Fig. 4
Effects of initial xylose concentration on isobutanol production in YZy197 fermentations. a Isobutanol overall yields at different xylose concentrations: Y = [IbOH]final/([Xyl]initial − [Xyl]final). b Isobutanol daily yields at different xylose concentrations: Y = ([IbOH]t=i − [IbOH]t=i−1)/([Xyl]t=i−1 − [Xyl]t=i). c Isobutanol daily productivities: Y = ([IbOH]t=i − [IbOH]t=i−1)/24 h. [IbOH] = isobutanol concentration in mg; [Xyl] = xylose concentration in g; and i = time point in daily (24 h) allotments. All data represent the mean ± SD of biological triplicates