缺血后脑的病理改变以神经细胞变性、固缩和退变，皮层下白质的神经纤维和髓鞘溃变为主，普遍存在胶质细胞增生，形成胶质小结。

There were obvious pathological change in the brain after the chronic cerebral hypoperfusion, such as myelinic degeneration and formation of glial nodule in white matter.

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结果：氦氖激光照射前后活细菌数无显著变化，但菌体的形态产生明显固缩。

Result: the amount of living bacterium: there is no significant difference before and after irradiated by the He-Ne laser at different time.

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修正了临界补缩固相率的概念，提出了立式离心铸造条件下的动态临界补缩固相率新概念。

Concept of critical feeding of solid fraction has been amended, and new concept of dynamic critical feeding of solid fraction under the vertical centrifugal condition was introduced.

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