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 31 for “"OH radical"”.
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An investigation of radiolytic damage to biomolecules in foodstuffs
… initially generates highly reactive free radical species (hydroxyl radical (‘OH), hydrated electrons (e-aq) or hydrogen atoms (H)). These react extremely rapidly with a wide variety of “target" molecules in foodstuffs resulting in small but detectable chemical changes. Hence, assays for …
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Quantum Yields And Mechanism In Titanium Dioxide Mediated Photocatalysis
… that the reaction pathway of {dollar}cdot{dollar}OH radicals in the TiO{dollar}sb2{dollar} suspension is at least partly heterogeneous. A photocatalytic mechanism is proposed.;A method of determining the trapping efficiency of {dollar}cdot{dollar}OH radicals was developed with the help of a spin …
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Separation and Detection of 2,3-Dihydroxybenzoic Acid
… onset of Parkinson's disease. Reactive oxygen radicals produced during oxidative stress have been implicated as an initiator of neuron destruction. Glutamate, an excitatory neurotransmitter, can initiate OH radical formation when present in excess. Oxidative stress on the brain caused by …
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The development of new methods for the assessment of oxygen radical-mediated oxidative damage to biomolecules with special reference to lipids
The involvement of chemically-reactive oxygen radical species (RORS) in the pathogenesis of inflammatory joint diseases has been well documented. Much of the toxicity produced by increased superoxide ion (O2.-) and hydrogen peroxide (H2O2) generation has been attributed to the production of the …
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Monoaromatic hydrocarbons and aldehydes in Las Vegas air
… with the results predicted from the reaction of OH radical with monoaromatic hydrocarbons.
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Non-thermal plasma for water treatment
… different scales. The reactive species such as OH radicals, O3, H2O2 and HO2 can be generated from the reactions that occur at the plasma-water interface. For discharges above water, the effect of positive gas ions, which lead to the formation of positive water ions, is considered the main …
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Density measurement of OH radicals in non-thermal plasmas by laser induced fluorescence and time-resolved absorption spectroscopy
… setups for the optical detection of the OH radical in discharges at atmospheric pressure. The first one allows us to improve the time-resolved broad-band absorption spectroscopy. The main advances of the new set up are a better collimation of the UV light and a novel gating scheme. They …
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Development of Photocatalytic Reactor Technology for the Production of Fermentable Sugars
… were first screened based on their OH radical production rates using coumarin as a probe. TiO2 P25 was the photocatalyst that was found to have the highest OH radical production rate of 35.6 μM/hr, followed by Pt-C3N4 (0.88 μM/hr) and WO3 (0.28 μM/hr). LaCr-SrTiO3, Cr-SrTiO3 and …
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Laboratory studies on the production of alpha-pinene-derived organic nitrates and their atmospheric fate
… we quantified the organic nitrate yield from the OH radical oxidation of α-pinene under high NO<sub>x</sub> conditions. The α-pinene- derived nitrates created in chamber experiments readily partitioned to the aerosol phase and underwent particle phase hydrolysis, indicating that these processes …
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Kinetics and dynamics measured using IntraCavity Laser Absorption Spectroscopy
… cm-1) spectra of the second overtone of the OH stretch of trans-nitrous acid recorded between 10,230 and 10,350 cm-1. The spectra were analyzed to yield a complete set of rotational parameters and an absolute band intensity, and two groups of anharmonic perturbations were observed and …
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A study of the tropospheric oxidation of volatile organic compounds using chemical ionization mass spectrometry
… in the oxidation of methane is the methylperoxy radical (CH302). The kinetic rate coefficient of the reaction of CH302 with NO was measured at 298 K and 100 Torr. The kinetics of the reaction of CH302 with HO2 were then examined. Aromatics are another important class of trace species found in the …
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Quantification of complex DNA damage by ionising radiation: An experimental and theoretical approach
… from the dependence of the yield of OH radicals escaping intra-track recombination on photon energy. As energy decreases the OH radical yield initially decreases reflecting an increased ionisation density. However, with further decrease in photon energy the yield of OH radicals …
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Optical measurements of nano-aluminum combustion in a heterogeneous shock tube and in a flat flame burner
… gases within the shock tube, specifically the OH radical chosen for its limited participation in the combustion event, a comparison can be made between the transient heat release of the particle and the luminosity curve giving a better understanding of nano-aluminum burntime. Also, similar …
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Laboratory Studies of Gas-Grain Processes on Cosmic Dust Analogues
… intermediate product in the reaction, the OH radical, is also inferred. Hydroxylamine is a precursor to the formation of glycine, which is the simplest amino acid. The formation of hydroxylamine via the oxidation of ammonia is studied by sequential deposition of ammonia and atomic oxygen …
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Multiphase Aging of Atmospheric Biomass Burning Brown Carbon
… of this reactive species, with no indication of OH radical formation. This has implications for anoxic, solid-like particles, where oxygen availability is low. Lastly, the enhancement in the absorption properties of biomass burning aerosols by short-term (1 hour) aging with low mixing ratios of …
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Autoignition and emission characteristics of gaseous fuel direct-injection compression-ignition combustion
… predicted by FlameMaster simulation. OH radical distribution in the flame was visualized utilizing Planar Laser Induced Fluorescence (PLIF). Single-shot OH-PLIF images revealed the stochastic nature of the autoignition process of non-premixed methane jets. Examination of the …
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Formation and Stabilization of Combustion-Generated Environmentally Persistent Free Radicals on Transition Metal Oxides Supported on Silica
The formation of environmentally persistent free radicals in combustion system was investigated from chemisorptions of chlorine- and hydroxy-substituted benzenes on transition metal oxide surface under post-combustion conditions. This manuscript reports the formation of EPFRs on silica particles …
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Thermochemistry reaction paths and oxidation kinetics on ketonyl and aldehydic nitrogen oxides, propene and isooctane: a theoretical study
… (2,2,4-trimethyl pentane) and its four carbon radicals from loss of hydrogen atoms, and kinetics of the tertiary isooctane radical reaction with O_2 are determined. The computed standard enthalpy of formation of isooctane from this study is -54.40 kcal mol^{-1}. The major products from reaction …
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Development of Reactor Technology for the Photoelectrolysis of Seawater
… transfer with increased coumarin degradation and OH radical formation at increased propeller rotation speeds of 300 RPM.<br/><br/>The propeller was then deployed as a photoanode within a PEC system to generate active chlorine. Titania nanotubes were grown on the surface of the propeller using a …
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A global study of tropospheric methane chemistry and emissions
… in the model, all influencing the tropospheric OH radical, methane’s major sink. OH was high biased relative to observational estimates, a common feature of chemistry-climate models. Methane emissions were increased to 585 Tg(CH4) yr-1 with a latitudinal shift to larger tropical emissions. This …
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