منابع مشابه
Free radicals in chemistry, biology and medicine: contribution of radiation chemistry
Free radical chemistry is one of the topics to which radiation chemistry has made many important and essential contributions. Research on these usually shortlived transients has been particularly enhanced since the development of time-resolved techniques such as pulse radiolysis (in radiation chemistry) [34, 64] and laser flash photolysis (in photochemistry) [11], which allowed direct observati...
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due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...
15 صفحه اولThe Simplest Free Radicals
INTRODUCTION Every lexicographer knows that the meaning of a word is time dependent, and, in favour of the argument that it is also dependent on latitude and longitude, the perverse amonst us would cite Oscar Wilde's dictum, "England and America are two countries separated by a common language". Certainly the word radical has changed its meaning for chemits who originally thought of it as part ...
متن کاملInvestigation of the production of free radicals in ultraviolet irradiation using SnO2:Eu nanoparticles
In studying the ultraviolet (UV) radiation, one of the important factors is the possibility of generating a variety of free radicals inside the body by these radiations. In this paper, a method of estimating the amount of hydroxyl radicals produced by ultraviolet rays was investigated using nanoparticles of tin oxide doped with uropium. In this method, the change in absorption intensity of meth...
متن کاملAntioxidant activity of fullerene C60 against OH free radicals: A quantum chemistry and computational kinetics study
In this work, we have studied the antioxidant activity of fullerene C60 towards OH free radicals, using quantum chemistry and computational kinetics methods. Energy profiles are calculated using different basis sets, and reaction rate constants are reported for the first time. The reaction rate constant for the addition of the OH radical to the fullerene C60 is reported for the first time. A va...
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ژورنال
عنوان ژورنال: Nature
سال: 1948
ISSN: 0028-0836,1476-4687
DOI: 10.1038/162390a0