FIG. 6.

Number of MR molecules per cell required to generate the corresponding CH₄ production rates per cell (mcrA DNA abundance), calculated using the specific temperature-dependent in vitro activities of M. marburgensis for 4, 15, and 25°C, extrapolated from data reported by Goenrich and colleagues (15) (0.085, 0.28, and 1.6 μmol CH₄ min⁻¹ mg⁻¹, respectively). For 30°C, the MR activity of 25°C was used, as CH₄ production during the temperature trial was highest at 25 and 30°C.