The purification methods of phosphine include adsorption method, low temperature distillation method and membrane separation method etc.

总结了磷化氢的精制方法，主要有吸附法、低温精馏法和膜分离法等。

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Conclusion: The improved methods of manual purification, cool digestion and dermal scratching may increase the human keratinocyte livability and growth speed.

结论：采用人工纯化法、冷消化法和真皮刮除法等改良方法可提高体外培养的人表皮角质细胞存活率及生长速度。

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In this paper, the methods of pectin extraction and purification from plant tissues, including chemical and biological methods, are introduced.

本文综述了从植物中提取果胶的各种方法，包括化学提取法和生物提取法。

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The choice of purification methods and the source of the drug will determine the nature and amount of contaminants in the final medicine. (Nothing is ever 100% pure.) Moreover, protein folding, various kinds of enzymatic modifications and impurities inevitably introduce variation, sometimes with unexpected results.

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