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Showing 1 to 20 of 106 for “"hydroxyl radicals"”.
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Potential of Ozone and Hydroxyl Radicals to Degrade Emerging Organic Contaminants
… intensive.</p> <p>Previous research on ozone and hydroxyl radicals leads to the conclusion that they might be a vial option for advanced water treatment processes. To test the effects of ozone and hydroxyl radicals on the destruction of algae, ozonated phosphate buffer was mixed with Anabaena and …
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Spectroscopy and Photo-induced Chemistry of Atmospherically Significant Criegee Intermediates and Hydroxyl Radicals
… enhanced multiphoton ionization detection of hydroxyl (OH) radicals via the A2Σ+ state. The intensities of OH A-X (1,0) transitions detected by ionization have been compared with those obtained by laser-induced fluorescence (LIF) to calibrate the new method for state-selective detection of OH …
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The regulation of hypoxia-responsive gene expression by hydroxyl radicals and intracellular calcium
… Antwort erlaubt. Es wird angenommen, dass Hydroxylradikale (OH·), welche in der Fenton-Reaktion entstehen als Boten" am O2-Signaltransduktionweg" beteiligt sing. Die Fenton-Reaktion konnte durch den Gebrauch von nicht-fluoreszierendem Dihydrorhodamin (DHR) lokalisiert werden, das durch die …
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Preparation, Characterization, And Application of Liposomes in the Study of Lipid Oxidation Targeting Hydroxyl Radicals
… many reactive oxygen species (ROS) including hydroxyl radicals, are generated. Hydroxyl radicals formed in close proximity to DNA, nucleotides, proteins, and lipids rapidly oxidize these biological molecules in a nonspecific way. However, their toxicity is limited by their short lifetimes. …
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Hydrogen peroxide mediated oxidation of ferrous iron and associated production of hydroxyl radicals in natural aquatic systems
… interest due to the potential formation of hydroxyl radical, HO , a powerful oxidizing agent, during this process. The impact of natural organic matter (NOM) upon the H2O2-mediated oxidation of Fe(II) has been explored under both circumneutral freshwater and seawater conditions, with …
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Comparison of Two Advanced Oxidation Processes for Their Production of Hydroxyl Radicals and Evaluation of a UV/Ozone AOP at Varying UV Fluence for Treating Diclofenac
… advanced oxidation processes for generation of hydroxyl radicals to promote degradation of emerging contaminants. Drought and water shortage have become pressing issues caused by our world’s changing climate. Water reclamation and reuse are increasingly important options for relieving this water …
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Effects of different frequencies and other variables on the salicylic acid and terephthalic acid dosimeters applied to the advanced Fenton process and activated carbon cloth
… Processes (AOPs) depend on the production of hydroxyl radicals for the destruction of organic pollutants. The effectiveness of six high ultrasound frequencies (378 kHz, 583 kHz, 862 kHz, 995 kHz, 1144 kHz, and 1175 kHz) and one low ultrasound frequency (20 kHz) for the production of hydroxyl …
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Experimental and theoretical examination of the chemical kinetics of a pollutant coating on porous particles
… degradation of airborne substances through hydroxyl radicals. The smog-chamber was cooled on 2 and -10°C and the degradation kinetic of semivolatile substance (Aldrin) coated on fine quartz particles (Aerosil 380) was researched. The coated Aerosil was mixed with water in ration 1:1000 and …
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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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TWO TYPES OF ROS ARE DIFFERENTIALLY INVOLVED IN SPINAL SYNAPTIC PLASTICITY AND MECHANICAL HYPERSENSITIVITY IN NEUROPATHIC PAIN
… the role of two types of ROS (superoxide and hydroxyl radicals) in pain behavior as well as in CS-induced STTn and GABAn synaptic plasticity was investigated. The role of superoxide and hydroxyl radicals was also investigated in spinal nerve ligation (SNL)-induced synaptic plasticity. Results …
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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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Nanotechnology based therapeutic approaches to iron‐induced oxidative stress in an in vitro model of Parkinson’s disease
… free iron drives the accumulation of toxic hydroxyl radicals within mitochondria of dopaminergic neurons, resulting in sustained oxidative stress and cellular damage. The blood‐brain barrier (BBB) prevents most pharmaceuticals from entering the brain, therefore, to enable the advancement of …
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Treatment of oil-water emulsion from the machinery industry by Fenton's reagent
… increased rapidly due to a higher generation of hydroxyl radicals. However, this effect becomes less significant as the dosage of H 2 O 2 increases. This effect might be attributed to the consumption of hydroxyl radicals with excess H 2 O 2 . The coagulation function of Fenton's reagent was …
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Antimicrobial Materials for Water Disinfection Based on Visible-Light Photocatalysts
… of oxidative damages, and indicated that hydroxyl radicals are one of the key killing species. Atomic force microscopy and electron microscopy showed that the cell walls were attacked by photocatalytic inactivation. The potential application of the photocatalyst in water disinfection was …
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Complexation of Organic Guests and Coordination of Metal Ions by Cyclodextrins: Role of Cyclodextrins in Metal-Guest Interactions
… chemistry (ferrous ion catalyzed generation of hydroxyl radicals) has shown utility in the remediation of TNT in soils but it suffers from non-specificity and the need for acidic conditions to prevent loss of iron as iron hydroxides. Cyclodextrins (CDs) have demonstrated the ability to increase …
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Porphyrin metabolism in congenital erythropoietic porphyria
… I in the presence of H202 and iron while the hydroxylated uroporphyrin I derivatives are most probably produced by hydroxyl radicals generated during the formation of peroxyacetic acid uroporphyrin I. Destruction of porphyrins is found in the same reaction and can be prevented …
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Photochemistry of single-walled carbon nanotubes in the aquatic environment, and their extraction from soils
… photo-transformation through reactions with hydroxyl radicals (produced from hydrogen peroxide), even in the absence of surfactants, which are often added to disperse the unfunctionalized tubes in water. Evidence for transformation includes UV-VIS and Near Infrared Fluorescence (NIRF) fading, …
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A high-performance liquid chromatography system with Fenton's reagent for detection of gas-phase hydrogen peroxide
… and ferrous iron) under the proper conditions. Hydroxyl radicals generated from Fenton's reagent will react with sodium salicylate and generate 2,3-, 2,4-, and 2,5-dihydroxybenzoic acid (sodium salts), which can be quantitatively determined by HPLC-UV at wavelength 310 nm. The cryogenic sampling …
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Aqueous Atmospheric Species, a Dual Study: 1. Comparison of the Effects of Temperature, Oxygen Level, Ionic Strength, and pH on the Reaction of Benzene with Hydroxyl Radicals at the Air-water Interface to the Bulk Aqueous Phase. 2. Determination of Carbonyl Compounds in Fog Water Samples via Online Concentration and HPLC
… a common primary atmospheric pollutant, with the hydroxyl radical, was studied in both a bulk-phase reactor and a thin film flow-tube reactor as a laboratory study. For both reactor systems, temperature, pH, ionic strength, and the concentration of oxygen were varied to simulate fog event …
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