有丝分裂的

Only amitosis takes place in both epidermal and hypodermal cell s of Firmiana simplex during cell division.

梧桐表皮细胞和下皮细胞的分裂只见无丝分裂而没有有丝分裂。2。

APC/C is activated at anaphase of mitosis,and engages in cell cycle regulation.

APC/C在细胞的有丝分裂期后期激活，调控细胞完成有丝分裂。

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。

Centromere The region of the chromosome that contains the kinetochore, the structure that becomes attached to the nuclear spindle during mitosis and meiosis.

着丝粒：染色体上包含着丝点的区域，在细胞有丝分裂和减数分裂期间与纺锤体相整合的一种结构。

General characteristics of cells, its chemical constituents ( protein, nucleic acid, carbohydrate, lipid), cell structure , cell cycle, cell division, four kinds of tissues (epithelial, connective, muscular, and nervous), organ, ten organ systems (dermal, skeletal, muscular, digestive, respiratory, circulatory, excretory, endosecretory, nervous, and reproductive).

细胞的一般特征，细胞的化学组成(蛋白质，核酸，糖类，脂类)，细胞的结构，细胞周期，细胞分裂(无丝分裂，有丝分裂，减数分裂)，四大组织(上皮组织，结缔组织，肌肉组织，神经组织)，器官，十大系统(皮肤系统、骨骼系统、肌肉系统、消化系统、呼吸系统、循环系统、排泄系统、内分泌系统、神经系统和生殖系统)。

Mitogen-activated protein kinase cascade and maturation-promoting factor play very important roles during meiotic maturation and fertilization of oocyte.

目的探讨有丝分裂促进因子和丝裂原活化的蛋白激酶在小鼠受精卵第一有丝分裂期中的作用及相互关系。

Mitotic rate was low in all cases, ranging from 0 to 2 mitoses/10 high-power fields.

所有病例中的细胞有丝分裂率都很低，0-2个有丝分裂/10个高倍视野。

There are four kind of isoforms of endothelin in human and other mammals named ET-1, ET-2, ET-3 and ET-β, which are slightly different in construction and pharmacological effect. In human beings, ET-1 is the dominative subtypes. ET-1 remains in blood at a low level about 5ng per liter on physical state. It is synthesized, stored, released and metabolized locally. The half-life of ET-1 is about 1 hour. ET-1 is the most potent vasoconstrictive factor till now, and it is more functional in vein than in artery. In vascular bed, there are two kind of ET receptors. Type A mainly located in smooth muscle cells, whereas type B in endothelial cells. The latter can stimulate intimal hyperplasia via a parasecretion way and activate some oncogenes such as c-fos and c-myc and then enhance their expression. These alterations result in constriction of blood vessels, thus the SMC steps into proliferate state from silent state.

人及哺乳动物体内有四种结构及药理学性质略有差异的异物体，分别为ET-1、ET-2、ET-3、ET-β，而在人主要是ET-1，在生理条件下，ET-1在血浆中含量较低，约为5ng〓，故ET-1不是一个循环激素，而是局部合成释放，局部起作用的活性物质，半衰期约1小时，ET-1是目前已知的最强的血管收缩剂，对静脉的作用比动脉强，在血管床，ET受体有A、B两型，A型主要分布在平滑肌细胞，B型主要分布在内皮细胞，它可以通过旁分泌途径刺激内膜增生，具有有丝分裂原效应，可以激活某些癌基因如C-fos、C-myc使其表达增强引起血管收缩，使静止期SMC进入增殖期，还可以通过信号传导途径，与bFGF、GTF-β、PDGF等生长因子协同作用，起共有丝分裂原作用。

Objective To study on the function of mitogen- activated protein kinase and mitosis- promoting factorin the first mitosis of mouse fertilized eggs and the relationship between them.

目的探讨有丝分裂促进因子和丝裂原活化的蛋白激酶在小鼠受精卵第一有丝分裂期中的作用及相互关系。

The results indicated that γ-rays irradiation with lower doses could promote and stimulate mitosis of root tip cells, and with high doses could inhibit mitosis of root tip cell.

结果表明，在一定范围内，剂量低于60Gy的辐照对毛竹根尖细胞有丝分裂有促进和刺激效应；高于90Gy对毛竹根尖细胞有丝分裂有一定的抑制作用。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐