TABLE 2.

Fermentation products formed by isolates 4-1 and 4-2a from xylan, pretreated wood, and xylose^a

Strain and growth substrate	Avg concn (mM) ± SD				Acetate/ethanol ratio
	Lactate	Formate	Acetate	Ethanol
4-1
Xylan	0.32 ± 0.03	3.63 ± 0.09	12.83 ± 0.43	0.79 ± 0.13	16.3
Xylose	0.21 ± 0.19	0	2.63 ± 0.76	0
Pretreated wood	0.88 ± 0.88	0.57 ± 0.17	10.28 ± 2.1	0.87 ± 0.3	11.8
4-2a
Xylan	0.43 ± 0.03	3.05 ± 0.13	12.18 ± 0.47	0.88 ± 0.15	13.7
Xylose	0.41 ± 0.06	0	2.85 ± 0.25	0
Pretreated wood	0.44 ± 0.43	0.22 ± 0.06	9.4 ± 1.47	0.91 ± 0.26	10.3

^aValues shown are averages of results from two replicas, each using 3 g/liter of each growth substrate.