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T-RFLP fingerprints of density-resolved bacterial communities. Profiles were generated from representative “light” and “heavy” rRNA gradient fractions of the labeled (13C) and unlabeled (12C) soil incubations as specified. CsTFA BDs (g ml−1) of fractions are given in brackets. T-RFs in “heavy” rRNA (after 1 week) characteristic for “heavy” fractions are specified, along with their respective fragment lengths, and were subsequently identified by cloning and sequencing.
