نتایج جستجو برای: peroxy radical
تعداد نتایج: 91819 فیلتر نتایج به سال:
Chamber experiments may over emphasize peroxy radical cross reactions due to lower concentrations of reactants that directly convert OH into HO 2 .
1. The metabolic activation of carbon tetrachloride to free-radical intermediates is an important step in the sequence of disturbances leading to the acute liver injury produced by this toxic agent. Electron-spin-resonance (e.s.r.) spin-trapping techniques were used to characterize the free-radical species involved. 2. Spin trapping was applied to the activation of carbon tetrachloride by liver...
Peroxy radical reactions (RO2 + RO2) from the NO3-initiated oxidation of isoprene are studied with both gas chromatography and a chemical ionization mass spectrometry technique that allows for more specific speciation of products than in previous studies of this system. We find high nitrate yields (∼ 80 %), consistent with other studies. We further see evidence of significant hydroxyl radical (...
Peroxy radical chemistry and the control of ozone photochemistry at Mace Head, Ireland during the summer of 2002 Z. L. Fleming, P. S. Monks, A. R. Rickard, D. E. Heard, W. J. Bloss, P. W. Seakins, T. J. Still, R. Sommariva, M. J. Pilling, R. Morgan, T. J. Green, N. Brough, G. P. Mills, S. A. Penkett, A. C. Lewis, J. D. Lee, A. Saiz-Lopez, and J. M. C. Plane Department of Chemistry, University o...
BACKGROUND The in vivo radical-scavenging activity of curcumin (CUR) and THC (tetrahydrocurcumin, a metabolite of CUR) does not occur in isolation, but through an intricate antioxidant network together with co-antioxidants such as glutathiones (GSH). In the present investigation, the radical-scavenging activity of CUR and THC with 2-mercapto-1-methylimidazole (MMI, a thiol) was studied using th...
The cytotoxicity, ROS (reactive oxygen species)-generation activity and radical-scavenging activity of curcumin and related compounds such as eugenol, eugenol orthodimer (bis-eugenol; 3,3'-dimethoxy-5,5'-di-2-propenyl-1,1'-biphenyl-2,2'-diol) and isoeugenol were investigated. Their cytotoxicity against a human submandibular gland adenocarcinoma cell line (HSG) declined in the order curcumin > i...
Recent spectroscopic and computational work on organic peroxy radicals, RO(2), is reviewed and extended with an emphasis on radicals where R is an alkyl group. Detailed experimental spectral, structural relationships are developed and show the dependence of spectral properties on the number of carbon atoms in the radical, and its isomeric and conformeric structure. These empirical relationships...
Measurements of OH, HO2, RO2i (alkene and aromatic related RO2) and total RO2 radicals taken during the ClearfLo campaign in central London in the summer of 2012 are presented. A photostationary steady-state calculation of OH which considered measured OH reactivity as the OH sink term and the measured OH sources (of which HO2+NO reaction and HONO photolysis dominated) compared well with the obs...
A comprehensive product study, performed via the turbulent flow chemical ionization mass spectrometry (TF-CIMS) technique, of the primary OH-initiated oxidation of many of the atmospherically abundant aromatic compounds was performed. The bicyclic peroxy radical intermediate, a key proposed intermediate species in the Master Chemical Mechanism (MCM) for the atmospheric oxidation of aromatics, w...
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