181 research outputs found

    The regulation of CDK3 and its relevance in the pathogenesis of Alzheimer’s Disease

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    阿尔茨海默病(Alzheimer’sDisease,AD)是一种以进行性记忆丧失和认知功 能障碍为主要特征的神经退行性疾病。阿尔茨海默病的最主要病理特征表现为胞 外β淀粉样蛋白聚集形成的老年斑以及神经元细胞内高度磷酸化的微管相关蛋 白Tau蛋形成的神经元纤维缠结。AD中神经元的死亡缺失是导致该疾病发生的 最终原因,关于AD中神经元凋亡机制的研究一直是该领域的热点。由于神经元 的不可再生性,神经元一旦死亡将无法弥补和挽救。最近的研究表明AD病人大 脑神经元的细胞周期会被重新激活,而如果处于终极分化的神经元重新进入细胞 周期,神经元将走向死亡而不是增殖。但关于AD中神经元细胞周期异常...Alzheimer’s Disease (AD) is a progressive neurodegenerative disorder of the central nervous system characterized by progressive cognitive impairment and memory loss. Two main pathologic features of AD are extracellular deposition of the amyloid β peptide(Aβ) formed senile plaques and intracellular neurofibrillary tangles(NFT) consisting of hyperphosphorylated microtub...学位:理学硕士院系专业:医学院_微生物学学号:2452011115341

    The Affect of New Consolidated Financial Statement Standards on Earnings Management

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    在世界经济一体化以及企业合并浪潮的影响下,近年来,我国企业合并日益增多,这使会计信息使用者对合并财务报表的编制提出了更高的要求。合并财务报表,是指反映母公司及其全部子公司形成的企业集团整体财务状况、经营成果和现金流量的财务报表。由于我国旧准则对企业合并财务报表的相关规定存在相当大的漏洞,因此我国上市公司合并财务报表会计信息失真的现象十分严重,甚至成为企业管理当局进行盈余管理的重要手段。针对这一问题,我国新会计准则参照美国财务会计准则与国际会计准则,对原有合并财务报表准则进行了多处重大修改,旨在尽量避免企业管理当局利用合并财务报表进行盈余管理,以保证会计信息质量。 以往我国对于合并财务报表与盈...In recent years, under the influence of economic integration, business com- bination in China is growing rapidly, which makes the accounting information users require high qualified consolidated financial statements. Consolidated financial statements should reflect the overall financial condition, operating results and cash flows of the enterprise group, including parent company and all of its sub...学位:管理学硕士院系专业:管理学院会计系_会计学学号:1752007115112

    镓在抗菌方面的研究进展

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    抗生素发现\"黄金时代\"的结束以及日趋严重的抗生素耐药性问题给我们留下一个戏剧性的、缺乏新型药物来防治耐药病原体感染的难题。这使得从现有非抗生素药物中筛查抗菌活性药物成为一种新尝试。近期研究表明:美国食品药品监督管理局(FDA)批准的、本来用于治疗高血钙的药物硝酸镓具有良好的抗菌活性。不同于其他抗生素,镓的药理性质依靠化学拟态,它可以在目标酶分子中取代铁,从而干扰、扰乱细菌含铁蛋白的功能及细菌代谢,无论是在体外实验还是在体内实验中,镓对多种病原体,包括多重耐药病原体都表现出杀菌活性。因此一些含镓制剂有望被开发成有潜力的非传统抗菌药物,帮助治疗多重耐药细菌感染。国家自然科学基金(No.81673242、No.81473251、No.31741006、No.31370166和No.81301474);;福建省自然科学基金(No.2014J01139和No.2015J01345);;厦门大学校长基金(No.20720160060

    Construction of expression vector of HCV NS4B and its effect on cell apoptosis

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    目的 构建丙型肝炎病毒(HCV)2a型非结构蛋白4B(NS4B)的真核表达载体,并观察其对骨肉瘤细胞U2OS凋亡的影响。方法 以质粒PJFH1为模板,通过PCR反应扩增4目的基因片段,采用同源重组法与PCMV-tag2b载体相连,转化大肠杆菌感受态DH5α,筛选正确的克隆。以脂质体为介导转染U2OS细胞,通过Western blot检测NS4B蛋白的表达,免疫荧光检测细胞的凋亡。结果 构建pCMV-tag2b-NS4B重组质粒,经测序其与NCBI公布的序列完全一致,并可在U2OS细胞中表达,DAPI检测显示细胞凋亡率为(17.25±2.95)%,对照组凋亡率为(6.53±2.36)%。结论 成功构建NS4B的真核表达载体,并可在U2OS细胞中表达,诱导细胞凋亡。山西省自然科学基金(No:2014021037-9); 山西省高等学校大学生创新创业训练项目(No:2014052); 山西医科大学汾阳学院科技发展基金(No:2016B02

    重症与轻症登革热 B 细胞反应动态变化及差异

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    【目的】探讨登革病毒I型(DENV-1)感染时,机体B细胞和浆细胞随病程的动态变化及其与疾病严重性的关系,为重症登革热的早期预警或治疗提供可能依据。【方法】选择2014年9月至12月登革热住院病例62例,设轻症登革热组(DF,n=33)、重症登革热组(SD,n=29)及对照组(control,n=6)。采用多色流式细胞技术分析患者急性期及极期的外周血中B细胞及浆细胞随病程的动态变化及其在重症和轻症组的差异。进一步通过系列样品分析同一感染者(包括轻症和重症各3例)浆细胞随病程的变化,并且观察登革病毒初次及二次感染时,B细胞及其亚群即初始B细胞、记忆B细胞和浆细胞的变化。【结果】重症组B细胞扩增明显高于轻症组(=0.013),特别是在病程第5~6天(=0.017,0.002)。轻症组和重症组浆细胞与对照组相比均有明显的增殖(=0.011,0.032),但轻症和重症两组间相比差异无统计学意义。同一感染者系列样品分析显示,轻症病例浆细胞在病程第7~8天达高峰,第10天基本恢复正常。重症病例在病程第7~9天达高峰,但在病程10d后仍有一定量的增殖。对于轻症登革热,二次感染组表现出更明显的B细胞增殖、初始B细胞减少及记忆B细胞减少(=0.028,0.010,0.037),但浆细胞变化未体现出差异。而对于重症登革热,在二次感染时仅初始B细胞明显减少(=0.018)。【结论】DENV-1血清型感染时轻症和重症登革热组B细胞反应呈现不同的趋势。宿主在病程早期B细胞的明显扩增以及浆细胞延迟反应可能与疾病严重性相关

    An Investigation of AIDS-related Knowledge and Reactions among College Students in China.

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    A total of 251 Chinese college students from Shanghai (31 males, 88 females) and Guangzhou (59 males, 73 females) completed a series of scales concerning AIDS related knowledge, affective feelings and attitude toward PWA, discomfort of contact with PWA, perceived responsibility of contracting AIDS, and support of coercive polices. Results showed that college students (a)had misconceptions about casual contagion of AIDS, independent of correct beliefs about AIDS, (b) expressed significant negative feelings toward PWA, (c) expressed discomfort of contact with PWA, (d) did not support coercive policies upon PWA ; (e) did not think it was PWA&rsquo;s responsibility to contract AIDS; and that (a) compared with college students from Guangzhou, those from Shanghai were more knowledgeable of AIDS and exhibited less negative feelings, negative attitude toward PWA and attributed less responsibility to PWA for their contracting of AIDS; and (b) it was misconception about casual contagion of AIDS but not correct beliefs about AIDS that was consistently predictive of negative reactions toward PWA. These findings call for strong efforts in disseminating AIDS related knowledge, particularly what can&rsquo;t cause AIDS, and eliminating negative reactions towards PWA among college students in China, especially students in Guangzhou area.</p

    Photochemical route for synthesizing atomically dispersed palladium catalysts

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    该工作由校内外多个课题组共同努力,历时三年多完成。我校郑南峰、傅钢等课题组紧密协作负责催化剂的合成、表征、催化测试及机理研究;中科院物理研究所谷林研究员主要负责催化剂的球差校正透射电子显微研究;加拿大达尔豪斯大学的张鹏课题组参与催化剂的同步辐射X-射线吸收谱研究。该研究工作的第一、二作者刘朋昕、赵云均为我校博士生。【Abstract】Atomically dispersed noble metal catalysts often exhibit high catalytic performances, but the metal loading density must be kept low (usually below 0.5%) to avoid the formation of metal nanoparticles through sintering. We report a photochemical strategy to fabricate a stable atomically dispersed palladium–titanium oxide catalyst (Pd 1 /TiO2 ) on ethylene glycolate (EG)–stabilized ultrathin TiO2 nanosheets containing Pd up to 1.5%.The Pd 1 /TiO2 catalyst exhibited high catalytic activity in hydrogenation of C=C bonds, exceeding that of surface Pd atoms on commercial Pd catalysts by a factor of 9.No decay in the activity was observed for 20 cycles. More important, the Pd 1 /TiO2 -EG system could activate H2 in a heterolytic pathway, leading to a catalytic enhancement in hydrogenation of aldehydes by a factor of more than 55.Supported by Ministry of Science and Technology of China grant 2015CB932303; National Natural Science Foundation of China grants 21420102001, 21131005, 21390390, 21133004, 21373167, 21573178, and 21333008; a NSERC CGS Alexander Graham Bell scholarship (D.M.C.); and a NSERC Discovery grant (P.Z.)

    The Alternative of the Model on the Monetary Policy and the Financial Policy Coordination

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    金融政策与财政政策的密切配合 ,是确保经济健康运行发展的保证。本文就二者的配合问题进行了探讨。The coordination of the monetary policy and the financial policy is the guarantee to ensure the healthful operation and development for our country's economy. This article makes an exploration on the cooperation between the two parts

    企业经济管理中财务管理的重要性分析

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    财务管理作为企业进行管理的重要组成部分,对企业的发展及经营有着至关重要的影响。企业要想在激烈的社会竞争中站稳脚步,获得持续稳定的发展,必须要加强对企业财务管理工作的重视,科学应用企业的资金为企业的生产经营创造良好的条件。论文主要针对企业经济管理中财务管理的重要意义进行探究,希望能够更好地发挥财务管理的作用与价值。</jats:p

    New development of researches on simulation analysis of interaction between waves and breakwater armor units

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    通过流固耦合三维数值模型与先进的GPU计算技术相结合,为模拟分析波浪与防波堤护面块体等水工构筑物的相互作用提供突破性的研究计算手段,能够克服现有连续介质波浪数学模型的不足,解决许多目前需要波浪物理模型才能解决的问题。该模型具有边界改变方便、成本低、分析速度快的特点,能满足多方案设计对科研的要求,因此在工程领域有广泛的应用前景
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