Table 1.

Overview of thermophilic hydrogen producing microorganisms (continued from Kengen et al. 2009)

Organism	Domain	T opt (°C)	Cultivation	Substrate	Y H2 mmol/mmol C6	References
Thermobrachium celere	Bacteria	67	Batch	Glucose	3.36	(Ciranna et al. 2011)
Clostridium stercorarium DSM 2910	Bacteria	58	Continuous	Lactose	1.57	(Collet et al. 2004)
Thermovorax subterraneus	Bacteria	70	Batch	Glucose	1.4	(Mäkinen et al. 2009)