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 27 for “"nitroaromatic"”.
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Investigation of temperature effects on subsurface attenuation of nitroaromatic compounds
Inadvertent releases of nitroaromatic compounds (NACs) during the production of dyes, explosives, and pesticides have led to soil and groundwater contamination at a chemical production facility in New Jersey. Elevated carbon dioxide fluxes and depleted ¹⁴C content were observed in the contaminated …
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Nitroaromatic pro-drug activation and resistance in the African trypanosome
… the re-emergence of yet another epidemic. Nitroaromatic compounds, such as nifurtimox (in combination with eflornithine) and fexinidazole (in clinical trials), have been recently introduced for the treatment of the second stage of sleeping sickness. These compounds are believed to act as …
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Characterization and reconstitution of enzymes and pathways in the biosynthetic production of nitroaromatic compounds
… syringae was identified as possibly making a nitroaromatic product. Isolation and identification of this cluster’s gene product was attempted based on heterologous expression of the cluster in E.coli, and fermentation studies in the native host. To that end, the gene cluster was recloned in a …
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The treatability of a munitions-manufacturing waste with activated carbon
… Test parameters included the removal of nitroaromatic compounds and color. Results show that treatment of the TNT manufacturing waste from Radford Army Ammunition Plant, Radford, Virginia, with activated carbon is technically feasible. Essentially complete removal of color and …
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Separating the Kinetic and Sorption Parameters of Mixed Chlorinated Solvents in Contact with Granular Iron
Chlorinated solvents and nitroaromatic solvents in drinking-water supplies are an important concern for public health. Granular iron, the most common medium in permeable reactive barriers (PRBs), is very effective at removing organic chemicals, such as chlorinated solvents and nitroaromatic …
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Supramolecular assemblies of conjugated sensory polymers and the optimization of transport properties
… for the detection of potassium ions and a nitroaromatic explosive TNT, respectively, key chemical design parameters governing their selectivity have been rationalized. Finally, the combination of the conclusions of this thesis provided an idealized structure of a fluorescent conjugated …
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Investigations of highly conjugated macrocycles and polymers for aggregation and chemical sensing
… of emission in solution over time. Addition of nitroaromatic compounds to solutions of the macrocycles caused quenching of luminescence, but Stern-Volmer constants could not be determined. One of the macrocycles aggregates in solution and shows some order in the solid state. Association …
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Influence of Iron Speciation on Redox Cycling and Reactivity With Persistent Organic Contaminants
… possible FeII complexes with each ligand. For nitroaromatic contaminants, linear free energy relationships (LFERs) are observed between species-specific second-order rate constants (ki; M-1 s-1) and reduction potentials of the FeIII/FeII redox couple, E H0(FeIII/FeII), and the nitroaromatic …
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The reaction of ortho-positronium with nitroaromatics via complex formation
… mechanism by which ortho-positronium reacts with nitroaromatics in solution. These reactions are two to three orders of magnitude faster than expected by simple pickoff. Conjugation of the nitro group with the aromatic ring was found to be a necessary condition for this behavior. The rate constant …
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… to function as an indirect chemical sensor for nitroaromatic compounds is demonstrated with a pyrene-labeled waveguide.
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… to function as an indirect chemical sensor for nitroaromatic compounds is demonstrated with a pyrene-labeled waveguide.
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Degradation of groundwater contaminants by iron containing systems.
… are also an effective method for reducing nitroaromatic compounds, such as pesticides. The objective of this study was to link changes in the mineralogy of goethite particles to changes in the reactivity of an Fe(II)-goethite system. The reactivity of Fe(II)-goethite and Fe(II)-goethite …
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Molecules and materials for the optical detection of explosives and toxic chemicals
… focusing on their utility in the detection of nitroaromatic explosives. Brief descriptions of other analytical methods used for explosives detection are also included. Chapter Two describes the synthesis and optical properties of a new class of conjugated polymers that contain alkyl-amino …
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TNT-contaminated soils remediation for volunteer Army ammunitions plant
… Two (2) technologies were investigated for TNT (nitroaromatic explosive) contaminated soils remediation. The technologies are phytoremediation and thermal incineration. Phytoremediation is an in-site wetlands-type remediation which uses plants. Thermal incineration (mobile) treatment achieves …
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Electrochemical techniques for detection of Tnt and other explosives using disposable screen-printed carbon electrodes
Nitroaromatic and nitramine explosives have been found in the soil and water from many government military bases due to improper storage, weapons testing and production. Run-off from contaminated soil and water can enter underground water and potentially contaminate drinking water for near-by …
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The synthesis and study of novel fluorescence probes for Nitroreductase
… is modulated using a range of reducible nitroaromatic moieties. The synthesis of each compound is also discussed, in addition to the preliminary test for NTR. Chapter 4 discusses a novel family of NTR sensors amenable to bioconjugation through various biocompatible linkages. Structural …
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Mathematical Modeling of Reductive Transformation Kinetics of Branched Degradation Pathways of Groundwater Contaminants
… as chlorinated ethenes, chlorinated ethanes and nitroaromatic explosive compounds (e.g. 2,4,6-Trinitrotoluene (TNT)) degrade in the subsurface primarily by microbially catalyzed reductive transformation reactions. From a regulatory point of view, the capability to simulate the kinetics of these …
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Complexation of Organic Guests and Coordination of Metal Ions by Cyclodextrins: Role of Cyclodextrins in Metal-Guest Interactions
Nitroaromatic explosives, such as trinitrotoluene (TNT), are of particular environmental concern due to their recalcitrance in soils and their potent toxicity and mutagenicity to both aquatic and mammalian species. TNT was the most widely used military explosive through the era encompassing both …
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Characterization of the MexT Regulator of the mexEF-oprN Multidrug Efflux Operon of Pseudomonas aeruginosa
… to their promoter regions. Chloramphenicol, a nitroaromatic antimicrobial that is a substrate for MexEF-OprN and resembles a nitrosated nitrosative stress product accommodated by this efflux system induced expression of mexEF-oprN, but not xenB, or PA2811, and this was dependent upon the MexT …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
… 350 °C to catalyze the thermal dissociation of nitroaromatic explosives, such as 2,4,6 trinitrotolune (TNT), to NO2 prior to detection. The catalytic thermal dissociation (cTD) CRDS was found to have a (1s, 3σ) limit of detection (LOD) of 0.5 ppbv. The LOD was sufficient for the detection of TNT …
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