这些包括维生素a、C、E和硒、胡萝卜素、叶酸在内的混合物是抗自由基的，人们认为不稳定的自由基会伤害细胞并且导致人衰老。
These compounds, which include vitamins a, c, and e, selenium, beta carotene, and folate, fight free radicals, unstable compounds thought to damage cells and contribute to aging.
运用电子自旋共振（ESR）技术直接观察了两种硒的化合物对过氧自由基的清除作用。
The scavenging effect of selenium on peroxy radical was directly investigated with two kinds of selenium compound by means of electron spin resonance (ESR) technique.
本文着重从硒的化学，自由基与抗氧化系统，硒蛋白，与凋亡、癌症以及生殖系统的关系等几个方面对硒的研究加以综述。
Chemistry of Selenium, free radical and antioxidant system, selenoproteins, and its interaction with apoptosis, cancer and reproductive system were mainly reviewed in this paper.
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