118 research outputs found

    Interaction of Human Papillomavirus 16 Major Capsid Protein L1 with HnRNP H1 and its functions

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    流行病学和相关研究证实人乳头瘤病毒(HPV)感染与尖锐湿疣、宫颈上皮瘤样增生和宫颈癌的发生关系密切。HPV感染机体后各种病毒基因的表达是受严格调控的,尤其是晚期基因,在未分化的细胞中几乎不表达,随着细胞分裂,病毒基因组随子细胞上移到表皮上层后,晚期蛋白的表达才被启动。这种分化依赖的晚期蛋白表达调控机制尚不明确。在以往的研究中发现,晚期蛋白在转录后水平受多种负调节元件的控制,其中早期多聚腺苷酸化信号(pAE)在晚期基因的转录后调控中起到核心的作用,它能使mRNA的转录提前终止,在HPV16L2的N端有一个GU含量丰富的序列(GU-richsequence,GRS),是hnRNPH1蛋白结合位点,...It has been confirmed that the infection of HPV is associated with genital warts and various forms of cancer in men and women. Expression of viral gene, especially the late gene, is tightly controlled while these late gene will not expressed in less differentiated cells. Along with cell division, viral genome move upward to the most superficial epithelium layer, and that initiate the late gene exp...学位:理学硕士院系专业:生命科学学院生物学系_生物化学与分子生物学学号:2012005130209

    Design and Implementation of Video Monitoring Client based on Symbian Smart Phone

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    随着经济的发展、人们生活水平的提高,视频监控已经成为社会生活中的热点话题。目前大部分的视频监控系统是基于Web服务器的视频监控系统,监控终端为PC机,通过接入互联网实现远程视频监控。由于互联网接入地点的限制,无法满足用户随时随地获取监控信息的要求。移动通信网络和移动智能终端技术的飞速发展为这一问题的解决创造了条件。 本课题将传统视频监控系统与移动多媒体业务相结合,构建基于智能手机的移动视频监控系统。目前移动通信网络覆盖范围很广,使用手机作为视频监控系统的终端,几乎不受地点的限制,真正实现用户任何时间,任何地点的视频监控。同时手机作为最普及的移动终端设备,有利于移动视频监控向民用市场的推广。 ...Along with the development of economy and the improvement of people’s living standard, the video monitoring has becomed hot topics in social life. Now, most of video monitors are based on the web server, the terminal of video monitoring system is PC, it realizes remote video monitoring through Internet. Because the restriction of Internet accsss point, the requirement of getting the information of...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2005130239

    美国大型制造商2003年第三方物流服务使用情况调查

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    当大型制造商提出供应链战略时,第三方物流服务的使用是他们所要考虑的一个重要选择。第三方物流提供者给这些公司提供了范围广泛的服务,不仅在国内市场,国际市场也是如此。管理者考虑使用这些服务面临着一个复杂的决策,这些涉及到一系列重要的控制与成本、服务改进之间的权衡,必须在迅速变化的第三方物流产业中进行评估。第三方物流产业继续发展,对产业动态的评述便利了公司供应链战略的制定,这对于第三方物流服务提供者和服务的用户都很重要。这一研究洞察了第三方物流市场的用户一方。译者单位:南开大学经济学院经济学系#辽宁大学工商管理学院(300071#110036

    Design of handset software based on the J2ME in long-distance monitor system and its implementation

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    简要介绍了手机软件J2ME开发平台和开发工具,分析了手机远程监控的系统结构和功能实现,着重介绍了远程监控系统中基于J2ME手机客户端软件的编写,包括用户界面设计、网络连接、云台控制、图片显示几个部分的设计与实现,并给出了部分程序流程图及运行演示。This article briefly introduces the J2ME development platform and development kit for handset software,analyzes the structure and the function of handset long-distance monitor system,emphatically introduces the handset client software programming based on J2ME in long-distance monitor system,including the design and realizing of user interface,the network connection,camera control,and the picture displaying.This article also presents some flow chart diagrams and shows the result of program

    牵拉力对共培养的表皮干细胞及成纤维细胞迁移行为的影响

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    背景:创面愈合是一个复杂的动态过程,是细胞之间、细胞与细胞外基质及细胞因子间相互影响和协同作用的结果。另外,大量相关研究表明机械应力可以诱导组织细胞增殖,促进创面愈合。因此创面愈合也是一个典型的力学-生物学耦合过程,但力学刺激促进创面愈合的细胞/分子的调控机制目前尚不清楚。皮肤由多种细胞组成,通过牵张皮肤等在体方法难以区分其中某类细胞对外界力学刺激的单独响应以及

    HepG2细胞中与戊型肝炎病毒衣壳蛋白相互作用蛋白的初步研究

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    利用重组戊型肝炎病毒(HEV)衣壳蛋白片段p239(368~606 aa)形成的类病毒颗粒作为亲和层析诱饵蛋白,HepG2为细胞模型,筛选与p239类病毒颗粒特异性相互作用蛋白。经过二维电泳分离,MALDI-TOF-MS分析鉴定得到GRP78/Bip,HSP90,alpha-tubulin及P43四个与p239有相互作用的候选蛋白。GRP78/Bip为热休克蛋白家族成员,体外免疫共沉淀实验结果证实,其与p239有特异性的结合。此研究结果为深入研究HEV的感染过程如吸附、入胞,以及HEV的致病机理提供了有益线索

    锂氧电池双功能还原石墨烯-LaFeO复合纳米催化剂的制备及性能

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    制备具有氧还原(ORR)与氧释放(OER)双功能催化活性的特殊孔道结构电催化剂是锂氧电池研究的挑战之一。本文以氧化石墨烯、硝酸铁、硝酸镧、柠檬酸为原料,结合溶胶凝胶和水热合成方法,制备出还原氧化石墨烯(RGO)与铁酸镧(LaFeO)复合的双功能催化剂(RGO-LaFeO)。X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱和Raman光谱分析结果确认该复合催化剂由纯相钙钛矿结构LaFeO和还原氧化石墨烯组成,扫描电子显微镜(SEM)观察到LaFeO纳米颗粒均匀地负载在RGO片层表面。锂氧电池测试结果指出,相对于LaFeO纳米粒子(NP-LaFeO),RGO-LaFeO催化剂具有更好的ORR和OER催化活性,归因于RGO特殊的三维导电多孔结构与LaFeO纳米粒子的协同催化作用。以RGO-LaFeO作为阴极催化剂的锂氧电池在限1000 m Ah?g比容量、100 m A?g电流密度条件下,可实现36周稳定的充放电循环,展示出良好的应用前景。国家自然科学基金(21621091);国家重点研发计划(2016YFB0100202)资助项目~~

    Reduced Graphene Oxide-LaFeO3 Composite Nanomaterials as Bifunctional Catalyst for Rechargeable Lithium-Oxygen Batteries

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    制备具有氧还原(ORR)与氧释放(OER)双功能催化活性的特殊孔道结构电催化剂是锂氧电池研究的挑战之一。本文以氧化石墨烯、硝酸铁、硝酸镧、柠檬酸; 为原料,结合溶胶凝胶和水热合成方法,制备出还原氧化石墨烯(RGO)与铁酸镧(LaFeO_3)复合的双功能催化剂(RGO-LaFeO_3)。X射线; 衍射(XRD)、傅里叶变换红外(FTIR)光谱和Raman光谱分析结果确认该复合催化剂由纯相钙钛矿结构LaFe03和还原氧化石墨烯组成,扫描电子; 显微镜(SEM)观察到LaFe03纳米颗粒均匀地负载在RGO片层表面。锂氧电池测试结果指出,相对于LaFe03纳米粒子(NP-LaFeO_3),; RGO-LaFeO_3催化剂具有更好的ORR和OER催化活性,归因于RGO特殊的三维导电多孔结构与LaFeO_3纳米粒子的协同催化作用。以RGO; -LaFeO_3作为阴极催化剂的锂氧电池在限1000 mAh·g~(-1)比容量、100; mA·g~(-1)电流密度条件下,可实现36周稳定的充放电循环,展示出良好的应用前景。Development of electrocatalysts is one of the challenges in the development of the lithium-oxygen battery, especially the synthesis of catalysts with special pore structures and excellent bifunctional catalytic performance for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). In this article, a reduced graphene oxide-LaFeO3 (RGO-LaFeO3) nanocomposite electrocatalyst was synthesized by combining sol-gel and hydrothermal methods and using graphene oxide, lanthanum nitrate, ferric nitrate, and citric acid as raw materials. The prepared samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy. The results confirmed that the RGO-LaFeO3 was composed of pure phase LaFeO3 with a perovskite structure and RGO and that the LaFeO3 nanoparticles were loaded uniformly on the RGO layer surface. In comparison with a LaFeO3 nanoparticle (NP-LaFeO3) catalyst, RGO-LaFeO3 exhibited superior activity for both the ORR and the OER when it served as the cathode of a lithium-oxygen battery. The higher catalytic activity of the RGO-LaFeO3 is attributed to the synergistic effect of the special three-dimensional electronic conductive structure of RGO and the intrinsic catalytic property of LaFeO3. It was shown that the lithium-oxygen battery with the RGO-LaFeO3 cathode can be cycled stably up to 36 reversible cycles under conditions of a limit discharge depth of 1000 mAh.g(-1) and a 100 mAg(-1) current density for charge-discharge. The study illustrates that the RGO-LaFeO3 bifunctional electrocatalyst is a promising candidate for the cathode in lithium-oxygen batteries.National Natural Science Foundation of China [21621091]; National Key; Research and Development Program of China [2016YFB0100202

    Impacts of surface micro-topography on cellular biological responses

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    与常规的细胞体外培养器皿不同,细胞在体内生长时,其微环境并不是简单的平面形式,每一种组织都有其特定的三维微结构。这类具有微结构的微环境是细胞生长、分化的重要调控因子。近年关于基底微拓扑结构影响细胞生长、分化等行为研究的文献迅速增加,研究发现,具有微拓扑结构的基底可改变细胞的铺展、迁移、取向等行为,引导细胞骨架的重排,调控干细胞分化潜能,对于体外组织构建以及医学植入材料的表面处理具有指导性意义。本文就有关基底微拓扑结构影响细胞生物学研究的最新进展进行了综述
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