端细胞的

There are commonly eight nuclei in the embryo sac: the egg apparatus at the micropylar end, made up of an gee nucleus and two synergid nuclei; three antipodal cells at the oppsite chalazal end that probably aid embryo nourishment; and two polar nuclei in the center that fuse to form the primary endosperm nucleus.

通常胚囊中有8个核，卵器在珠孔端，由卵和两个助细胞组成；3个反足细胞在合点端，可能为胚胎提供营养；胚囊中央有2个极核，融合在一起形成最初的胚乳核。

The proximal and distal nerve stumps were sutured l cm apart, in an end-to-side fashion like ＂π＂, to the epneurium windows, opened by removing the epineural sheath on the intact tibial nerve trunk with 1 mm long.

方法将大鼠右侧腓总神经在胭窝处剪除约5mm后，将断裂的腓总神经近端和远端分别就近与同侧胫神经上的外膜窗施行端侧吻合，吻合口间距约10mm；动物存活24个月后，将手术侧近端吻合口以上胫神经剪断，再将辣根过氧化物酶注入远段腓总神经干内，72h后取材并经四甲基联苯胺显色显示脊髓L3-6节段神经元和L4、L5脊神经节细胞，同时取腓总神经远段行电镜观察神经纤维再生状态。

Antipodal cells The three haploid cells found in the embryo sac of seed-bearing plants that migrate to the chalaxal end of the sac farthest from the micropyle.

反足细胞：胚囊三次分裂形成卵细胞，助细胞和极核等，其中位于合点端的三个单倍体细胞称反足细胞。

In order to evaluate the roles played by telomerase activity and apoptosis gene in malignant transformation of mammary atypical ductal hyperplasia, as well as the ultrastructure characteristic and regular pattern in the transformation, we investigated the expression of telom- erase genes and apoptosis related genes (p53 and bcl-2) and ultrastructure characteristic in precancerous lesion-mammary atypical ductal hy- perplasia, and compared with breast carcinoma and benign hyperplasia.

本文研究端粒酶基因、凋亡相关基因（p53、bcl-2）在乳腺癌前病变-乳腺导管非典型增生中的表达情况，探讨乳腺导管非典型增生上皮的超微结构特征，并与乳腺癌、乳腺导管单纯性增生进行对比，旨在研究端粒酶活性变化及凋亡相关基因在乳腺导管非典型增生上皮细胞癌变过程中的作用及意义，并研究乳腺导管非典型增生上皮细胞恶性转化过程中的形态结构特点及变化规律。

Methods Amplify the cDNA sequence encoding truncated HCV gene, with a part of carboxyl-terminus deleted, by PCR. Synthesize the mimic epitope at E2 region of HCV and seven T or Th cell epitope genes of NS3-NS5 respectively. Bind HCV core gene with a part of carboxyl-terminus deleted to the synthetic epitope gene by PCR, then clone into eukaryotic expression vector pcDNA3.1 and transiently transfect COS7 cells.

用PCR方法扩增核心区羧基端部分缺失的基因片段；分别合成HCV E2区模拟表位和NS3~NS5 7个T或Th细胞表位基因；PCR方法将羧基端部分缺失的HCV核心区基因与合成的表位基因串联，克隆入真核表达载体pcDNA3.1，并通过脂质体瞬时转染COS7细胞。

Methods Epithelial cells and fibroblast from ameloblastoma, keratocyst, dentigerous cyst, radicular cyst and oral mucosa were cultured and observed by phase-contrast microscope.

原代体外培养成釉细胞瘤细胞、牙源性角化囊肿、根端囊肿及口腔粘膜的上皮细胞和成纤维细胞，倒置光相差显微镜观察。

93Nm respectively. There were three types of connection forms between endothelial cells including end-end (12.4%), overlapping (53.9%) and interdigitating (33.7%) junctions, the opening condition between endothelial cells was 1.1%.

内皮细胞间的连接方式有3种，即插入连接(33.7%)、重叠连接(53.9%)和端端连接(12.4%)；处於开放状态的占1.1%；内皮细胞连接处有特殊连接装置的占53.9%。

The human tumor cells were positive for the telomerase activity and the heat-treated cells were negative.

结果 肿瘤细胞株的端粒酶活性阳性率为100%，10、100、500个Hela细胞均为阳性，加热处理后的细胞端粒酶活性均为阴性。

It was used to detect telomerase activity in 293 cells and RNase-pretreated or heat-treated cells as control.

与常规TRAP法相比较，应用端粒酶TRAP-ELISA法检测端粒酶阳性的293细胞和阴性对照标本(加热或RNase处理和正常人内皮细胞)。

Telomerase enzyme, containing a catalytic subunit, the human telomerase reverse transcriptase, and a small integral RNA component, synthesises the telomeres, the ends of eukaryotic chromosomes.

端粒酶包含有一个催化亚基——人端粒酶逆转录酶，与一小段RNA组分共同合成端粒。端粒位于真核细胞染色体的末端。

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。