Table 2.

H₂ production rates of various carboxydotrophic hydrogenogenic microbes

Organism	Cultivation method	H2 production rate (mmol liter−1 h−1)a	Specific H2 production rate (mmol g−1 h−1)a	Reference
T. onnurineus NA1 (MC01)	Batch	123.5b	194.7b	This study
T. onnurineus NA1 (wild type)	Batch	32.9b	151.3b	This study
Rhodopseudomonas palustris P4	Batch	41	41	29
Citrobacter sp. strain Y19	Batch	5.7	27.1	30
Rhodospirillum rubrum	Continuous	4.7	11	31
Rubrivivax gelatinosus CBS-2	Continuous	2.7	1.3–33	32

^aKinetic parameters were calculated with data from graphs in Fig. S5 in the supplemental material. The unit gram represents dry cell weight.

^bThe values were calculated from data obtained in a bioreactor where 100% CO was continuously fed with a flow rate of 240 ml min⁻¹ (MC01 strain) and 400 ml min⁻¹ (wild-type strain).