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- W780506889 abstract "The nitrogen (N) uptake kinetic parameters for Microcystis field assemblages collected from the San Francisco Bay Delta (Delta) in 2012 and non-toxic and toxic laboratory culture strains of M. aeruginosa were assessed. The 15N tracer technique was used to investigate uptake of ammonium (NH4+), nitrate (NO3−), urea and glutamic acid over short-term incubations (0.5–1 h), and to study inhibition of NO3−, NH4+ and urea uptake by NH4+, NO3− and NH4+, respectively. This study demonstrates that Delta Microcystis can utilize different forms of inorganic and organic N, with the greatest capacity for NH4+ uptake and the least for glutamic acid uptake, although N uptake did not always follow the classic Michaelis–Menten hyperbolic relationship at substrate concentrations up to 67 μmol N L−1. Current ambient N concentrations in the Delta may be at sub-saturating levels for N uptake, indicating that if N loading (especially NH4+) were to increase, Delta Microcystis assemblages have the potential for increased N uptake rates. Delta Microcystis had the highest specific affinity, α, for NH4+ and the lowest for NO3−. In culture, N uptake by non-toxic and toxic M. aeruginosa strains was much higher than from the field, but followed similar N utilization trends to those in the field. Neither strain showed severe inhibition of NO3− uptake by NH4+ or inhibition of NH4+ uptake on NO3−, but both strains showed some inhibition of urea uptake by NH4+." @default.
- W780506889 created "2016-06-24" @default.
- W780506889 creator A5009559917 @default.
- W780506889 creator A5025894394 @default.
- W780506889 creator A5064188009 @default.
- W780506889 creator A5076377983 @default.
- W780506889 date "2015-07-01" @default.
- W780506889 modified "2023-10-18" @default.
- W780506889 title "Uptake and inhibition kinetics of nitrogen in Microcystis aeruginosa : Results from cultures and field assemblages collected in the San Francisco Bay Delta, CA" @default.
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- W780506889 doi "https://doi.org/10.1016/j.hal.2015.06.002" @default.
- W780506889 hasPublicationYear "2015" @default.
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