Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.

经等密度梯度离心分离，从褐煤、长焰煤、气煤和贫煤四种不同变质程度煤中获得了高纯度的有机显微组分。

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The purity of Human embryonic MSC which isolated by density gradient centrifugation and cultured by MEM culture medium in vitro is high. The activity of MSC is good.

用密度梯度离心法分离后MEM培养基体外培养的人胚胎msc纯度高，生物活性好。

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When the aqueous solvent (solvent a) is cleaned up in terms of an on-line precolumn, the purity of the organic solvent (solvent b) can be tested according to the chromatogram of the blank gradient.

当含水溶剂通过预柱在线净化后，根据空白梯度色谱图可测试有机溶剂的纯度。

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