The chief sources for the Greek mathematical works are Byzantine Greek codices.希腊的数学著作主要取材于拜占庭的希腊文手抄本.Much of what we know about Leonardo's scientific ideas comes from his codices.我们所知有关里奥那多的科学想法大多来自于他的手抄本....
最后DNA连接酶将新合成的DNA链与原来的链接上.Finally, DNA ligase newly synthesized DNA chain and the original links.方法载体的构建采用限制性内切酶酶切、4DNA连接酶连接等方法.Methods: The restriction endonuclease and T 4 DNA ligase were used to construct the vector pl...
人们对农业上灭草剂和杀虫剂的用量非常担忧.There is a lot of concern over the amount of herbicides and pesticides used in farming.尽管此方法涉及使用灭草剂的化学药品来去除这些已存的青草.Still another involves using an herbicide chemical to kill the existing grass....