Growth kinetics of R. opacus Xsp8 on high xylose concentrations in flask cultures. Xylose concentrations of modified defined media with 1.4 g L-1 (NH4)2SO4 and 10 mg L-1 gentamicin were 40, 120, 160, 180 and 200 g L-1. Initial inoculum densities were adjusted photometrically to obtain an OD660 of 1.0. Values and error bars represent the mean and s.d. of triplicate experiments.