TABLE 2.

Specific substrate consumption rates and product yields for xylose and glucose fermentation at different steady states^a

Feed denomination (g/liter)	Substrate consumption rate (mmol of C h−1 g [dry wt] of cells−1)		Product yield (mmol of C of product/mmol of C of total carbohydrates)									% C recoverye
	Xylose	Glucose	EtOH	EtOHb (corrected)	EtOHc (on glucose)	XOH	XOHd (on xylose)	Acet	Glyc	Biomass	CO2
15 xylose + 5 glucose	−6.8	−15.1	0.34	0.45	0.65	0.12	0.39	0.006	0.078	0.11	0.23	98.2
10 xylose + 10 glucose	−4.7	−18.0	0.38	0.46	0.58	0.09	0.42	0.004	0.090	0.11	0.27	101.1
5 xylose + 15 glucose	−3.3	−22.7	0.37	0.50	0.58	0.03	0.24	0.004	0.094	0.09	0.26	98.6
0 xylose + 20 glucose	0.0	−23.8	0.39	0.53	0.53			0.004	0.085	0.10	0.29	100.6

^aThe total carbon concentration in the feed was 667 mmol of C/liter, or 20 g/liter. EtOH, ethanol; XOH, xylitol; Acet, acetate; Glyc, glycerol. 

^bEthanol yield was corrected by assuming that the missing percentage in the degree of reduction balance was due to evaporated ethanol. 

^cEthanol yield was calculated based on consumed glucose only. 

^dXylitol yield was calculated based on xylose only. 

^eC recovery includes the product yields calculated for total carbohydrates.