精子的

According to the changes of the structure of chromatin and the morphology of cell, the process of the typical spermatogenesis of Cipangopaludina chinensis can be divided into five stages: spermatogonium, primary spermatocyte, secondary spermatocyte, spermatid and mature sperm.

中国圆田螺典型精子发生时，根据染色质和细胞形态的变化，可将其发生分为以下五个时期：精原细胞、初级精母细胞、次级精母细胞、精细胞和成熟精子。

The spermatogenesis includes five stages: spermatogonium、primary spermatocyte、secondary spermatocyte、spermatid and spermatozoon.

雄体的生殖细胞发生经历精原细胞、初级精母细胞、次级精母细胞、精子细胞和成熟精子五个时期。

The spermatogenesis includes five stages: spermatogonium、primary spermatocyte、secondary spermaticyte、spermatid and spermatozoon.

雄体的生殖细胞发生经历精原细胞、初级精母细胞、次级精母细胞、精子细胞和成熟精子五个时期。

Result The results showed that vitamin A addtion in ration significantly improved the quality of semen, the density of spermatozoon, and reduced the teratospermia rate.

结果］结果表明：适当添加一定量维生素A，有助于提高种公猪的采精量、精子密度，降低精子畸形率。

The mechanisms responsible for spermiogenesis are poorly understood.

这一过程叫做精子形成。目前，关于精子形成的机制，人们还知之甚少。

Many sperm and egg surface proteins are reported to be involved in sperm zona pellucida interaction.

精子、卵子表面有多种蛋白参与精子与透明带的结合过程。

AIM: To observe the effect of levocarnitine on epididymal sperm in patients with obstructive azoospermia.

目的：观察左卡尼汀治疗对梗阻性无精子病人附睾精子质量的影响。

Objective: To study the clinical effect of intracytoplasmic sperm injection in treatment of oligozoospermia, azoospermia and teratozoospermia.

目的：探讨采用卵胞浆内单精子显微注射治疗少、弱、畸精子不育症的临床效果。

Objective To investigate androgen receptor mRNA expression in severe oligozoospermia or azoospermia patients.

目的研究严重少精子或无精子症患者外周血中雄激素受体mRNA的表达。

Objective To investigate the clinical efficiency of intracytopalmic sperm injection with testicular sperm aspiration in the treatment of obstructive azoospermia.

目的 探讨单精子卵胞浆内注射治疗梗阻性无精子症的临床疗效。

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。