3.

Co-fermentation of glucose and xylose by a mixed microbial culture cultivated on xylose. The arrow indicates the moment when the substrate in the medium (xylose 0.133 Cmol/l) was replaced by a mixture of two substrates (glucose and xylose, both 0.067 Cmol/L): open square molecular hydrogen, filled square formate, filled circle acetate, open circle propionate, filled upright triangle butyrate, open upright triangle ethanol and × biomass