Quantifying the metabolic heat from aerobic methanotrophs.

Methanotrophs dissipate up to 60% of substrate energy as heat, with heat yields surpassing other aerobic microbes, indicating their potential for methane mitigation and energy recovery.

• Why it matters: Understanding the precise heat production of methane-oxidizing bacteria is crucial for developing biotechnologies that leverage their heat dissipation for methane mitigation and energy harvesting, filling a significant knowledge gap.
• What they did: Researchers measured heat flux from pure cultures of Methylomonas methanica S1 and Methylosinus trichosporium OB3b using isothermal calorimetry at various methane concentrations, quantifying biomass-specific heat yields.
• The result: The study found heat yields ranging from 1,473 to 3,728 kJ/C-mol, exceeding previous data for aerobic microbes, establishing a new benchmark for metabolic heat production and enabling innovative applications.