精母细胞

It was a new mousegene in GenBank and named as SRG-L(spermatogenesis related gene expressed in the latestages of spermatogenic cells). The sequence of this cDNA has been deposited in GenBankwith the Accession No. AY352586. 2. Analyses of expression characteristics of SRG-L during mouse spermatogenesis.The results of RT-PCR and Northern Blotting indicated that no expression signal of thisgene could be observed in primitive type A spermatogonia and type B spermatogonia. Asignal first appeared in diplotene/pachytene spermatocytes, and was significantlyintensified in round spermatids and elongating spermatids, findly went down to beundetectable in mature spermatozoa.

RT-PCR和Northern Blotting分析表明：该基因在早期A型和B型精原细胞中不表达，从双线期初级精母细胞阶段开始表达并逐渐上调，在粗线期初级精母细胞、圆形精子细胞及长形精子细胞中均检测到高水平的mRNA，但在成熟精子中消失，具有明显的阶段特异性表达特征，并且组织特异性表达分析显示该基因在睾丸组织中的呈高表达。

The results show that the CD29, CD49, CD90 express in the gonium and the primary spermatogenous, but there are not expression in the oocyte, the second spermatogenous and the spermatocyte.

研究结果表明，CD29， CD49， CD90在雌性生殖腺各级卵母细胞中均不表达，位于生殖褶边缘的性原细胞中可见表达；在雄性生殖腺的初级精原细胞中表达，但在成团分布的次级精原细胞、各级精母细胞中均未表达。

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。

Its development as follows: spermatogonia → primary spermatocyte secondary spermatocyte →→→ sperm sperm cells.

其发育过程为：精原细胞→初级精母细胞→次级精母细胞→精子细胞→精子。

AR expressed stronger in spermatocytes and spermatogenic cells, ER in germ cells and sperm expressed strong in the second spermatocyte, PR in Leydig cells also expressed stronger.

AR在精母细胞和精细胞中表达较强，ER在精细胞和精子中表达较强，精母细胞中次之，PR在睾丸间质细胞中表达较强。

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。

The spermatogenesis of Solen grandis included five stages: spermatogonium, spermatocyteⅠ, spermatocyteⅡ, spermatid and spermatozoon.

大竹蛏精子发生历经精原细胞、初级精母细胞、次级精母细胞、精细胞和成熟精子5个阶段。

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 five kinds of male germ cell cytogenetic assays used to detect genotoxicity of ani-mal drugs to each spermatogenetic stage of male germ cells,such as spermatogonia, primary spermatocytes, secondary spermatocytes,spermatids and spermatozoa,had beensystematically studied.

本文系统地研究了适合我国国情的检测兽药对哺乳动物精原细胞、初级精母细胞、次级精母细胞、精细胞和精子等各个发生阶段雄性生殖细胞遗传毒性的5种测定方法，并首次为国产阿维菌素安全性毒理学评价提供了系统的雄性生殖细胞遗传毒性资料。

Strong expression of nanos 1 mRNA was detected in spermatogonia and relatively weaker signal was found in primary spermatocytes but no nanos 1 mRNA expression was observed in spermatids. The results suggested that nanos 1 may play an important role in maintenance and functioning of the germline stem cell—oogonia and spermatogonia.

在斑马鱼精子发生中， nanos1 mRNA可在精原细胞和初级精母细胞中检测到。nanos1 mRNA的阳性信号在精原细胞中极为强烈，在初级精母细胞中较为微弱，而精子细胞中没有阳性信号。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。