端细胞

New bone formation was observed to be increasing significamly in both DCN bone cements and DC bone cements with the passage of time. By the end of 24 weeks, new bone had bridged the gap between the proximal and distal fragments in DCN bone cements and DC bone cements. By histomorphological detection in DCN bone cements, Abundant of chondral and new bone islands were seen at the site of defects 4 weeks after the operation and a number of new bones formed and enlarged by both enchondral ossification and appositional formation by the 8th weeks.

研究发现，DCN骨水泥植入4周大量间充质细胞分化，在材料与骨端之间出现一层软骨细胞，软骨细胞继续增生并向编织骨分化；8周材料降解的同时，小梁骨出现；12周新骨长入材料并已经基本替代完成，形成初步骨性连接；24周骨缺损完成骨性连接，新骨进行结构改建，材料内部形态结构明显变化。

Methods: Virus proliferation assay, cell viability assay and Western blot were performed to assess the selective replication and cytolysis of CNHK500 in telomerase positive liver cancer cells Hep3B, HepGⅡ, SMMC7721 and in normal cells.

方法利用病毒增殖实验、细胞活力实验、蛋白印迹分析来检测增殖病毒CNHK500在端粒酶阳性的肝癌细胞株HepGⅡ、Hep3B、SMMC7721及正常细胞中选择性增殖和溶解细胞的特性。

Methods: The telomerase activity in breast cancer cells and MRC-5 cell line were detected semi-quantitively by TRAP-ELISA assay. Virus proliferation as- say and cell viability assay were used to evaluate the proliferation and cytolysis selectivity of CNHK300, and the results were compared with those of wtAd5. The breast cancer cells were treated with CNHK300 combining paclitaxel to evaluate the killing effect of the combined regimen.

用TRAP-ELISA方法检测乳腺癌细胞株(MDA-MB-453、SK-BR-3)和正常成纤维细胞株MRC-5的端粒酶活性；进行病毒增殖实验和细胞生长抑制实验，并与野生型腺病毒wtAd5进行对比，验证CNHK300选择性复制和选择性杀伤能力；用细胞生长抑制实验进一步考察CNHK300与化疗药物紫杉醇联合应用对乳腺癌细胞的杀伤作用；用Western blot检测腺病毒E1A在细胞中的表达。

ABSTRACT: Objective To investigate the effects of epigallocatchin gallate on telomerase activity of bladder carcinoma cell line T24 and BIU87 and its possible mechanisms.

目的 探讨茶多酚对膀胱肿瘤细胞株T24和BIU87的端粒酶活性影响及其可能机制。方法用MTT法测定治疗组、阳性对照组、阴性对照组的细胞抑制率，用流式细胞仪测定细胞凋亡率。

The megaspore mother cell is located at the 3rd or 4th layer of cells in the nucellus top end. It divides transversally to form a linear megaspore tetrad, and the megaspore at the chalazal end develops into the embryo sac mother cell.

大孢子母细胞位在珠心顶表皮下第三或四层细胞处，经横分裂后产生一直线形的大孢子四分体，其中位居合点端的大孢子发育成胚囊母细胞。

During light adaptation, the diameter of rhabdoms was small, the arrangement of microvillus in the distal rhabdom was in disorder, and the area of the multivescicular bodies in the cytoplasm of the retinular cells was large, but the perirhabdomal vacuoles was very small, the amount of the lamellar bodies and mitochondrias were small, the pigment granules were distributed in all retinular cell.

结果显示：光适应时感杆束的直径较小，组成近远端感杆束的微纤毛排列零乱；小网膜细胞中的多囊体体积增大，膜下储泡囊体积减小，板膜体、线粒体等细胞器数量较少，色素颗粒分布于整个小网膜细胞。

Results : The telomere length in the SHEE and SHEEC was significantly shorter than that in the normal esophageal epithelial tissue , but maintained a stable length.

结果：SHEE 细胞和SHEEC 细胞的端粒平均长度比正常食管上皮细胞的明显缩短，但稳定维持在一定长度范围内。

We tested whether inhibitory GABAergic synaptic transmission regulates Xenopus optic tectal cell dendritic arbor development in vivo by expressing a peptide corresponding to an intracellular loop ofthe gamma2 subunit of type A GABA receptors GABA(AR, which is required to anchor GABA receptors to the postsynaptic scaffold.

我们想证明如下设想：抑制性GABA能突触传递是否能调节早蟾视顶盖细胞的树突发育。因为GABA受体的gamma2亚基有一段细胞内的跨膜端序列，这段序列对锚定GABAA受体到突触后膜是必须的，所以我们的主要方法是设计了一段特异性的争对细胞内段的序列，这样就特异性的阻断了单个细胞GABA能的突触传递。

Research progress of anti-tumor mechanisms of ginsenoside Rh2（G-Rh2） extracted from ginseng was expounded,and the anti-tumor activity and mechanisms of G-Rh2 were discussed on regula-ting signal access system of tumor cells,reversing abnormal differentiation and tolerance of tumor cells,reducing telomerase activity of tumor cells,strengthening immunological ability,improving anti-tumor ability ,and interdicting synthesis and metabolism of tumor cellular important components etc.

论述了从人参中提取的有效成分人参皂苷-Rh2（G-Rh2）的抗肿瘤机理的研究进展，并探讨了G-Rh2在调节肿瘤细胞信号通路系统、逆转肿瘤细胞的异常分化与耐药性、降低肿瘤细胞端粒酶活性、增强机体免疫力、提高抗肿瘤能力以及阻断肿瘤细胞某些重要成分的合成与代谢等方面的抗肿瘤活性及其作用机理。

The result showed that the surface architecture and ultrastructure of I.punctatus ' gill and secondary gill lamellae were similar to those of other teleosts. The surface of gill arches and gill rakers was covered with pavement cells which were characterized by circular microridges, and secreting-holes were found among cells on the surface of gill arches. The base part of gill rakers were bigger in terms of diameter. The pavement cells' surface of gill filaments' middle part was characterized by microridges with fine lateral protuberances on both sides which were either fused or interruped, while the microridges disappeared on the pavement cells' surface on both top and base parts of gill filaments, forming dense granulated protuberances. The height and interlamellar space of secondary gill lamellae in I.punctatus were relatively higher and bigger, respectively.

结果表明，斑点叉尾鮰鳃的表面结构和微细结构与其他硬骨鱼类基本相似，鳃弓和鳃耙表面被具环形微嵴的扁平上皮细胞所覆盖，鳃弓表面细胞之间有孔洞；鳃耙基部较粗壮；中部鳃丝上皮细胞表面的微嵴两侧有细小的横突，有些微嵴出现融合或间断；端部和基部鳃丝上皮细胞表面的微嵴消失，形成密集颗粒状突起；鳃小片的高度和片间距较大。

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。