Free radical reaction products and antioxidant capacity in beating heart coronary artery surgery compared to conventional bypass

2011 ◽  
Vol 76 (6) ◽  
pp. 677-685 ◽  
Author(s):  
A. Gonenc ◽  
A. Hacışevki ◽  
H. R. Griffiths ◽  
M. Torun ◽  
B. Bakkaloglu ◽  
...  
Keyword(s):  
Free Radical ◽  
Coronary Artery ◽  
Antioxidant Capacity ◽  
Radical Reaction ◽  
Beating Heart ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Coronary Artery Surgery

scholarly journals Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

2019 ◽  
Author(s):  
Brian Pinkard ◽  
John Kramlich ◽  
Igor V. Novosselov
Keyword(s):  
Free Radical ◽  
Supercritical Water ◽  
Reaction Mechanisms ◽  
Radical Reaction ◽  
Water Environment ◽  
Waste To Energy ◽  
Reaction Pathways ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Primary Alcohols

<div> <p></p><p>Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. <i>In situ</i> Raman spectroscopy is used to rapidly identify and quantify reaction products. The results suggest the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. The presence of a catalytic surface is proposed to be highly significant for initiating radical reactions. Global reaction pathways are proposed, and mechanisms for free radical reaction initiation, propagation, and termination are discussed in light of these and previously published experimental results.</p><br><p></p></div>

scholarly journals Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

2019 ◽  
Author(s):  
Brian Pinkard ◽  
John Kramlich ◽  
Igor V. Novosselov
Keyword(s):  
Free Radical ◽  
Supercritical Water ◽  
Reaction Mechanisms ◽  
Radical Reaction ◽  
Water Environment ◽  
Waste To Energy ◽  
Reaction Pathways ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Primary Alcohols

<div> <p></p><p>Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. <i>In situ</i> Raman spectroscopy is used to rapidly identify and quantify reaction products. The results suggest the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. The presence of a catalytic surface is proposed to be highly significant for initiating radical reactions. Global reaction pathways are proposed, and mechanisms for free radical reaction initiation, propagation, and termination are discussed in light of these and previously published experimental results.</p><br><p></p></div>

Nitrogen Radicals from Thermal and Photochemical Decomposition of Ammonium Perchlorate, Ammonium Dinitramide, and Cyclic Nitramines

1992 ◽  
Vol 296 ◽  
Author(s):  
M. D. Pace
Keyword(s):  
Free Radical ◽  
Ammonium Perchlorate ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Ammonium Dinitramide ◽  
Reaction Products ◽  
First Order Kinetics ◽  
Photochemical Decomposition ◽  
Nitrogen Radicals ◽  
Cyclic Nitramines

AbstractFree-radical thermal and photochemical decomposition products of ammonium dinitramide (ADN), an acyclic nitramine, are compared to that of cyclic nitramines (RDX, HMX, and HNIW) and to ammonium perchlorate (AP). Photochemical formation of NO2 from uvphotolysis of ADN at 77 K is found to follow first-order kinetics; whereas, zero-order NO2 formation is observed from the cyclic nitramines under the conditions of this experiment. Mechanisms are suggested for ADN decomposition. A general trend of cyclic nitramines to thermally decompose forming nitroxide radicals is supported by 15N-ring-labeled HNIW results. ADN thermally decomposes at 19° C to form free-radical reaction products in solution with tetrahydrothiophene-1,1-dioxide.

scholarly journals Free-Radical Oxidation (Peroxidation) Products in Plasma in Normal and Abnormal Pregnancy

1981 ◽  
Vol 18 (3) ◽  
pp. 158-162 ◽  
Author(s):  
D Wickens ◽  
M H Wilkins ◽  
J Lunec ◽  
G Ball ◽  
T L Dormandy
Keyword(s):  
Blood Pressure ◽  
Free Radical ◽  
Radical Reaction ◽  
Free Radical Oxidation ◽  
Oxidation Products ◽  
Control Group ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Third Trimester ◽  
Radical Oxidation

Using recently developed methods for measuring free-radical oxidation products in biological material, plasma extracts were studied in 24 women in the first two trimesters of pregnancy, in 124 women in the third trimester of pregnancy, in 20 women with pre-eclamptic toxaemia (PET), and in a control group. There was a significant progressive rise of two groups of free-radical oxidation products throughout pregnancy and a significantly greater rise in PET. In women whose diastolic blood pressure rose to above 70 mmHg there was a highly significant relation between two groups of free-radical reaction products and blood pressure.

Free Radical Reaction Products in Diabetes Mellitus: Relationship to Microangiopathy

1985 ◽  
Vol 69 (s12) ◽  
pp. 44P-44P
Author(s):  
A.F. Jones ◽  
P.E. Jennings ◽  
J. Lunec ◽  
A.H. Barnett
Keyword(s):  
Diabetes Mellitus ◽  
Free Radical ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Reaction Products

Free Radical Reaction Products during Haemodialysis: Effect of Membrane Biocompatibility and Heparin

1987 ◽  
Vol 72 (s16) ◽  
pp. 44P-44P
Author(s):  
E.R. Maher ◽  
D.G. Wickens ◽  
J.F.A. Griffin ◽  
P. Kyle ◽  
J.R. Curtis ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Reaction Products
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