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(A) Separation of 13C-RNA and 12C-RNA by density gradient centrifugation and fractionation. Black bars indicate estimated positions of the 13C-RNA and 12C-RNA fractions. (B) DGGE profiles of RT-PCR-amplified community rRNAs present in fractions 8 to 17 from panel A for day 0 and day 7 samples incubated under denitrifying conditions. (C) Densitometry plots with total band intensities of DGGE profile lanes in panel B.
