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• W2034457720 endingPage "1776" @default.
• W2034457720 startingPage "1763" @default.
• W2034457720 abstract "Heterotrophic bacteria can assimilate both dissolved organic nitrogen (DON) and ammonium, but they also can excrete ammonium during DON catabolism. The relationships among DON and ammonium uptake and ammonium excretion are not clear. In the subarctic Pacific, our experiments show that the supply of dissolved free amino acids partially controls whether heterotrophic bacteria assimilate or excrete ammonium. Bacteria in these waters apparently preferred to assimilate amino acids rather than ammonium because addition of amino acids significantly inhibited uptake of ammonium. In <0.8 μm size fractions dominated by heterotrophic bacteria, ammonium uptake occurred only when amino acid concentrations were too low to support bacterial growth. When the amino acid supply was adequate, ammonium was regenerated by bacterial assemblages that had been separated from grazers. The C:N ratio of the amino acid pool, which was the predominate nitrogen source for bacteria during initial phases of our experiments, was 2.6. Based on mass balance consideration, ammonium excretion would be expected if bacterial carbon growth efficiency is assumed to be about 50% and the C:N of bacterial biomass is 4. These results suggest that high rates of amino acid turnover should be positively correlated with high rates of ammonium excretion by heterotrophic bacteria. Thus, amino acid cycling increases availability of ammonium to phytoplankton and may affect plankton community structure and rates of new production." @default.
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• W2034457720 date "1989-11-01" @default.
• W2034457720 modified "2023-10-04" @default.
• W2034457720 title "The effect of amino acids on ammonium utilization and regeneration by heterotrophic bacteria in the subarctic Pacific" @default.
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• W2034457720 doi "https://doi.org/10.1016/0198-0149(89)90071-x" @default.
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