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305 results for “nitrogen”
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Research ArticleOpen accessIn the abstractAssessing the Effect of a Dumpsite to Groundwater Quality in Payatas, PhilippinesGlenn L. Sia SuThe study assessed and compared the groundwater quality of 14 selected wells continuously used in the with (Payatas) and without dumpsite (Holy Spirit) areas at the Payatas estate, Philippines. Water quality monitoring and analyses of the bio-physico-chemical variables (pH, Total Suspended Solids (TSS), Total Dissolved Solids (TDS), total coliform, conductivity, salinity, nitrate-nitrogen, sulfate, color, total chromium, total lead and total … …American Journal of Environmental Sciences, Vol. 4, Issue 4 · 31 Aug 2008 · 9,466 accessesView PDFCite
Research ArticleOpen accessIn the abstractCharacterization of Maturity Level in Laying Hen Manure by Chemical and Thermogravimetric AnalysisAlice Dall’Ara, Francesco Antolini, Laura Billi et al.This study aims at investigating maturity levels in manure from laying hens in order to encourage its agronomic re-utilization. In fact the use of unstable/insufficiently mature manure could potentially damage both soils and crops. Effective, easy to reproduce methods are needed in order to assess bio-stabilisation and maturity levels, particularly for biomass that has not undergone conventional composting. This study … …American Journal of Environmental Sciences, Vol. 4, Issue 4 · 31 Aug 2008 · 6,540 accessesView PDFCite
Research ArticleOpen accessIn the abstractEffect of Processing on the Electrical Properties of Spray-Deposited SnO2:F Thin FilmsShadia J. Ikhmayies, Riyad N. Ahmad-BitarHighly transparent SnO2:F thin films were produced by the Spray Pyrolysis (SP) technique to be used as forcontacts in the home made CdS/CdTe solar cells. Films of thickness 100-200 nm were prepared at substrate temperatures in the range 380-480°C. To improve the electrical properties of the films, annealing in nitrogen atmosphere at 400°C and etching by HNO3 were tried. The … …American Journal of Applied Sciences, Vol. 5, Issue 6 · 30 Jun 2008 · 7,002 accessesView PDFCite
Research ArticleOpen accessIn the abstractWater Quality Assessment of A Constructed Wetland Treating Landfill Leachate and Industrial Park RunoffC. Galbrand, I. G. Lemieux, A. E. Ghaly et al.A surface flow constructed wetland was used for the treatment of landfill leachate and industrial park runoff. The wetland consisted of seven cells and was designed as a kidney shape to facilitate high retention time. The water quality was assessed for iron, manganese, phosphorus (orthophosphate), pH, dissolved oxygen (DO), nitrogen (ammonia, nitrate, nitrite and TKN), chemical oxygen demand (COD), total … …American Journal of Environmental Sciences, Vol. 4, Issue 2 · 30 Apr 2008 · 7,368 accessesView PDFCite
Research ArticleOpen accessIn the abstractHormesis and Exercise: How the Cell Copes with Oxidative StressLi Li Ji, Zsolt Radak, Sataro GotoContraction-induced production of reactive oxygen and nitrogen species has been shown to cause oxidative stress to skeletal muscle, heart and other organs. As an adaptive response, muscle antioxidant defense systems are upregulated in response to exercise to restore intracellular prooxidantantioxidant homeostasis. Thus, both young and old animals and humans involved in regular exercise have shown reduced oxidative damage during acute … …American Journal of Pharmacology and Toxicology, Vol. 3, Issue 1 · 31 Mar 2008 · 7,817 accessesView PDFCite
Research ArticleOpen accessIn the abstractOptimal Production Planning of Electricity from Coal-Fired Power Plant Networks under Environmental ConsiderationsHabib H. Al-Ali, Yousef Saif, Ali Elkamel, Ali LohiIn this study, electricity production from a network of coal power plants and under environmental constraints is considered. Several pollutants are incorporated into the decision planning process including nitrogen oxides (NOx), sulfur oxides (SOx) and mercury (Hg). A Nonconvex Mixed Integer Nonlinear Programming (MINLP) model was first developed to assist in the evaluation process. An exact linearization of the nonconvex … …American Journal of Engineering and Applied Sciences, Vol. 1, Issue 4 · 31 Mar 2008 · 7,070 accessesView PDFCite
Research ArticleOpen accessIn the abstractAssessment of Constructed Wetland Biological Integrity Using Aquatic MacroinvertebratesC. Galbrand, I. G. Lemieux, Abdel E. Ghaly et al.A surface flow constructed wetland consisting of seven cells was used to treat the leachates from a decommissioned landfill. Wetland monitoring was performed by evaluating the treatment efficiency of the landfill leachate and the wetland biological integrity of the wetland. The water quality samples were analyzed for iron, manganese, phosphorus (orthophosphate), pH, dissolved oxygen (DO), nitrogen (ammonia, nitrate, nitrite and … …OnLine Journal of Biological Sciences, Vol. 7, Issue 2 · 31 Dec 2007 · 7,415 accessesView PDFCite
Research ArticleOpen accessIn the abstractAssessment of Soil Solution Chemicals after Tannery Effluents DisposalCélia A. Surita, Thomas Gloaguen, Célia R. Montes, Carlos T.S. DiasKnowledge about soil solution chemicals is important for assessing their mobility, availability, migration to groundwater and toxicity to plants. The objective of this study was to apply factor analysis to data obtained on soil solution chemicals during a one-year monitoring program in a controlled experiment with tannery effluents disposed on the soil surface, to extract information on their relationship and … …American Journal of Applied Sciences, Vol. 4, Issue 12 · 31 Dec 2007 · 6,772 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Proteolytic System of Candida dubliniensisLoaiza-Loeza Salomé, Parra-Ortega Berenice, Bautista-Muñoz Consuelo et al.Proteases of Candida dubliniensis have been scarcely studied, these enzymes may play an important role in nitrogen metabolism, post-translational processing, nutritional stress, dimorphism, virulence, etc. In this work, we report the presence of five different intracellular proteases and one extracellular proteolytic activity. The intracellular proteases are: aminopeptidase ycdAPE, carboxypeptidase ycdCP, dipeptidyl aminopeptidase ycdDAP, proteinases ycdPrA and ycdPrB, and extracellular protease … …American Journal of Infectious Diseases, Vol. 3, Issue 2 · 30 Jun 2007 · 6,953 accessesView PDFCite
Research ArticleOpen accessIn the abstractDeep Defects Annihilation in GaAs1-xNx Layers by Si-dopingN. Ben Sedrine, A. Hamdouni, J. Rihani et al.The photoluminescence (PL) properties of Si-doped GaAs0.985N0.015 with different silicon content were investigated. The study was carried out on a set of three samples grown by Molecular Beam Epitaxy (MBE) on GaAs (001) oriented substrate using a radio frequency nitrogen beam source. For all samples, the PL measurements show the presence of a wide band situated at 0.83 eV which … …American Journal of Applied Sciences, Vol. 4, Issue 1 · 30 Apr 2007 · 8,160 accessesView PDFCite