free radical

英 [ˌfriː ˈrædɪkl]

美 [ˌfriː ˈrædɪkl]

n.  自由基; 游离基

医学化学

牛津词典

noun

• 自由基；游离基
  an atom or group of atoms that has an electron that is not part of a pair, causing it to take part easily in chemical reactions. Free radicals in the body are thought to be one of the causes of diseases such as cancer.

柯林斯词典

• 自由基;游离基
  Free radicalsare atoms that contain one or more unpaired electrons. Free radicals are believed to be a cause of ageing, heart disease, and some cancers.

英英释义

noun

• an atom or group of atoms with at least one unpaired electron
  1. in the body free radicals are high-energy particles that ricochet wildly and damage cells
  Synonym:radical

双语例句

• They are large molecules that are able to maintain stability even if they are in a free radical form.
  抗氧化剂是很大的分子团，即使是在自由基的状态下它们仍能保持稳定。
• OBJECTIVE: To study the effects of anaerobic interval training on free radical metabolism in rats.
  目的：观察无氧间歇训练对大鼠体内自由基代谢的影响。
• The paper reviewed the modification of chitosan by free radical polymerization and atom transfer radical polymerization ( ATRP), emphasized the application of ATRP on graft copolymerization of chitosan.
  综述了普通自由基聚合和原子转移自由基聚合（ATRP）反应对壳聚糖及其衍生物进行修饰改性的研究现状。着重介绍了ATRP技术在壳聚糖接枝改性方面的应用。
• Antioxidants are also called free radical scavengers.
  抗氧化剂也被称为自由基的清道夫。
• Status of free radical and water in ultradried seeds with distinct moisture content were investigated in safflower seed.
  研究了不同超干度的红花种子自由基和水分状态。
• We studied the effect of scavenging hydroxyl free radical by Se-polysaccharide and Se-protein under the best condition of Fenton system.
  结果表明：硒多糖和硒蛋白清除羟自由基的效果比与之相同浓度的无机硒和相同浓度的多糖及蛋白都要明显；
• The majority of vinyl monomers can be used for free radical polymerization catalyst.
  乙烯基类单体大多数可以采用游离基型催化剂进行聚合。
• Abstract: A water dispersed SBS grafted polymer was synthesized by free radical polymerization.
  文摘：采用自由基接枝共聚的方法合成了亲水性SBS接枝丙烯酸共聚物，同时进行了结构表征。
• The role of oxygen free radical in experimental keratitis a minute hairlike projection on mucous membrane.
  氧自由基在实验性角膜炎中的作用黏膜上起保护作用的细小的毛。
• Copper-containing enzymes play important roles in iron and catecholamine metabolism, free radical scavenging, and in the synthesis of hemoglobin, elastin and collagen.
  含铜的酶在铁和儿茶酚胺的代谢、自由基清除、合成血红蛋白、弹性蛋白和胶原蛋白中发挥重要作用。