将腮腺炎病毒S79株培养液用中空纤维超滤器进行浓缩，经PEG沉淀后，采用蔗糖密度梯度离心法纯化抗原；
The tissue culture of mumps virus S79 strain was purified by ultrafiltration on hollow fiber, PEG precipitation and density gradient ultracentrifugation.
取样完成后，迅速通过离心、快速密闭过滤措施，实现灰与水的分离，从而终止体系中所发生的沉淀反应，制取清水样品供测试。
After sampling, the separation between coal ash and water is implemented by the measures of rapid centrifugation and vacuum filtration, in order to prepare the specimen for testing.
经离心后的沉淀物及低温真空抽湿干燥后的结晶体作为垃圾物另行处理。
A centrifugated deposit and a dried crystal of which the humidity is taken out at low temperature and in vacuum are used as garbage to be separately treated.
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