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在去年《生物学通报》第4期上曾经介绍了一些有关遗传密码的知识和现状,其中关于20种氨基酸的具体遗传密码问题主要是介绍1961年下半年和1962年上半年的研究成果。由于对这个问题集中进行研究的结果,在1962年之后,在这个问题上又取得了许多新的进展,并对过去的结果作了一些修改。首先由于试验方法的改进,用钨酸来部分代替以前用来作为沉淀剂的三氯醋酸,结果发现许多不含尿
In the last issue of Biology Bulletin No. 4, some knowledge and current status of genetic code were introduced. The specific genetic code of 20 kinds of amino acids was mainly introduced in the second half of 1961 and the first half of 1962. As a result of intensive research on this issue, many new developments have been made on this issue since 1962, with some changes in the past results. First, due to the improvement of the test method, tungstic acid was used in place of the trichloroacetic acid previously used as a precipitating agent, and as a result, a lot of urine containing no urine