TABLE 2.

Efficiencies of energy generation in D. frappieri TCE1 when different electron donors and acceptors were used^a

Electron donor	Electron acceptor	Product	Growth yield (g of protein/mol of e−)	ΔG°′ (kJ/mol of e−)b	Efficiency (mg of protein/kJ)
Lactate	PCE	cis-DCE	1.83	−87.0	21
	TCE	cis-DCE	2.15	−85.7	25
	Sulfite	Sulfide	1.54	−29.9	51
	Nitrate	Nitrite	1.67	−82.7	20
	Fumarate	Succinate	3.14	−44.2	71
Butyrate	PCE	cis-DCE	2.95	−73.7	40
Formate	PCE	cis-DCE	1.62	−86.4	19
H2	PCE	cis-DCE	1.93	−85.8	23
Ethanol	PCE	cis-DCE	1.54	−83.4	19

^aThe data are data from unique batch experiments. 

^bThe ΔG°′ values were used only to compare the efficiencies of strain TCE1 when different electron donor-electron acceptor combinations were used. Because the conditions in the batches were the same for all of the combinations, these values can be used. These values should not be used to predict growth in natural habitats.