154 research outputs found

    Modification of Energy Metabolism-related Proteins is Responsible for Ceftriaxone-resistance

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    随着抗生素药物的开发与利用,细菌在对抗药物过程中逐渐发展出各种不同的耐药机制.近年来高通量的蛋白质组学技术已逐渐用于细菌耐药性机理研究,但主要集中在对细菌外膜蛋白的作用进行分析.本文采用2-d nATIVE/SdS PAgE方法从蛋白质复合物角度分析接近生理条件的胞浆蛋白在头孢曲松耐药性中的作用.结果发现8个耐药性相关蛋白质,通过对蛋白质功能分析,揭示了细菌通过调整能量代谢相关蛋白产生耐药性的新机制.进一步对相关菌株的次抑菌浓度和生存率分析,提示MAlP和SuCC等关键蛋白质可作为设计和开发新型抗菌分子的作用靶点.Outer membrane proteins of bacteria have been investigated systematically in response to antibiotic resistance by high-throughput proteomic techniques in recent years,but the data of the cytoplasmic proteins analyzed on a proteome scale are not available yet.In this study,2-D native/SDS-PAGE was first applied for characterization in cytoplasmic proteins responding to ceftriaxone-resistance in Escherichia coli.Eight proteins involved in modification of energy production and conversion were identified responsible for ceftriaxone-resistance.Among these proteins,down-regulated MalP and up-regulated SucC were found to play critical roles in response to resistance according to the MIC and survival ability analysis,and the two proteins may be candidate targets for development of novel antimicrobial drugs.浙江省自然科学基金项目(No.Y2090396);浙江理工大学科研启动基金项目(No.11615432610862)---

    Materials Genome Initiative and Nuclear Fuel Element Material

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    核能由于其高能量密度和低污染排放等优点,已经成为未来能源的重要组成部分。然而,民用核燃料材料因其特殊的放射性,实验研究的安全防护成本极高,尤其是; 经过辐照后的核燃料材料,分析和表征手段极其有限,如果采用传统的试错法材料研发方法,将会使材料的研发成本大幅提高,因此,材料基因工程的研究思路正是; 适合于新型民用核燃料材料研究的技术路线。本研究组多年来以开发新型民用核燃料元件材料为目标,通过第一性原理和CALPHAD技术的结合,先后建立了U; 、Pu等锕系元素的多组元热力学数据库,并建立了辐照场作用下的热力学模型,对辐照场作用下核燃料材料的相变热力学和动力学进行了深入研究,在热力学数据; 库的基础上,运用相场动力学模型对核燃料元件材料的凝固和时效过程组织演化规律进行了系统的研究。这种基于材料基因工程的多尺度、多组元的材料设计研发思; 路为我国新一代具有自主知识产权的民用核燃料元件材料的成分设计、组织控制、工艺优化、性能改善及服役时间预测提供了重要的理论基础,同时对材料基因工程; 方法在材料开发中的广泛应用具有重要意义。Nuclear energy is an important part of the future source of energy due; to their higher energy density and lower emission of pollutants.; However, the traditional research method of "trial-and-error" may result; in higher costs and lower efficiency because of the radioactivity of the; nuclear fuel element material. The idea of Materials Genome; Initiative(MGI) is suitable for the research and development of the; nuclear fuel element material. Focused on the nuclear fuel element; material,our research group developed a multi-component thermodynamic; database including U,Pu and other elements,by coupling CALPHAD method; and the first-principle method. Based on the thermodynamic database, the; thermodynamic model under irradiation was established and the phase; transformations under irradiation were systematically investigated. The; microstructure evolutions during solidification and aging were simulated; by using the Phase-Field method. The present multiscale and; multi-component materials design method based on MGI can provide; important information for the design of composition,microstructure; controlling and property improvement of nuclear fuels materials.中央高校基本科研业务费; 国家自然科学基金资助项

    Level walking stride frequency forecast based on Kalman filter model

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    现有智能下肢的控制策略都是以刚完成的一步的步频为调节阻尼的依据,调整好的阻尼只能在下一步摆动期生效,因此该控制策略是滞后的,无法做到实时控制,在步频变化频繁的场合难以适用。本文方法利用足底压力传感获取步频数据,然后通过卡尔曼预测方程由已完成的步频预测即将迈出的下一步步频。在模拟日常生活平地行走步频变化的实验中,所预测的下一步步频与后验值之间偏差比跟随方法的偏差大约减小了10%。该方法实时性好,为改善智能下肢的性能提供了新的可行性方案。The adjusted damping of intelligent lower limb can only take effect in the next swing cycle because the control is based on the stride frequency of the prior stride.Therefore,this control tactics is ineffective,it is unable to achieve the real-time control and is difficult to be applied when the stride frequency changes frequently.A stride frequency prediction method based on the plantar pressure sensing and Kalman prediction model was proposed in this paper to solve the problem.The plantar pressure sensing obtains data of stride frequency,then the Kalman prediction model predicts the next stride frequency based on the stride frequency that has been known.In the level walking experiment,the deviation between the next step stride frequency predicted by this method and the posterior values reduced about 10% compared with the deviation of the following method.It has good real-time performance and provides a feasible plan for the performance improvement of the intelligent lower limb.国家自然科学基金资助项目(61172046); 福建省自然科学基金资助项目(2012J01413); 中央高校基本科研业务费专项资金资助项目(XMU.2013121018

    Gold Nanoparticles Application in Gene Mutation Detection and SNP Analysis

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    [中文文摘]对特异核苷酸序列的高选择性检测在生物医学研究和临床检测中日趋重要.纳米金特殊的光学性质、电学性质、化学性质、以及良好的生物相容性,使之成为检测生物大分子的首选工具.本文介绍了几种典型的基因突变检测及单核苷酸多态性(SNP)分析系统:基因芯片、生物传感器和光学检测系统.综述了多种颇有新意的检测方法和原理,详细阐明了它们的检测机制和研究进展,分析并比较了纳米金不同的作用方式,为纳米金在突变检测上的进一步研究提供了一定思路和参考.[英文文摘]Highly selective detection of specific oligonucleotide sequences is increasingly important in biomedical research and clinical diagnosis.The excellent optical,electrical,and chemical properties make gold nanoparticles(GNPs) unique tools for biomolecule detection.GNPs-based methods for the detection of gene mutation and single nucleotide polymorphism(SNP) are more selective,sensitive,and cost-efficient,compared to the conventional technologies,which require bulky and expensive instruments or involve time-cost procedures. This paper presents and demonstrates the principles and mechanisms of several typical GNPs-based methods for gene mutation and SNP analysis , aiming to provide some ideas and references for further studies.福建省青年科技人才创新项目(No.2006F3128)资助

    The Circuit Design of Piezoelectric Jetting Dispensing Control System

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    基于新型压电式点胶头采用的双压电陶瓷的推挽驱动作为胶体喷射的作用机制,设计并搭建了压电式喷射点胶控制系统,完成了硬件与软件模块的组装调试,实现对下压电陶瓷信号的频率、占空比、幅值、上压电陶瓷信号幅值的连续可调,具备人机交互、清洗、喷射点数可调等功能。经测试,系统各参数达到预定指标,频率显示误差:±1.2 Hz;占空比显示误差:±1%;幅值显示误差:±8 MV。在驱动方波电压200 V、频率65 Hz、占空比20%、喷嘴直径250μM、供料压力4 bAr、喷射高度3.5 MM的条件下,得到平均直径为1.07 MM左右的喷射胶滴,一致性误差为±2%。According to the working principle of newly piezoelectric dispensing head,which using the pushed driving of double piezoelectric ceramic for colloform jetting,we design and establish this piezoelectric jetting dispensing control system.Meanwhile,package the hardware and debug the software,achieve the goal that frequency,duty cycle and amplitude of the lower piezoelectric ceramic signal,amplitude of the upper piezoelectric ceramic signal can be continuously adjusted.The system has the function of man-machine interaction,cleaning,regulating injection points,and so on.After tested,all of the system parameters can meet the presupposed index,with the frequency display error: ±1.2 Hz,duty cycle display error: ±1%,amplitude display error: ±8 mV.Under the condition that voltage of the driving squarewave 200 V,frequency 65 Hz,duty cycle 20%,diameter of nozzle 250 μm,pressure 4 bar,height of jetting 3.5 mm,we get the jetting drops with an average diameter of 1.07 mm,and its conformity error ±2%.中央高校基金科研业务费专项资金资助项目(2010121039

    并联锂离子电池组建模及不均衡电流分析

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    近年来电池储能以其响应速度快、能量密度高等优点,在电力系统中发挥重要作用。为满足实际应用的要求,电池储能系统需要将电池或电池组并联从而达到较高的可用容量,但并联电池在实际中受内阻、容量、荷电状态 (SOC)等影响将出现电流不平衡现象,一定程度上制约了电池充放电电流和使用条件,影响了电池性能。针对并联电池组支路电流采集过程繁琐且状态估计复杂的情况,以电池的二阶等效电路为基础,结合回路电流法建立了并联电池组的仿真模型。模型能够根据锂电池的性能参数及状态方程实现并联支路电流的计算,进而估计并联电池组的状态,省去了对并联支路电流的检测环节。同时重点研究了并联电池组的支路不均衡电流现象,以磷酸铁锂电池为例,分析了并联电池组的充电特性。针对并联电池组的支路不均衡电流影响因素较为复杂、难以解耦的特性,采用控制变量法,通过模型详细分析了内阻、容量、初始SOC等因素对支路电流点的影响,为并联电池组的设计、成组优化及性能分析提供了参考

    Analysis on epidemiological charateristics of chlamydia trachomatis infection in Jiangsu Province,2006-2011

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    目的了解江苏省2006-2011年生殖道沙眼衣原体感染的流行病学特征,为制定防治生殖道沙眼衣原体感染的策略提供科学依据。方法收集2006-2011年江苏省通过中国疾病预防控制信息系统报告的生殖道沙眼衣原体感染病例资料,并对资料进行流行病学分析。结果 2006-2011年,江苏省生殖道沙眼衣原体感染发病率呈快速上升的趋势,2006年为0.12/10万,2011年为3.15/10万,发病率年均增长速度为92.23%;在报告的5 859例病例中,男女性别比为0.3∶1,各年生殖道沙眼衣原体感染男女性别差异有统计学意义;发病年龄主要集中在20~29岁年龄组,占50.96%;江苏省生殖道沙眼衣原体感染报告病例主要集中在苏南和苏中的较发达城市;主要以家庭及待业者和工人为主。结论江苏省生殖道沙眼衣原体感染发病率快速增长,应加强对生殖道沙眼衣原体的防治,以控制其感染的快速流行。江苏省医学重点人才(RC2011086);江苏省医学重点人才(RC2011087); 江苏省科技项目(Y201029

    “推进一流本科教育,提高人才培养质量”的理念、路径与方法(笔谈)

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    建设世界一流大学需要高度重视本科教育。\"推进一流本科教育,提高人才培养质量\"的前提是要理解本科教育的本意,从不同维度反思\"我们需要什么样的本科教育\"\"什么是好的本科教育\"\"如何推进一流本科教育\"等问题。从宏观层面看,本科教育的使命是为了促进每一个大学生\"成才\"和\"成人\"。从现实需求看,一流本科教育不可忽视跨学科人才培养,需要按照学科标准、职业标准和学生标准对专业进行重新分类,为跨学科专业设置、新工科建设以及高校专业设置与调整开辟理论空间。目前,我国本科教育的最大问题是培养目标不明确,面临学术型与应用型的抉择。好的本科教育需要基于本科生\"关键能力\"的培养,彻底消除他们对于专业的陌生感,满足他们对于理智的好奇心,撤除横亘在大学与社会之间的藩篱并激发他们的创新创业精神。具体来说,一流本科教育是一流\"教\"与\"学\"的统一,需要一流的投入和一流的教育管理,需要在教学改革中侧重技术层面的突破。一流本科教育不是一流大学的\"专利\",不是\"一类本科\",没有固定模式,更不能盲目追求学术GDP。对于应用型本科高校而言,在\"一流本科教育\"中要结合学校特点和办学实际,做出异于\"双一流\"建设高校的现实抉择。作为一类特殊性质的高校,中外合作大学在建设一流本科教育的过程中,要在引入国外优质高等教育资源的基础上,强调对相关资源的消化、吸收、融合、创新,从而培养出符合社会主义现代化建设要求的高素质国际化人才。国家社会科学基金教育学一般项目“新时代中国特色高等教育话语体系构建研究”(BIA180200);;教育部国别和区域研究专项资金资助课题“高等学校专业设置规划与质量保障体系研究

    毕赤酵母分泌表达嵌合HEV表位的HBcAg颗粒

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    在毕赤酵母分泌表达嵌合有HEV受体相关表位12A10的HBcAg蛋白,经甲醇诱导后的培养液上清通过切向流浓缩、更换缓冲液后,进行疏水层析纯化.CsCl等密度梯度离心测得分泌的重组颗粒的密度为1.32 g/mL.透射电镜观察显示,纯化的重组颗粒为均一的直径30 nm左右的空心颗粒.小鼠免疫实验表明,纯化颗粒免疫8周后鼠血清中的特异性12A10抗体滴度可达到1.6×105,并且重组颗粒较好地呈递了HEV受体相关的非免疫优势表位.本文的结果为毕赤酵母胞外分泌表达其它大尺度的重组蛋白颗粒提供了参考,为研究携带表位多肽的疫苗载体提供了范例
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