Table 2.

Culture profiles of Clostridium sp. AWRP in the PETC medium with various gas/liquid ratios

Parameters	Gas-to-liquid ratio (relative)
	3.0 (1)	6.9 (2.34)	14.8 (5.02)
Gasa (mM)
CO consumed	157 ± 1	368 ± 2	778 ± 7
H2 consumed	29 ± 2	15 ± 5	7 ± 3
CO2 produced	52 ± 2	186 ± 11	434 ± 3
Metabolite (mM)
Acetate	28 ± 2	40 ± 4	14 ± 2
Ethanol	8 ± 1	24 ± 2	94 ± 0
2,3-Butanediol	NDb	2 ± 0	6 ± 1
C-recoveryc (%)	79 ± 1	87 ± 2	87 ± 0

^aNormalized to the culture volume by: Δ(Headspace gas concentration) × (headspace volume)/(culture volume)

^bNot detected

^cCarbon recovery; cell mass was not included