生物学

Spermatogonial stem cells have special behavior and features,based on these ,we can indentify the spermatogonial stem cell in vitro.

精原干细胞具有典型的生物学行为和特征，结合行为及生物学特征可对增殖的精原干细胞进行鉴定。

Objective:To study the biological features of mouse spermatogonial stem cells,in order to indentify spermatogonial stem cells and to realize the features in vitro.

目的：探讨培养状态下精原干细胞的生物学特征，为体外鉴定精原干细胞及认识精原干细胞在体内的生物学行为打下实验基础。

In vitro culture of spermatogonial stem cells is a basic technology of biology ,which can promote the biology investigation of spermatogonial stem cells . So spermatogonial stem cells in vitro culture has become one of the hot fields in the Biology of the Stem Cell in recent years .

精原干细胞（Spermatogonial Stem Cells ， SSCs）的体外培养是开展研究精原干细胞生物学的一项最基本的生物技术，近年来成为干细胞生物学研究的热点领域之一。

In order to settle such predicament, the author put forward a new idea that research of TCM may be carried out as Systems biology. To take tumor as an example, tumors occur, then develop into a big one, during which experiences a multifactorial 、multifactorial processes, so Tumor Systems biology typifies holistic、kinetic、stratose and integrate characters.

文章以肿瘤系统生物学的研究思路与中医肿瘤学理论的结合点为线索，从肿瘤的发生、中医的调整阴阳的治则、现代医学的靶向治疗及肿瘤诊治的医学信息等方面为切入点对肿瘤系统生物学建立及其与中医理论结合的可行性与必要性作一初步探讨。

Results The cerebral ischemia may augment the proliferation and differentiation of NSC in the subventricular zone and subgranular zone of hippocampus and,might improve neural self-repair after ischemic insults.

NSC的增殖、分化潜能，使其可以作为新生神经细胞的&种子&，为脑缺血等中枢神经系统( centralnerve system，CNS)疾病的治疗性再生和基因治疗提供了可能。1 NSC的生物学特性NSC具有以下生物学特征：( 1 )自我维持和自我更新的能力；( 2 )多方向分化潜能，能分化本系大部分类型的细胞；( 3)增殖分裂能力，能无限的增殖分裂而产生大量的后代

Susumu Tonegawa, a professor of biology and neuroscience at the Massachusetts Institute of Technology (and 1987 Nobel laureate in Physiology or Medicine), has been for more than a decade investigating the region's role in forming memories.

十几年以来，麻省理工学院的神经生物学教授利根川进（ Susumu 利根川进，1987年生物学与医学诺贝尔奖获得者）一直在研究这个特别区域，研究它在进行记忆与讯息贮存中所发挥的作用。

Gene introgression is usually resulted from spontaneous hybridization occurring among closely related species in sympatric populations and thus has great impact on genetic structure of natural populations.

同域分布的近缘物种常常发生杂交而导致种间基因渐渗，从而对相关物种的自然居群遗传结构产生重要影响，近缘种间的杂交渐渗已成为进化生物学和保护生物学关注的热点。

Results Based on morphological characteristics, biological characteristics and phylogenetic evidences, we studied the taxonomy of the strain YY0801 isolated from Phytomia zonata (Diptera: Syrphidae).

从黄道蚜蝇昆虫体内分离到螺原体YY0801，并对其进行了形态学、基本生物学及分子生物学特性研究。

Granule-bound starch synthase is an enzyme binding on starch granule in plant cells, whose function is keeping amylase unbranching.

多年来，人们一直想利用普通遗传学和分子生物学手段降低GBSS的生物学活性从而改良小麦品质。

Furthermore, preliminary work also performed to examine whether PI3K/AKT signal transduction pathway was activated in the process of refractory leukemia development. Materials and methods An immortalized human bone marrow stromal cell line, HS-5, was introduced to establish a bi-phase culture system for the cultivation of B-lineage precursor leukemia cells. ELISA and RT-PCR were used to investigate the expression of VEGF and its receptors in the leukemia cell lines and primary childhood leukemia cells in different treated groups. Flow cytometory method and immunofluorescent staining were employed to examine the apoptosis signals both in the VP16 treated and untreated leukemia cells. Western blot was utilized to explore the PI3K/AKT activated status in the drug induced or uninduced leukemia cells and lymphocytes from healthy donors.

材料和方法使用来源于人类骨髓基质细胞的细胞株HS-5作为滋养层细胞进行急性淋巴细胞性白血病细胞的体外培养，通过细胞生物学和免疫学方法评估培养体系并鉴定出难治性白血病细胞克隆；以ELISA和RT-PCR方法检测急性白血病细胞株和患儿白血病细胞VEGF及其受体的表达，了解不同治疗阶段VEGF及其受体的表达状况，并结合临床指标进行分析，明确VEGF及其受体在白血病发生过程中的作用；流式细胞仪和免疫荧光染色法对正常健康儿童、初发白血病患儿、复发白血病患儿及缓解后患儿进行凋亡因子检测和分析，初步阐明难治性白血病抗凋亡形成的原因；蛋白印记分析检测PI3K/AKT信号传导通路在健康儿童、初发白血病和复发白血病患儿的表达，初步了解难治性白血病形成的分子生物学机制。

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。