Hydrogen production and methanogenesis in ruminants: growth kinetics and gas fluxes of key microbial strain
Résumé
In the gastrointestinal tract of ruminants, the microbial fermentation of plant polymers produces volatile fatty acids, CO₂, and H₂. The latter is used by methanogenic archaea to reduce CO₂ into CH₄ a process that occurs through the following equation: 4H₂ + CO₂ → 2H₂O + CH₄. The resulting CH4 is expelled and contributes to greenhouse gas emissions. To address this environmental issue, it is necessary to understand H2 production and transfer during methanogenesis. As a preliminary investigation, the growth kinetics and gas fluxes of Ruminococcus albus, a key ruminal bacterium, and Methanobrevibacter ruminantium, a major methanogen, were evaluated.
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