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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 123 for “"Xylene"”.
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The design and synthesis of mixed ligand metal organic frameworks for xylene inclusion
… ligands metal organic frameworks (MOFs) for xylene inclusion. The first part of the study involves the synthesis and characterisation of five pyridine N-donor and O-donor ligands, namely: 2,7-di(pyridin-4-yl)benzo[lmn][3,8]phenthroline-1,3,6,8(2H,7H)tetraone(Lig1), …
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Part One. Diacylation of Meta-Xylene. Part Two. Heterocycles Containing Para-Phenylene Units
Made available in DSpace on 2015-05-12T17:02:23Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0005974.PDF: 5294208 bytes, checksum: 973560a98a301b1181abb94946885b51 (MD5) Previous issue date: 1953
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Understanding orchestrated chemical reactions in toluene/o-xylene monooxygenase from pseudomonas sporium OX1
… methane monooxygenase (sMMO) and toluene/o-xylene monooxygenase (ToMO), are described. The functions and structures of the three or four components of sMMO and ToMO are summarized. Distinctly different dioxygen activation chemistry and hydrocarbon specificity is observed for these two …
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Exploring reactivity and component interactions in Toluene/o-Xylene Monooxygenase from pseudomonas sp. OX1
… toluene 4-monooxygenase, and toluene/oxylene monooxygenase. Comparisons between three- and four-component BMMs are highlighted to demonstrate how nature preserves the control over reactivity within the BMM superfamily. Chapter 2. A Flexible Glutamine Regulates the Catalytic Activity of …
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The biodegradation potential of methanol, benzene, and m-xylene in a saturated subsurface environment
… potential of methanol, benzene, and m-xylene was investigated. Uncontaminated soil from the surface, 12, 16.5, and 18 foot depths was utilized to observe the differences in microbial responses throughout the soil profile. The biodegradation potential of the indigenous microbiota was …
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Thermochemistry and kinetics in pyrolysis and oxidation reaction of oxygenate chlorocarbons, neopentane, and ortho-xylene
… and storage. Oxidation reactions of ortho-xylene are studied to identify the important reaction channels of this class of highoctane aromatics. Elementary reactions, energy well depths, and absolute rate constants of benzylic radical derived from ortho-xylene, 2-methylbenzyl radical with …
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The effects of pH on the biodegradation of benzene, toluene, ethylbenzene, m-Xylene in soils
… of benzene, toluene, ethylbenzene, and m-xylene in subsurface soils. The biodegradation potential of both denitrifying and aerobic respiring microorganisms were assessed. Uncontaminated soil from five different soil depths was utilized. The pH of each soil was adjusted, such that a range …
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Dioxygen activation and substrate hydroxylation by the hydroxylase component of toluene/O-xylene monooxygenase from pseudomonas sporium OX1
… BMMs to date. Recent results for the toluene/o-xylene monooxygenase (ToMO) and phenol hydroxylase systems from Pseudomonas sporium OX1 are also briefly summarized, the former being the research focus of this dissertation. Restricting access to the diiron center in ToMOH and other non-heme …
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Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column
In situ biodegradation of p-xylene was studied in a 2.75 inch diameter column using oxygen microbubbles to supply the electron acceptor. One objective was to demonstrate that pxylene can be biodegraded in the soil column and to follow the degradation and pressure drops as a function of time. The …
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The oxidation chemistry of the xylenes and related aromatic hydrocarbons
… for the oxidation chemistry of the isomeric xylenes and benzyl radicals at 753K.A trace amount (0.01 % for kinetic study, 0.5% for product study) of each xylene was separately added to slowly reacting mixtures of H₂ + O₂ in aged boric-acid-coated Pyrex reaction vessels at 753K and 500 Torr …
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A Study of the Patterns, Stoichiometry, and Kinetics of Microbial BTX Degradation Under Denitrifying Conditions by an Activated Sludge Consortium Receiving a Mixed Waste
… and kinetics of microbial benzene, toluene, p-xylene, m-xylene, and o-xylene degradation by a denitrifying activated sludge consortium was investigated in a sequencing batch reactor (SBR) receiving a mixed waste. After six months of acclimation, toluene and m-xylene were routinely degraded to …
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Biodegradability of nitroxylene isomers
… studies were conducted beginning with three xylene isomers: ortho-xylene, meta-xylene and para-xylene; and continued with the four mononitroxylene (MNX) isomers, culminating with testing ten dinitroxylene (DNX) isomers. Soil samples were obtained from a historically contaminated site with …
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Aplicação de microemulsões na solubilização de frações pesadas de petróleo
… (system 1); UNITOL L 90 - n-Butanol - Water - Xylene (system 2); UNITOL L 90 n-Butanol - Water - Kerosene/Xylene 10% (system 3); UNITOL L 90 - Sec-Butanol - Water - Xylene (system 4). In parallel experiments of physical adsorption were carried out by the static method, with the intention of …
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Equilíbrio de fases de soluções polidispersas de polímeros
… modeling to describe polypropylene extraction in xylene, the well-known XS (xylene solubles) test. The XS experiment constitutes a usual procedure in many polymer laboratories, used to determine the percentage of xylene solubles in samples of polypropylene, which correspond to an approximate …
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Molecular and Genetic Relationships of Aromatic Metabolic Plasmids in Pseudomonads
… substrates naphthalene, NAH, salicylate, SAL, xylene and toluene, XYL and TOL. Naphthalene and xylene dissimilation pass through salicylate and toluate as intermediates to converge at catechol or its methylated derivative. Catechol is further dissimilated, through the (alpha)-keto acid pathway …
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Investigations into the determination of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) by capillary gas chromatography
… octane, nonane, dodecane, benzene, toluene, p-xylene, o-xylene, and mesitylene. Temperatures of the capillary column, the injection port, the GC/MS interface, the flow rates of carrier gas and make-up gas, and the injection volume were optimized by one factor at a time method or simplex …
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The Kinetics, Biochemical Patterns, and Microbial Ecology in Multiredox (Anoxic, Microaerobic, Aerobic) Activated Sludge Systems Treating BTX Containing Wastewater
… reactors. The studies showed that toluene and m-xylene were denitrified via benzoyl-CoA reductase. Although benzene, o-, and p-xylene were recalcitrant under denitrifying conditions, they were biodegraded under microaerobic (< 0.2 mg/L dissolved oxygen) and nitrate or nitrite (NOx)-supplemented …
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High Pressure Study of Viscosity Effects on the Luminescence of Some S-Tetracyanobenzene Eda Complexes
… Lifetime measurements for the complexes of o-xylene and p-xylene with TCNB yielded the two radiative rates (k(,EQ) and k(,FC)) as well as the rate of relaxation from FC to the EQ excited state (k(,RE)). k(,RE) was found to correlate well with viscosity and to be independent of temperature at …
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The chemical composition, antimicrobial and antioxidant properties of the essential oils of Tulbaghia violacea Harv and Eucalyptus grandis W.Hill ex Maiden.
… were found to be 2,4- Dithiapentane (51.04%), p- Xylene (4.43%),Chloromethylmethyl sulfide (8.62%), O- Xylene (6.08%), Thiodiglycol (6.17%), and p- xylol (5.88%); these together constituted 82.22% of the extracted oil. The main constituents (81.44%) of the essential oils of Eucalyptus grandis were …
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Tunable and High Refractive Index Polydimethylsiloxane Polymers for Label-Free Optical Sensing
… index PDMS films to differentiate between m-xylene and cyclohexane was demonstrated by monitoring changes in refractive index and thickness following absorption of these analytes using a refractometer at 1550 nm. The sensitivity of the refractive index response to an analyte using a …
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