端细胞的

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。

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。

In the functional cell such as archesporial cell,megasporocyte,dyad,tetrad and youngmegaspore,among which the three cells close to micropyle end do not degeneratewholly,no clear starch grains were observed as well as in the embryo sacs from singlenucleate embryo sac to 8-nucleate one just forming.

淀粉粒变化有规律性，在孢原细胞、大孢子母细胞、二分体、四分体和早期的大孢子（即四分体中近珠孔端的3个细胞未完全退化）等功能性细胞中未观察到明显的淀粉粒。

CML is cytogenetically marked by the philadelphia chromosome, which originates from a reciprocal translocation between chromosome 9 and 22 and is molecularly marked a chimeric bcr-abl gene, resulting from juxta-positive of the abl proto-oncogene on chromosome 9 with the bcr gene, which is normally located on chromosome 22. The chimeric bcr-abl gene expression an 8. 5kb hybrid mRNA transcript giving rise to a 210-KD fusion protein (P210〓) with increased tyrosine kinase activity. P210〓 plays a key role in the pathogenesis of CML. The continuous cell line K562 was established from the pleural effusion of a 53-year-old female with CML in terminal blast crisis, and was a human erythroleukemia line, contained Ph chromosome.

绝大多数慢粒患者白血病细胞中具有Ph染色体，是由9号染色体长臂3区4带和22号染色体长臂1区1带相互易位形成，即t（9；22），使位于9q〓的c-abl原癌基因在第二外显子的5'端断裂并易位到22 q〓的M-bcr基因第2或第3外显子的3'端，形成异常的bcr-abl嵌合基因，该基因转导出异常的mRNA，编码并翻译出P210蛋白，该蛋白具有很强的酪氨酸激酶活性，使粒细胞发生恶性增殖。K562细胞属于慢粒急变、红白血病细胞株，具有Ph染色体。

Results The intramural capillary lymphatics of rat's rectum were observed in deep lamina propria of tunica membrane and the dermal papilla layer of anal pectin. The intramural capillary lymphatics and lymphatics were both observed in tela submucosa, reticular layer, hypodermis and intermuscular and serosa. The capillary lymphatics in rectums' wall have the similar ultrastructure feature to normal ones. Three kinds of endothelial cells junctions are overlapping junctions, embedding-junctions and end to-end-type junctions. About 21% of cell-junctions are opening types. There are normal organelles and many vesicals in the endothelial of capillary lymphatics.

结果 直肠壁内的毛细淋巴管见於黏膜固有层深部和肛梳区真皮乳头层；在黏膜下层和肛梳区的网状层、皮下组织以及肌层和浆膜层内均有毛细淋巴管和淋巴管，直肠壁内毛细淋巴管的超微结构具有一般毛细淋巴管超微结构的特点，内皮细胞连接有重叠、嵌插和端端连接3种类型，处於开放状态约占21%；胞质内含有一般的细胞器，幷含有大量的囊泡。

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。

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。

We found that neither the fusioned nor the non-fusioned forms of Hu-P68 cDNA open reading frame could express efficiently in the E. coli cells; in different prokaryotic expression vectors and under various promotors resulted in no distinctive variations. Deletion of 5'UTR by synthesis adaptors, deletion of 3'UTR or signal peptide sequence by PCR gained no gross improvement. Only the truncated API-I proteins were observed to be highly expressed when the 3'ORF fragment of the Hu-P68 cDNA was fusioned at the 3'end of PAI-I gene.

结果发现无论是以融合形式存在，还是以非融合形式存在，人的P68 cDNA基因在E.coli细胞中都未能获得高效表达：在不同表达载体中，不同启动子对P68 cDNA基因的表达没有显著差异；利用合成Adapter的方法删除5'UTR，及利用PCR技术删除3'UTR和信号肽序列对表达没有明显改善；分别表达被分割的P68 cDNA5'端编码区、中央编码区和3'端编码区均未见有明显表达；当P68 3'端编码区与高效表达蛋白PAI-Ⅰ基因3'末端融合时，仅见有PAI-Ⅰ以截断形式高效表达出来。

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。