A fairly pure preparation can be obtained through two runs of low-speed centrifugation and a single run of high-speed centrifugation in sucrose gradient.
主要是经过两次低速离心，一次蔗糖梯度超速离心，即可得到一定纯度的细胞膜。
The preparation of pure pyridinium dichromate is described.
三氧化铬与吡啶反应制备吡啶重铬酸盐。
Objective To detect the quality of pure water used in hospital's preparation in order to possess the eligible quality.
目的对医院制剂生产中所用的纯化水进行质量监测，确保生产用水质量合格。
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