Comparative ultrastructure of the yolk material in preimplantation stages of the hamster, mouse, and rat embryos
Comparative ultrastructure of the yolk material in preimplantation stages of the hamster, mouse, and rat embryos
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仓鼠、小鼠和大鼠胚胎植入前阶段卵黄材料的比较超微结构
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发表时间：
1980
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通讯作者：
B. Nilsson
中科院分区：
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作者：
B. Nilsson
通过标准化电子显微镜程序检查仓鼠、小鼠和大鼠胚胎植入前阶段的卵黄材料。该物质以原纤维形式存在，或多或少密集地分散在细胞质中。在仓鼠中，该材料以大块的形式存在，并且当纵向切割时，原纤维具有链状外观。原纤维的超微结构与螺旋图案相一致。原纤维的宽度为约40nm，节距(重复单元的轴向距离)为约30nm。在小鼠中，卵黄物质分散在细胞质中，形成小的斑块状群。此外，该物种的原纤维呈链状，但比仓鼠的要小。原纤维通常位置紧密，导致图像具有不同的晶体外观。在大鼠中，蛋黄呈亮色区域，占据了细胞质的大部分。卵黄斑中的原纤维稀疏且轮廓分散。它们比小鼠卵黄材料的原纤维更细，在所使用的分辨率下不显示任何螺旋图案，但显示出周期性。
Yolk material of preimplanation stages of embryos of the hamster, mouse, and rat were examined by a standardized electron microscopical procedure. The material was encountered as fibrils, scattered more or less densely in the cytoplasm. In the hamster, the material was present in large masses and the fibrils had a chain-like appearance when cut longitudinally. The ultrastructure of the fibrils was compatible with a helical pattern. The fibrils had a width of about 40 nm and the pitch (the axial distance of the repeating unit) was about 30 nm. In the mouse, the yolk material was dispersed in the cytoplasm forming small plaque-like groups. Also, in this species the fibrils were chain-like but smaller than in the hamster. The fibrils were often closely situated, resulting in images with varying crystalline appearances. In the rat, the yolk appeared as light areas occupying a substantial part of the cytoplasm. The fibrils in the yolk plaques were sparse and diffusely outlined. They were thinner than the fibrils of the mouse-yolk material, did not display any helical pattern at the resolution used, but showed a periodicity.