精子的

To study the effect of different does methyltestosterone on Spermatogenesis and reproductive organs performance of mice.

目的 探讨不同剂量的甲睾酮对雄性小白鼠生殖系统的发育及精子发生的影响。

Summary Apoptosis is a common phenomenon during spermatogenesis, and its dysregulation has been associated with male infertility.

凋亡是精子发生中的普遍现象，凋亡的失调控被认为与男性不育的发生有关。

One was adjacent to the equatorial segment and the other adjacent to the spermatozoon tail.

依据膜蛋白成分的差异，牛精子头后部质膜可以划分为紧邻赤道板的sp18质膜区域(sp18-rich region)和紧邻尾段的无sp18质膜区域(sp18-free region)。

It is associated with the manchette, a transient microtubular structure believed to be important for morphogenesis during spermiogenesis.

我们在小鼠中进行了RIM-BP3基因的敲除，结果表明它的缺失会引起精子头部发育的异常，如核畸形和顶体脱离等，最终导致雄性不育。

Targeted disruption of the Ppp1cc gene, which encodes the PP1 gamma 1 or PP1 gamma 2 isoforms, causes male infertility in mice as a result of impaired spermiogenesis.

编码PP1γ1或PP1γ2的Ppp1cc基因缺失的雄性小鼠由于精子发生的削弱导致雄性不育。

There formed segregating cavities between spermatocyte cell-wall and spermogonium cell-wall and osmiophillic layers outside spermatocyte cytoplasmalemma, which indicated that the spermatocytes had begun to gradually break away from the male gametophytes and embark on independent development.

精母细胞与精子器的璧细胞之间形成了分离腔，在精母细胞质膜外形成了嗜锇层，这些结构的形成说明精母细胞已经开始与雄配子体逐渐分离，进入独立发育的阶段。

The development speed of gynogenetic embryos was later than that of the control group, and aneuploids were found in this study. The obvious improved survival of trochophore larvae with a peak at 40s UV exposure suggested the presence of a Hertwig effect in the gynogenesis of A. pectinata. When sperms were irradiated for 40s, the cleavage rate was relatively high (51.2%), the developmental rate of D-larvae became zero, and the rate of haploid reached the highest (36.8%).

经紫外线照射的精子受精后所产生的单倍体胚胎发育速度慢于正常受精所产生的二倍体胚胎，各照射组均出现非整倍体。40s照射组中卵裂率达到51.2%，D型幼虫发生率为0，单倍体率最高，达到36.8%，出现"Hertwig效应"。

It works by not allowing sperm to reach to the uterus.

它的工作原理是不容许的精子达到的子宫。

It may take some time before a vasectomy is considered to be successful. Tests must be carried out for a few months after the procedure to check if there is any sperm in the semen.

它可能需要一些时间之前，输精管结扎手术被认为是成功的测试必须进行了数个月后的程序，以检查是否有任何的精子在精液。

The extra X chromosome can come from either a sperm or an egg, with a 50:50 chance.

额外的X染色体可以来自一个精子或卵子，以50：50的比例平均分配的机会。

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。