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 14 of 14 for “"active oxygen"”.
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Part1. Relative antioxidant efficiency of synthetic and natural compounds; Part 2. Synthesis, characterization of cysteine oligopeptides and assessment of their antioxidant activity
… kelp etc. Assessment included the classical active oxygen method (AOM) and gas chromatographic - mass spectrometry determinations of oxidative degradation products...The second part of the research involved enzymatic synthesis and liquid chromatographic - mass spectrometric (LC-MS) …
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Molecular detection and charcaterisation of biologically relevant free radicals during surgical ischaemia-reperfusion
Oxygen is one of the most important molecules in human beings. Our research is focused on how the human body can respond and adapt to the physiological challenge posed by a lack of oxygen. Ascorbic acid (Vitamin C) is one of the most important and considered the most effective water-soluble, …
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Molecular mechanisms of the carcinogen chromium(VI)-induced DNA-protein crosslinking in cultured intact human cells
… crosslinks may, in part, be due to generation of active oxygen species following the intracellular reduction of Cr(V1) and that antioxidants may ameliorate the genotoxic and carcinogenic effects of Cr(VI). We proposed to test our hypothesis with the following specific aims: 1) To characterize the …
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Cholesterol metabolism in the endoplasmic reticulum of rat liver
… cytochrome P-450. The use of chemical donors of "active oxygen" in the reconstitution of cholesterol 7a-hydroxylase activity with liver microsomal cytochrome P-450 was shown to be limited by the rapid destruction of the cytochrome by these agents.
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A dimensional analysis of the benzylic hydroxylase active site in mortierella isabellina
The spatial limits of the active site in the benzylic hydroxylase enzyme of the fungus Mortierella isabellina were investigated. Several molecular probes were used in incubation experiments to determine the acceptability of each compound by this enzyme. The yields of benzylic alcohols provided …
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Oxide inclusion evolution and factors that influence their size and morphology
… the effects of preexisting inclusions, steel active oxygen content, and supersaturation on the size and morphology of Al<sub>2</sub>O<sub>3</sub> inclusions.</p> <p>The inclusion size, composition, and morphology following steel deoxidation were found to depend on the steel conditions during …
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Partial Oxidation of Hydrocarbons Over Ceria Zirconia Catalysts
… are summarized from a perspective describing active oxygen species on catalyst surfaces. Some oxygen species are more selective than others and if these species were better understood, a catalyst surface could be tuned to produce those selective species instead of unselective ones. However, …
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Role of xanthophyll and water-water cycles in the protection of photosynthetic apparatus in Arbutus unedo and Arabidopsis thaliana
… and thereby prevent the formation of damaging active oxygen species (AOS). Violaxanthin deepoxidase (VDE) converts violaxanthin (V) to antheraxanthin (A) and zeaxanthin (Z) defending the photosynthetic apparatus from excess of light. Another important biological pathway is the chloroplast …
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Role of Reactive Oxygen Species and Altered Biochemical Pathways in Cellular Aging
No abstract prepared.
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Effects of MPTP, MPP(+) and Adreno-Medullin on Dopamine Metabolism in the Rat Corpus Striatum
… and 1-methyl-4-phenylpyridine (MPP$\sp+$), an active metabolite of MPTP, have been demonstrated. First, oxidation of MPTP catalyzed by monoamine oxidase can generate hydrogen peroxide and other active oxygen species, which might then initiate oxidative damage to the cells. Also, MPTP and …
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Implications For the Role of the Peroxoferric Intermediate In the Second Step of Nitric Oxide Synthase Derived From the Reactivity of P450-Cam With Camphor-5-Oxime and Characterization of the Heme Iron Coordination Structures of Tyrosine- and Histidine-Ligated Heme Enzymes Using Magnetic Circular Dichroism Spectroscopy
… (P450s) are membrane-bound thiolate-ligated monooxygenases that play critical roles in steroid biosynthesis and drug metabolism. Although discovered over fifty years ago, a major remaining challenge in the study of these enzymes has been to establish the reactivity of the different active oxygen …
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Scientific principles for the electric oxygen-iodine laser
… the scientific understanding of the electric oxygen-iodine laser (EOIL). The research reported on herein was largely conducted between the years of 2006 and 2011. The work comes on the forefront of EOIL development, recently demonstrated in 2005 with positive gain and lasing through a …
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Protective effect of dietary antioxidants and plant extracts on acute inflammation and hepatotoxicity in vitro
… from sites of inflammation. This suggests that active oxygen species and some cytokines generated in the inflamed tissues can cause injury to DNA and ultimately lead to carcinogenesis. Diethylnitrosamine (DEN) is one of the most important environmental carcinogens, present in a variety of foods, …
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SOLID-SUPPORTED PORPHYRINS FOR CATALYSIS AND SENSING
… diastereoselectivities. Notably, the system was active by applying challenging acceptor-acceptor ethyl diazo malonate (EDM) yielding the corresponding cyclopropane in 46% yield. A preliminary study in flow chemistry was also performed, using 5@CC at 60 °C in solvent-free condition by pumping a …