TABLE 1.

Conditions for optimal growth of the three mesophilic verrucomicrobial methanotroph strains as tested in batch cultures^a

Strain	Optimum temp (°C) (maximum temp)	μmax (h−1) (doubling time [h])	Optimum pH range	Lowest pH (% of μmax)
3B	44 (49)	0.042 (16)	1.5–3	0.6 (30)
4AC	38 (43)	0.035 (20)	1–3	0.5 (40)
3C	35 (39)	0.013 (53)	1.5–3	0.6 (35)

^aBecause of the oxygen sensitivity of strain 4AC, this organism was grown at 5% O₂ compared to 17% O₂ for the other two strains. μ_max = ln2/doubling time.