精子形成

ConclusionThe formation and diminishment of the manchette is in step with the condensation and elongation of the nucleus of the spermatid. Both the structural and positional changes of the manchette coincide with the changes of the nucleus. These results imply that manchette might play an important role in mouse spermiogenesis.

Manchette结构的形成和消失与精子细胞核的浓缩及延伸同步，其形态变化和位置改变与精子细胞核的形态学变化相吻合，在小鼠精子细胞变态成形过程中具有重要意义。

Genes important for male gametogenesis involved in highly con-served landmark events such as meiotic recombination, formation of the synaptonemal complex, sister chromatid cohesion, spermiogenesis during postmeiotic stages, and checkpoints and factors required for the meiotic cell cycle .

精子发生中的重要基因与一系列精子发生过程中阶段性的细胞事件密切相关，例如减数分裂重组、联会丝复合物的形成、姊妹染色体的结合、减数分裂后精子的变态以及减数分裂周期中的关键点和必需因子等。

ABSTRACT We divided spermatogenesis into two parts:The first part is the differentiation of spermatid and the second part is spermiogenesis.This is the second.

摘 要 华支睾吸虫精子的分化可以发现分为两部分，一是精细胞疼痛的发生，二是精子的形成，本文护士报道的为第二部分。

Puberty when the hypothalamus pituitary development formed to stimulate the beginning of testicular gonadal hormone secretion, so that in the vas deferens spermatogonium split into spermatocytes, and then split into sperm cells, sperm cells eventually split into sperm.

青春期时，丘脑下部垂体的发育形成了，刺激睾丸性腺开始分泌性激素，使输精管里的精原细胞分裂成精母细胞，再分裂成精子细胞，最终精子细胞分裂成精子。

The spermatophorins are transferred into the female sperm receptive organs and take part in the forming process of the spermatophore. During mating, the functional proteins transferred with the sperm can decrease female receptivity, increase egg production, and promote sperm storage and competition.

精包结构蛋白参与精包的形成；功能蛋白在交配过程中随精子一起转移到雌虫体内，导致雌虫行为和生理的深刻变化，如降低雌虫再交配率、提高产卵量、促进精子转移、储存和竞争等。

Spermiogenesis is a crucial process for germ cell formation, which ensures the efficient transmission of the paternal genome by the spermatozoa to the ooctyte at fertilization.

它包括染色质的压缩、顶体和鞭毛的形成以及去除多余的细胞质，是精子发生的一个重要环节，确保了成熟精子具有正确的形态和完整的功能。

We think that centrin play an important role in meiosis during Urechis unicinctus sperm metamorphosis difference and we also think that centrin may be related to trochophore cilia and sperm tail formation,and reconstraction of centrosome after fertilization.

我们推测Centrin在单环刺螠精子发生过程中减数分裂或精子细胞变态分化过程中发挥作用；在单环刺螠早期胚胎发育中，Centrin可能与受精后中心体的重建及担轮幼虫的纤毛形成有关。

PartⅡFeasibility of vitrifying normospermic samples using droplets without cryoprotectans Objective Discuss the feasibility of droplets to vitrify normospermic samples without cryoprotectants. Methods Normal prepared sperm were frozen by conventional freezing protocol and non-cryoprotectant freezing in droplets respectively. Freezing in droplets means freezing sperm in every 10ul drop. After thawing, compared the two groups'sperm mobilities.

第二部分微滴法无保护剂玻璃化冷冻正常精子的可行性探讨目的探讨在不添加冷冻保护剂的情况下微滴法玻璃化冷冻正常精子的可行性方法收集16份正常精液标本，上游处理后分别进行慢速冷冻和微滴法冷冻，微滴法即用拉细巴氏管将标本形成10ul的液滴，直接投入液氮内冻存，复苏后镜检其活动率。

Fornix fluid after first getting a check for the activities of the sperm, if sperm proved successful sexual intercourse, and then check cervical mucus, such as cervical mucus Drawbench long slide into the formation of a typical fern after drying crystallization can be considered suitable electoral test of time.

先取后穹窿液检查有无活动精子，如有精子证明性交成功，然后取宫颈粘液，如宫颈粘液拉丝长，放到玻片干燥后形成典型羊齿结晶，可以认为试验时间选得合适。

These critical spermatozoal functions are acquired in the epididymis where a specific luminal environment is created by the blood-epididymal barrier; proteins secreted by epididymal principal cells bind to maturing spermatozoa and regulate the maturational process of the spermatozoa.

精子功能在附睾特殊的管腔环境中获得，这一环境是由血-附睾屏障来维护。附睾主细胞分泌的蛋白与精子结合并调控精子的成熟。附睾中细胞-细胞间的相互作用通过粘附连接和紧密连接形成。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。