TABLE 4.

Metabolite consumption and production rates and yields during anaerobic growth on 60 g/liter xylose^a

Strain	μ	rs	rxol	rg	ra	re	Yse	Ysxol
TMB 3420 (selected population)	0.079 ± 0.001	0.89 ± 0.03	0.12 ± 0.02	0.045 ± 0.005	0	0.32 ± 0.02	0.36	0.13
TMB 3421 (N272D/P275Q)	0.053 ± 0.08	0.57 ± 0.02	0.15 ± 0.02	0.018 ± 0.003	0	0.20 ± 0.02	0.35	0.26
TMB 3422 (N272D)	0.068 ± 0.04	0.62 ± 0.01	0.15 ± 0.03	0.017 ± 0.004	0	0.230 ± 0.003	0.37	0.24
TMB 3423 (P275Q)	0	0.097 ± 0.007	0.055 ± 0.009	0.0021 ± 0.0001	0.003 ± 0.003	0.017 ± 0.001	0.18	0.57
TMB 3424 (control)	0	0.06 ± 0.01	0.032 ± 0.008	0.002 ± 0.001	0	0.007 ± 0.002	0.12	0.53

^aμ, specific growth rate (h⁻¹); r, specific consumption/production rates (g/g[DW]×h): r_s, specific substrate consumption rate; r_xol, specific xylitol production rate; r_g, specific glycerol production rate; r_a, specific acetate production rate; r_e, specific ethanol production rate; Y, yields (g/g): Y_se, ethanol yield on consumed substrate; Y_sxol, xylitol yield on consumed substrate. The uncertainty of the determined rates equals the deviation of the mean of two biological replicates.