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结合本人及学生的实验观察,生物新教材第二册《DNA粗提取与鉴定》实验成功率较低。但是只要把握实验中的关键性步骤,便能大大地提高实验的成功率。一、鸡血的制备1.鸡血的采集实验中要求用鸡血,因为需要量较大,每个班需要6-8只活鸡,使实验费用猛增。我们采用较经济的办法,预先配制好0.1g/mL的柠檬酸钠溶液若干,放入一只小
Combined with the experimental observation of myself and students, the experimental success rate of the second volume of the Biological New Textbook “DNA rough extraction and identification” is low. However, as long as the key steps in the experiment are grasped, the success rate of the experiment can be greatly improved. First, the preparation of chicken blood 1. The collection of chicken blood in the experiment requires the use of chicken blood, because the larger the amount required, each class needs 6-8 live chickens, so that the experimental costs soared. We use a more economical method to pre-prepare 0.1g/mL sodium citrate solution into a small