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Increasing buoyant density of the dominant band in 16S rRNA community profiles throughout the duration of the phenol-13C6 pulse. (A) The intensity of the dominant DGGE band remains constant in fraction 10 over time. (B) The intensity of the dominant DGGE band increases in fraction 6 over time, confirming an increase in the buoyant density of RNA from this species as phenol-13C6 is consumed.
