Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 418 for “"NO3⁻"”.
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Fundamental Studies of Reactions between NO3 Radicals and Organic Surfaces
… hydrogen abstraction was observed during NO3 exposure. The results presented in this thesis should help develop an understanding of the fundamental interfacial reaction dynamics of NO₃ radicals with organic surfaces.
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Hydrogen Abstraction by the Nighttime Atmospheric Detergent NO3·: Fundamental Principles
The nitrate radical (NO3·) was first identified as early as the 1881, but its role in atmospheric oxidation has only been identified within recent decades. Due to its high one-electron reduction potential and its reactivity toward a diverse set of substrates, it dominates nighttime atmospheric …
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Thermodynamic properties of Ni[(CH3)3P]3X^2 (X=Cl, Br, I, SCN, NO3) complexes
Electronic Thesis or Dissertation
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Regulation of nitrate uptake and calcium signaling in arabidopsis
… by plants, and its most abundant form, nitrate (NO3-), has been extensively used in fertilizers to improve crop yield. However, this has also led to increased environmental pollution due to leaching and volatilization. Improving nitrogen use efficiency (NUE) is one of the ways to reduce this …
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Salivary Reduction of Dietary Nitrate
… mostly for its vasodilatative effects. Nitrate (NO3-) acts as an important NO source through reductive physiological pathways. Basal plasma NO3- levels are a sum of the oxidation of endogenous NO and ingested dietary NO3-. Approximately 25% of dietary NO3- is recovered by the salivary glands and …
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Identifying nitrate transport mechanisms and export dynamics using water age modeling and concentration-discharge relationships
… U.S. are a significant source of nitrate (NO3-) loss to surface waters. Water flow paths and residence times determine the contact length between NO3- and sub-surface material, controlling the rate of biogeochemical reactions and nitrogen removal via denitrification. A Nitratax N- NO3- …
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Untersuchungen zur Dynamik des Nährstofftransports im Xylem von Pappeln unter besonderer Berücksichtigung der Stickstoffversorgung des Sprosses
… in Abhängigkeit von endogenen Faktoren ((a) NO3--Bedarf entlang der Sproßachse, (b) diurnal bedingte Variationen) als auch in Abhängigkeit von exogenen Faktoren ((c) Änderungen im N- und K+-Angebot) untersucht. Die Nährstofftranslokation im Xylem wurde dabei mit einer hohen zeitlichen …
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Nitrate und Disulfate ausgewählter Haupt- und Nebengruppenmetalle : Synthese, Struktur und thermisches Verhalten
… wurden Nitrosylium-Nitrate wie z. B. (NO)2[Ga(NO3)5] und (NO)5(Bi(NO3)4)4(NO3)•HNO3 erhalten. Das Bismut-Nitrat zeigt eine ungewöhnliche Kettenstruktur. Reaktionen mit rauch. HNO3 führten zu den Verbindungen (NO)3(SE2(NO3)9) (SE = La Nd, Sm Gd), (NO)[SE2(NO3)7(H2O)4] (SE = Tb Ho), …
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Evaluation and prediction of hydrology and nitrate-nitrogen transport in tile-drained watersheds
… and increased transport of nitrate-nitrogen (NO3-N) to surface water. The direct link between subsurface tile drainage and transport of nonpoint-source pollutants, particularly NO3-N, to surface waters is a primary concern for downstream drinking water supplies and hypoxia in the Gulf of …
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The Chemodenitrification of Nitrate by Green Rust and Mackinawite and its Geochemical Implications
… in this thesis, aspects around abiotic nitrate (NO3-) reduction under environmentally relevant conditions has been undertaken to shed further insight into NO3- chemodenitrification driven by Fe(II)/Fe(III)-bearing minerals. The kinetics of NO3- chemodenitrification in Fe(II)/Fe(III) …
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Nitrogen spiraling in stream ecosystems spanning a gradient of chronic nitrogen loading
… of N. In order to identify controls on NO3-N spiraling in anthropogenically impacted streams, I examined relationships among NO3-N spiraling and a suite of chemical, physical, and biological variables in streams spanning a gradient of N concentration. Across all streams, gross primary …
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Soil nitrogen, active carbon, corn, and small grain response to manure injection
… under corn silage. This study found that soil NO3-N was the same under injection and broadcasting but did alter the spatial distribution of soil NO3-N as it was consistently elevated in the injection band compared to between bands. No differences in active carbon were observed, even when …
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Nitrate Sorption in the Soils of the Coweeta Hydrologic Laboratory
… and water quality. Understanding how nitrate (NO3-) moves through the soil system and if it has the potential to be retarded from vertical or lateral leaching allows for a better understanding of the processes important for NO3- movement and export from forested watersheds. We examined four …
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Cumulative Impacts of Watershed-Scale Hyporheic Stream Restoration on Nitrate Loading to Downstream Waterbodies
… that receives dissolved nitrate-nitrogen (NO3--N) mitigation credit under the Chesapeake Bay TMDL. We populated the model with hyporheic exchange (0.3% of surface flow per hyporheic-exchange inducing in-stream restoration structure) and NO3--N removal (supply-limited denitrification removes …
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Influence of surface chemistry of carbon materials on inorganic nitrogen contaminants chemisorption
… (INC), namely ammonium (NH4 +), nitrate (NO3-), and nitrite (NO2-), using carbon materials (CMs) such as activated carbon (AC), and biochar (BC) has been widely implemented. This study was based on the hypothesis that surface chemical properties of CMs significantly influence INC …
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Ultrahigh Vacuum Studies of the Reaction Kinetics and Mechanisms of Nitrate Radical with Model Organic Surfaces
… and formation while a well-characterized flux of NO3 impinges on the organic surface. Overall, the reaction kinetics and mechanisms were found to depend on the terminal functional group of the SAM and incident energy of the nitrate radical (NO3). For reactions of the H2C=CH-SAM with NO3, the …
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Impact of Biochar Amendment, Hydraulic Retention Time, and Influent Concentration on N and P Removal in Horizontal Flow-Through Bioreactors
… capability to stimulate simultaneous nitrate (NO3--N) and phosphate (PO43--P) removal in DNBRs. This study investigated biochar's potential as an amendment to the traditional woodchip media by conducting nine, five-day trials on twelve laboratory-scale, horizontal flow-through DNBR columns. …
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Zersetzungsverhalten neuartiger, kohlenstofffreier Gold-Precursoren für den Einsatz in elektronenstrahlgestützten additiven Strukturierungsverfahren zur direkten Abscheidung von Metallen
… Tetranitratoaurat-Precursoren NH4[Au(NO3)4], NO[Au(NO3)4] und NO2[Au(NO3)4] auf Siliziumoberflächen für den Einsatz in additiven Abscheideverfahren zur Erzeugung kohlenstofffreier nanoskaliger Goldstukturen untersucht. Ein grundlegender Teil dieser Arbeit bestand in der Klärung der …
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Long term nitrate removal in a denitrification wall
… new ways to remove N (in the form of nitrate (NO3-)) from groundwater, primarily through enhancing microbial denitrification. One technology utilizing this microbial process is a denitrification wall, which is an inexpensive, low-maintenance technology compared to other options to treat …
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Denitrification and greenhouse gas emissions from cultivated and wetland alluvial soils
… Basin has contributed to an 3-fold increase in NO3 loading of the river. Increased NO3 loading is a primary cause of eutrophication in the northern Gulf of Mexico. Identification of best management practices (BMPs) to reduce NO3 loss and wetlands restoration to remove NO3 through denitrification …
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