Relevant bibliographies by topics / Hydroxyl radicals (•OH)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Hydroxyl radicals (•OH)'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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Journal articles on the topic "Hydroxyl radicals (•OH)"

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Utsumi, Hideo, Sang-Kuk Han, and Kazuhiro Ichikawa. "Enhancement of hydroxyl radical generation by phenols and their reaction intermediates during ozonation." Water Science and Technology 38, no. 6 (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 en
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Novelli, Anna, Luc Vereecken, Birger Bohn, et al. "Importance of isomerization reactions for OH radical regeneration from the photo-oxidation of isoprene investigated in the atmospheric simulation chamber SAPHIR." Atmospheric Chemistry and Physics 20, no. 6 (2020): 3333–55. http://dx.doi.org/10.5194/acp-20-3333-2020.

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Abstract. Theoretical, laboratory, and chamber studies have shown fast regeneration of the hydroxyl radical (OH) in the photochemistry of isoprene, largely due to unimolecular reactions which were previously thought not to be important under atmospheric conditions. Based on early field measurements, nearly complete regeneration was hypothesized for a wide range of tropospheric conditions, including areas such as the rainforest where slow regeneration of OH radicals is expected due to low concentrations of nitric oxide (NO). In this work the OH regeneration in isoprene oxidation is directly qua
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Aschmann, Sara M., Janet Arey, and Roger Atkinson. "Reaction of OH radicals with 5-hydroxy-2-pentanone: formation yield of 4-oxopentanal and its OH radical reaction rate constant." Environmental Chemistry 10, no. 3 (2013): 145. http://dx.doi.org/10.1071/en12146.

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Environmental context Alkanes, major constituents of vehicle exhausts, are emitted to the atmosphere where they react, chiefly by gas-phase reactions with the hydroxyl radical, to form products which can also react further. In laboratory experiments, we studied the further reactions of a model first-generation alkane reaction product. Understanding alkane reaction chains is important because the toxicity, secondary aerosol formation and other properties of vehicle emissions can change as new compounds are formed. Abstract 1,4-Hydroxycarbonyls are major products of the gas-phase reactions of al
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Erkovich, A. V., E. I. Korotkova, E. V. Dorozhko, A. N. Solomonenko, and N. V. Aseeva. "Impedance sensor based on N-acetyl-L-cysteine for evaluation of antioxidant activity against hydroxyl radicals." Zhurnal Analiticheskoi Khimii 79, no. 6 (2024): 555–62. https://doi.org/10.31857/s0044450224060022.

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Hydroxyl radical is the most aggressive and dangerous product of incomplete reduction of oxygen in the body, therefore its determination and the influence of various antioxidants on the inhibition of OH-radicals is an urgent task. An impedance-metric sensor for the determination of hydroxyl radicals based on a graphite electrode modified with electrochemically deposited gold and self-organizing monolayer of N-acetyl-L-cysteine (ACC) has been proposed. The use of ACC causes high selectivity of the sensor, and the use of non-Faraday impedance as a method of analytical signal registration allows
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Pan, Xian-Ming, Eugenie Bastian, and Clemens von Sonntag. "The Reactions of Hydroxyl Radicals with 1,4-and 1,3-Cyclohexadiene in Aqueous Solution." Zeitschrift für Naturforschung B 43, no. 9 (1988): 1201–5. http://dx.doi.org/10.1515/znb-1988-0919.

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Abstract The reactions of radiolytically generated hydroxyl radicals and H atoms with 1,4- and 1,3-cyclohexadiene were studied by pulse radiolysis and product analysis. Hydrogen abstraction from these substrates by the OH radical yields the cyclohexadienyl radical (ε (310 nm) = 4400 dm3 mol-1 cm-1 from the reaction of the H atom with benzene) with an efficiency of 50% (0.29 ,μmol J-1) in the case of 1,4-cyclohexadiene and 25% (0.15 ,μmol J-1) in the case of 1,3-cyclohexadiene as determined by pulse radiolysis. The remaining OH radicals add to the olefin. In 1.4-cyclohexa- diene the yield of th
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Seol, Youbin, Minsu Choi, Hongyoung Chang, and Shinjae You. "Study on OH Radical Production Depending on the Pulse Characteristics in an Atmospheric-Pressure Nanosecond-Pulsed Plasma Jet." Materials 16, no. 10 (2023): 3846. http://dx.doi.org/10.3390/ma16103846.

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Hydroxyl radicals (OH) play a crucial role in plasma-bio applications. As pulsed plasma operation is preferred, and even expanded to the nanosecond range, it is essential to study the relationship between OH radical production and pulse characteristics. In this study, we use optical emission spectroscopy to investigate OH radical production with nanosecond pulse characteristics. The experimental results reveal that longer pulses generate more OH radicals. To confirm the effect of pulse properties on OH radical generation, we conduct computational chemical simulations, focusing on two types of
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Harianingsih, Harianingsih, Nur Qudus, and Tonni Agustionio Kurniawan. "Hydroxyl Radicals Production in Nitrogen Fixation with Addition of Fe2+ Ions Using Plasma Electrolysis." Semarak International Journal of Petroleum and Chemical Engineering 1, no. 1 (2024): 51–62. https://doi.org/10.37934/sijpce.1.1.5162.

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Nitrogen fixation using the Haber-Bosch process generates carbon dioxide emissions, so environmentally friendly alternative technologies are needed. Plasma electrolysis is recommended as a nitrogen fixation method that produces liquid nitrate because it does not generate emissions with raw materials from the natural air. The plasma electrolysis process generates hydroxyl radicals in the nitrate formation process. Thus, the aim of this research is to increase hydroxyl radicals by adding Fe2+ ions. The methods used include characterizing the current and voltage strength in the reactor to observe
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Harianingsih, Harianingsih, Nur Qudus, and Tonni Agustionio Kurniawan. "Hydroxyl Radicals Production in Nitrogen Fixation with Addition of Fe2+ Ions using Plasma Electrolysis." Semarak International Journal of Petroleum and Chemical Engineering 1, no. 1 (2024): 51–62. https://doi.org/10.37934/sijpce.1.1.5162a.

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Nitrogen fixation using the Haber-Bosch process generates carbon dioxide emissions, so environmentally friendly alternative technologies are needed. Plasma electrolysis is recommended as a nitrogen fixation method that produces liquid nitrate because it does not generate emissions with raw materials from the natural air. The plasma electrolysis process generates hydroxyl radicals in the nitrate formation process. Thus, the aim of this research is to increase hydroxyl radicals by adding Fe2+ ions. The methods used include characterizing the current and voltage strength in the reactor to observe
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Wang, Suwei, Stephen S. Leonard, Jianping Ye, Min Ding, and Xianglin Shi. "The role of hydroxyl radical as a messenger in Cr(VI)-induced p53 activation." American Journal of Physiology-Cell Physiology 279, no. 3 (2000): C868—C875. http://dx.doi.org/10.1152/ajpcell.2000.279.3.c868.

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The present study investigates whether reactive oxygen species (ROS) are involved in p53 activation, and if they are, which species is responsible for the activation. Our hypothesis is that hydroxyl radical (·OH) functions as a messenger for the activation of this tumor suppressor protein. Human lung epithelial cells (A549) were used to test this hypothesis. Cr(VI) was employed as the source of ROS due to its ability to generate a whole spectrum of ROS inside the cell. Cr(VI) is able to activate p53 by increasing the protein levels and enhancing both the DNA binding activity and transactivatio
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Pozdnyakov, I. P., Yu A. Sosedova, V. F. Plyusnin, et al. "Photodegradation of organic pollutants in aqueous solutions caused by Fe(OH)aq2+ photolysis: Evidence of OH radical formation." International Journal of Photoenergy 6, no. 2 (2004): 89–93. http://dx.doi.org/10.1155/s1110662x04000133.

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Photochemistry of Fe(III) hydroxocomplexes has a great interest because of possibility of hydroxyl radical formation at the primary photochemical step. This mechanism is based mainly on the analysis of the final products of photochemical reactions between light-excited Fe(III) complexes and organic compounds. However, realization of an alternative mechanism of photolysis, based on the intermolecular electron transfer from organic molecules located in the second coordination sphere to the light-excited complex could take place. To distinguish these mechanisms, the experiments on the nanosecond
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Dissertations / Theses on the topic "Hydroxyl radicals (•OH)"

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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. T
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Dolgorouky, Cristina. "Mesure de la réactivité atmosphérique totale avec les radicaux hydroxyles (OH) : développement et applications en Ile-de-France." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00684758.

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Le radical hydroxyle (OH) représente le plus important oxydant dans la troposphère et le puits de la plus grande partie des composés à l'état de trace de l'atmosphère. Si les sources des radicaux hydroxyles sont aujourd'hui relativement bien connues, le terme 'puits' des OH, connu sous le terme de réactivité atmosphérique totale avec les radicaux OH (ou réactivité OH) (s-1), reste encore difficile à quantifier. En raison de la complexité des instruments nécessaires, peu de mesures de OH et de réactivité sont actuellement disponibles et la nouvelle méthode proposée par Sinha et al., (2008) repr
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Park, Ji Ho. "Experimantal and theoretical studies of isoprene oxidation initiated by hydroxyl radical." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1343.

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Isoprene (2-methyl-1,3-butadiene) is the most abundant non-methane hydrocarbon mostly emitted from the trees and its oxidation by hydroxyl radical contributes significantly to the tropospheric ozone production. We investigate the development of a detailed predictive mechanism for isoprene oxidation using both theory and experiment. We have identified a novel cyclization pathway for the radicals formed by hydroxy radical (OH) addition to the inner carbons of isoprene. The pathway predicted that C5 carbonyl compounds are produced, and it may also provide information on the preference of sites fo
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Mustaree, Shayla. "The •OH scavenging effect of bromide ions on the yield of H[subscript 2]O[subscript 2] in the radiolysis of water by [superscript 60]Co γ-rays and tritium β-particles at room temperature : a Monte Carlo simulation study". Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8183.

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Abstract: Monte Carlo simulations were used here to compare the radiation chemistry of pure water and aqueous bromide solutions after irradiation with two different types of radiation, namely, tritium β-electrons (~7.8 keV) and [superscript 60]Co γ-rays/fast electron (~1 MeV) or high energy protons. Bromide ions (Br-) are known to be selective scavengers of hydroxyl radicals •OH precursors of hydrogen peroxide H[subscript 2]O[subscript 2]. These simulations thus allowed us to determine the yields (or G-values) of H[subscript 2]O[subscript 2] in the radiolysis of dilute aqueous bromide solution
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Faider, Wilfrid. "Traitement de l’acétaldéhyde par décharges électriques impulsionnelles dans les mélanges de gaz atmosphériques : cinétique et efficacité énergétique." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112023/document.

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Cette thèse a pour objet l’analyse de la cinétique de la conversion de l’acétaldéhyde, CH₃CHO, à des concentrations initiales inférieures ou égale à 5000 ppm dans un mélange de gaz à base d’azote et contenant jusqu’à 20% d’oxygène, à température ambiante. L’étude a été réalisée en utilisant trois réacteurs mettant en œuvre des décharges de qualités spatiales différentes. Il s’agit d’un réacteur (UV510) à décharge pré-ionisée (photo-déclenchée) par rayonnement UV produisant un plasma homogène, et de deux réacteurs à décharge à barrière diélectrique (DBD), de géométrie plane (plan-plan) et de gé
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Liljegren, Jennifer A. "Experimental and theoretical studies of the kinetics of the hydroxyl radical (OH)-initiated oxidation of volatile organic compounds." Thesis, Indiana University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3602969.

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<p> This research investigates the kinetics of the hydroxyl radical (OH)-initiated oxidation of several volatile organic compounds (VOCs) including ethanol, 3-methylfuran, and methyl ethyl ketone (2-butanone). Oxidation by OH is the dominant loss process for many biogenic and anthropogenic VOCs, making ambient concentrations of OH and the rate constants of OH + VOC reactions useful for determining the lifetime of various VOCs in the atmosphere. The rate constants of OH + VOC reactions are important for improving the accuracy of input parameters used in urban and regional air quality models whi
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Amédro, Damien. "Atmospheric measurements of OH and HO2 radicals using FAGE : Development and deployment on the field." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10083/document.

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Les radicaux HOx (=OH+HO2) jouent un rôle central dans la dégradation des hydrocarbures dans la troposphère. La réaction d’OH avec les hydrocarbures mène en présence de NOx à la formation de polluants secondaires comme l’ozone. Du fait de sa réactivité élevée, la concentration en OH (&lt;1 ppt) ainsi que son temps de vie (&lt;1 s) sont faibles. Pour valider les modèles de chimie atmosphérique, le développement d’appareils capable de mesurer ces très faibles concentrations est nécessaire. Un appareil basé sur la technique FAGE (Fluorescence Assay by Gas Expansion) a été développé à l’Université
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Awad, Andrew Magdi. "Particulate and gas-phase PCBs and OH-PCBs in Chicago air." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/2038.

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This study extends the work we have previously done by reporting on both gas-phase and particulate phase PCB concentrations in Chicago air as well as giving a first report on airborne OH-PCBs in Chicago. Gas phase PCB concentrations ranged from 43.1 pg/m³ to 2250 pg/m³, with an average concentration of 594 pg/m³ ± 445 pg/m³, and exhibited strong temporal trends. Particulate phase PCBs accounted on average for 4.3% of total PCBs in a sample. OH-PCBs were detected in both the gas and particulate phase and exhibit characteristics of either emission sources or atmospheric reactions depending on th
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Rabat, Hervé. "Utilisation du spectre UV du radical OH dans la métrologie des hautes températures des gaz chauds et des plasmas." Orléans, 2004. http://www.theses.fr/2004ORLE2050.

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La bibliographie présente l’étude du radical OH dans les flammes, puis une méthode de simulation de son spectre UV. La partie expérimentale concerne les études thermiques d’une flamme oxy-acétylénique et d’un panache de plasma d’argon par des méthodes spectroscopiques et interférométriques. Outre la validation de la simulation, elles montrent que la densité de OH tend avec la hauteur dans la flamme vers une répartition radiale gaussienne. Parallèlement, nous montrons que la température rotationnelle de OH reste, pour ces mêmes hauteurs, constante sur le diamètre de la flamme. La dernière parti
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Lengignon, Christophe. "Développement d'un système de mesure de radicaux hydroxyles par spectroscopie d'absorption en cavité résonante hors axe." Phd thesis, Université du Littoral Côte d'Opale, 2012. http://tel.archives-ouvertes.fr/tel-00874400.

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Le radical hydroxyle OH est un oxydant puissant qui intervient, entre autre,dans de nombreux processus photochimiques atmosphériques. L'objectif de cette thèse était de développerun système de mesure desradicaux OH dédié aux études de laboratoire. Celui-ci est basé sur la spectroscopie d'absorption en cavité résonante hors d'axe (OA-ICOS,Off-Axis integrated Cavity Output Spectroscopy).Notre système repose sur le couplaged'une diode laser fibrée (DFB) émettant dans le proche infrarouge (∼1435 nm) au sein d'une cavitéoptique àhaute finesse de 50 cm. Le parcours d'interaction du faisceau avec le
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Books on the topic "Hydroxyl radicals (•OH)"

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S, Zahniser Mark, and Kolb Charles E, eds. Laboratory kinetic studies of OH and CO2 relevant to upper atmospheric radiation balance: First annual report, September 1993 - September 1994. National Aeronautics and Space Administration, 1994.

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Nelson, David D. Laboratory kinetic studies of OH and CO2 relevant to upper atmospheric radiation balance: First annual report, September 1993 - September 1994. National Aeronautics and Space Administration, 1994.

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X, He Z., Samson James A. R, and United States. National Aeronautics and Space Administration., eds. A photoionization study of OH and OD from 680⁰A to 950⁰A: An analysis of the Rydberg series. National Aeronautics and Space Administration, 1995.

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V, Buxton George, American Chemical Society, American Institute of Physics, and National Bureau of Standards, eds. Critical review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (.OH/.O-) in aqueous solution. American Chemical Society, 1988.

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Muk, Hwang Soon, DeWitt Kenneth J, and United States. National Aeronautics and Space Administration., eds. High temperature kinetic study of the reactions H + O₂ = OH + O and O + H₂ = OH + H in H₂/O₂ system by shock tube - laser absorption spectroscopy. National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Adaptation of an in situ ground-based tropospheric OH/HO2 instrument for aircraft use: Summary of research (final report) for the period 1 July 1994 - 30 November 1996, for NASA-Ames grant no. NAG 2-938. National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration., ed. Adaptation of an in situ ground-based tropospheric OH/HO2 instrument for aircraft use: Summary of research (final report) for the period 1 July 1994 - 30 November 1996, for NASA-Ames grant no. NAG 2-938. National Aeronautics and Space Administration, 1997.

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Anderson, James G. Development of techniques for the In Situ observation of OH and HO₂ for studies of the impact of high-altitude supersonic aircraft on the stratosphere: Final technical report, August 1, 1990-July 31, 1993. National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., ed. Development of techniques for the In Situ observation of OH and HO₂ for studies of the impact of high-altitude supersonic aircraft on the stratosphere: Final technical report, August 1, 1990-July 31, 1993. National Aeronautics and Space Administration, 1994.

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OH radicals in the troposphere. S. Hirzel, 1995.

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Book chapters on the topic "Hydroxyl radicals (•OH)"

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Kiran, Tugba Raika, and Aysun Bay Karabulut. "Free Radicals and Antioxidants in Diabetics." In Current Multidisciplinary Approach to Diabetes Mellitus Occurrence Mechanism. Nobel Tip Kitabevleri, 2023. http://dx.doi.org/10.69860/nobel.9786053359104.5.

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In diabetics, there is an imbalance between free radicals and antioxidants, leading to oxidative stress, a condition characterized by increased production of reactive oxygen species (ROS) and impaired antioxidant defenses. Free radicals, such as superoxide anion (O2•−), hydroxyl radical (•OH), and hydrogen peroxide (H2O2), are generated as by-products of normal cellular metabolism and play a role in cell signaling and immune response. However, excessive ROS production in diabetes, exacerbated by hyperglycemia and insulin resistance, overwhelms antioxidant defenses, which include enzymatic anti
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Irvine, William M. "Hydroxyl Radical (OH)." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_1810.

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Tyszkiewicz, E., and E. Roux. "Role of the Superoxide Anion O 2 - and Hydroxyl Radical (OH-) in ATP Synthesis Obtained with Spinach Chloroplasts in Darkness." In Progress in Photosynthesis Research. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-0516-5_45.

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Pehlivan, Melisa. "Biochemistry of Alcohols." In Medicolegal Aspect of Alcohol. Nobel Tip Kitabevleri, 2024. http://dx.doi.org/10.69860/nobel.9786053359487.4.

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Alcohol is a general term used to refer to chemical structures containing the hydroxyl (-OH) radical group. In daily life, it refers to a type of alcohol, usually called ethanol. When alcohol is ingested into the body, a series of chemical effects occur, especially in the liver. The elimination process that begins when alcohol is ingested is usually absorbed through the stomach and small intestine. This absorption process varies depending on the type of alcohol, the type of food and drinks consumed, the physical condition of the person and other factors. Once in the bloodstream, alcohol is dis
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Quinlan, G. J., and J. M. C. Gutteridge. "Hydroxyl radical damage to DNA bases detected by GC-MS." In Experimental protocols for reactive oxygen and nitrogen species. Oxford University PressOxford, 2000. http://dx.doi.org/10.1093/oso/9780198506683.003.0071.

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Abstract DNA bases are readily damaged by -OH radicals, producing patterns that are recognized as highly characteristic of the -OH radical. GC-MS techniques, with selective ion monitoring, have been pioneered by Mirai Dizdaroglu and his colleagues (1, 2).
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Charlier, Michel, and Melanie Spotheim-Maurizot. "Radiolytic cleavage of DNA. Mapping of the protein interaction sites." In DNA-Protein Interactions. Oxford University PressOxford, 2000. http://dx.doi.org/10.1093/oso/9780199636921.003.0013.

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Abstract In aerobic conditions, DNA lesions induced by ionizing radiations such as y-, |3and X-rays result mainly from attack by the oxidative hydroxyl radicals (OH*) arising from the radiolysis of water (see Figure 1). The OH* radicals either abstract H atoms from the deoxyribose moiety, or add to the bases (see Figure 2A).
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Symons, M. C. R., and J. M. C. Gutteridge. "Biological measurements and fingerprints of radical and related damage." In Free Radicals and Iron: Chemistry, Biology, and Medicine. Oxford University PressOxford, 1998. http://dx.doi.org/10.1093/oso/9780198558927.003.0010.

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Abstract The hydroxyl radical is far too reactive to be directly detected in vivo using present methodologies. Consequently, evidence of its biological existence is sought by indirect methods which assess patterns of damage characteristic of the hydroxyl radical. One of the most incriminating ‘calling cards’ the "OH radical leaves behind is its ability to hydroxylate aromatic molecules by the addition reaction (see Chapter 5).
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Calvert, J. G., R. Atkinson, J. A. Kerr, et al. "Summary." In The Mechanisms Of Atmospheric Oxidation Of The Alkenes. Oxford University PressNew York, NY, 2000. http://dx.doi.org/10.1093/oso/9780195131772.003.0010.

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Abstract When alkenes are released into the atmosphere of a city during the day, they react quickly (within hours), largely with hydroxyl radical (OH), and somewhat more slowly with nitrate radical (N03) and ozone (03). When released at night, alkenes react largely with N03 or 03, with lifetimes of the order of days. Alkenes (as well as alkanes and aromatic hydrocarbons) react with OH radicals to form peroxy radicals that initiate chain reactions in which NO is oxidized to N02, N02 is photodissociated [N02 + hv (&amp;gt;-. &amp;lt; 430 nm) —s+ 0(3 P) + NO], and03 is formed from the 0-atoms pro
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Townes, Charles H. "The rains of orion." In How the Laser Happened. Oxford University PressNew York, NY, 1999. http://dx.doi.org/10.1093/oso/9780195122688.003.0009.

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Abstract During a 1963 meeting in Washington, D.C., a group of radio astronomers had dinner at the home of Gart Westerhout, a Dutch scientist then on the faculty of the University of Maryland. Alan Barrett of MIT, one of the guests, soon had the party buzzing over his news. He and colleagues from Lincoln Lab had detected a signal from space carrying the signature of OH, the very reactive, or “free radical” hydroxyl molecule. This was the first molecule discovered by radio astronomy, and only the fourth known in interstellar space (after CN, the cyanide radical, and CH and CH+, methine radicals
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Bunduchi, Elena, and Gheorghe Duca. "Mechanisms and kinetics of chemical self-purification of natural waters, using the theory of redox processes." In Redox Processes with Electron and Proton Transfer. Moldova State University, 2023. http://dx.doi.org/10.59295/prtep2023_12.

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The paper describes the mechanisms of catalytic redox processes that take place in natural waters, essential for chemical self-purification processes. The types of redox mechanisms involving both partial charge transfer compounds, free radicals, and reductants, all found in natural waters, are examined. The focus is on redox processes, catalyzed by ions or complex compounds of transition metals, including copper, iron and manganese. These processes involve the main oxidative agents in natural waters: oxygen (O2), hydrogen peroxide (H2O2) and hydroxyl radicals (•OH).
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Conference papers on the topic "Hydroxyl radicals (•OH)"

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Schweizer, Christian, Matthew Hay, Chad V. Mashuga, and Waruna D. Kulatilaka. "OH-PLIF Diagnostics of Niacin Dust Flames." In Laser Applications to Chemical, Security and Environmental Analysis. Optica Publishing Group, 2024. https://doi.org/10.1364/lacsea.2024.lw3e.5.

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Hydroxyl radical planar laser-induced fluorescence (OH-PLIF) imaging is implemented to characterize the flame structure of burning niacin dust clouds. The flame morphology is analyzed using two-dimensional flame area and curvature measurements.
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Mooney, C. E., L. C. Anderson, and J. H. Lunsford. "Formation and desorption of hydroxyl radicals during Pt-catalyzed oxidation." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thii4.

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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
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Glumac, N. G., and Y. J. Chen. "Laser-Induced Fluorescence Measurements for Hydroxyl Radicals and Temperature in Nanopowder-producing Flames." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lthd.20.

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Laser-induced fluorescence measurements are performed in silica nanopowder-producing low pressure flat flames in a stagnation-point flowfield. Spatial hydroxl concentrations and two-line rotational temperature measurements are obtained for several conditions to asses the effect on the flame of the addition of the silica precursor hexamethyldisilazane (HMDS) and to evaluate the validity of the one-dimensional stagnation-point flow model for these flames. It is observed that, while the HMDS has little effect on the flame temperature profile, the OH concentration is substantially reduced througho
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Elmakki, Tasneem, Fathima Sifani Zavahir, Mona Gulied, Norhan Ismail, Areeba Hameed, and Dong Suk Han. "Advanced Degradation of Organic Substance in Water Using No-Ferric Fenton Reaction on Titania Nanotube." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0028.

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Highly reactive OH radicals facilitate advanced oxidation processes (AOPs). AOPs are irreplaceable in environmental remediation including but not limited to pollutant degradation. H2O2 leading to OH radicals in iron based fenton systems are well known and few other oxides of alumina and ceria in non-ferrous fenton systems. Majority of studied catalysts materials are in powder form, which limits the catalysts long term applicability in real systems due to separation and regeneration of the catalyst with required catalytic activity, which is costly. In this present work, we have studied anatase
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Di Iorio, S., A. Irimescu, S. S. Merola, P. Sementa, and B. M. Vaglieco. "Spectroscopic Investigation of Initial Combustion Stages in a SI Engine Fuelled with Ethanol and Gasoline." In JSAE/SAE Small Engine Technologies Conference & Exhibition. Society of Automotive Engineers of Japan, 2017. http://dx.doi.org/10.4271/2017-32-0092.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;It is well known that ethanol can be used in spark-ignition (SI) engines as a pure fuel or blended with gasoline. High enthalpy of vaporization of alcohols can affect air-fuel mixture formation prior to ignition and may form thicker liquid films around the intake valves, on the cylinder wall and piston crown. These liquid films can result in mixture non-homogeneities inside the combustion chamber and hence strongly influence the cyclic variability of early combustion stages. Starting from these considerations, the paper
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Simić, Marija, Danka Aćimović, Marija Kovačević, et al. "IMPACT OF INITIAL CONCENTRATION OF H2O2 ON BPA DEGRADATION EFFICIENCY BY FENTON REAGENT." In 17th International Conference on Fundamental and Applied Aspects of Physical Chemistry. Society of Physical Chemists of Serbia, 2024. https://doi.org/10.46793/phys.chem24i.077s.

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Due to its widespread use, bisphenol A (BPA) is commonly found as a contaminant in wastewater, posing significant environmental and health risks. Conventional treatment methods often fail to completely remove it, necessitating the development of more effective technologies. Advanced oxidation processes (AOPs), particularly the Fenton reaction, have garnered considerable attention for the degradation of organic pollutants. The Fenton reagent uses hydrogen peroxide (H₂O₂) and ferrous iron (Fe²⁺) to generate hydroxyl radicals (•OH), which are highly reactive and capable of breaking down BPA. This
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Kalitan, Danielle M., Eric L. Petersen, John D. Mertens, and Mark W. Crofton. "Ignition of Lean CO/H2/Air Mixtures at Elevated Pressures." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90488.

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Shock-tube ignition delay time experiments and chemical kinetics model calculations were performed for several fuel blends of carbon monoxide and hydrogen in air at elevated pressures. Due to the interest in coal-derived fuels, namely syngas, these data are important for characterizing the ignition and oxidation of possible fuel blends used in gas turbines and for the validation of chemical kinetics models. Three lean, CO/H2 (80/20%, 90/10%, and 95/5% by volume) fuel blends in air were studied behind reflected shock waves at temperatures between 929 and 1304 K and pressures ranging from 1.7 to
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Caebron, J. Y., M. Joseph, H. Vorng, J. Pincemail, M. Lagaede, and A. Capron. "OXYGEN FREE RADICAL-DEPENDENT STEP IN THE CYTOTOXICITY OF DEC-TREATED PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642819.

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Over the past 35 years, diethylcarbamazine (DEC) has been the most widely used agent for the treatment of filarial diseases. However, in spite of millions of individuals treated, the mode of action of this drug remained unexplained until recently when we reported that the microfilaricidal activity of DEC was mediated by blood platelets with the additional triggering of a filarial excretory antigen (FEA) (Nature, 1987).To set up the mechanism of the larvicidal action of platelets activatedby both DEC and FEA, various inhibitors of the arachidonic acid metabolism were added in the cytotoxic assa
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Lantz, Andreas, Robert Collin, Marcus Aldén, Annika Lindholm, Jenny Larfeldt, and Daniel Lörstad. "Investigation of Hydrogen Enriched Natural Gas Flames in a SGT-700/800 Burner Using OH PLIF and Chemiluminescence Imaging." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26293.

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The effect of hydrogen enrichment to natural gas flames was experimentally investigated at atmospheric pressure conditions using flame chemiluminescence imaging, planar laser-induced fluorescence of hydroxyl radicals (OH PLIF) and dynamic pressure monitoring. The experiments were performed using a 3rd generation dry low emission (DLE) burner used in both SGT-700 and SGT-800 industrial gas turbines from Siemens. The burner was mounted in an atmospheric combustion test rig at Siemens with optical access in the flame region. Four different hydrogen enriched natural gas flames were investigated; 0
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Reichel, Thoralf G., Katharina Goeckeler, and Oliver Paschereit. "Investigation of Lean Premixed Swirl-Stabilized Hydrogen Burner With Axial Air Injection Using OH-PLIF Imaging." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42491.

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In the context of lean premixed combustion, the prevention of upstream flame propagation in the premixing zone, referred to as flashback, is a crucial challenge related to the application of hydrogen as a fuel for gas turbines. The location of flame anchoring and its impact on flashback tendencies in a technically premixed, swirl-stabilized hydrogen burner are investigated experimentally at atmospheric pressure conditions using planar laser-induced fluorescence of hydroxyl radicals (OH-PLIF). The inlet conditions are systematically varied with respect to equivalence ratio (ϕ = 0.2–1.0), bulk a
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Reports on the topic "Hydroxyl radicals (•OH)"

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Peak, J. G., T. Ito, M. J. Peak, and F. T. Robb. DNA damage produced by exposure of supercoiled plasmid DNA to high- and low-LET ionizing radiation: Effects of hydroxyl radical quenchers. DNA breakage, neutrons, OH radicals. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10172487.

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Kim, Saewung. Observations and Modeling of the Green Ocean Amazon 2014/15: Hydroxyl Radical (OH) Chemical Ionization Mass Spectrometer (CIMS) Field Campaign Report. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1254649.

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Sritularak, Boonchoo, Kittisak Likhitwitayawuid, Pithi Chanvorachote, and Varisa Pongrakhananon. Cytotoxic constituents from Dendrobium spp. : Final report. Chulalongkorn University, 2014. https://doi.org/10.58837/chula.res.2014.28.

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The MeOH extracts of Dendrobium pullchellum Roxb. Ex Lind1. And D. ellipsophyllum Tang &amp; wang (Orchidaceae) showed significant cytotoxic activity against human lung cancer cells. Phytochemical study of the whole plant of D. pullchellum Roxb. Ex Lind1 led to the isolation of seven phenolic compounds, namely, chrysotobibenzyl, chrysotoxine, crepidatin, moscatilin, fimbriatone, (-) –shikimic acid and liriodendrin. The whole plant of D. ellipsophyllum Tang &amp; wang yielded ten phenolic compounds indluding moscatilin, 5,7-dihydroxy-chromen-4-one, 4,5-dihydroxy-2,3-dimethoxy-9,10-dihydrophenan
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