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Letteratura scientifica selezionata sul tema "Radical hydroxyl"

Autore: Grafiati

Pubblicato: 31 agosto 2024

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Articoli di riviste sul tema "Radical hydroxyl"

Venkatachalapathi, A., Abdul Kaffoor H e S. Paulsamy. "In vitro antioxidant activity and polyphenol estimation of methanolic fruit extract of Carissa spinarum L." Journal of Ayurvedic and Herbal Medicine 3, n. 3 (30 settembre 2017): 122–26. http://dx.doi.org/10.31254/jahm.2017.3304.

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Antioxidant property of methanolic fruit extract of the medicinal tree species, Carissa spinarum was evaluated by studying the contents of total phenolics, tannins and flavonoids, free radical scavenging activity using 1,1-diphenyl-2- picryl hydrozyl (DPPH), hydroxyl radical scavenging activity, reducing power activity, ABTS•+ assay and metal chelating activity. The results of the study revealed that both the parts studied were found to have potent antioxidant activity against DPPH, hydroxyl and ABTS•+ radicals with the IC50 value of 88.98 for methanolic fruit extract for DPPH radicals and 849.70 for hydroxyl radicals. Therefore methanolic fruit extract of C. spinarum can be considered as a new potential source of natural antioxidants for pharmaceutical industries.

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Utsumi, Hideo, Sang-Kuk Han e Kazuhiro Ichikawa. "Enhancement of hydroxyl radical generation by phenols and their reaction intermediates during ozonation". Water Science and Technology 38, n. 6 (1 settembre 1998): 147–54. http://dx.doi.org/10.2166/wst.1998.0247.

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Generation of hydroxyl radicals, one of the major active species in ozonation of water was directly observed with a spin-trapping/electron spin resonance (ESR) technique using 5,5-dimethyl-1-pyrrolineN-oxide (DMPO) as a spin-trapping reagent. Hydroxyl radical were trapped with DMPO as a stable radical, DMPO-OH. Eighty μM of ozone produced 1.08 X 10-6M of DMPO-OH, indicating that 1.4% of •OH is trapped with DMPO. Generation rate of DMPO-OH was determined by ESR/stopped-flow measurement. Phenol derivatives increased the amount and generation rate of DMPO-OH, indicating that phenol derivatives enhance •OH generation during ozonation of water. Ozonation of 2,3-, 2,5-, 2,6-dichlorophenol gave an ESR spectra of triplet lines whose peak height ratio were 1:2:1. ESR parameters of the triplet lines agreed with those of the corresponding dichloro-psemiquinone radical. Ozonation of 2,4,5- and 2,4,6-trichlorophenol gave the same spectra as those of 2,5- and 2,6-dichlorophenol, respectively, indicating that a chlorine group in p-position is substituted with a hydroxy group during ozonation. Amounts of the radical increased in an ozone-concentration dependent manner and were inhibited by addition of hydroxyl radical scavengers. These results suggest that p-semiquinone radicals are generated from the chlorophenols by hydroxyl radicals during ozonation. The p-semiquinone radicals were at least partly responsible for enhancements of DMPO-OH generation.

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Rao, Ashwathanarayana. "STUDY ON ANTIOXIDANT AND CYTOTOXIC PROPERTIES OF OLEA DIOICA ROXB. CRUDE EXTRACT AND ITS PURE COMPOUND COLLECTED FROM WESTERN GHATS, KARNATAKA, INDIA." Asian Journal of Pharmaceutical and Clinical Research 10, n. 2 (1 febbraio 2017): 356. http://dx.doi.org/10.22159/ajpcr.2017.v10i2.15727.

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Introduction: Olea dioica Roxb. an important medicinal tree plants used by local siddha tribes, belongs to the family Oleaceae. The parts such asleaves, bark, root, and fruits used in the traditional medicine to cure skin diseases, rheumatism, fever, and cancer.Objectives: The anti-oxidant experiment by metal chelating activity, superoxide radicals, hydroxyl radical, 2,2-diphenyl-2-picrylhydrazyl radicals,2,2-azino-bis(3-ethylbenzothiazoline)-6-sulfonic acid radical scavenging assays with in vitro cytotoxicity was tested using trypan blue dye exclusiontechnique and 3-(4, 5 dimethylthiazole-2yl)-2, 5-diphenyltetrazolium bromide assay was conducted.Results: Anti-oxidant experiments revealed that the bark ethanolic extract of the O. dioica plant parts has excellent radical scavenging activity and itsextracted pure compound, Benzene ethanol, 4-hydroxy-alcohol, showed excellent radical scavenging activity higher than the standards used. In vitrocytotoxicity experiments revealed that bark ethanolic extract has excellent cytotoxicity activity and its pure compound benzene-ethanol, 4-hydroxyalcoholalso showed excellentactivitywhichis comparablewith the standardcurcumin.Conclusion: O. dioica bark could be exploited as a valuable source of antioxidant and cytotoxic agent for pharmaceutical industry.Keywords: Olea dioica Roxb, Metal chelating, Superoxide radicals, Hydroxyl radical, 2,2-diphenyl-2-picrylhydrazyl radicals, 2,2-azinobis(3-ethylbenzothiazoline)-6-sulfonic acid radical scavenging,Trypan blue, 3-(4,5dimethylthiazole-2yl)-2,5-diphenyltetrazolium bromide assay, Benzeneethanol, 4-hydroxy-alcohol.

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Zheng, Cheng-Dong, Gang Li, Hu-Qiang Li, Xiao-Jing Xu, Jin-Ming Gao e An-Ling Zhang. "DPPH-Scavenging Activities and Structure-Activity Relationships of Phenolic Compounds". Natural Product Communications 5, n. 11 (novembre 2010): 1934578X1000501. http://dx.doi.org/10.1177/1934578x1000501112.

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Thirty-eight phenolic compounds (including 31 flavonoids) were examined for their DPPH radical-scavenging activities, and structure-activity relationships were evaluated. Specifically, the presence of an Ortho-dihydroxyl structure in phenolics is largely responsible for their excellent antiradical activity. 3-Hydroxyl was also essential to generate a high radical-scavenging activity. An increasing number of hydroxyls on flavones with a 3′,4′-dihydroxyl basic structure, the presence of a third hydroxyl group at C-5′, a phloroglucinol structure, glycosylation and methylation of the hydroxyls, and some other hydroxyls, for example 5-, and 7-hydroxyl in ring A, decreased the radical-scavenging activities of flavonoids and other phenolics.

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Duwe, A. K., J. Werkmeister, J. C. Roder, R. Lauzon e U. Payne. "Natural killer cell-mediated lysis involves an hydroxyl radical-dependent step." Journal of Immunology 134, n. 4 (1 aprile 1985): 2637–44. http://dx.doi.org/10.4049/jimmunol.134.4.2637.

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Abstract The role of oxygen radicals in lysis of K562 target cells by human natural killer (NK) cells was determined by addition of scavengers of these free radicals. Lysis was greatly reduced under hypoxic conditions. Superoxide dismutase and cytochrome c, scavengers of superoxide anions, and catalase and scavengers of hypochlorite had no effect on lysis. Of 15 hydroxyl radical scavengers tested, 13 inhibited lysis. These were not toxic, because cell morphology and spontaneous chromium release were not affected and preculture with scavengers was not inhibitory. These scavengers differed widely in structure, but degree of inhibition of lysis correlated with their rate constants (k) for reaction with hydroxyl radical (k vs log inhibitor concentration required to decrease lysis by 50%: r = -0.9202, p less than 0.001), showing that inhibition was due to inactivation of the hydroxyl radical. Target cell binding was not reduced at concentrations that inhibited lysis. Inhibitors of the lipoxygenase pathway also decreased lysis, suggesting this pathway to be the source of hydroxyl radicals. In view of the reported requirements for hydroxyl radical-mediated lipid peroxidation for optimal secretory activity in a number of cell types, it appears that the generation of hydroxyl radicals by NK cells is required for delivery of cytotoxic factors.

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Flitter, W. D., e R. P. Mason. "The spin trapping of pyrimidine nucleotide free radicals in a Fenton system". Biochemical Journal 261, n. 3 (1 agosto 1989): 831–39. http://dx.doi.org/10.1042/bj2610831.

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The reaction of the hydroxyl radical, generated by a Fenton system, with pyrimidine deoxyribonucleotides was investigated by using the e.s.r. technique of spin trapping. The spin trap t-nitrosobutane was employed to trap secondary radicals formed by the reaction of the hydroxyl radical with these nucleotides. The results presented here show that hydroxyl-radical attack on thymidine, 2-deoxycytidine 5-monophosphate and 2-deoxyuridine 5-monophosphate produced nucleotide-derived free radicals. The results indicate that .OH radical attack occurs predominantly at the carbon-carbon double bond of the pyrimidine base. The e.s.r. studies showed a good correlation with previous results obtained by authors who used x- or gamma-ray irradiation to generate the hydroxyl radical. A thiobarbituric acid assay was also used to monitor the damage produced to the nucleotides by the Fenton system. These results showed qualitative agreement with the spin-trapping studies.

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Gebicka, L., e J. L. Gebicki. "Scavenging of oxygen radicals by heme peroxidases." Acta Biochimica Polonica 43, n. 4 (31 dicembre 1996): 673–78. http://dx.doi.org/10.18388/abp.1996_4463.

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The reactions of two heme peroxidases, horseradish peroxidase and lactoperoxidase and their compounds II (oxoferryl heme intermediates, Fe(IV) = O or ferric protein radical Fe(III)R.) and compounds III (resonance hybrids [Fe(III)-O2-. Fe(II)-O2] with superoxide radical anion generated enzymatically or radiolytically, and with hydroxyl radicals generated radiolytically, were investigated. It is suggested that only the protein radical form of compound II of lactoperoxidase reacts with superoxide, whereas compound II of horseradish peroxidase, which exists only in oxoferryl form, is unreactive towards superoxide. Compound III of the investigated peroxidases does not react with superoxide. The lactoperoxidase activity loss induced by hydroxyl radicals is closely related to the loss of the ability to form compound I (oxoferryl porphyrin pi-cation radical, Fe(IV) = O(Por+.) or oxoferryl protein radical Fe(IV) = O(R.)). On the other hand, the modification of horseradish peroxidase induced by hydroxyl radicals has been reported to cause also restrictions in substrate binding (Gebicka, L. & Gebicki, J.L., 1996, Biochimie 78, 62-65). Nevertheless, it has been found that only a small fraction of hydroxyl radicals generated homogeneously does inactivate the enzymes.

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Bi, Yong Guang, e Chun Chun Liu. "Study on Scavenging Free Radical Activity with Polysaccharides Materials in Chuanxiong Based on Composite Properties of Biomaterials". Advanced Materials Research 583 (ottobre 2012): 244–47. http://dx.doi.org/10.4028/www.scientific.net/amr.583.244.

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By using spectrophotometric detection of the Chuanxiong polysaccharides on the free radical scavenging. The results show that the Chuanxiong polysaccharides on DPPH radical, hydroxyl radical (HO•) and superoxide anion radical (•) clearance. Scavenging ability with the the Chuanxiong polysaccharide concentration increased, and showed the dose-effect relationship. Concentration of 2.0mg/mL when DPPH radicals clear the rate of 35.61%, while the rate of hydroxyl radicals and superoxide anion radical scavenging, clear the rate of 57.78% and 57.14%. Chuanxiong polysaccharide is an ideal natural antioxidants and good prospects for the development of biomedical composites.

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Wasselin-Trupin, V., G. Baldacchino e B. Hickel. "Détection des radicaux OH et O2 issus de la radiolyse de l'eau par chimiluminescence résolue en temps". Canadian Journal of Physiology and Pharmacology 79, n. 2 (1 febbraio 2001): 171–75. http://dx.doi.org/10.1139/y00-090.

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A new method for the detection of low concentrations of hydroxyl and superoxide radicals, formed by water radiolysis, is described in this article. The method used is the time resolved chemiluminescence. It has been performed with an electron beam delivered by a Febetron 707 accelerator. This method allows to measure hydroxyl and superoxide radical concentrations in a large range of concentrations, between 105 and 108 M.Key words: chemiluminescence, pulse radiolysis, hydroxyl radical, superoxyde radical.[Traduit par la Rédaction]

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Elliot, A. John, Shahsultan Padamshi e Jana Pika. "Free-radical redox reactions of uranium ions in sulphuric acid solutions". Canadian Journal of Chemistry 64, n. 2 (1 febbraio 1986): 314–20. http://dx.doi.org/10.1139/v86-053.

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The radiolytic reduction of uranyl ions in degassed sulphuric acid solutions containing various organic solutes was studied. It was shown that while ĊOOH, CO2−, and α-hydroxy-alkyl radicals reduced uranyl ions, the β-hydroxy-alkyl radicals and those derived from gluconic acid could not affect the reduction. The oxidation of uranium(IV) by hydrogen peroxide at pH 0.7 involves hydroxyl radicals in a chain mechanism but at pH 2.0 the oxidation proceeds by a non-radical reaction pathway. From the enhancement of the rate of oxidation of uranium(IV) by oxygen in the presence of 2-propanol, a mechanism involving the perhydroxyl radical, which reconciles earlier published data on kinetics and oxygen tracer studies, is proposed for the oxygen-uranium(IV) reactions.

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Più fonti

Tesi sul tema "Radical hydroxyl"

Smith, Mathew D. "Reaction of hydroxyl radical with aromatic systems". Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1399191.

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The regioselectivity of the reaction of hydroxyl radical addition to toluene and naphthalene are examined in this study over the temperature range of 25°C-45°C. Also, the relative rates of reactivity as compared to benzene are determined for toluene, naphthalene, mesitylene, and p-xylene over the same temperature range. 2-(t-Butylazo)prop-2-yl hydroperoxide was used as the hydroxyl radical source and 1,1,3,3-tetramethylisoindolin-2-yloxyl was used as radical trap. For toluene the relative rates of addition were found to be 4 times greater for the ortho position versus the meta postion and 2 times greater for the para position versus the meta position, when the number of meta and para sites are taken into account.
Department of Chemistry

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Mitroka, Susan M. "Modulation of Hydroxyl Radical Reactivity and Radical Degradation of High Density Polyethylene". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77137.

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Oxidative processes are linked to a number of major disease states as well as the breakdown of many materials. Of particular importance are reactive oxygen species (ROS), as they are known to be endogenously produced in biological systems as well as exogenously produced through a variety of different means. In hopes of better understanding what controls 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 polymers, biomolecules, etc.) are critical to understanding the reactivity of ROS. A detailed review of the literature, focusing primarily on the hydroxyl radical (HO•) and hydrogen atom (H•) abstraction reactions, is presented in Chapter 1. Also reviewed herein is the literature concerning high density polyethylene (HDPE) degradation. Exposure to treated water systems is known to greatly reduce the lifetime of HDPE pipe. While there is no consensus on what leads to HDPE breakdown, evidence suggests oxidative processes are at play. The research which follows in Chapter 2 focuses on the reactivity of the hydroxyl radical and how it is controlled by its environment. The HO• has been thought to react instantaneously, approaching the diffusion controlled rate and showing little to no selectivity. Both experimental and calculational evidence suggest that some of the previous assumptions regarding hydroxyl radical reactivity are wrong and that it is decidedly less reactive in an aprotic polar solvent than in aqueous solution. These findings are explained on the basis of a polarized transition state that can be stabilized via the hydrogen bonding afforded by water. Experimental and calculational evidence also suggest that the degree of polarization in the transition state will determine the magnitude of this solvent effect. Chapter 3 discusses the results of HDPE degradation studies. While HDPE is an extremely stable polymer, exposure to chlorinated aqueous conditions severely reduces the lifetime of HDPE pipes. While much research exists detailing the mechanical breakdown and failure of these pipes under said conditions, a gap still exists in defining the species responsible or mechanism for this degradation. Experimental evidence put forth in this dissertation suggests that this is due to an auto-oxidative process initiated by free radicals in the chlorinated aqueous solution and propagated through singlet oxygen from the environment. A mechanism for HDPE degradation is proposed and discussed. Additionally two small molecules, 2,3-dichloro-2-methylbutane and 3-chloro-1,1-di-methylpropanol, have been suggested as HDPE byproducts. While the mechanism of formation for these products is still elusive, evidence concerning their identification and production in HDPE and PE oligomers is discussed. Finally, Chapter 4 deals with concluding remarks of the aforementioned work. Future work needed to enhance and further the results published herein is also addressed.
Ph. D.

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Lenton, K. J. "Hydroxyl radical scavengers and antioxidants in radiation protection". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32339.pdf.

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McKay, Garrett J. "Reactivity of the hydroxyl radical with organic matter". Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527332.

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The goal of this study was to investigate some of the fundamental chemistry of the reactions between the hydroxyl radical and apply this knowledge to the treatment of chemical contaminants in real world waters. To accomplish this goal, the techniques of electron pulse radiolysis were used to quantify second-order rate constants for the reaction between the HO^· radical and well characterized OM samples. Studies of HO^· radical reactivity with model polyethylene glycol polymers were performed to help understand OM-HO^· reactivity. Experiments using steady state radiolysis were performed in order to assess the effect of long-term, seasonal variability in OM composition on the degradation of probe compounds used as model chemical contaminants. In addition, the photochemical production of HO^· from OM sensitization was also investigated.

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Black, Helen Dinah. "Kinetics of hydroxyl radical reactions with heterocyclic compounds". Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305373.

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Asuru, Awuri P. "Applications of X-ray Hydroxyl Radical Protein Footprinting". Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1575877091577049.

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Dahlstrom, Stephen W. "Hydroxyl radical activity in bleached root-filled teeth /". Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09DM/09dmd131.pdf.

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Akin, Myles. "Site specific thermodynamic study of OH radical addition to DNA bases". Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33919.

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In medical and health physics, we are interested in the effects of ionizing radiation on biological systems, in particular, human biology. The main process by which ionizing radiations causes damage to biological systems, is through the creation of radicals close to DNA strands. The radicals are very reactive and those created within close proximity to DNA will react with the DNA causing damage, in particular single strand or double strand breaks. This damage to the DNA can cause mutations that can kill the cell, either mitotically or apoptotically, or possibly lead to a cancerous formation. Therefore it is important to study how these radicals interact with DNA strands for a correlation between the resultant products of radical reactions and DNA strand breaks. For this study, we look at the most important radical, the OH radical and it's addition to DNA bases. We will study, through quantum chemistry, the thermodynamics of OH radical addition to the four bases, Adenine, Guanine, Cytosine and Thymine. The Jaguar program developed by Schrodinger was used for DFT calculations of the Gibbs free energy of the addition. In addition, calculations for the partial charge, HOMO's and Fukui indices were calculated and compared to experiment.

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Barreto, Joao Pedro Cabaco Moniz. "Dioxygen free radical reactions". Thesis, Oxford Brookes University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389105.

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Houtz, Erika. "Hydroxyl radical production in Old Woman Creek National Estuarine Reserve". Connect to resource, 2007. http://hdl.handle.net/1811/28931.

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Thesis (Honors)--Ohio State University, 2007.
Title from first page of PDF file. Document formatted into pages: contains iii, 24 p.; also includes graphics. Includes bibliographical references (p. 32-24). Available online via Ohio State University's Knowledge Bank.

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Più fonti

Libri sul tema "Radical hydroxyl"

Edney, Edward. Hydroxyl radical rate constant intercomparison study. Research Triangle Park, NC: U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory, 1987.

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Sharkey, Paul. Kinetics of hydroxyl radical reactions at low temperatures. Birmingham: University of Birmingham, 1994.

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Carter, Campbell D. Saturated fluorescence measurements of the hydroxyl radical in laminar high-pressure flames. West Lafayette, Ind: Purdue University, 1990.

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Carter, Campbell D. Saturated fluorescence measurements of the hydroxyl radical in laminar high-pressure flames. West Lafayette, Ind: Purdue University, 1990.

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Atkinson, Roger. Kinetics and mechanisms of the gas-phase reactions of the hydroxyl radical with organic compounds. [Washington, DC]: American Chemical Society, 1989.

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Harris, Stephen John. Kinetic and mechanistic studies of the hydroxyl radical initiated photo-oxidation of saturated hydrocarbons under simulated atmospheric conditions. Birmingham: University of Birmingham, 1988.

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Manning, Marcus. Kinetics and mechanisms for hydroxyl radical and chlorine atom initiated oxidation of a series of chloroethanes, chloroethenes and 2-chloroethanols. Dublin: University College Dublin, 1999.

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A, Knight B., Shirley J. A e Lewis Research Center, a cura di. Development of UV optical measurements of nitric oxide and hydroxyl radical at the exit of high pressure gas turbine combustors: Final report (March 1995 to March 1998). [East Hartford, CT]: United Technologies Research Center, 1998.

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Crosley, David R. Local measurement of tropospheric HOx: Summary of a workshop held at SRI International, Menlo Park, California, March 23-26, 1992. Hampton, Va: Langley Research Center, 1994.

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United States. National Aeronautics and Space Administration., a cura di. Spectroscopic study of combustion diagnostics on hydroxyl radicals: Final research report. Huntsville, Ala: The University of Alabama in Huntsville, 1990.

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Capitoli di libri sul tema "Radical hydroxyl"

Irvine, William M. "Hydroxyl Radical". In Encyclopedia of Astrobiology, 1167–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1810.

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Irvine, William M. "Hydroxyl Radical". In Encyclopedia of Astrobiology, 793–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1810.

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Irvine, William M. "Hydroxyl Radical". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1810-4.

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O'Brien, Robert J., e Thomas M. Hard. "Tropospheric Hydroxyl Radical". In Advances in Chemistry, 323–71. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/ba-1993-0232.ch012.

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Irvine, William M. "Hydroxyl Radical (OH)". In Encyclopedia of Astrobiology, 1396. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_1810.

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McKenzie, Thomas G., Amin Reyhani, Mitchell D. Nothling e Greg G. Qiao. "Hydroxyl Radical Activated RAFT Polymerization". In ACS Symposium Series, 307–21. Washington, DC: American Chemical Society, 2018. http://dx.doi.org/10.1021/bk-2018-1284.ch014.

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Bell, David M., Manuela Cirtog, Jean-François Doussin, Hendrik Fuchs, Jan Illmann, Amalia Muñoz, Iulia Patroescu-Klotz, Bénédicte Picquet-Varrault, Mila Ródenas e Harald Saathoff. "Preparation of Experiments: Addition and In Situ Production of Trace Gases and Oxidants in the Gas Phase". In A Practical Guide to Atmospheric Simulation Chambers, 129–61. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22277-1_4.

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AbstractPreparation of the air mixture used in chamber experiments requires typically the injection of trace gases into a bath gas. In this chapter, recommendations and standard protocols are given to achieve quantitative injections of gaseous, liquid or solid species. Various methods to produce ozone, nitrate radicals and hydroxyl radicals are discussed. Short-lived oxidants need to be produced during the experiment inside the chamber from pre-cursor species. Because highly reactive oxidants like hydroxyl radicals are challenging to detect an alternative method for the quantification of radical concentrations using trace molecules is described.

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Jagannathan, Indu, e Jeffrey J. Hayes. "Hydroxyl Radical Footprinting of Protein-DNA Complexes". In Methods in Molecular Biology™, 57–71. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-60327-015-1_5.

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Costa, Maria, e Dario Monachello. "Probing RNA Folding by Hydroxyl Radical Footprinting". In Methods in Molecular Biology, 119–42. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-667-2_7.

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Edwards, John O., e Ruggero Curci. "Fenton Type Activation and Chemistry of Hydroxyl Radical". In Catalysis by Metal Complexes, 97–151. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-0984-2_4.

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Atti di convegni sul tema "Radical hydroxyl"

King, Matthew, e Raoul Kopelman. "Development of a hydroxyl radical nanoprobe". In International Symposium on Biomedical Optics, a cura di Gerald E. Cohn. SPIE, 2002. http://dx.doi.org/10.1117/12.469776.

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Zhao, Yi Yi, Mark P. Wilson, Tao Wang, Igor V. Timoshkin e Scott J. MacGregor. "Hydroxyl radical production in DC streamer discharge". In 2015 IEEE Pulsed Power Conference (PPC). IEEE, 2015. http://dx.doi.org/10.1109/ppc.2015.7296962.

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Dong, Fang, Qinzhao Xue, Jingli Liu, Zhanyong Guo, Hongmao Zhong e Huili Sun. "The Influence of Amino and Hydroxyl of Chitosan on Hydroxyl Radical Scavenging Activity". In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163624.

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Zhang, Fenghua, Changzheng Zhou e Chuanlin Tang. "Capacity of Hydroxyl Radical Produced by Choking Cavitator". In The 3rd International Conference on Machinery, Materials Science and Energy Engineering (ICMMSEE 2015). WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814719391_0024.

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Khalil Hasan, Ahmed E., e Ashwani K. Gupta. "Hydroxyl Radical Distribution under Colorless Distributed Combustion Conditions". In 52nd Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0459.

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DeMore, William B. "Rates of hydroxyl radical reactions with some HFCs". In Environmental Sensing '92, a cura di Harold I. Schiff e Ulrich Platt. SPIE, 1993. http://dx.doi.org/10.1117/12.140207.

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Han, Ruixia, Gang Li e Yong-Guan Zhu. "Humic Substances Affect Iron-Driven Hydroxyl Radical Production". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.15484.

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Mooney, C. E., L. C. Anderson e J. H. Lunsford. "Formation and desorption of hydroxyl radicals during Pt-catalyzed oxidation". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thii4.

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Abstract (sommario):

Heterogeneously catalyzed reactions often involve reactive radical intermediates that are produced on the surface and subsequently desorb into the gas phase. In this work, laser-induced fluorescence (LIF) has been used to measure OH radical desorption from a catalytically active polycrystalline platinum wire during the oxidation of methane and hydrogen. The temperature range of the wire was 900 K to 1300 K, and reactant partial pressures were kept between 1 and 20 mtorr to minimze any gasphase reactions. Under these conditions the surface reactions and energetics involving the hydroxyl radical can be studied for Pt-catalyzed oxidation by observing the LIF intensity when changing reaction conditions. The concentration of gas-phase OH radicals depends not only on the concentration of surface hydroxyl radicals but also on the apparent activation energy for OH desorption. This activation energy was found to be inversely related to oxygen coverage, varying from ~33 kcal/mol under oxygen-rich conditions to ~55 kcal/mol under oxygen-depleted conditions. The results indicate that the breaking of the Pt-OH is the rate limiting step for the appearance of OH radicals in the gas phase.

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Janik, Ireneusz, e G. Tripathi. "STRUCTURAL CHARACTERIZATION OF HYDROXYL RADICAL ADDUCTS IN AQUEOUS MEDIA". In 70th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2015. http://dx.doi.org/10.15278/isms.2015.th14.

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Milenkovic, Dejan A., Jasmina M. Dimitric Markovic e Zoran S. Markovic. "DFT investigation of the reaction of cyanidin with hydroxyl radical". In 2015 IEEE 15th International Conference on Bioinformatics and Bioengineering (BIBE). IEEE, 2015. http://dx.doi.org/10.1109/bibe.2015.7367647.

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Rapporti di organizzazioni sul tema "Radical hydroxyl"

Lee, Y., H. Pennline e J. Markussen. Flue gas cleanup with hydroxyl radical reactions. Office of Scientific and Technical Information (OSTI), febbraio 1990. http://dx.doi.org/10.2172/7163736.

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Chan, Cornelius. Laser induced hydroxyl radical fluoresence at atmospheric pressure. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.69.

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Calidonna, Sheryl E., e William R. Bradley. The Hydroxyl Radical Reaction Rate Constant and Products of Dimethyl Succinate. Fort Belvoir, VA: Defense Technical Information Center, marzo 2008. http://dx.doi.org/10.21236/ada489770.

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Peterman, Dean R., Gregory P. Horne, Jamie M. Gleason, Anneka J. Miller e Stephen P. Mezyk. Determine rate of reaction of hydroxyl radical with carboxylic acids and polyaminocarboxylates. Office of Scientific and Technical Information (OSTI), aprile 2017. http://dx.doi.org/10.2172/1483694.

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Cohen, N. A shock tube study of the reactions of the hydroxyl radical with combustion species. Office of Scientific and Technical Information (OSTI), maggio 1991. http://dx.doi.org/10.2172/5573201.

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Atherton, C. S. Predicting tropospheric ozone and hydroxyl radical in a global, three-dimensional, chemistry, transport, and deposition model. Office of Scientific and Technical Information (OSTI), gennaio 1995. http://dx.doi.org/10.2172/130611.

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Cohen, N. A shock tube study of the reactions of the hydroxyl radical with combustion species and pollutants. Office of Scientific and Technical Information (OSTI), agosto 1992. http://dx.doi.org/10.2172/6645854.

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Baxley, J. S., e J. R. Wells. The Hydroxyl Radical Reaction Rate Constant and Atmospheric Transformation Products of 2-Butanol and 2-Pentanol. Fort Belvoir, VA: Defense Technical Information Center, aprile 1998. http://dx.doi.org/10.21236/ada380061.

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Sobel, Eugene L., Zoreh Davanipour e Henrik Poulsen. Low Melatonin Production During Adulthood - Phase 2: Association with Levels of Hydroxyl Radical Scavenging and DNA Damage. Fort Belvoir, VA: Defense Technical Information Center, agosto 2004. http://dx.doi.org/10.21236/ada437757.

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Sobel, Eugene, e Zoreh Davanipour. Low Melatonin Production During Adulthood - Phase 2: Association with Levels of Hydroxyl Radical Scavenging and DNA Damage. Fort Belvoir, VA: Defense Technical Information Center, agosto 2005. http://dx.doi.org/10.21236/ada446780.

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