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 114 for “"Hydroxyl radical"”.
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Hydroxyl radical additions to arenes
… processes, specifically via reactions with hydroxyl radicals (·OH), and the rate of that degradation, is of interest. Hydroxyl radicals are a major contributor to the breakdown of many contaminants in natural systems. The present study focused on measuring the product distributions from the …
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Hydroxyl radical activity in bleached root-filled teeth
Aims to determine whether hydroxyl radicals are generated when hydrogen peroxide is used to bleach root-filled teeth which have been discoloured by blood components.
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Hydroxyl Radical Production via Acoustic Cavitation in Ultrasonic Humidifier Systems
… of contaminants in water used in the systems. Hydroxyl radicals were found using DMPO as a spin trap. Caffeine and 17β-estradiol, as pharmaceutical contaminants of drinking water, were both emitted from the humidifier when present in the water reservoir and would enter breathing air. Emitted …
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Hydroxyl-Radical Planar Laser-Induced Fluorescence Imaging of Turbulent Supersonic Combustion
… turbulent reacting flow from non-intrusive hydroxyl radical (OH) planar laser-induced fluorescence (PLIF) images are presented. The OH PLIF images show instantaneous structures of turbulence in two combustor configurations at different fuel equivalence ratios in the University of Virginia …
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Hydroxyl radical production via the photo-Fenton reaction in natural waters
This dissertation investigates the importance of photo-Fenton chemistry in natural waters. The Fenton reaction, H202 + Fe(ll) [right arrow] Fe(ll) + OH- + OH', can occur in sunlit waters because both H202 and Fe(ll) are photo-chemically produced. Photo-Fenton chemistry was investigated by …
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Modulation of Hydroxyl Radical Reactivity and Radical Degradation of High Density Polyethylene
… the behavior of ROS, researchers have studied radical chemistry on a fundamental level. Fundamental knowledge of what contributes to oxidative processes can be extrapolated to more complex biological or macromolecular systems. Fundamental concepts and applied data (i.e. interaction of ROS with …
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Molecular Probes for Biologically Important Molecules: A Study of Thiourea, Hydroxyl radical, Peroxynitrite and Hypochlorous acid
… visual colorimetric sensing with fluoride. Free radical mediated oxidations of biomolecules are responsible for different pathological conditions in the human body. Superoxide is generated in cells and tissues during oxidative burst. Moderately reactive superoxide is converted to peroxyl, alkoxyl …
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Fundamental Studies of Two Important Atmospheric Oxidants, Ozone and Hydroxyl Radical, Reacting with Model Organic Surfaces
… between probable reaction mechanisms. Hydroxyl radicals (•OH) play a major role processing atmospheric hydrocarbons. Due to their short lifetimes, not much is known about the dynamics of the first steps of •OH reactions. To investigate these reactions, a rotational state-selector was …
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The UV/H2O2 advanced oxidation process in UV disinfection units : removal of selected phosphate esters by hydroxyl radical
… the oxidation of phosphate esters through hydroxyl radical generated by the UV/H202 process applied at a UV disinfection unit was selected for evaluation. The second-order rate constants of the reactions of two phosphate esters, Tri(2-butoxyethyl) phosphate (TBEP) and Tri-2-chloroethyl …
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The Advancement of Mass Spectrometry-based Hydroxyl Radical Protein Footprinting: Application of Novel Analysis Methods to Model Proteins and Apolipoprotein E
… method is that it utilizes the reactivity of hydroxyl radicals to stably modify solvent accessible residues non-specifically in a microsecond. The extent of *OH labeling at sites assays their solvent accessibility. We have corroborated the predicted profoundly short timescale of labeling …
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MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
The hydroxyl radical (OH) is the dominant oxidant in the atmosphere, controlling the lifetimes of volatile organic compounds (VOCs) and contributing to the formation of ozone (O3) and secondary organic aerosols (SOA). The oxidation of VOCs by OH propagates a radical cycle between OH, the …
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Mechanistic Study of Pollutant Degradation
… sonochemical reactions. Fenton degradation uses hydroxyl radical to oxidize organic compounds. The radical is produced by catalytic decomposition of hydrogen peroxide with Fe(II). Further research has found that addition of cyclodextrins can enhance degradation efficiency of hydrophobic organic …
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A Role For Reactive Oxygen Species In Photodynamic Therapy
… interact with oxygen to form superoxide anion radical, which in turn (through the action of superoxide dismutase) is converted to hydrogen peroxide and hydroxyl radical via the Fenton reaction. These reactive oxygen species (ROS) all posses properties (i.e. lifetime, reactivity and diffusion …
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Photophysics and photochemistry of natural waters with emphasis on radical probe development and application
… study of a series of stable nitroxide radical probes that have been used for the quantitative detection of individual carbon-centered radicals and reducing species in natural waters. Two appendices follow. The first contains preliminary experiments utilizing one of the nitroxide probes …
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The Development of Energy Efficient Wastewater Treatment: Electrochemical Oxidation and PFACs liquid-liquid Extraction
… by direct oxidation and indirect oxidation (hydroxyl radical HO•) on the anode. The benefits of EAOPs are: 1) They are driven by electric power. The stoichiometric connection between power consumption and pollutant removal in EAOP is almost linear. Therefore, they are ease of control. 2) they …
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Real-Time Prediction of Lean Blowout using Chemical Reactor Network
… time with regard to blowout proximity. The free radical concentrations and their trends and ratios are studied in each reactor zone. The results indicate that the hydroxyl radical maximum concentration moves downstream as the reactor approaches LBO. The ratio of hydroxyl radical concentrations in …
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Synthesis, crystallography and biological activity of myo-inositol phosphates
… is important in the prevention of hydroxyl radical formation which may allow it to act as a 'safe' carrier of iron within the cell. Here, the hypothesis that the recently discovered natural product, myo-inositol 1,2,3-trisphosphate represents the simplest structure to mimic …
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Balancing Bromate Formation, Organics Oxidation, and Pathogen Inactivation: The Impact of Bromate Suppression Techniques on Ozonation System Performance in Reuse Waters
… water quality parameters, such as through hydroxyl radical exposure and ultraviolet absorption spectrum measurements, which were correlated and utilized to develop a hydroxyl radical exposure predictive model.
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