TABLE 4.

Relationships and fermentation products of the butyrate-producing strains shown in Fig. 3^a

Strain	Ribotype group	Species identified	% Homologyb	SCFA production (mM)			H2 production (μ mol ml−1)
				Butyrate	Acetate	Lactate
L1-81	1	Unidentified	NA	5.7	−2.0	1.4	5.0
L1-810	1	Unidentified	NA	5.5	41.0	25.5	0.1
L1-952	1	Unidentified	NA	21.3	−10.0	7.1	6.5
L1-93	1	Unidentified	NA	9.8	−10.6	5.7	NDc
L1-83	2	Unidentified	NA	6.5	−2.3	2.1	2.7
L1-92	3a	Unidentified	NA	8.3	−3.9	0.1	12.0
L2-21	3a	Eubacterium rectale	98	3.6	−3.6	ND	ND
L2-50	3b	Unidentified	NA	12.7	11.1	0.97	4.3
A1-86	4	Eubacterium rectale	98	4.7	−2.1	26.5	3.2
A2-183	4	Roseburia cecicola	95	20.0	−8.2	9.7	14.8
T1-815	5	Eubacterium rectale	98	3.3	0.7	18.7	2.6
T1-817	6	Bifidobacterium infantis or longum	98	2.1	7.2	9.2	2.1
L2-6	7	Fusobacterium prauznitzii	98	3.3	−4.8	ND	ND
A2-165	7	Fusobacterium prauznitzii	98	14.4	−7.4	2.9	0
L2-7	8	Eubacterium spp.	97	7.9	−2.2	ND	ND
L2-10	9	Unidentified	NA	4.9	−4.3	ND	ND
L2-12	10	Eubacterium ventriosum	98	4.6	−1.7	ND	ND
A2-166	11	Unidentified	NA	9.7	2.4	ND	ND
A2-207	12	Eubacterium spp.	96	4.6	−2.0	0	1.7
A2-231	13	Unidentified	NA	5.6	5.2	ND	ND
A2-175	14	Unidentified	NA	5.0	−1.8	ND	ND
T2-132	14	Unidentified	NA	2.2	47.6	6.7	0.1
A2-194	15	Unidentified	NA	7.3	−3.5	7.1	0
T2-145	18	Unidentified	NA	2.7	1.0	ND	ND

^aData for SCFA (butyrate and acetate) and for production of lactate and H₂ were from two separate experiments. None of the strains produced propionate, with the possible exception of L1-83 (3 mM). 

^bPercent homology indicates the maximum base sequence identity obtained in database searches. NA, not applicable, indicates no value above 95% identity. 

^cND, not determined.