端细胞

With an orthogonal experiment design , the telomerase inhibitors [azidothymidine , AZT 300 mg/ and lamivudine 150 mg/, per os , bid ,×2 weeks ] and X2irradiation [ total dose 10 Gy (2 Gy ×5) in 1 week ] were used to treat BALB/ c mice carrying breast cancer MA782 for evaluating the influence on peripheral blood cells , bone marrow nucleated cells and telomerase activity.

为了探讨端粒酶抑制剂联合X 线照射对荷瘤小鼠的骨髓抑制作用，采用正交实验设计，应用端粒酶抑制剂[AZT 300 mg/， lamivudine 150 mg/ ]联合X 线照射(2 Gy ×5次/ 1 周)处理移植性乳腺癌(MA782 )小鼠，观察其对骨髓有核细胞、外周血像及骨髓端粒酶活性的影响。

Antigene peptide nucleic acid specifically inhibits MYCN expression in human neuroblastoma cells leading to cell growth inhibition and apoptosis Roberto Tonelli,Stefania Purgato,Consuelo Camerin,Raffaele Fronza,Fabrizio Bologna,Simone Alboresi,Monica Franzoni,Roberto Corradini,Stefano Sforza,Andrea Faccini,Jason M. Shohet,Rosangela Marchelli,and Andrea Pession Department of Pediatrics, University of Bologna,Sant'Orsola-Malpighi Hospital, Bologna, Italy; Department of Organic and Industrial Chemistry, University of Parma, Parma,Italy; and 3Center for Cell and Gene Therapy, Texas Children's Cancer Center, Baylor College of Medicine, Houston, Texas Abstract We developed an antigene peptide nucleic acid for selective inhibition of MYCN transcription in neuroblastoma cells, targeted against a unique sequence in the antisense DNA strand of exon 2 of MYCN and linked at its NH2 terminus to a nuclear localization signal peptide.

抗原肽核酸抑制MYCN具体表达的神经母细胞瘤细胞，导致细胞生长的抑制和凋亡罗伯托利，斯特凡Purgato ，苏埃洛卡默琳，拉菲尔Fronza ，梅奥尼博洛尼亚，西蒙娜Alboresi ，莫妮卡弗兰索尼，罗伯托Corradini ，斯特凡诺斯福尔扎，安德烈Faccini ，杰森先生Shohet ， Rosangela Marchelli ，和安德烈Pession儿科，博洛尼亚大学，圣' Orsola -马尔皮基医院，博洛尼亚，意大利；有机部和工业大学化学帕尔马，帕尔马，意大利和3Center的细胞和基因治疗，德州儿童癌症中心， Baylor医学院，得克萨斯州休斯敦摘要我们开发了一种抗原肽核酸的选择性抑制神经母细胞瘤MYCN转录细胞，针对一个独特的序列反义DNA链的第2外显子，并与在MYCN 其氨基端为核定位信号肽。

Purpose : To study the relationship of the telomere length and telomerase activity to immortalization or malignant t ransformation of the immortalized esophageal epithelial cell line and malignantly t ransformed cell line induced by E6 and E7 genes of HPV 18 type.

目的：探讨端粒长度、端粒酶活性以及端粒酶亚单位组分的表达与食管上皮细胞永生化和恶性转化之间的关系。

While the tissue spaces surrounding a few blood vessels wasAl and Fg positive,no Al or Fg positive cells were observed.In antemortem injurygroup,diffuse subarachnoid hemorrhage,cerebral edema,swelling or pyknotic neu-rons could be observed.The axons showed irregular swelling and disconnection at1～3h,marked swelling and disconnection at 6h,and retraction ball at 15h whichwas more remarkable at 24h after injury.The space between myelin sheaths andaxons was increased at 3～6h after injury.Tortuous and wavelike myelin sheathswhich adhered on axons incompletely,or even peeled off could be found from 15hto 24h after injury.Perinuclear lysis of Nissl bodies began at 24h after injury.Thenumber of GFAP positive cells in cerebrum and brain-stem increased significantlyfollowed by decrease,and then increased again,but the time courses of the changesin different areas of brain were not same.Al and Fg positive neural cells,mainlysurrounded blood vessels,with diffuse or peripherally distributed positive matter incytoplasm could be observed at 0.5h after injury.The number of Al or Fg positivecells and the intensity of immunoreaction increased with the time of injury.The areaof SYN positivity in medulla oblongata and pons decreased notably 3～6h afterinjury,then return to normal levels and continued to 24h after injury.

生前损伤组，可见广泛蛛网膜下腔出血，脑组织水肿，神经细胞肿胀，晚期神经元固缩；伤后1～3h见部分神经轴突不规则增粗、断裂，伤后6h断端膨大，伤后15h可见收缩球，至伤后24h更为明显；伤后3～6h可见部分神经髓鞘与轴突之间的间隙增宽，伤后15h髓鞘明显曲折，不完全附着在轴突两侧，甚至剥脱，持续到伤后24h；核周尼氏体减少在伤后24h才开始出现；同一部位的GFAP阳性细胞数目随损伤时间发生改变，先增多（最早在伤后0.5h），达到高峰后减少，其后又有增多趋势，但不同部位的GFAP阳性细胞数目增减的时间过程不尽相同，同时，大脑中的GFAP阳性细胞数目也有改变；伤后0.5h，可在脑干组织中见到Al和Fg阳性神经细胞，主要位于血管周围，阳性物在胞浆中呈弥散性分布，但部分细胞的阳性物仅分布于靠近胞膜的胞浆中而呈环状，随损伤时间延长，阳性细胞数目增多，反应强度增加；伤后3～6h，延髓及桥脑中的SYN阳性物面积减少，其后恢复到正常水平，并持续到伤后24h。

As expected, EPSP amplitudes increased and the summation of distal dendritic EPSPs decreased （though tended to be more sublinear） but the proximal summation was not affected.

结果表明，海马CA1区锥体细胞近、远端树突的空间整合都是亚线性的；近端树突的空间整合不受期望值大小的影响，但远端树突的空间整合随期望值增加而减小。

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)。

Megaspore mother cells undergo meiosis, which results in the formation of 4 megaspores in a row. The chalazal-most cell develops into an 8-nuclei embryo sac after 3 rounds of mitosis. A mature embryo sac is produced after cellularization and nuclear migration.

结果表明：1大孢子母细胞经过减数分裂形成直线排列的4个大孢子，其中珠孔端的3个大孢子退化，合点端的大孢子进行3次有丝分裂，形成八核胚囊， 8个核迅速细胞化，最终发育为成熟胚囊。

The telomere and telomerase play an important role in the malignant progress of tumor cells and the mainten.

端粒—端粒酶系统在肿瘤细胞的恶性进展和永生细胞的维护中起重要作用。

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。