端细胞

The archegonial initials could be distinguished from the perip heral cells at the micropyle end of the female gametophyte before the completion of the wall formation where the cell wall had reached the center of the gametop h yte.

雌配子体中游离核之间细胞壁还未完全形成时，在其近珠孔端表面可看到颈卵器母细胞发生。

Objective To investigate the relationship between the telomer ase activity and apoptosis in gastric cancer.

目的为了探讨胃癌组织中端粒酶与细胞凋亡的关系。

MATERIALS: The demineralized bone was prepared with cancellated bone of metaphysis from newborn calf via treatment of decalcification, defatting, acellular, remove antigen, and deproteinization.

材料：取新生小牛四肢长骨干干骺端的松质骨置于脱钙液中脱钙、脱脂、去细胞、去抗原和去蛋白等程序处理制备成脱钙骨支架。

Ovule development began in August, and rectangle megasporocyte began to occur in December, and linear tetrads of megaspores were formed in meiosis. In most occasions, only the chalazal megaspore was functional.

云南红豆杉胚珠从8月开始发生，大孢子母细胞12月开始发生，呈方形，减数分裂后形成4个&一&字形大孢子，在大多数情况下，只有靠合点端的大孢子发育为功能大孢子。

Megaspore development and abortion of"Pingyi Tiancha"Compar-ing with regular developing megaspore of normal M.baccata,the megasporemother cellof"Pingyi Tiancha"could form mono-nucleus embryo sacby perhaps irregular meiosis,then most of sexual MES depauperatedand degenerated,finally aborted,or only a few further developed.Of asexualembryo sac,one or more large cells at the chalazal end of nucellus developed in-to one to more asexual embryo sac initials.After the competition between sexu-al embryo sacand asexual embryosac,most ovules only had one asexual embryo sac matured.

平邑甜茶大孢子的发育和败育与正常发育的山定子大孢子对比，平邑甜茶大孢子母细胞经减数分裂能形成单核胚囊，之后多数有性胚囊萎缩、退化而败育，只有极少数进一步发育；而无性胚囊则从胚珠合点端1个或多个较大的珠心细脆形成并首先发育为一个或多个无性胚囊原始体；经过有性胚囊和无性胚囊以及无性胚囊和无性胚囊之间的竞争，多数胚珠只有一个无性胚囊成熟。

Objective To investigate the effects of chemotherapeutic drugs with different dose on telomere length of BEL-7404 cells.

目的 观察不同浓度几种化疗药物对人肝癌BEL-7404细胞端粒长度的影响。

Objective To express the N-terminal fragment of human mast cell chymase in E.coli and prepare its polyclonal antibody from mouse.

目的：在大肠杆菌中表达人肥大细胞类糜蛋白酶N端片段，并制备其鼠源性多克隆抗体。

Methods: Five 10-23 deoxyribozymes (DZ1-DZ5) with 2 phosphorothioate groups at 5' and 3' end were designed and synthesized. Full sequence ET-1 RNA was transcripted and FAM-labeled 10-23 deoxyribozyme was used to select cleavable 10-23 deoxyribozyme in vitro and to detect intracellular uptake. The content of ET-1 mRNA was measured by semi-quantitative RT-PCR after 10-23 deoxyribozyme was transfected into cultured neonatal rat cardiomyocytes.

体外转录ET-1全长RNA底物，设计并合成5条ET-1 10-23脱氧核酶(DZ1~DZ5)，其5'及3'端各有2个核苷酸硫代修饰，体外切割ET-1RNA底物，筛选有效脱氧核酶；5'标记荧光素FAM的10-23脱氧核酶瞬间转染新生大鼠心肌细胞以观察对10-23脱氧核酶的摄取；采用半定量RT-PCR检测ET-1基因的表达。

Articular cartilage is a layer of low-friction, load-bearing soft hydrated tissue covering articulating bony ends in diarthrodial joint.

关节软骨是覆盖在动关节骨端表面的一层低摩擦、可承载负荷的水合软组织，其力学性能通过软骨细胞的新陈代谢来维持。

Analysis of PcG mutants shows that the PcG system represses genes required for anteroposterior, dorsoventral, and proximodistal patterning of imaginal discs and that it also represses cell cycle regulator genes.

对PcG突变体研究发现，PcG系统表达基因在幼虫发育的前端、背腹以及远端模式都是必须的，同时可抑制细胞分裂调节基因的活性。

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。