核的

The ultrastructural changes during the development of sieve element companion cell complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC tome from the same secondary phloem mother cell. The development of sieve element went through three stages, i. e. immature, mature, and degenerate stage. In immature stages the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost.

利用电镜技术研究美洲黑杨次生韧皮部筛管和伴胞发育过程中细胞超微结构的动态变化，观察到筛管和伴胞由同一个次生韧皮部衍生细胞分裂分化形成筛管约发育历经未成熟期、成熟期和衰退期的变化未成熟期筛管分子表现为细胞的径向扩展、壁的增厚、筛管质体和P-蛋白质的产生；成熟期筛管分子细胞组分发生选择性自溶，细胞核核质弥散状，核膜不清晰，或核膜清晰而核物质降解，最后细胞核完全解体转化为P-蛋白质类的物质；衰退期筛管分子细胞质完全解体消失，失去功能。

It is concluded that (1) there are no relationships between fusion rate and relativeness of the recipient cytoplasm to nucleus donor cells,(2) cytoplast of the goat MII oocyte can support the preimplantation development of SCNT embryos reconstructed with nucleus from other species,(3) the blastocyst rate of close relative inter-species SCNT embryos is higher than that of distant relative inter-species SCNT embryos.

由此结果得出以下结论：(1)山羊M II期卵母细胞胞质与供核细胞之间的亲缘性不影响两者的融合率；(2)山羊M II期卵母细胞的胞质能支持异种间体细胞核移植胚的着床前发育；(3)亲缘关系近的种间核移植胚的囊胚发育率高于亲缘关系远的种间核移植胚的。

Using the methods of classical shape size measuring and chromosome analysis, we studied the morphological characters and Karyotype of Cobitis sinensis in Xiangjiang River. We also investigated the evolution line and Karyotype polymorphism of the C . sinensis by the methods of cytological classification and cytocatalytic. Our results suggest that the formation of chromosome polymorphism was concerned with heterologous hybridization and some of C . sinensis may perpetuate in a clonal manner by natural gynogenesis.

本文以湘江流域的中华花鳅为研究对象，运用经典的形态测量观察方法、染色体制片技术对中华花鳅的形态生态特征、染色体组型进行了初步研究：运用细胞分类和进化方法对中华花鳅的核型演化和核型多态现象的形成进行了分析，提出：其核型多态的形成牵涉到鳅科鱼类的异源杂交，某些中华花鳅可能是行雌核发育生殖的。

Conversely,if the heartland complex were capable of deterring a nuclear attack by possession of equal or superior nuclear systems ,its then corresponding influence over its non-nuclear or nuclear-inferior rimland neighbors would be correspondingly greater.

相反，如果受打击的中心地区的防护掩体拥有能够抵御一次核打击的相同或更高级的核保障系统的话，那么其对于无核或核落后的相邻地区的造成的相应的压力会比拥有核打击更大。

After nucleosides were extracted from urine on phenyl boronic acid affinity chromatography, the analysis was performed on a column (46 mm id×250 mm, 5 μm) at 22 ℃ using a linear gradient elution comprising 25 mmol/L KH2PO4 solution (pH 455) and 60% methanol in water with UV detection at 260 nm.

用该法测定了41例肠癌患者和52例正常人尿中15种核苷的含量(用核苷与肌酐的摩尔比表示，下同)，结果表明肠癌患者中有12种核苷的含量比正常人显著性增高(P 001)。以15种核苷的含量作为参量，结合主成分分析区分正常人和肠癌患者，对癌症病人的识别率达76%(31/41)。

In this project,by using the primitive eukaryotic cell Giardia lamblia as materials,the relationship between lamina and nuclear division, and the origin and evolution of lamin family and were studied.

本课题旨在从起源进化的角度出发，以相对简单和原始的真核生物贾弟虫为材料，探讨核纤层在该原始细胞中的成分和基因，及其与核分裂的关系，还有核纤层蛋白家族的起源进化规律。

The connection with other nucleis of the pallial thickening were studied by retrograde tracer horseradish peroxidase and fluorescent tracer dextran tetramethylrhodamine, Fluoro-ruby.

本研究采用Nissl染色法、golgi -cox法、神经元逆行追踪标记辣根过氧化物和逆行荧光染料葡聚糖四甲基罗丹明方法，分析了蛤蚧皮质加厚区的核团长度、核团体积、细胞大小、细胞形态、细胞密度、初步的亚区分区以及核团的纤维联系，为阐明爬行动物-蛤蚧的视觉通路核团的特征和纤维联系积累形态学和组织学资料。

The function of bone resorption by MGC was examined with coculture of bone slice and MGC. The resorption lacunae were examined with a scanning electron microscope. The activity of acid phosphatase in MGC was observed by Gomori stain. Results: MGCs showed multinuclei (more than 20 nuclei), irriegular peripheral cytoplasm with pseudopodial projections, vacuoles were seen in the cytoplasm.

用倒置相差显微镜观察体外培养的多核巨细胞的一般形态及降钙素对它的影响；用骨片与多核巨细胞共同培养法观察多核巨细胞的体外骨吸收功能，用扫描电镜观察骨吸收陷窝，Gomori染色观察多核巨细胞的酸性磷酸酶活性。

The karyotype of the genus Lycoris has great variation,we find some new karyotypes and new chromosome number by meticulous cytological analysis, especially in Lycoris radiata which karyotypes exist tremendous variation even in different population.

石蒜属植物的染色体核型变异很大，通过细致的核型分析，发现了许多新的核型和染色体数目；其中石蒜在不同居群中的核型存在巨大的变异。

Rabbits were equipped with intracerebral cannulae directing to two of the four nuclei.

我们在研究吗啡的中枢作用部位时发现，注射微量吗啡到家兔或大鼠的PAG、伏核、杏仁核或缰核内，可产生明显的镇痛作用；而将阿片受体阻断剂纳洛酮注入上述任一核团内，则能大部取消静脉注射吗啡产生的镇痛或电针引起的镇痛。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。