如果您使用的是一组全充的AA电池来提供电压和电流，那么它们只能支撑几个小时。

If you use a set of fully charged AA size batteries to provide voltage and current they last only a few hours.

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结论采用全骨髓直接培养及密度梯度离心法，经3 ~ 5代培养后均可获得相对纯化之骨髓间充质干细胞。

Conclusion Byuse complete marrow direct culture method and density gradient method, after 3 ~ 5 passages, relative purified BMSCs can be obtained.

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结论改良全骨髓贴壁法可有效分离培养大鼠的骨髓间充质干细胞，是一种比较理想的分离培养方法。

Conclusion The improved method of whole bone marrow adherent. can successfully isolate and culture BMSCs in rats, which is proved to be an optimal methods for cell preparation and culture.

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