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Showing 1 to 20 of 68 for “"Nitrate Reduction"”.
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Abiotic nitrate reduction by redox activated iron-bearing smectites
Nitrate is a contaminant of interest in soils and water. It has been linked to chronic human illness and a variety of environmental problems, including hypoxia in coastal waters. Previous work has shown that nitrate is naturally removed from soils below the redox interface of the soil profile. A …
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Electrocatalytic Oxygen and Nitrate Reduction Reactions Using Cu-Based Electrodes
… of this dissertation is on the electrocatalytic reduction of oxygen (O 2 ) and nitrate (NO 3 -) to water (H 2 O) and ammonia (NH 3 ), respectively, using molecular- and surface-based Cu electrocatalysts. The oxygen reduction reaction (ORR) is important due to its application in the cathode of …
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Exploring saturated drainageways for nitrate reduction in tile-drained agricultural lands
… of a saturated grassed waterway as a nitrate (NO₃⁻N) reduction practice in agricultural landscapes. Conducted in a 130-ha field in Black Hawk County, Iowa, the research monitored flow and NO₃⁻N concentration to quantify mass loss within the drainageway. The study site featured a …
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Generation of Reduced Nicotinamide Adenine Dinucleotide for Nitrate Reduction in Green Leaves
Made available in DSpace on 2014-12-10T17:12:47Z (GMT). No. of bitstreams: 1 7013381.pdf: 3547242 bytes, checksum: 7069da0393d6fdbdc2ffe93673d55ccb (MD5) Previous issue date: 1969
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Palladium-Copper-Polyvinylpyrrolidone Colloids: Catalysts and Catalyst Precursors for Nitrate Reduction and Related Reactions
Pd/PVP catalyzed H-D exchange in substituted pyridines and other nitrogen containing heterocyclic compounds was followed using 1H-NMR spectroscopy. Substitution at the position alpha to the endocyclic nitrogen was favored for the majority of compounds studied.
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Elucidation of nitrate reduction mechanisms on a Pd/In bimetallic catalyst using isotope labeled nitrogen species
… emerged as an effective treatment approach for nitrate (NO3-) removal, but its full-scale application for direct treatment of drinking water or ion exchange regenerant brines requires improved selectivity for the end-product dinitrogen (N2) over toxic ammonia species (NH4+, NH3). A key to …
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Denitrification, Dissimilatory Nitrate Reduction, and Methanogenesis in the Gut of Earthworms (Oligochaeta): Assessment of Greenhouse Gases and Genetic Markers
… for denitrifiers, and dissimilatory nitrate reducers (DNR). Thus, substrate-derived denitrifiers in the earthworm gut (Lumbricidae) emit the greenhouse gas N2O as well as N2. One large species (Megascolecidae) emitted no N2O, leading to the hypothesis that large earthworms cannot emit …
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Mechanistic Study of Fouling and Regeneration of Palladium-Based Bimetallic Catalysts Used for the Removal of Pollutants From Drinking Water
Nitrate is one of the world's most widespread pollutants in both surface and groundwater and is caused by the over application of fertilizers and leaking septic tanks. The consumption of drinking water containing high levels of nitrate has been directly linked to adverse health effects in humans. …
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Tropical stony corals host diverse microbial nitrogen dynamics
… experiments to produce the first measurements of nitrate reduction, nitrite oxidation, and nitrous oxide (N2O) production in five species of reef-building corals in the Gardens of the Queen, Cuba. Nitrate reduction and nitrite oxidation are present in most species sampled, but ammonium oxidation …
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Electrochemical NOx reduction using a carbon nanospiked catalyst
Electrochemical NOx reduction was studied using a novel, nanostructured nitrogen-doped carbon nanospikes catalyst (CNS). NOx is a major environment and health concern that is typically eliminated using noble-metal gas-phase catalytic reactors. Alternatively, an electrocatalytic approach may reduce …
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Normoxic and anoxic metabolism of Nicotiana tabacum transformants lacking root nitrate reductase
… aim of this work was to find out whether and how nitrate reduction in roots would facilitate survival of hypoxic and anoxic (flooding)-phases. For that purpose, we compared the response of roots of hydroponically grown tobacco wildtype (Nicotiana tabacum cv. Gatersleben) and of a transformant …
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Application of multi-state financial data for use with the USDA Agricultural Conservation Planning Framework
… to be used with the ACPF to quantify costs and nitrate reduction outcomes associated with best management practices (BMPs) and conservation scenarios in agriculturally dominated watersheds across the US Corn Belt. The ACPF is a GIS-based conservation planning tool that uses high-resolution …
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Metallic and bimetallic catalysts for electrochemical reduction of problematic aqueous anions
… as possible catalysts for the electrochemical reduction of nitrate. Iindium and palladium are the most thoroughly examined metals in this work, but nickel, tin, platinum, thallium, lead, and gallium are also incorporated into the systems investigated. Indium metal is found to perform an …
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Effect of passive and active heating on the performance of denitrifying bioreactors
… is a management practice developed to reduce nitrate pollution from agricultural fields with subsurface drainage. Denitrifying bioreactors are woodchip filled trenches that provide the necessary energy source to allow for microbial communities to convert harmful nitrate (NO3-) into atmospheric …
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Microbial fuel cells coupled with open pond for wastewater treatment: is it viable?
… and operational modes for organic removal, nitrate reduction, and energy recovery. When treating an artificial secondary effluent for nitrate removal, the SMFC could remove 44% of the nitrate, higher than that without electricity generation. The enhanced removal was attributed to the supply …
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Investigation of the Surface-Electrolyte Interface of Semiconductors and Metals
… third project details the origin of differential nitrate reduction activity between the (100), (111), and (110) faces of Cu using vibrational spectroscopy and calculations. Shell isolated nanoparticle enhanced Raman spectroscopy (SHINERS) reveals a suite of intermediates from the nitrate reduction …
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Mechanisms of Microbial Methane Production from Sub-Bituminous Australian Coal
… presence of a number of genes in the benzoyl-CoA reduction pathway, which is central to many anaerobic aromatic hydrocarbon degradation processes. Metagenomic analysis of microbial communities in the field trial revealed a number of relevant pathways for the biogasification of coal, including …
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The effects of atrazine on nitrogen cycling in a freshwater wetland microcosm
… reference to the microcosm. Nitrite, nitrate, and ammonia levels were determined, as was dissolved oxygen, pH, and conductivity. The nitrifying bacteria and denitrifying bacteria were enumerated. Data were analyzed with one way analysis of variance (ANOVA) with block and treatment …
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The Effects of Water Quality Policies Under Alternative Representations of Farmer Behavior
Results from this analysis suggest that nitrate reduction standards will not necessarily be achieved across producer types with policies designed for profit-maximizing producers. Thus, producers with other motives must be considered in the formulation of pollution policies. Further, those policies …
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Tropical stony corals host diverse microbial nitrogen dynamics
… experiments to produce the first measurements of nitrate reduction, nitrite oxidation, and nitrous oxide (N₂O) production in five species of reef-building corals in the Gardens of the Queen, Cuba.
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