小钢珠
- 网络pachinko
小钢珠-
在改进的DNA提取方法中，无需使用液氮，而将幼苗叶片放在真空冷冻干燥仪冷冻干燥2-3天，每个试管里盛放一小钢珠球，使用研磨仪粉碎叶片组织。
In the procedure of improved DNA extraction method , the tissue of seedling leave were frozen and dried for 2-3 days in the vacuum freezing machine , then , was ground instead of using liquid nitrogen . There is one small steel ball in each tube .