115 research outputs found

    Investigate brain network topological property changes in the early stage of mild traumatic brain injury, a study based on MRI

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    目的:基于弥散张量成像技术(diffusiontensorimaging,DTI)和血氧水平依赖磁共振成像技术(bloodoxygenleveldependentmagneticresonanceimaging,BOLD-fMRI)探讨轻型脑创伤患者急性期(mildtraumaticbraininjury,mTBI)脑结构网络和功能网络拓扑结构属性的变化特征。 材料和方法:前瞻性病例对照研究,通过厦门大学医学院伦理委员会批准,2014年11月开始,2015年8月结束,在厦门大学附属东南医院完成。研究对象纳入标准:临床诊断mTBI(GCS评分13~15分);右利手;能够配合检查。排除标准:合并...Objective: To explore the changes of topological properties of the brain networks based on DTI and BOLD data from patients with mild traumatic brain injury (mTBI) in early stage. Materials and methods: A prospective case-control study admitted by the medicine ethics committee of medical college of Xiamen university. It began in November 2014 in the southeast hospital affiliated of Xiamen universi...学位:医学硕士院系专业:医学院_影像医学与核医学学号:2452014115351

    Study on Fermentation Strategies of Arachidonic Acid by Mortierella alpina

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    花生四烯酸(Arachidonicacid,ARA)属于ω-6系列多不饱和脂肪酸,因具有促进婴幼儿脑部发育、提高机体免疫力等多种重要的生理功能而被广泛应用于医药、食品等各种领域。传统的ARA主要来源于动物油等,难以满足市场需求,而利用微生物产ARA具有不受产地、原料、条件等限制的优点,成为当前研究的热点之一。 本文首先对目前用来生产ARA最常用的微生物高山被孢霉(Mortierellaalpina,M.alpina)的培养条件进行了研究,通过摇瓶实验考察了碳源、碳氮比、初始pH值、接种量和微量元素等对ARA的影响。结果发现在培养基中使用葡萄糖为碳源,碳氮比维持在40:1至50:1之间,初始p...Arachidonic acid (ARA) is one of omega-6 polyunsaturated fatty acids (PUFAS), which has been widely applied in medicine, food industry and other fields because of its various physiological functions such as promoting the brain development of infants and increasing immunity of human body. Traditional ARA mainly comes from animal oils, which is difficult to meet the demand of market Therefore, the p...学位:工学硕士院系专业:化学化工学院化学工程与生物工程系_化学工程学号:2062009115127

    The Research of Occupation Burnout in Grass-Roots NGO:A Case Study Of X Organization in Amoy

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    本研究以厦门市X机构为例,运用文献法对职业倦怠的相关概念进行梳理,对职业倦怠的概念进行清晰化;结合参与观察法和深度访谈法,了解X机构员工职业倦怠的现状,分析员工产生职业倦怠的根源,员工应对职业倦怠的途径和应对结果等,并由此反观我国草根NGO的生存状态,并对职业倦怠的预防提出可行性建议。本文认为X机构员工的职业倦怠问题主要来自于个人层面、机构层面和政府层面,首先政府的严格控制导致X机构的发展步步维艰,其次X机构的内部管理制度不完善导致员工的工作效率低和工作成效慢,最后由于个人调解情绪的方式和工作方式等问题,导致负面情绪积压,最终导致职业倦怠的发生。 本文分为四个章节: 第一章是导论,主要介绍...Base on the case of X organization in Amoy, the article use the method of literature to clear the concept of job burnout. Combining the observation method and interview method, the article aims at understanding the job burnout situation, analyzing the root causes of burnout, the ways to deal with burnout and results. With this analyzing, we can see the survival status of grass-roots NGO in China. ...学位:法学硕士院系专业:公共事务学院社会学系_社会学学号:1402010115052

    Comparative study on elderly mirror-image dextrocardia patients and the normal elderly

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    目的研究对比静息状态下镜像右位心老年人与正常老年人的心功能指标的差异,为相应老年人镜像右位心患者心功能退化和心衰的发生发展提供参考。方法回顾性分析厦门大学附属东南医院2006年2月至2016年7月经超声心动图及胸片诊断为镜像右位心且不合并其他异常畸形的老年患者12例(其中男7例,女5例)临床资料,与12例老年正常心志愿者对比分析左心室射血分数(EF)、左心室缩短分数(FS)、心率(HR)、每搏输出量(SV)、每分输出量(CO)等心功能指标,比较两者间是否存在明显差异。结果镜像右位心老年患者的心率、左室射血分数、左心室缩短分数、每搏输出量、每分输出量分别为(83±12.79)次/min、(0.61±0.58)、(0.32±0.40)、(57.82±11.90)mL和(4.84±1.42)L/min,正常老年人分别为(71.71±11.92)次/min、(0.61±0.57)、(0.32±0.46)、(58.71±11.78)mL和(4.22±1.22)L/min。2组人群比较,心率差异有统计学意义(P0.05)。结论镜像右位心老年患者的心率比正常老年人心率快,而其他心功能指标则无明显区别。ObjectiveBy comparing the differences of heart function between the mirror-image dextrocardia elderly and the normal elderly in the resting state,to provide a reference for the development of heart failure and heart failure in the elderly mirror-image dextrocardia patients MethodsWe collect separately12diagnosed with mirror-image dextrocardia elderly(including7males and5females)by echocardiography and chest radiographs and12normal elderly in the southeast hospital of Xiamen University from February2006to July2016,compared and analyzed cardiac function indicators as follows:Left ventricular ejection fraction(EF),left ventricular shortening score(FS),heart rate(HR),stroke volume(SV),and output per minute(CO),and to determine whether there is a difference between the two elderly.ResultsThe right heart rate,left ventricular ejection fraction,left ventricular shortening score,stroke volume,and per minute output of the mirror-image dextrocardia elderly are(83±12.79)t/min,(0.61±0.58),(0.32±0.40),(57.82±11.90)mL,and(4.84±1.42)L/min,respectively.And the normal elderly are(71.71±11.92)t/min,(0.61±0.57),(0.32±0.46),(58.71±11.78)mL,and(4.22±1.22)L/min,respectively.There are significant differences in heart function between the two groups(P<0.05),but there are no significant difference between the left ventricular ejection fraction,the left ventricular shortening score and the stroke volume per stroke(P>0.05).ConclusionThe heart rate of the elderly patients with mirror-image dextrocardia is faster than the normal elderly,and the cardiac function index of the left ventricular ejection fraction,left ventricular shortening score,stroke volume are no obvious difference.国家自然科学基金(81671667);中国博士后科学基金(2015M570436

    Domestication of the high-sugar-tolerant Mortierella alpina on arachidonic acid(ARA) production

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    通讯作者:Tel: 86-592-2186038; : [email protected][中文摘要]【目的】提高花生四烯酸(Arachidonic acid,ARA)产量,克服ARA产生菌高山被孢霉(Mortierella alpina)在长期的保存及使用过程中易受到外界条件影响发生退化,从而导致菌种耗糖量降低、影响菌种摄入营养的能力和不利于工业化生产的缺点。【方法】首先采用固体培养基驯化,将菌种逐级涂布于梯度高糖PDA平板(含糖量分别为2%、5%、7%、10%和15%)培养,挑选经固体驯化后能耐受10%高糖浓度平板的菌种,转接到两种含不同氮源的梯度高糖(含糖量分别为3%、4%、5%和6%)液体培养基中进行驯化,最后对驯化后的菌种进行2 L发酵罐放大实验。【结果】当培养基中以酵母粉为氮源时,驯化后菌体的最高耗糖量由3 g/(L.d)提高到12 g/(L.d);当培养基中以玉米浆为氮源时,驯化后菌体的最高耗糖量由7 g/(L.d)提高到12 g/(L.d)。摇瓶驯化实验结果表明以玉米浆为氮源驯化的菌种发酵效果较好,发酵罐实验结果显示菌体生物量为50 g/L,总油脂为18 g/L,目的产物ARA产量为8 g/L。相比未驯化之前的发酵结果,生物量和总油脂含量提高了近3倍,ARA产量提高了近4倍。【结论】经过高糖驯化, 菌种的耗糖能力得到提高, 生物量、总油脂及ARA 的产量也都有所增加, 从而可以使菌种在保存和使用过程中不易退化,保持稳定。[英文摘要][Objective] In order to improve arachidonia acid(ARA) production,and prevent the degeneration of ARA-producing strain Mortierella alpina in long-term culture preservation and cultivation,which could lead to low consumption rate of substrates like carbon source.[Methods] Mortierella alpina strain was first domesticated in high-sugar PDA plate with gra-dient sugar content(2%、5%、7%、10% and 15%).The strain which grew better in the solid medium containing 10% sugar was then selected and transferred to two liquid high-sugar media with different nitrogen sources to domesticate. The gradient sugar contents were 3%、4%、5% and 6%, respectivlely. Finally, the domesticated strain was used to produce ARA in a 2 L bioreactor. [Results] The experimental results show that the consumption of sugar increased from 3 g/(L·d) up to 12 g/(L·d) in the medium with yeast extract, and from 7 g/(L·d) up to 12 g/(L·d) in the medium with corn steep liquor. After cultivation for 144 h in a 2 L bioreactor,the yield of ARA reached 8 g/L, which was 4 times higher than that obtained with the original strain. [Conclusion] The domestication of the high-sugar-tolerant Mortierella alpina increased the consumption of sugar, biomass, total fatty acid and ARA production. The domesticated strain could maintain the high sugar resistance in the preserving process and turn to be more stable.福建省科技厅重大专项项目(No.2010NZ0001-4);; 国家自然科学基金项目(No.31071488

    Studies on structures and properties of glycerol and 3-hydroxypropionaldehyde by density function theory method

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    采用密度泛函理论(dfT)广义梯度近似(ggA)-VWnbP水平和dnd基组研究了甘油和3-羟基丙醛的全优化几何构型、电子结构、福井前线轨道和热力学性质,为研究该类化合物的结构与性质关系提供理论依据,为甘油脱水酶结构改造和分子设计提供配体数据.In this paper,the glycerol and 3-hydroxypropionaldehyde structures is modeled by using density function theory(DFT) method at the level of(GGA)-VWNBP and the DND basis set.Then their geometrical structures,electronic structures,Fukui frontier orbital and thermodynamics properties have been computed providing theoretical basis for the study of the structure and activity relationship of these compounds.国家自然科学基金资助项目(21076172);福建省高校产学合作科技重大项目(2010H6023);福建省大学生创新基金资助项目(2008cxsy01);泉州市技术研究与开发基金资助项目(2010G6

    化学气相沉积SiC–B_xC涂层在高温模拟环境中的微观结构

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    将化学气相沉积在石墨基片上的SiC-BxC复合涂层在O2(8kPa)/H2O(14kPa)/Ar(78kPa)的模拟气氛中,分别加热到700,1000℃和1200℃处理10h。利用扫描电镜、X射线衍射、能谱分析、显微Raman和Fourier变换红外光谱仪研究其微观结构。结果表明:复合涂层中的BxC层在700~1000℃的模拟环境中会被完全氧化成B2O3和H3BO3;在1000~1200℃的模拟环境中,BxC层的氧化产物迅速挥发。经高温模拟环境处理后,复合涂层中生成了硼硅酸盐玻璃,且各氧化产物和SiC层的结晶度随处理温度的升高而下降。基于微观分析结果,对SiC-BxC复合涂层的自愈合抗氧化性能进行了分析

    便携式肘关节康复训练机器人

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    目的:为了达到上肢运动功能障碍患者对于康复的实际需求,就需要设计对应的便携式肘关节康复训练机器人。方法:进行了机械结构、电路和软件方面的设计,在软硬件综合调试的基础上,通过实验测试分析可行性。结果:通过实验,针对肘关节的隧洞性能进行测试,这样就可以对系统康复训练功能可行性进行验证。结论:该机器人与康复训练模式进行相互的结合,这样就可以实现患者神经功能的重塑要求,同时也为其广泛应用提供指导和参考。国家自然科学基金项目(61571381);;福建省软科学计划项目(2016R0083

    一种富集高温栅藻Desmodesmus sp. F51的新型生物絮凝剂

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    【背景】海科贝特氏菌(Cobetia marina)可产生大量具有絮凝活性的胞外产物,可视为一种新型的生物絮凝剂。高温栅藻(Desmodesmus sp. F51)是一种具有较高叶黄素含量的微藻,被认为是一种新兴的叶黄素来源,但利用该生物絮凝剂高效富集高温栅藻的相关研究迄今尚未见报道。【目的】以高温栅藻为对象,研究该新型生物絮凝剂的絮凝效率,并对絮凝机理进行初步探讨。【方法】探索在不同生长阶段微藻培养液添加生物絮凝剂、添加量、絮凝时间、pH对絮凝效率的影响,分析生物絮凝剂的功能基团,并测定在不同pH条件下添加生物絮凝剂前后高温栅藻的Zeta电位变化,以及在显微镜下分析藻细胞在添加生物絮凝剂前后的形态。【结果】在高温栅藻生长至稳定期,pH 8.0添加2 mL生物絮凝剂,絮凝15 min絮凝效果最佳,达82.1%。傅里叶红外图谱显示了多糖及酰胺结构的特征吸收峰,由此推测生物絮凝剂主要是多糖的混合物,含有少量蛋白质。根据Bradford法测定絮凝剂中蛋白含量约为0.4%(质量比),通过苯酚-硫酸法测定总糖质量分数约为34.5%(质量比),与FTIR谱分析结果基本相符。生物絮凝剂在pH 4.0~11.0保持60%以上的絮凝效率,说明无论是酸性或是碱性条件下絮凝效率都较高,结合Zeta电位的分析表明,推测生物絮凝剂对高温栅藻的絮凝机理中占主导地位的可能是吸附架桥作用。【结论】该研究对微藻生物絮凝具有重要的理论和实践意义。厦门市科技计划项目(3502Z20173018)福建省自然科学基金(2017J01077)国家自然科学基金项目 (31871779

    人类Foxm1b基因的原核表达、抗体制备及其对肝癌细胞中Foxm1b蛋白的识别

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    【目的】构建人类Foxm1b基因的原核表达载体,表达并纯化蛋白,制备多克隆抗体,并用此抗体检测肝癌细胞中Foxm1b基因的表达,为进一步研究Foxm1b基因的功能奠定基础。【方法】从GenBank中下载人类Foxm1b基因全长cDNA序列并用Pegene软件分析其可能的抗原表位,设计引物.应用RT—PCR获得含抗原表位的Foxm1b基因片段,重组人原核表达载体pET-28a,在大肠杆菌BL-21(DE31中诱导表达,应用亲和层析法获得纯度较高的原核表达蛋白并免疫大鼠制备多克隆抗体,用ELISA检测抗体滴度并用免疫细胞化学的方法检测此抗体对肝癌细胞中天然Foxm1b蛋白的识别。【结果】成功构建了Foxm1b基因重组表达载体pET-28a—Foxm1b,表达的蛋白经纯化后免疫大鼠得到了高滴度的多克隆抗体.该抗体可以识别肝癌细胞中的天然抗原。【结论】人类Foxm1b基因的原核表达载体的构建、重组蛋白的表达纯化及有诊断价值的抗体的制备为后续的研究提供了基础
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