睾丸的

To investigate whether the expression of cdc2 and cyclin B1 in spermatogenic cells during spermatogenesis is actually a temperature dependent event, in situ hybridization, Western blotting and immunohistochemistry analysis were used to study the expression of cdc2 and cyclin B1 in normal and cryptorchid testis. Results showed that heat would differentially hurt male germ cells in different developmental stages during spermatogenesis, especially the pachytene primary spermatocytes. Most of spermatogonia in contralateral cryptorchid testis were not harmed fatally by heat as yet, indicating that spermatogonia could resist to beat to a certain extent. In this case spermatogonia could develop to pachytene/diplotene primary spermatocytes, but they could not acquire the ability to complete the transition from mitosis to meiosis, and then appeared to go through apoptosis. Therefore, we could not find the descendants of meiosis: secondary spermatocytes and round spermatids, elongated spermatids and spermatozoon. The abdominal temperature had no significant influence on the transcription of cdc2 and cyclin B1 in the spermatogonia and pachytene/diplotene primary spermatocytes. In normal rabbit testis, cyclin B1 increased in the pachytene/diplotene primary spermatocytes before meiosis and reached its peak in the spermatids.

为了解精子正常发生过程中cdc2和cyclin B1表达的低温依赖性，我们利用原位杂交和免疫组化等方法，研究了正常和隐睾精子发生过程中cdc2和cyclin B1的转录和翻译调控活动，结果表明：（1）热对各阶段的雄性生殖细胞都有损害，粗线期的初级精母细胞尤为敏感，实验性隐睾内的精原细胞尚未完全受到"致命"影响，说明精原细胞对热有一定的耐受性，但即使成为粗线期／双线期初级精母细胞，却未能获得由有丝分裂过渡到减数分裂的能力，呈现不同程度的凋亡，所以在整个切片中找不到源自减数分裂的产物----次级精母细胞、圆形精子细胞，更谈不上长形精子细胞和精子的形成；（2）腹腔高温未明显地影响隐睾精原细胞和粗线期/双线期初级精母细胞中cyclinB1和cdc2的转录，说明高温并不是通过影响cyclin B1和cdc2的转录活动而导致生精过程阻断的；（3）正常兔睾丸组织中，〓在精原细胞和粗线期／双线期精母细胞中均有表达：cyclin B1蛋白在减数分裂前期的粗线期／双线期初级精母细胞中的表达量增加，于变态末期的精子细胞中达高峰。

"Spermatogenesis is a long and complex process controlled by multiple interacting mechanisms, and there is a general consensus on the need for FSH in the regulation of this process," write Carlo Foresta, MD, and colleagues from the University of Padova in Italy.

精子的生成是一个很长且很复杂的过程，它是由多种彼此作用的机制控制的，在这个过程中，一般都一直需要卵滤泡刺激素的作用，」意大利Padova大学的Carlo Foresta医师及其同事写道：「从睾丸细胞学分析的结果可以看到，采用100 IU剂量的重组人卵滤泡刺激素隔日使用，以刺激精子产生的过程，同时，还可以增加射出的精子的数目，并加强抑制素B的分泌。

Senior students have a poor knowledge on sex. They master menstruation, prostitution, being fertilized, childbearing, abnormality well while they know little about sex hormones,sexual intercourse and pregnancy,spermatorrhea,ovaries, testis in the middle. 2. senior students have developed a quick consciousness of sex. About 17.7% boys and 17.2% girls desire to date with the opposite sex. 54.1% boys and 42.2% girls are willing to date with the opposite sex. What's more, the willingness and percentage of dating with the opposite sex increase with the grade. Senior students do not have a steady and stable affection.

研究结果表明：1、高中生性知识相对贫乏，高中生掌握得较好的概念依次是月经、卖淫、受精、分娩、性变态；掌握较差的概念依次是性激素、性爱抚；对妊娠、遗精、卵巢、睾丸等概念的掌握的程度大致相当。2、高中生性心理表现为：性意识发展迅猛，主要表现在对异性的极大关注和向往，约有17.7%、17.2%的男、女高中生渴望与异性交往；约54.1%、42.2%的男、女高中生愿意与异性交往，并且这种异性交往的愿望随年级升高有上升趋势，并且随着年级的增加，同一年级中男、女生渴望交往愿望的性别差异也在增加；性情感稳定性不高，约37.7%和32.7%的男女高中生谈过恋爱，目前仍有9.8%和10.9%的男女高中生正在恋爱。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。