Fine structure of the mitotic cycle of unfertilized sea urchin eggs activated by ammoniacal sea water.
Fine structure of the mitotic cycle of unfertilized sea urchin eggs activated by ammoniacal sea water.
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氨海水激活的未受精海胆卵有丝分裂周期的精细结构。
DOI：
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发表时间：
1979
影响因子：
6.6
通讯作者：
D. Mazia
中科院分区：
文献类型：
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作者：
N. Paweletz;D. Mazia
未受精的海胆卵在用含有氨的海水处理后进入有丝分裂染色体周期。无法找到中心粒，但在周期的后期形成了微管。微管以星形排列的形式显示，以一串嗜奥斯体为中心。在早期阶段，浓缩染色体上的不同动点不附着于微管。之后，一些微管可能附着在动点上。染色体和微管被包含在一个“透明带”中，这是一个巨大的紧密堆积的膜，它取代了该细胞区域中的卵黄颗粒和线粒体，但不包括核糖体。没有形成两极纺锤。
Unfertilized sea urchin eggs enter a mitotic chromosome cycle after treatment with sea water containing ammonia. Centrioles cannot be found but microtubules are formed in the later stages of the cycle. The microtubules are displayed in an astral arrangement centered on clusters of osmiophilic bodies. In early stages, distinct kinetochores on the condensed chromosomes show no attachments to microtubules. Later, a few microtubules may be attached to the kinetochores. The chromosomes and microtubules are contained in a "clear zone", a large compact accumulation of membranes which displaces yolk particles and mitochondria, but not ribosomes, from that region of the cell. No bipolar spindle is formed.