Study on the changes of nuclear matrix proteins during the apoptosis of the immortalized human epithelial HaCaT cells with curcumin treatment

本文在鉴定姜黄素（curcumin,Cur）诱导人永生化表皮HaCaT细胞凋亡的基础上，应用选择性抽提整装透射电镜和蛋白质组学分析技术，对HaCaT细胞诱导凋亡过程中核基质-中间纤维系统的构型变化和核基质蛋白组成的变化进行系统研究。分析鉴定与表皮细胞凋亡相关的特异核基质蛋白，并探索它们在表皮细胞凋亡过程中的调控作用，以期能够在较为整体的水平上进一步认识表皮细胞凋亡及其机理，从而找出表皮细胞凋亡研究的新方向。 实验结果显示，经7.5μg/mL姜黄素处理之后，人永生化表皮HaCaT细胞的增殖受到明显抑制，细胞生长抑制率达83.03％；细胞周期检测出现亚二倍体（亚G1期）细胞峰值，细胞凋亡率达13...In this study, the curcumin(Cur) was used to induce the immortalized human epithelial cell line HaCaT cells into apoptosis, and its effects were investigated by selective extraction-whole mount optic and transmission electron microscopy and techniques of proteomic. The differentially expressed nuclear matrix proteins were analyzed in order to explore the molecular mechanisms in a system level. ...学位：理学硕士院系专业：生命科学学院生物学系_细胞生物学学号：2012005130207

The Internationalization Of Indian SMEs In B-to-B Markets

Purpose – The study aims to examine the effect of market orientation on the international performance of Indian SMEs in the business-to-business market; assess the potential moderating effect of environmental uncertainty, along with market orientation, on SMEs’ performance; and discuss implications to guide SME owners/managers in their efforts to successfully expand internationally in turbulent markets. Design/methodology/approach – Surveys were sent to a random cross-sectional industry sample of SMEs located in India. The data consisted of 150 responses. Findings – Market orientation and international orientation are positively related to export performance and the relationship between the market orientation and international performance of Indian SMEs is moderated by market turbulence. Research limitations/implications – The data were collected at a single point in time, and therefore do not allow the determination of cause and effect or the impact of changes over time. Data were collected with a reliance on self-reports for all of the research variables. Practical implications – The positive relationship between market orientation, international orientation, and the degree of internationalization of the firm would suggest that the upper management of Indian SMEs should place a priority on promoting behaviors consistent with a positive international orientation, especially in turbulent markets. Originality/value – Studies focused on market orientation have been done primarily in the context of advanced economies. The significant economic contribution of SMEs is well understood, but their business practices in emerging economies have not been studied extensively. This study extends the literature concerning factors that impact business success in an important emerging market such as India

Study on Corrosion Resistance of Zr-0.8Sn-1Nb-0.3Fe Alloy after Kr~+ Ion Irradiation

采用高压釜腐蚀实验研究了2种不同制备工艺下的Zr-0.8Sn-1Nb-0.3Fe合金(1#,2#)经360℃、5~25; dpa的Kr~+辐照后、在400℃/10.3 MPa过热蒸汽中的耐腐蚀性能,用透射电子显微镜(TEM)、扫描电镜(SEM)、; X射线衍射仪(XRD)分析合金腐蚀后氧化膜显微组织结构。结果表明,100; d腐蚀后,合金的腐蚀增重随着辐照剂量的增加而增加,由于1#合金中的第二相比2#合金更为细小、弥散,相同辐照剂量下,前者的腐蚀增重较低。腐蚀转折前; ,从蒸汽腐蚀侧到锆合金基体,氧化膜中的氧含量逐渐降低,靠近蒸汽侧的氧化膜主要由等轴晶形态的单斜ZrO_2组成,而基体界面处的氧化膜主要为柱状晶形; 态的四方ZrO_2和六方Zr_3O;腐蚀转折后,基体界面处的氧化膜呈"花菜"状生长,"花菜"尺寸大小与氧化膜生长速率的高低及不均匀生长趋势的大小; 呈对应关系。The corrosion resistance of Zr-0.8Sn-1Nb-0.3Fe alloys prepared by two; different processes was investigated in 400℃/18.6MPa superheated steam; by static autoclave after irradiated by 360℃ with Kr~+-irradiation of; 5~25 dpa. The microstructures of oxidation film after corrosion were; analyzed by TEM, SEM, and XRD. The results showed that the corrosion; weight-gain increased with the irradiation dose, while the weight-gain; of 1# alloy with smaller and more dispersive SPPs than 2# alloy was; lower under the same irradiation dose. Before corrosion turning, the; oxygen content in the oxidation film decreased from the steam-side to; the zirconium matrix. The oxidation film beside the steam-side was; mainly composed by equiaxied monoclinic ZrO_2 crystal, while near the; film/matrix interface by columnar quartet ZrO_2 crystal and hexagonal; Zr_3O crystal. After transition of corrosion weight, the film near the; interface grew like cauliflowers, and the size of cauliflowers were; corresponded to the growth rate and uneven growth trend of oxidation; film

Research of Artificial Neural Network Arithmetic Based on FPGA

[中文文摘]基于FPGA的神经网络实现方法已成为实际实时应用神经网络的一种途径。本文就十多年来基于FPGA的ANN实现作一个系统的总结,例举关键的技术问题,给出详细的数据分析,引用相关的最新研究成果,对不同的实现方法和思想进行讨论分析,并说明存在的问题以及改善方法,强调神经网络FPGA实现的发展方向和潜力及提出自己的想法。另外,还指出基于FPGA实现神经网络存在的瓶颈制约,最后对今后的研究趋势作出估计。[英文文摘]FPGA implementation of Artificial Neural Networks(ANNs)has been an approach of actual real-time neural network.This paper systematically reviews the progress that has been made in this research area over a decade,and lists the typical technology issues,shows detailed data analysis and newest research results,Simultaneously different implementation techniques and design are discussed,then existing problems and realizition constrains can be presented as well as improvement solutions,the development direction and potential of FPGA implement of ANN are proposed.Eventually future developments are expected.大学生创新性实验项目(2007年78号

相界面对双相钛合金层裂孔洞形核的影响

利用一级轻气炮对TC4双相钛合金进行加载,获得初期的层裂状态,在加载中采用多普勒激光干涉测速技术对样品自由面粒子速度进行测试。在软回收经过加载的样品之后,借助于金相显微镜、X射线断层扫描、纳米压痕等检测手段进行多维分析,探讨了相界面对孔洞形核位置的影响。结果表明,孔洞绝大部分都在α相内形核,而不是如准静态损伤理论预测的形核于α/β相界面。这是由于相界面的反射与透射作用,当冲击波从高阻抗α相传入到低阻抗β相时,会在α相内产生拉伸脉冲,当拉伸脉冲足够大时,导致在α相内产生孔洞

Apoptosis of Human Esophageal Carcinoma Cell Line EC9706 Induced by Curcumin

目的:应用姜黄素处理人食管癌EC9706细胞,研究姜黄素对人食管癌EC9706细胞凋亡的诱导作用。方法:应用细胞计数、流式细胞仪、琼脂糖凝胶电泳、Hoechst染色、H.E染色和透射电镜检测经姜黄素诱导处理后人食管癌EC9706细胞的凋亡。结果:经姜黄素诱导处理后,人食管癌EC9706细胞生长抑制率达69.9%;细胞周期检测出现亚二倍体(亚G1期)细胞峰值,细胞凋亡率达23%;琼脂糖凝胶电泳显示出细胞凋亡典型的180-200 bp及其倍体的DNA"梯状"条带;Hoechst染色显示细胞核内出现浓染致密的固缩形态或颗粒状荧光;光镜和电镜下可见典型的细胞凋亡特征:细胞体积缩小,染色体凝集,可见有成群或单独存在的凋亡细胞,电镜下可见凋亡小体存在。结论:姜黄素能够有效诱导人食管癌EC9706细胞的凋亡,从而进一步为食管癌等恶性肿瘤疾病的治疗和凋亡机理的研究提供重要基础和科学依据.Objective: To study the apoptosis effects of the human esophageal carcinoma cell line EC9706 cells induced by curcumin(Cur). Methods: The apoptosis effects of EC9706 cells induced by curcumin were detected by cell count, flow cytometry analysis, light microscope and electron microscope. Results: After treated with curcumin, the proliferation of EC9706 cells was inhibited, and the inhibitory rate was 69.9%. The results of flow cytometry analysis showed that curcumin could induce the emergence of the phase of apoptosis, and the rate was 23%. Agarose gel electrophoresis revealed that cell DNA fragment exhibited characteristic "DNA ladder".Cell nucleus concentrated and appeared granular fluorescence by Hoechst33258 staining. Light microscope and electron microscope showed that the morphology of the cells treated with curcumin appeared shrinked, cell nucleus concerntrated, chromatin agglutinated, mitochondria swelled, and apoptosis body formed. Conclusion: This study suggested that curcumin could induce apoptosis of the human esophageal carcinoma cell line EC9706 effectively, and provided important foundation and research proofs to study more about the therapy of esophageal carcinoma, the malignant tumor and apoptosis mechanisms.国家自然科学基金项目(30470877

Expression and Localization of Nucleophosmin During Curcumin-induced Apoptosis in the Immortalized Human Epithelial HaCaT Cells

该文以姜黄素诱导处理前后的人永生化表皮HACAT细胞为研究对象,对核仁磷酸蛋白(nuClEOPHOSMIn,nPM)在核基质中存在、分布及其与凋亡相关基因产物在姜黄素处理前后HACAT细胞中的共定位关系进行观察研究。WESTErn blOT结果显示,nPM存在于人永生化表皮HACAT细胞核基质蛋白组分中,并在姜黄素处理后的细胞核基质中表达下调,免疫荧光显微镜观察显示,nPM定位在核基质上,经姜黄素处理后出现分布位置与表达水平的变化,激光共聚焦显微镜观察可见nPM与HACAT细胞中凋亡相关基因bAX、bCl-2、MTP53和rb基因产物均存在共定位关系,但在姜黄素处理后细胞中其共定位分布区域出现变化。研究结果证实nPM是一种核基质蛋白,定位于核基质上,nPM在HACAT细胞诱导凋亡过程中的表达分布及其与凋亡相关基因产物的共定位现象值得进一步探索和研究。To explore the existence and distribution of nucleophosmin(NPM) in the nuclear matrix and its colocalization with the other apoptosis-related gene products following curcumin treatment in the human epithelial HaCaT cells,the nuclear matrix of HaCaT cells was extracted pre/post curcumin induced apoptosis.Western blot analysis showed that NPM existed in the fractions of nuclear matrix proteins and was down-regulated after curcumin treatment.The immunofluorescence observation revealed that NPM located in the nuclear matrix,curcumin treatment altered its expression level and distribution profile.The colocalization of NPM with the products of apoptosis-related repression genes,including Bax,Bcl-2,mtP53 and Rb,using laser scanning confocal microscopy,were evaluated,and substantial differences were observed following curcumin treatment.The results implied that NPM is a nuclear matrix protein,and the level of its expression and the colocalization with apoptosis-related gene products may play an important role during the apoptosis of HaCaT cells.国家自然科学基金(批准号:30871241)资助的课题~

Progress of C_2-Symmetric Biphenyl Bisphosphine Ligands Ⅲ

手性膦配体的合成及其在手性诱导催化反应中的应用一直是不对称合成与催化研究中非常重要的研究领域之一。近10年来,大量的C2-轴对称手性双膦配体被合成出来并成功地应用于不对称催化研究,本文从C2-轴对称联苯类手性双膦配体的介绍、合成方法、C2-轴对称联苯类手性双膦配体在不对称催化氢化、以及其在其他不对称诱导反应中的应用4个方面综述了相关研究进展,并对今后配体的合成及应用前景进行了展望。A vast number of biphenyl atropisomeric diphosphine ligands are successfully applied in asymmetric catalysis.The synthesis and applications of this type of ligands are a continuous interesting theme in organic chemistry.This review describes recent progress in synthesis and application of C2-Symmetric diphosphine ligands on the asymmetric catalysis hydrogenation and other asymmetric induced reaction,and the future ligand synthesis and application prospect.国家自然科学基金(20272037); 教育部博士点基金(20080610022); 四川自然科学基金重点项目(07ZA109

Progress of C_2-Symmetric Biphenyl Bisphosphine LigandsⅡ

手性膦配体的合成及其在手性诱导催化反应中的应用一直是不对称合成与催化研究中非常重要的研究领域之一。近十年来,大量的C2-轴对称手性双膦配体被合成出来并成功地应用于不对称催化研究,本文从C2-轴对称联苯类手性双膦配体的介绍、合成方法、C2-轴对称联苯类手性双膦配体在不对称催化氢化以及其在其他不对称诱导反应中的应用4个方面综述了相关研究进展。A vast number of biphenyl atropisomeric diphosphine ligands have been successfully applied in asymmetric catalysis.The synthesis and applications of this type of ligands are a continuous interesting theme in organic chemistry.This review describes recent progress in synthesis and application of C2-Symmetric diphosphine ligands on the asymmetric catalysis hydrogenation and other asymmetric induced reaction.国家自然科学基金(20272037); 教育部博士点基金(20080610022); 四川自然科学基金重点项目(07ZA109

Progress of the Study on C_2-symmetric Biphenyl Bisphosphine Ligands(一)

手性膦配体的合成及其在手性诱导催化反应中的应用一直是不对称合成与催化研究中非常重要的研究领域之一。近10年来,大量的C2-轴对称手性双膦配体被合成出来并成功地应用于不对称催化研究,本文从C2-轴对称联苯类手性双膦配体的介绍、合成方法,C2-轴对称联苯类手性双膦配体在不对称催化氢化,以及其在其他不对称诱导反应中的应用4个方面综述了相关研究进展,并对今后配体的合成及应用前景进行了展望。A vast number of biphenyl atropisomeric diphosphine ligands are successfully applied in asymmetric catalysis.The synthesis and applications of this type of ligands are a continuous interesting theme in organic chemistry.This review describes recent progress in synthesis and application of C2-Symmetric diphosphine ligands in the asymmetric catalysis hydrogenation and other asymmetric induced reaction.And the future ligand synthesis and application are predicted.国家自然科学基金(20272037); 教育部博士点基金(20080610022); 四川自然科学基金重点项目(07ZA109