TABLE 3 .

Nitrogenase activity and hydrogen production in the six Cyanothece strains^a

Strain	Nitrogenase activity (C2H4 production [µmol/mg Chl ⋅ h])		Hydrogen production (µmol/mg Chl ⋅ h)
	Aerobic	Anaerobic	Aerobic	Anaerobic
Cyanothece ATCC 51142	148.03 ± 19.06	202.33 ± 23.41	132.04 ± 33.03	308.62 ± 42.01
Cyanothece PCC 7424	40.63 ± 9.53	160.53 ± 28.6	59.64 ± 17.32	201.77 ± 35.6
Cyanothece PCC 7425	0	40.35 ± 10.76	0	54.20 ± 12.04
Cyanothece PCC 7822	52.49 ± 11.07	112.32 ± 18.28	47.83 ± 9.8	133.6 ± 30.13
Cyanothece PCC 8801	101.22 ± 11.65	187.65 ± 43.12	51.64 ± 9.34	186.2 ± 40.23
Cyanothece PCC 8802	98.5 ± 18.12	192.12 ± 36.78	43.87 ± 6.24	176.17 ± 38.78

^aChl, chlorophyll.