用红外光谱法对不同温度下处理的酚醛和聚苯乙烯阳离子交换树脂碳化产物的结构基团进行了测试分析。

The structural groups of carbonized products of phenolic aldehyde resin and polystyrene cation exchange resin treated at different temperatures are tested and analyzed with IR method.

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同时，上海的研究人员在1973到1975年间着手解析青蒿素的化学结构，他们发现青蒿素具有一个全新且罕见的过氧基团结构。

Meanwhile, researchers working in Shanghai from 1973 to 1975 found that artemisinin has a novel and unusual structure, a so-called peroxide bridge.

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20种不同的有机分子结合起来组成多肽链或蛋白质。这20个氨基酸主结构相同，但每种又分别有各自不同的侧基团。

One of the 20 different organic molecules that are joined together to form a polypeptide chain or a protein the twenty amino acids share a common backbone, but each has a specific side-group.

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Well, imagine if that change in structure could be switched on and off by addition of a phosphorous; and in fact it can in many proteins.

那么,想象一下,只需引入磷酸基团,就能导致蛋白质的结构发生变化,事实上很多蛋白质就是如此

耶鲁公开课 - 生物医学工程探索课程节选

So my goal today is to talk about sort of the basics of the molecules, their chemistry, the function of DNA in cells, sort of basic - the basic side of that.

所以我今天的任务是告诉你们,DNA分子的各种基团,它们的化学结构,细胞内DNA分子的功能

耶鲁公开课 - 生物医学工程探索课程节选