| 词汇 | free-radical |
| 释义 | free radical noun[ Coften plural ] chemistry specializeduk /ˌfriː ˈræd.ɪ.kəl/ us /ˌfriː ˈræd.ɪ.kəl/ a molecule that has an extra electron and therefore reacts very easily with other molecules: 自由基，游离基 Free radicals have been implicated in cancer and many other serious diseases.游离基是罹患癌症和许多其他严重疾病的潜在原因之一。 Physics: atoms, molecules & sub-atomic particles acceptor alpha particle anti-radical antilepton antimatter antineutrino benzene ring beta decay beta particle hadron Higgs boson interatomic interelectronic interionic molecularly monatomic multi-molecular multiparticle muon positron Examples of free radicalfree radical A freeradical is a molecule with an unpaired electron. Indirect evidence of increased freeradical activity (oxidative stress) may be obtained by measurement of antioxidant concentrations in all tissue and body fluids. And finally a reperfusion injury characterized by freeradical formation and oxidative stress. Thus, desiccation sensitivity may result from an inadequate provision of freeradical scavenging mechanisms. When a freeradical reacts with a non-radical molecule a new radical is created, and consequently chain reactions are often initiated. Freeradical scavengers ameliorate the 2-cell block in mouse embryo culture. The presence of the freeradical scavenging enzymes in parasitic organisms has been linked with immunomodulation. They are known freeradical scavengers and metal chelators. The freeradical theory of aging : a critique. During the hydrolysis again a freeradical mechanism should be advocated for the reaction. During rehydration, superoxide dismutase and glutathione reductase activities increased markedly, possibly affording freeradical protection until full hydration and metabolic recovery had occurred. Possibly this is as a result of freeradical formation. Freeradical activity following contraction-induced injury to the extensor digitorum longus muscles of rats. Ageing: a theory based on freeradical and radiation chemistry. By a feedback mechanism on presynaptic auto-receptors, they reduce dopamine turnover and associated freeradical production. See all examples of free radical These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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