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Oxidation and incorporation of 13C-CH4 during repeat batch incubations with riverbed gravel. (a) Rapid initial rates of methane oxidation following each sequential enrichment of the headspace with 13C-CH4. (b) Resulting enrichment of the lipid (crude extract) and bulk organic components of the gravels over the entire 409 h incubation. Mean±s.e., n=4 for all.
