Table 2.

Summary of end-product yields, optimal growth temperatures, total molar reduction values of H₂ + ethanol (RV_EP), and growth conditions employed

Organism	Growth temp (°C)	End products (mol/mol hexose equivalent)							Growth condition	Ref
		H2	CO2	Acetate	Ethanol	Formate	Lactate	RVEP
Ca. saccharolyticus DSM 8903	70	4.0	1.8	NR	ND	ND	ND	4.0	Cont., 1.1 g l-1 glucose (D = 0.09 h-1)	[24]
		3.6	1.5	1.6	ND	ND	ND	3.6	Cont., 4.1 g l-1 glucose (D = 0.1 h-1)	[24]
		3.5	NR	2.1	NR	NR	NR	3.5	Batch, 10 g l-1 sucrose	[25]
		2.5	1.4	1.4	ND	ND	0.1	2.5	Batch, 10 g l-1 glucose	[26]
Ca. bescii DSM 6725	75	✓	✓	✓	NR	NR	✓	NA		[27,28]
P. furiosus DSM 3638	90	3.8	1.9	1.5	0.1	NR	NR	4.0	Cont, cellobiose (D = 0.45 h-1)	[29]A
		3.5	1.0	1.4	ND	NR	ND	3.5	Batch, 1.9 g l-1, maltose	[30]A
		2.9	1.9	0.8	0.1	NR	ND	3.1	Batch, 2 g l-1 maltose	[31]B
		2.8	0.9	1.2	ND	NR	ND	2.8	Batch, 3.5 g l-1, cellobiose	[30]A
		2.6	1.4	1.0	ND	NR	NR	2.6	Cont, maltose (D = 0.45 h-1)	[29]A
Th. kodakaraensis KOD1	85	3.3	1.8	1.1	NR	NR	NR	3.3	Cont, starch (D = 0.2 h-1)	[32]C
T. neapolitana DSM 4359	80-85	3.8	2.0	1.8	ND	NR	0.1	3.8	Batch, 2.5 g l-1 glucose	[33]
		3.2	NR	1.9	NR	NR	NR	3.2	Batch (N2 sparged), 7.0 g l-1 glucose	[34]
		2.4	NR	1.1	NR	NR	0.7	2.4	Batch, 1.1 g l-1 glucose	[35]
		1.8	NR	1.0	NR	NR	NR	1.8	Batch, 7.5 g l-1 glucose	[40]
		1.8	NR	1.5	NR	NR	NR	1.8	Batch, 7.0 g l-1 glucose	[34]
T. petrophila RKU-1	80	3.7	0.4	1.8	NR	NR	0.3	3.7	Batch, 1 g l-1 glucose	[36]
T. maritima MSB8	80	4.0	2.0	2.0	NR	ND	NR	4.0	Batch, 2 g l-1 glucose	[38]
		2.2	1.1	1.0	ND	NR	0.3	2.2	Batch, 3 g l-1 glucose	[39]
		1.7	NR	1.0	NR	NR	NR	1.7	Batch, 7.5 g l-1 glucose	[40]
Cal. subterraneus subsp. tengcongensis MB4	75	2.8	NR	1.4	0.6	NR	ND	4.0	Cont, starch (D = 0.27 h-1)	[42]
		NR	NR	2.0	ND	NR	ND	NA	Cont (N2 sparged), glucose (D = 0.24 h-1)	[42]
		0.3	1.5	1.0	0.7	NR	ND	1.7	Batch, 4 g l-1 glucose	[41]
E. harbinense YUAN-3 T	35	2.8	✓	0.7	1.1	ND	ND	5.0	Batch, 20 g l-1 glucose	[43]
C. cellulolyticum H10	37	1.6	1.0	0.8	0.3	ND	NR	2.2	Batch, 5 g l-1 cellulose	[44]
		1.8	1.1	0.8	0.4	ND	NR	2,6	Batch, 5 g l-1 cellobiose	[44]
C. phytofermentans ISDg	35-37	Major	Major	0.6	1.4	0.1	0.3	NA	Batch, 34 g l-1 cellobiose	[45]
		1.0	0.9	0.6	0.5	0.1	NR	2.0	Batch, 5 g l-1 cellulose	[44]
		1.6	1.2	0.6	0.6	ND	NR	2.8	Batch, 5 g l-1 cellobiose	[44]
C. thermocellum ATCC 27405	60	0.8	1.1	0.7	0.8	0.3	ND	2.4	Batch, 1.1 g l-1 cellobiose	[10]
		1.0	0.8	0.8	0.6	0.4	0.4	2.2	Batch, 4.5 g l-1 cellobiose	[46]
C. thermocellum DSM 4150	60	1.8	1.7	0.9	0.8	ND	0.1	3.4	Batch, 2 g l-1 glucose	[47]
		0.6	1.8	0.3	1.4	ND	0.2	3.4	Batch, 27 g l-1 cellobiose	[47]
Ta. pseudethanolicus 39E	65	0.1	2.0	0.1	1.8	NR	0.1	3.7	Batch, 8 g l-1 glucose	[50]
		NR	NR	NR	1.6	NR	<0.1	3.2	1 g l-1 xylose	[48]
		NR	NR	0.4	1.0	NR	<0.1	2.0	Batch, 20 g l-1 xylose	[49]
		NR	NR	0.2	0.4	NR	1.1	0.8	Batch, 20 g l-1 glucose	[49]
G. thermoglucosidasius M10EXGD	60	NR	NR	0.6	0.4	1.0	0.9	0.8	Batch, 10 g l-1 glucose	[52]
B cereus ATCC 14579	35	NR	0.1	0.2	0.2	0.3	1.1	0.4	Batch, 3.6 g l-1 glucose	[51]

^A ~ 0.5 mol alanine per mol-hexose produced on cellobiose and maltose.

^BProduces H₂, CO₂, volatile fatty acids, and NH₃ on peptides in the absence of carbon source.

^C ~ 0.5 mol alanine per mol-hexose produced on starch.

^DOnly G. thermoglucosidasuis strain C56-TS93 has been sequenced but no end-product data is available. Strain M10EXG was used for end-product yield comparisons instead.

Abbreviations: NR, not reported; ND, not detected; NA, not applicable; Major, reported as major product without absolute values; ✓, reported as present with no values indicated; Cont, continuous culture; D, dilution rate.