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- W2076093811 abstract "The kinetics of N (nitrate, ammonium and urea) uptake by the eucaryotic picoflagellate Micromonas pusilla (Butcher) Manton et Parke were investigated using N-replete batch cultures and the 15N tracer technique. Maximum specific uptake rate (Vmax) of NH4+ was 0.13·h−1, > 2 times the Vmax of NO3− or urea (≈ 0.05·h−1). The half-saturation constants (Ks) for urea, NH4+ and NO3− were similar with an average value of 0.4 μg-at N·1−1 which is within the range reported for small oceanic diatoms. The greater initial slope of the Michaelis-Menten plot for NH4+ uptake suggests that M. pusilla can utilize low concentrations of NH4+ more effectively than equivalent concentrations of urea or NO3−. The results of this first study of N uptake kinetics by an eucaryotic picoplankter demonstrate the preference for NH4+ over urea and NO3− as a nitrogenous nutrient source, which may contribute to the relative success of picoplankton in oligotrophic oceanic regions." @default.
- W2076093811 created "2016-06-24" @default.
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- W2076093811 date "1991-11-01" @default.
- W2076093811 modified "2023-10-16" @default.
- W2076093811 title "Kinetics of nitrogen (nitrate, ammonium and urea) uptake by the picoflagellate Micromonas pusilla (Prasinophyceae)" @default.
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- W2076093811 doi "https://doi.org/10.1016/0022-0981(91)90220-q" @default.
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