Free radicals are produced in cells by cellular metabolism and by exogenous agents. These species react with biomolecules in cells, including DNA. The resulting damage to DNA, which is also called oxidative damage to DNA, is implicated in mutagenesis, carcinogenesis, and aging. Mechanisms of ...
Free radicals are the toxic intermediates in most of the deleterious effects of ionizing radiation (Bacq and Alexander, 1961), some chemical carcinogens (Ts'o, 1974), and sunlight (Blum, 1974). Free radicals cause biological damage, generally by oxidative processes. This is the case in ...
Free-radicals are generated by collapsing microbubbles in aqueous solutions;however,the concentration is too low to be of practical use.In this study,copper was found to enhance the generation of hydroxyl radicals from collapsing oxygen microbubbles under acidic conditions through electron-spin-resonance ...
The meaning of FREE RADICAL is an especially reactive atom or group of atoms that has one or more unpaired electrons; especially : one that is produced in the body by natural biological processes or introduced from an outside source (such as tobacco smok
Oxygen-free radicals have been implicated as causative factors in ischaemic and traumatic processes. Oxygen-free radical scavengers can be used potentially to treat brain oedema. We investigated the effects of superoxide dismutase and dimethylthiourea on brain oedema. Vasogenic brain oedema was produced ...
Both the irradiations...关键词: n20310* --chemistry--radiation & nuclear chemistry-- radiation effects acetic acid-- acetyl radicals-- amino acids-- valine amino acids-- threonine amino acids-- valine argon compounds carbon compounds cations crystals cysteine electron beams ...
Upon soil drainage, the oxidation of FeS produced considerable amounts of hydroxyl free radicals (OH ), which could oxidize CdS directly and thereby promote the oxidative dissolution of CdS and increase Cd mobilization in soils. FeS and CdS could also form a within-sulfide voltaic cell, with ...
A. They are a partial cause of certain diseases. B. They escape into the atmosphere when we breathe. C. They are present in two vitamins. D. They are produced by our bodies. 相关知识点: 试题来源: 解析 A 第二段第二句提到自由基和多种疾病有关(be implicated in diseases),其中的implicat...
termination. More specifically, in the phase of initiation, radicals are produced by vinyl monomer, which involves radical reactions wherein the production of radicals undergoes rapidly in the form of a developed chain of polymers. Notably, no change in the active center is observed, typically ...
Free radicals are usually highly reactive and unstable. They are produced by homolytic cleavage of a covalent bond (see chemical bond); i.e., each of the atoms connected by the bond retains one of the two electrons making up the bond. The homolytic cleavage of a hydrogen molecule, H2, pr...