Figure F3. Schematic view of coal-to-methane biodegradation based on observation from a subsurface coalbed in the Illinois Basin. The degradation sequence from complex macromolecules to low molecular–weight substrates and finally methane is proposed to be carried out by microbes that have either been isolated or detected by a genetic survey (numbers associated with processes). Reproduced from Strapoc et al. (2008).
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