FIG. 1.

(A) Methane uptake rate constants for M. trichosporium OB3b incubated with 10 ppm of methane and without added salts (solid bar) or with NaCl (open bars; a, 0.5 mM; b, 2 mM; c, 8 mM) or KCl (hatched bars; a, 0.5 mM; b, 2 mM; c, 8 mM). (B) Methane uptake rate constants for M. trichosporium OB3b incubated with 10 ppm of methane and without added salts (solid bar) or with NH₄Cl (open bars; a, 0.5 mM; b, 2 mM; c, 8 mM) or (NH₄)₂SO₄ (hatched bars; a, 0.25 mM; b, 1 mM; c, 4 mM). Data are means of duplicate determinations; the range for duplicates was less than 10% of the mean.