Analysis of a Class of Symmetric Equilibrium Configurations for a Territorial Model

<正>Motivated by an animal territoriality model,we consider a centroidal Voronoi tessellation algorithm from a dynamical systems perspective.In doing so,we discuss the stability of an aligned equilibrium configuration for a rectangular domain that exhibits interesting symmetry properties.We also demonstrate the procedure for performing a center manifold reduction on the system to extract a set of coordinates which capture the long term dynamics when the system is close to a bifurcation.Bifurcations of the system restricted to the center manifold are then classified and compared to numerical results.Although we analyze a specific set-up,these methods can in principle be applied to any bifurcation point of any equilibrium for any domain.     

Establishment of a Tumor-bearing Mouse Model Stably Expressing EGFP Labeled Human MUC1 VNTRs

Two eukaryotic vectors expressing 9 tandem repeats of human MUCI（VNTR）, VR1012-VNTR, and pEGFP-VNTR, were constructed by cloning VNTR gene into VR1012 and pEGFP, respectively. VNTR stably expressing murine Lewis lung carcinoma（LLC） cell line（VNTR^＋ LLC） was established by Lipofectamine-mediated transfection of pEGFP-VNTR into LLC cells. The EGFP expression was observed under a fluorescent microscope and VNTR expression in VNTR^＋ LLC cells was confirmed by means of Western blotting. A syngenic graft tumor model was generated by subcutaneous injection of VNTR^＋ LLC cells into C57/BL6 mice and tumor size increased rapidly with time and in a cell qumber dependent manner. VNTR mRNA expression in the tumor formed was confirmed by RT-PCR. After the third immunization mice were challenged subcutaneously with 5×10^5 VNTR^＋ LLC cells, a significant reduction of subcutaneous tumor growth was observed in the groups immunized with VNTR plasmid DNA compared with that in the groups immunized with the vector DNA alone. Thus, the suppression of subcutaneous tumor was antigen-specific. This model is useful for the development of tumor vaccines targeting MUCI VNTRs.     

光学分子成像技术取得新进展

骆清铭、张智红、赵元弟、杨杰、罗若愚等人完成的“用于药物筛选和药效评价的光学分子成像动态监测理论与方法研究”项目针对在药物筛选与药效评价应用中存在的问题,从系统生物学角度出发,通过探索生物分子信息的建模、仿真与信号处理新理论与新方法,开发多元化的荧光分子探针,建立适合于长时程动态光学成像的细胞网络和实验动物模型,发展高时空分辨、高通量、高灵敏度的光学分子成像技术,形成了从光学分子探针、细胞与动物模型、光学成像监测装置到生物分子信息可视化的理论和技术体系,建立了可用于药物筛选和药效评价的光学分子成像动态监测平台。     

微量元素、抗氧化剂与湿热证的相关性的研究

建立了温病湿热证动物模型，研究了清香散对大鼠微旦元素锌（Zn）、硒（Se)、铜（Cu)和维生素E代谢水平，一氧化氮（NO）含量以及谷胱甘肽过氧化物酶（GSH－Px)活力变化的影响，并将正常对照组、湿热模型组、清香散治疗组进行两两比较。结果表明，湿热证模型大鼠血清Zn、Se、维生素E、NO含量显著下降，Cu含量显著升高，GSH－Px活力明显降低，经清热祛湿的经验方清香散治疗后，大鼠血清Zn、Se、维生素E、NO含量及GSH－Px活力明显升高，Cu含量明显下降。抗氧化能力下降是湿热证的本质之一，微量元素锌（Zn)、硒（Se)、铜（Cu)在机体内的含量反映了抗氧化酶活性的高低，清香散能显著提高大鼠血液Zn、Ee、维生素E、NO含量及GSH－Px活力，降低Cu含量，恢复其抗氧化能力。     

环丙烷化反应作为关键反应的生物碱(±)-Minfiensine的全合成

环己烷、四氢吡咯并吲哚骨架3为马钱属(Styychnos)和灯台属(Echitamine)吲哚生物碱的特征骨架, 具有高度复杂的多环稠合体系, 在合成化学上具有显著挑战性. 因此发展一种简便、高效的合成方法构建吲哚骨架3, 对于进一步开展马钱属和灯台属生物碱的全合成具有重要的意义. 通过铜离子催化重氮中间体2发生分子内的环丙烷-开环-环合三步一锅的串联反应, 高效地构建了四环吲哚骨架3. 并以此方法学为基础, 以12步的简短反应, 高效地完成了Minfiensine消旋体的全合成.     

套管构建肾血管性高血压大鼠模型

为了探讨采用套管构建2 K1C肾血管性高血压大鼠模型的可行性,本实验选取SD大鼠60只,分为对照组、假手术组、2 mm手术组及3 mm手术组,两个手术组采用内径为0.3 mm,长度分别为2 mm和3 mm两种自制不锈钢金属套管,对大鼠左肾动脉进行狭窄,构建2 K1C肾血管性高血压大鼠模型并使用尾     

实验性肾型高血压

<正> 本世纪初开始采用影响肾功能的实验方法引起动物产生高血压,如X射线照射肾,切除部分肾组织,阻塞肾动脉的主干或分支,缩小动脉静脉口径等,造成肾源性高血压。直到1934年戈德布拉特(Goldblatt)报导狭窄狗的肾动脉口径,又切除对侧肾后,形成持久性的动脉血压升高和心脏肥大。