670 research outputs found

    A Preliminary Study On Activating AMPK By MED

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    依赖于5’-AMP激活的蛋白激酶——AMPK在保持细胞微环境的能量稳态上扮演了至关重要的角色,能够被细胞内AMP的增多和ATP的减少所激活,作为代谢感受器调节细胞内ATP相关的代谢途径。AMPK除了调节糖代谢,脂代谢,蛋白质合成等很多能量相关的物质代谢途径外,还在细胞凋亡和血管生成途径中起到重要调节作用。如果能量代谢失衡,则会引起代谢综合症等多种疾病,严重影响现代人的生活,威胁人的健康。作为能量代谢过程中的关键酶,AMPK可以作为代谢综合症的治疗靶点。 AMPK不仅能够被细胞内AMP/ATP的比值上升所激活,也能够被其细胞内的上游激酶所调控,还会响应于缺氧、缺血、氮氧化合物等细胞胁迫作用而激...AMP-activated protein kinase plays an important role in keeping a cellular energy homeostasis, which is activated in response to the increasing of intracellular AMP or the decreasing of intracellular ATP, modulating ATP-related metabolism pathway. Besides glucose metabolisam, lipid metabolism,and synthesis of protein, AMPK is also very important in cell apoptosis and vein generation. Metabolic Syn...学位:理学硕士院系专业:生命科学学院_微生物学学号:2162007115201

    Quality Improvement Based on ISO9001:2015 Quality Management System – A Case Study on Machinery Manufacturing Company K

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    近年来机械加工制造业处于下行阶段,持续低迷的市场形势以及不断攀升的运营成本给企业的生产经营带来了很大的压力和挑战。如何在经营中享有利润空间并在残酷的市场竞争中占据一席成为传统制造企业面临的一个难题。在市场竞争的种类、品质、价格、服务和交期这五个要素中,品质占据非常重要的地位,质量管理是一个突破口。企业要在提高生产效率的同时提高产品质量,满足不断变化的客户需求,同时降低成本,则需要对质量管理体系进行持续改进,从系统的角度提升企业的质量管理水平,以满足不断变化的市场和客户需求。 本文以外资企业性质的机械制造企业K公司的质量管理体系现状为研究载体,结合质量管理相关理论和质量管理工具,基于ISO90...In recent years, machinery industry is in a downward phase. Continued downturn of market situation and rising operational costs bring a lot of pressure and challenges to enterprises’ operations. How to enjoy profit margins in the business and take a place in the fierce competition is facing by the traditional manufacturing industry. In the five competition elements variety, quality, price, service...学位:管理学硕士院系专业:管理学院_工商管理硕士(工商管理硕士)学号:1792013115098

    川桑葚中鞣酸的提取及纯化工艺研究

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    对脱除多糖的桑葚干燥粉末先用N,N—二甲基甲酰胺提取鞣酸,再用石油醚和正丁酸甲酯萃取3次后获得鞣酸粗品。鞣酸粗品经酸沉、醇沉和重结晶3种方法纯化,采用单因素试验与正交试验优选鞣酸提取工艺和纯化工艺。结果发现:最佳提取工艺条件为N,N-二甲基甲酰胺与川桑葚质量比12∶1、石油醚与正丁酸甲酯体积比3∶1、提取温度40℃、提取时间8 h;最佳纯化工艺条件为酸沉时间16 h、醇沉时间4 h、重结晶温度50℃

    Regulation of neuroblastoma differentiation by forkhead transcription factors FOXO1/3/4 through the receptor tyrosine kinase PDGFRA

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    神经母细胞瘤(Neuroblastoma,NB)是起源于交感肾上腺链的恶性实体瘤,在神经母细胞瘤的发病过程中一个关键的早期事件就是成神经细胞分化停滞在不同阶段。TPA和PDGF-BB可诱导神经母细胞瘤细胞发生终末分化,然而参与调控这一分化过程的信号通路和具体分子机制目前并不十分清楚。本研究论文发现敲低细胞内FOXO的表达能够削弱TPA和PDGF-BB诱导的神经母细胞瘤细胞的分化;活化的FOXO能够在生理条件和应激刺激条件(如血清饥饿)下,通过与PDGFRA基因的启动子结合转录调控PDGFRA的表达;PDGFRA表达缺失能够显著抑制TPA和PDGF-BB所诱导的神经母细胞瘤细胞的神经突触的形成;...Neuroblastoma is a common childhood malignant tumor originated from the neural crest-derived sympathetic nervous system.A crucial early event in neuroblastoma pathogenesis is arrested differentiation of neuroblasts at various stages. Treatment of neuroblastoma with TPA and PDGF-BB leads to terminal differentiation of neuroblastoma cells. However, the signaling pathways that are involved in this pr...学位:理学博士院系专业:生命科学学院_细胞生物学学号:2162010015392

    Hepatitis B virus X protein and endoplasmic reticulum stress

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    乙型肝炎病毒(hepatitis B virus,HBV)感染与持续性肝损伤和原发性肝细胞癌(hepatocellular carcinoma,HCC)关系密切.我国是HBV感染的高流行区,给人群带来的健康威胁和损害是关注的热点问题.HBV感染是HCC的主要病原学因素之一,但其诱导肿瘤形成潜在的分子机制依然存在争议.其中HBV的X蛋白(HBV X protein,HBx)在HBV致肝细胞损伤、诱导肝细胞恶性转化、与环境因素暴露协同诱导肝致癌作用等过程中所起的作用都是研究的焦点.HBx作为多功能调控蛋白调控大量细胞信号转导通路,包括内质网(endoplasmic reticulum,ER)应激反应,值得关注的是近几年已有文献报道HBx表达对肝细胞ER应激的诱导作用,但对调控的分子机制的认识还不明确.因此,本文综述了HBx影响肝细胞ER应激的研究进展,为HBV感染诱导肝损伤和疾病的分子机制提供线索.Persistent hepatitis B virus(HBV) infection is closely related to chronic hepatitis,cirrhosis and liver cancer.China is a country with a high prevalence of HBV infection,where the infection rate is up to 60%-70%,bringing great threat and harm to public health.What's worse is that HBV infection is the main etiology factor of primary hepatocellular carcinoma(HCC).However,the underlying mechanisms of virus-induced tumor formation remain controversial.Numerous studies indicate that HBV X protein(HBx) plays a prominent role in HBV-induced liver cell damage,hepatitis,liver fibrosis and malignant transformation,and is related to liver cancer induced by environmental exposure factors.As a multifunctional regulatory protein,HBx regulates a variety of cell signal transduction pathways,including the endoplasmic reticulum(ER) stress response.ER stress refers to the dysfunction of the ER,and misfolded or unfolded proteins gather in the ER.It is noteworthy that the expression of HBx can induce or effect ER stress,although the molecular mechanism remains unclear.This review summarizes the role of HBx in ER stress pathways,providing clues for the liver injury induced by HBV infection.国家自然科学基金资助项目,Nos.81172705,81472997,81573181 973;; 计划前期研究专项基金资助项目,No.2014CB560710;; 福建省自然科学基金资助项目,Nos.2014J01372,2015J01344~

    Study on China's Real Estate Bubble

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    随着我国经济的发展,城市化进程的加快,房地产业得到空前发展。房价越来越高,投机交易极为活跃,百姓越来越买不起房,由此展开了对中国房地产是否存在泡沫的热烈争论。 本文先对房地产价格与宏观经济的作用机制进行探讨,用全国31个省市的面板数据回归出影响房价的各变量系数,为后文研究泡沫大小选取变量做好铺垫。泡沫分析主要有指标分析和基础价值测度两种方法,这都将运用在本文的泡沫分析中。在指标分析中,采用经济指标和价格指标两大类对中国房地产是否存在泡沫进行衡量,得出很多指标都超过正常水平,尤其是房价收入比,东部省市形势更为严峻。在基础价值测度中,关键测算泡沫大小,将房地产基础价值看作一种状态变量,建立基于房...With the development of economy, the acceleration of urbanization, the real estate industry gets unprecedented development. Higher and higher housing price, hyperactive speculative trading and people’s inability to house lead to warm debate on China’s real estate bubble. First the thesis makes research on the interaction mechanism between real estate price and macroeconomic. Through a panel da...学位:经济学硕士院系专业:经济学院经济研究所_政治经济学学号:2902008115222

    对完善我国税制结构的思考

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    税制结构是指税种构成的布局,它是税制中一个非常重要的战略问题。而税制结构的核心是主体税种的选择及其格局,它合理与否会从总体上影响税制结构,进而影响到税收职能作用可否有效的发挥。改革开放以来的多次税制改革,使我国已初步建立起了以流转税和所得税为双主体的..

    Design, synthesis of diaryl ether tyrosine kinases inhibitior and study of their antiaumor activities

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    肿瘤是机体在各种致癌因子作用下,细胞内遗传物质发生改变,进而导致基 因表达失常,细胞异常增殖的新生物。以一些与肿瘤细胞分化增殖相关的细胞信 号转导通路的关键酶作为药物筛选靶点,发现选择性作用于特定靶点的高效、低 毒、特异性强的新型抗癌药物——酪氨酸激酶抑制剂已成为当今抗肿瘤药物研究 开发的重要方向。 本文结合计算机辅助设计和文献分析,以二芳醚为基础利用生物电子等排体 理论用酰胺结构代替脲,设计合成了五个系列的二芳醚酰胺类化合物,并对这些 化合物进行抗肿瘤活性筛选。本文分别选取HepG2、A549及HT-29作为研究对 象。 实验结果表明:(1)在所设计的四类化合物中,N-(单...Tumor is an abnormal proliferation of tissue as a result of abnormal growth or division of cells, which can be caused by genetic mutations. Some of the key enzymes in tumor cell differentiation and cell proliferation-related signal transduction pathway as a target for drug screening and found that selectively act on specific targets efficiency, low toxicity and ...学位:理学硕士院系专业:药学院_药物化学学号:3232011115329

    An Analysis of the Column “News 1+1”

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    经济的发展、社会的进步尤其是新闻政策的逐渐宽松,为我国电视新闻评论的发展创造了条件,中国大陆地区的电视新闻评论节目正在突破相互效仿、形式雷同的窠臼,探索独具特色的节目模式。2008年3月24日中央电视台新闻频道推出一档全新的时事新闻评论节目——《新闻1+1》,节目以全新的形式、充实的内容开创了中国电视新闻评论的新时代。 本文以《新闻1+1》栏目为研究对象,通过对我国电视新闻评论发展历程与新闻政策演变历程的纵向梳理,和对国内电视新闻评论节目具体案例的横向比较,综合运用新闻学、传播学和叙事学等学科理论,在总结和吸收学术界前辈研究的基础上,具体分析《新闻1+1》栏目的创办背景、选题特点、节目特色、...Due to the economic development, social progress and the progressive news policies, China's television news commentary programs have made great achievement. They broke off similarity to explore different mode. On March 24th, 2008, a totally new program, “News 1+1”, was released on CCTV, which has inaugurated a new era of TV commentary history with its unique form and enrich contents. This essay ...学位:文学硕士院系专业:新闻传播学院新闻学系_新闻学学号:3062007115244

    Periostin promotes liver fibrosis progression via TGF-β signaling

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    肝纤维化是指肝细胞发生坏死及炎症刺激时,细胞外基质蛋白的合成、沉积与降解和吸收失去平衡,进而导致肝脏内纤维结缔组织过度沉积并影响肝功能的病理过程。肝纤维化的病理机制并不完全清楚,但HSC和巨噬细胞激活产生大量的细胞因子是该过程的主要特征。Periostin作为一种细胞外基质蛋白,能与多种细胞外基质成分相互作用并参与胚胎组织发育和肿瘤的侵袭转移,但其在肝纤维化中的功能尚不清楚。本研究主要探讨了Periostin在肝纤维化中的功能。我们发现Periostin在肝炎病人血清和CCl4诱导的小鼠肝脏中高表达,敲除Periostin会使CCl4诱导的小鼠肝纤维化程度下降,炎症细胞的侵润减少。HSC经炎症...Liver fibrosis is a disease characterized by massive depositon of extracellular matrix with severe destruction of the liver function.The pathogenesis of liver fibrosis is not fully understood,but activation of HSC and macrophages with excessive production of cytokines are important hallmarks of the condition.As a extracellular matrix protein,periostin is participate in embryonic development,cell a...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:2162010115240
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