ユムシの卵胚胞崩壊時における核膜微細構造の変化
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概要
- 論文の詳細を見る
Changes in the fine structure of the nuclear envelope during the maturation division were investigated in Urechis eggs under an electron microscope. The nuclei of unfertilized eggs have typical double membranes which together are about 300A thick and on which many annuli are arranged at regular intervals of 0.25μ between centers. After 15 minutes from insemination, the membranes of germinal vesicles begin to disappear, and various stages of the process of breakdown of the nucleus can be observed. Using an electron microscope, many small vesicles become apparent in the nuclear membranes. It may be suggested that the double membranes are pinched at meny points and swelled at others, then, as a result of mechanical distortion, the membranes disintegrate into many small vesicles and are dispersed in the cytoplasm. The authors propose the following hypothesis : the process of formation and disintegration of the nuclear envelope in the mitotic cycle is essentially a reversible process of "aggregation-dehydration" and "hydration-separation" of the cytoplasmic vesicles which are closely related to the endoplasmic reticulum.
- 社団法人日本動物学会の論文
- 1964-01-15