概述了异染色质生化组成及其在超微结构方面的研究进展，着重介绍了着丝粒的异染色质超微结构研究。

The paper has summarized development of biochemical component and ultrastructure of heterochromatin in eukaryote with an introduction to the development of ultrastructure in centromere.

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谷物色选机利用光电技术，根据颜色和形状的差别，从谷物中将颜色不正常或感染了病虫害的异色粒、被害粒以及石子等外来夹杂物检出并分离。

Grain color selector with photoelectricity technology, is used to detect and separate the bad works from the grain compound, based on the differences of color and shape.

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异基因造血干细胞移植是目前唯一可以治愈慢粒的疗法，在年轻患者中尤为成功。

Allogeneic stem cell transplantation is the only treatment that can cure CML at this time. This treatment is most successful in younger patients.

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