Table 1.

Steady state biomass productivity of Methylacidiphilum sp. RTK17.1 during growth on methane (CH₄), methanol (CH₃OH), and formic acid (CHOOH)^∗.

Biomass	CH4a	CH4b	CH3OHc	CHOOHd
Biomass productivity (mg L−1 h−1)	5.57 (±0.50)	5.40 (±0.26)	13.18 (±0.70)	4.73 (±0.45)
YCDW/substrate (g mol−1)	6.29 (±0.25)	6.79 (±0.55)	7.83 (±0.41)	2.86 (±0.27)
YCDW/e− (g mol−1)	0.78 (±0.03)	0.85 (±0.07)	1.31 (0.07)	1.43 (±0.14)

^∗The standard deviation of minimum triplicate measurements is provided in brackets.

^aMethylacidiphilum sp. RTK17.1 grown continuously on V4 mineral medium (50°C, pH 2.5) at 10 ml min⁻¹ 14.1% O₂, 0.4% H₂, 3.2% CH₄, 26% CO₂, with the balance N₂ (v/v). A constant dilution rate (D = 0.02 h⁻¹) was maintained, with NH₄⁺ supplied at an influent concentration of 0.4 g L⁻¹ (Carere et al., 2019).

^bMethylacidiphilum sp. RTK17.1 grown continuously on V4 mineral media (50°C, pH 2.5) at 10 ml min⁻¹ 3.5% O₂, 3% CH₄, 26% CO₂, balance N₂ (v/v). A dilution rate of 0.02 h⁻¹ was maintained (Carere et al., 2017).

^cMethylacidiphilum sp. RTK17.1 grown continuously on V4 mineral medium supplemented with 12.4 mM CH₃OH, 45°C, pH 2.5, D = 0.0052 h⁻¹ in a 2% CO₂, 2% O₂, balance N₂ (v/v) headspace (This study).

^dMethylacidiphilum sp. RTK17.1 grown continuously on V4 mineral medium supplemented with 12.4 mM CHOOH, 45°C, pH 2.5, D = 0.0052 h⁻¹ in a 2% CO₂, 2% O₂, balance N₂ (v/v) headspace (This study).