leptotene

leptotene

1. At leptotene, the distribution of organelle was polarized.

减数分裂前，大孢子母细胞的核偏向合点端，核内出现核液泡，细胞器分布均匀，内质网多位于珠孔端。

2. Prophase may be divided into successive stages termed leptotene, zygotene, pachytene, diplotene, and diakinesis.

前期可被分为连续的阶段：细线期、偶线期、粗线期、双线期和终变期。

3. In leptotene the chromosomes,already replicated, start to codense and appear as fine threads, althouge sister chromatids are not yet distinct.

在细线期，染色体已复制，开始浓缩，呈现出明显的丝状，尽管姐妹染色单体还未分开。

4. We also discuss how these events regulate the opening and closing of the blood-testis barrier to permit the timely passage of preleptotene and leptotene spermatocytes across the blood-testis barrier.

对紧密连接动力学的影响因素以及其与精子发生和男性避孕间的关系进行了分析。

5. At the present time, the whole meiotic pr ocess from leptotene spermatocyte to round spermatid of mammal can indeed occur in vitro .

建立生精细胞体外培养模型有助于研究精子发生的调控机制,可用于辅助生育技术,治疗精子发生阻滞的患者；

6. leptotene stage

细线期

7. The characteristic of leptotene, zygotene, pachytene, diploene and diakinesis was observed.The meiosis of Periplaneta Brunnea is similar to other Periplanetas.

细胞分裂过程中细线期、偶线期、粗线期、双线期、终变期染色体形态学特征,结果表明褐斑大蠊减数分裂过程与蜚蠊属其他种相似,符合一般规律。