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13C atom% of activated sludge biomass pulsed with [13C]bicarbonate in the presence (triangles) or absence (circles) of ammonium sulfate (A) and with [13C]acetate in the presence (triangles) or absence (circles) of sodium nitrate (B). Arrows show the time points at which the pulses were added to each treatment. The data were gathered from a single reactor per treatment.
