TABLE 1.

Aerobic growth of A. ferrooxidans upon oxidation of H₂ by O₂

Strain	Mean cell density (107 cells/ml) ± SDa
	Initial	Final
ATCC 23270	0.79 ± 0.05	1.14 ± 0.38
JCM 3863	0.70 ± 0.32	0.75 ± 0.40
JCM 3865	1.06 ± 0.05	2.77 ± 0.83
JCM 7811	0.76 ± 0.27	3.20 ± 1.60
IFO 14246	0.85 ± 0.05	3.98 ± 0.96
IFO 14262	0.89 ± 0.04	15.91 ± 3.60

^aInitial and final indicate cultivation times before and after 17 days of incubation, respectively. Values are expressed as the average of three cultures.