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- W2020803414 abstract "A diverse range of freshwater plankton communities were tested for their ability to take up [14C]methylammonium. Uptake occurred at low substrate levels by high-affinity, energy-requiring, transport systems which were competitively inhibited by ammonium but not by L-amino acids or nicotinamide. A simple competitive inhibition model was used to examine the effects of increasing ammonium levels on uptake in a eutrophic lake. Apparent K1 values for the labelled substrate markedly increased with increasing ammonium. The transport systems had an approximately five-fold greater affinity for ammonium than for methylammonium. The Vmax for methylammonium uptake was relatively insensitive to large changes in ambient ammonium levels. This kinetic parameter may be a useful comparative measure of ammonium transport capacity in natural waters, particularly where low ambient ammonium concentrations preclude the use of 15N." @default.
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- W2020803414 date "1979-12-01" @default.
- W2020803414 modified "2023-10-14" @default.
- W2020803414 title "Uptake of [14C]methylammonium by plankton communities: a comparative assay for ammonium transport systems in natural waters" @default.
- W2020803414 doi "https://doi.org/10.1139/m79-219" @default.
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