نتایج جستجو برای: nitrate nitrogen content

تعداد نتایج: 546641  

Journal: :international journal of environmental research 0
a. rahman department of civil & environmental engineering, the george washington university, 2121 eye street, nw, washington, dc 20052 r. riffat department of civil & environmental engineering, the george washington university, 2121 eye street, nw, washington, dc 20052 s. okogi dc water, 5000 overlook avenue, sw, washington, dc 20032 i. takacs dynamita sarl, 7 eoupe, 26110, nyons, france a. al-omari dc water, 5000 overlook avenue, sw, washington, dc 20032 s. murthy dc water, 5000 overlook avenue, sw, washington, dc 20032

the stoichiometric parameter namely “yield coefficient” associated with growth of certain organism can be determined by direct measurement and/or calculated indirectly. the focus of this paper was on the anoxic yield of heterotrophic organisms using ethanol as an external carbon source during the denitrification process. in the literature, it was observed that yield coefficients can vary for th...

2018
Walquíria F. Teixeira Evandro B. Fagan Luis H. Soares Jérssica N. Soares Klaus Reichardt Durval D. Neto

The application of amino acids in crops has been a common practice in recent years, although most of the time they are associated with products based on algae extracts or on fermented animal or vegetable wastes. However, little is known about the isolated effect of amino acids on the development of crops. Therefore, the objective of this research was to evaluate the effect of the application of...

Journal: :Rapid communications in mass spectrometry : RCM 2014
John D Howa Michael J Lott James R Ehleringer

RATIONALE Because of the threat of bombings using improvised explosives containing ammonium nitrate (AN), law enforcement and intelligence communities have been interested in stable isotope techniques for tracking and discriminating AN sources. Separate analysis of the AN component ions ammonium and nitrate would add discriminatory power to these techniques. METHODS Ammonium ions in dissolved...

Journal: :Applied and environmental microbiology 2002
Dong Yun Lee Adela Ramos Lee Macomber James P Shapleigh

The taxis response of Rhodobacter sphaeroides 2.4.1 and 2.4.3, Rhodopseudomonas palustris, and Agrobacterium tumefaciens to nitrate and nitrite was evaluated by observing the macroscopic behavior of cells suspended in soft agar and incubated under various conditions. R. sphaeroides 2.4.3, which is capable of both nitrate and nitrite reduction, showed a taxis response to both nitrate and nitrite...

Journal: :Journal of water and health 2007
Aidan A Cronin Steve Pedley Alfred W Hoadley Fatoumata Kouonto Komou Louis Haldin James Gibson Ned Breslin

By 2010 Africa's urban population will have grown to over 420 million with on-site sanitation the predominant excreta disposal option. The use of on-site sanitation has important public health benefits but can result in large faecally derived loadings of nitrogen and chloride to groundwater resources. Nitrate is of particular concern, with elevated concentrations linked to potentially serious h...

Journal: :Journal of experimental botany 2004
A Gallais B Hirel

To study the genetic variability and the genetic basis of nitrogen (N) use efficiency in maize, a set of recombinant inbred lines crossed with a tester was studied at low input (N-) and high input (N+) for grain yield and its components, grain protein content, and post-anthesis nitrogen uptake and remobilization. Other physiological traits, such as nitrate content, nitrate reductase, glutamine ...

Journal: :Journal of plant physiology 2006
Noel Tejera Eduardo Ortega Rosa Rodes Carmen Lluch

Several nitrogen compounds were identified and quantified in the apoplastic and symplastic sap of sugarcane stems. The sap of stems was composed mainly of soluble sugars, which constituted 95% of the total organic compounds detected. Sap also contained nitrogen compounds, with amino acids (50-70% of N) and proteins (20-30% of N), being the main nitrogenous substances, as well as inorganic forms...

2014
Jing Qian Li-Ping Zhang Wen-Yan Wang Qiao Liu

In order to evaluate the effects of different slope lengths (1, 2, 3, 4, and 5 m) and different vegetation coverage ratios (20%, 45%, 60%, and 90%) on the mechanisms of nutrient loss and runoff producing processes, we have conducted 14 simulated rainfall experiments. The results show that N and P loss are decided by the concentration and the runoff volume, but when the amounts of N and P in top...

2014
Lucas Frungillo Michael J. Skelly Gary J. Loake Steven H. Spoel Ione Salgado

Nitrogen assimilation plays a vital role in plant metabolism. Assimilation of nitrate, the primary source of nitrogen in soil, is linked to the generation of the redox signal nitric oxide (NO). An important mechanism by which NO regulates plant development and stress responses is through S-nitrosylation, that is, covalent attachment of NO to cysteine residues to form S-nitrosothiols (SNO). Desp...

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