Acetogenesis
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The short chain-fatty acids, other than acetate, that are produced in the Acidogenesis step are further converted to acetate, hydrogen gas and carbon dioxide by the acetogenic bacteria. β-oxidation is the mechanism of anaerobic oxidation of long chain fatty acids with as products hydrogen and acetate. The available H2 and CO2 is partly converted into acetate by the homoacetogenic bacteria. Both propionate and butyrate are important intermediates in anaerobic digestion, and then are converted by the hydrogen producing acetogenic bacteria into acetate and hydrogen
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