Table 1. Gibbs energies, enthalpies and entropies of metabolic processes involving some methanogens growing on different energy sources.

Microorganism	Energy substrate	Growth conditions	ΔGm kJ / C-mol	ΔHm kJ / C-mol	TΔSm kJ / K-1 C-mol	Driving force	Reference
M. ruminantium, M. smithii,	H2/CO2	anaerobic	-1073	-2132	-1059	Enthalpy-driven but Entropy-retarded	this work
M. formicium	H2/CO2	anaerobic	-801	-1605	-804	Enthalpy-driven but Entropy-retarded	this work
M. thermo-autotrophicum	H2/CO2	anaerobic	-802	-3730	-2928	Enthalpy-driven but Entropy-retarded	[50]
M. formicium	formate	anaerobic	-880	-613	+267	Enthalpy-driven	[23]
M. barkeri	methanol	anaerobic	-570	-420	+150	Enthalpy-driven	[23]
M. barkeri	acetate	anaerobic	-366	+145	+511	Entropy-driven but enthalpy-retarded	[51]