‘The association between anaerobic heterotrichous ciliates and endosymbiotic methanogenic archaea depends on the presence of hydrogenosomes that provide intracellular hydrogen as a substrate for methane formation.’
‘Until recently, the distribution of these functions has been limited to methanogenic archaea and methylotrophic proteobacteria, and their evolutionary history remained obscure.’
‘Sulfate-reducing bacteria directly compete with methanogenic bacteria for vital substrates, such as hydrogen and acetate.’
‘Continued metabolism of residual organic matter by methanogenic bacteria results in the production of biogenic methane which, under favourable circumstances, can accumulate in commercial quantities.’
‘It is easy to speculate that methanogenic bacteria living beneath the surface of Mars could be the active source.’
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