TABLE 2.

Generation times of phototrophic cultures^a

Strain	Inoculum	Generation time (h)
R5	Aerobic	4.7 ± 0.3
	Semiaerobic	4.5 ± 0.2
H15	Aerobic	No growth
	Semiaerobic	No growth
H15(pH3.6+)	Aerobic	13.7 ± 0.7
	Semiaerobic	8.1 ± 0.6
H15(pH3.6−)	Aerobic	No growth
	Semiaerobic	24.9 ± 0.8
P5(pE7.7−)	Aerobic	5.7 ± 0.2

^aCorresponding growth curves are shown in Fig. 2.