TABLE 2.

Lactate utilization by human fecal isolates

Strain/closest species	Change in fermentation product concn (mM) on YCFA medium plus 35 mM dl-lactatea					Change in product concn (mM) on YCFA mediumab		Carbon recovery (%)c
	Butyrate	l-Lactate	d-Lactate	Formate	Acetate	Butyrate	Acetate
E. hallii SL6/1/1	21.06 ± 1.06	−15.29 ± 0.10	−14.29 ± 0.51	0.0 ± 0.0	−18.51 ± 0.96	1.42 ± 1.42	−4.96 ± 3.26	90.5
E. hallii SM6/1	25.70 ± 0.43	−12.70 ± 0.50	−18.70 ± 1.06	0.03 ± 0.03	−21.20 ± 2.08	1.42 ± 0.05	−2.61 ± 2.36	98.8
E. hallii L2-7	22.58 ± 0.76	−15.50 ± 0.0	−16.50 ± 0.0	1.09 ± 1.55	−14.77 ± 0.93	0.60 ± 0.03	−1.58 ± 1.73	98.3
A. caccae L1-92	23.35 ± 1.16	−13.66 ± 0.85	−14.91 ± 0.87	−0.05 ± 0.01	−21.98 ± 2.45	1.99 ± 0.09	−2.35 ± 2.03	94.4
A. caccae P2	25.01 ± 1.0	−15.50 ± 1.0	−16.50 ± 1.0	1.03 ± 1.0	−21.19 ± 1.0	1.92 ± 1.00	3.88 ± 1.00	95.4
SS2/1	12.98 ± 0.19	0.57 ± 0.40	−15.49 ± 1.01	0.18 ± 0.02	−12.51 ± 1.27	2.24 ± 0.26	−4.25 ± 4.68	94.7
SSC/2	13.49 ± 0.0	−0.1 ± 0.78	−9.51 ± 6.1	0.36 ± 0.0	−12.12 ± 0.0	2.37 ± 0.09	−0.16 ± 1.32	119.3

^aChange in concentration compared with uninoculated controls during 24 h of incubation at 37°C. Values are means of triplicate cultures from one experiment and are shown ± standard deviation.

^bNo significant change in formate or lactate occurred in basal YCFA medium.

^cCalculated as described in Table 3 footnotes.