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free radical
free radical
The Oxford Pocket Dictionary of Current English
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2009
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© The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information)
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free rad·i·cal
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n. Chem.
an uncharged molecule (typically highly reactive and short-lived) having an unpaired valence electron.
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Radical-mediated cyclization reactions leading to spiro and [6,6]-fused heterocycles.
Magazine article from: Canadian Journal of Chemistry; 6/1/2007; ; 700+ words
; ...SnH-AIBN-mediated aryl-radical cyclization of different 3...Redaction] Introduction Recently, free-radical cyclizations have...preparation of sulfur heterocycles by free-radical pathways, which include...benzothiopyran heterocycles by free-radical methodology, employing...
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Radical spin doctors.(Review)
Magazine article from: Chemistry and Industry; 6/26/2000; ; 700+ words
; ...been written with free radicals in mind. Exactly...multiplication of radical ideas and radical...1950s and 1960s. Free radicals flourish in the...prevention, to free radical chemists. Perhaps...The chemistry of free radicals' series, which...basic methods ...
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Radical Cation Generation from Singlet and Triplet Excited States of All-trans-Lycopene in Chloroform¶
Magazine article from: Photochemistry and Photobiology; 9/1/2004; ; 700+ words
; ...reaction with a solvent radical leading to the formation of carotenoid radical cations. The reverse ordering...carotenoids to generate radical cations is discussed in...carotenoids as scavengers of free radicals. Abbreviations: CW, continous...
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Radical dangers up in smoke. (research on free radicals and fire)
Magazine article from: Science News; 9/12/1987; ; 700+ words
; Radical dangers up in smoke...s fire--and free radicals. These electron...while tobacco-smoke free radicals are formed within seconds, the free radicals that they detected...decomposes into a free radical. This would mean...
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Lignin Radicals in the Plant Cell Wall Probed by Kerr-Gated Resonance Raman Spectroscopy
Magazine article from: Biophysical Journal; 4/15/2006; ; 700+ words
; ...biosynthesis, lignin monomer radicals add to a growing lignin polymer...which itself contains reactive radical sites (6,7). The biodegradation of lignin also involves free radical mechanisms (8-10). Despite their importance lignin radicals are today sparsely explored...
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Free radical pathway to geometrical trans lipids
Magazine article from: International News on Fats, Oils and Related Materials : INFORM; 7/1/2006; ; 700+ words
; ...biologically relevant free radicals were found to be able...process linked to a radical stress directly occurring...elimination of thiyl radicals to the double bond...in particular thiyl radicals) are the most effective...of the desired thiyl radical precursors (see "information...
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Free radical-scavenging activity of Taiwanese native plants.
Magazine article from: Phytomedicine: International Journal of Phytotherapy & Phytopharmacology; 3/1/2003; ; 700+ words
; ...hydroxyl (*OH) radicals, and reducing power...activity against DPPH radicals, and their I[C...DPPH), hydroxyl radical (*OH), reducing...Introduction Reactive oxygen free radical species (ROS...involves a series of free radical chain reaction processes...diseases induced by ...
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Fitness and free radicals. (using antioxidants and lower-intensity exercise to combat free radicals in the body)
Newspaper article from: Medical Update; 9/1/1994; 700+ words
; ...account exposure to free radical 'triggers' such...carotene for fighting free radicals, but Dr. Cooper...defenses against free radicals--including natural...solution to the free radical problem is The...defenses against free radicals...." Here...
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Heterocycle synthesis via radical reactions *.(Report)
Magazine article from: Pure and Applied Chemistry; 4/1/2008; ; 700+ words
; ...martinellic acid. Keywords: radical reaction; oxime ethers...martinellic acid. INTRODUCTION Free-radical cyclization reactions are...We have developed efficient radical addition/cyclization reactions...on sulfanyl [2] or alkyl radicals [3] for the preparation...
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Free radicals and antioxidants in cardiovascular health and disease.(Clinical Knowledge)
Magazine article from: Internet Journal of Medical Update; 7/1/2006; ; 700+ words
; ...molecular orbital. Free radicals are formed...collision of the non radical species by a reaction...reactions (3,4,5). Radicals are generally less stable...sub.3]) are not free radicals but can easily lead to free radical reactions in living...includes not only the ...
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Radical (Atomic)
Encyclopedia entry from: The Gale Encyclopedia of Science
Radical (Atomic) A radical is an uncharged atom...unpaired, or “ free, ” electron. Radicals are formed when a covalent...ray exposure. The free radical process involves...propagation in which the radicals react with other molecules...other to form non-radical ...
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Radical Republicans
Dictionary entry from: Dictionary of American History
RADICAL REPUBLICANS RADICAL REPUBLICANS. The Radical Republicans were a wing of the...a small group of antislavery radicals in Congress (including Salmon...antislavery advocates from the Free Soil and Democratic Parties and...
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free radical
Book article from: The Columbia Encyclopedia, Sixth Edition
free radical in chemistry, a...negatively charged. Free radicals are usually highly...two hydrogen free radicals (hydrogen atoms...two chlorine free radicals can be produced from...produce a methyl free radical and a bromine free...
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radical
Book article from: The Columbia Encyclopedia, Sixth Edition
radical in chemistry, group of atoms...unit. Important inorganic radicals include ammonium, NH 4...SO 4 . The use of these radicals simplifies the naming and...organic chemistry, the term radical is sometimes used synonymously...easily could be taken to mean a free radical , the term ...
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free radicals
Book article from: The Oxford Companion to the Body
free radicals A free radical is any chemical species which contains...The biologically important free radicals are the oxygen species, superoxide O • 2 - , the hydroxyl radical OH • , and the reactive...
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