کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6386191 | 1626924 | 2015 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Uptake and inhibition kinetics of nitrogen in Microcystis aeruginosa: Results from cultures and field assemblages collected in the San Francisco Bay Delta, CA
ترجمه فارسی عنوان
کینتیک جذب و مهار نیتروژن در میکروسیستی آئروژینوزا: نتایج حاصل از کشت و جمع آوری فیلد جمع آوری شده در دلتای خلیج سن فرانسیسکو، کالیفرنیا
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
چکیده انگلیسی
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 (NO3â), urea and glutamic acid over short-term incubations (0.5-1 h), and to study inhibition of NO3â, NH4+ and urea uptake by NH4+, NO3â 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 Lâ1. 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 NO3â. 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 NO3â uptake by NH4+ or inhibition of NH4+ uptake on NO3â, but both strains showed some inhibition of urea uptake by NH4+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Harmful Algae - Volume 47, July 2015, Pages 126-140
Journal: Harmful Algae - Volume 47, July 2015, Pages 126-140
نویسندگان
Jamie Lee, Alexander E. Parker, Frances P. Wilkerson, Richard C. Dugdale,