四种不同样品处理方法对人胎盘组织总RNA提取的影响

目的:比较四种不同样品处理方法对人胎盘组织总RNA提取的影响,为RNA提取时的组织处理方法提供实验依据。方法:将新鲜人胎盘组织按0.1g的重量分成相等的80份,按照随机原则分成4组,每组分别采取不同的处理方法后置于液氮罐中保存并于日后用Trizol法进行总RNA提取,通过琼脂糖凝胶电泳和紫外分光光度计对RNA的浓度和纯度进行检测,所得数据进行统计学处理。结果:(1)提取成功率P0.05,差异无显著性意义;(2)琼脂糖凝胶电泳总RNA样品较为完整,基本无降解;(3)纯度(OD260/OD280值代表)P0.05,差异无显著性意义;(4)浓度P0.05,差异无显著性意义。结论:尚无足够的证据证明,不同的处理方法对用Trizol法从人胎盘组织中提取总RNA有影响,在实际工作中我们可以采取较为简便、节约的方法。     

香花槐各组织总RNA提取方法的改良和优化

为探索香花槐各组织总RNA提取的最佳方法,以实验苗圃中的香花槐为实验材料,在比较了Trizol试剂法和常规CTAB法的基础上,建立了香花槐不同组织的最适提取方法.改良CTAB法利用高质量浓度的β-巯基乙醇和合适质量浓度的聚乙烯基吡咯烷酮(PVP)来防止RNA提取过程中多酚的氧化,然后增加苯酚/氯仿抽提次数来去除香花槐叶片和茎皮过多蛋白质.改良Trizol试剂法在根皮中加PVP研磨成白色粉末,可以有效地防止反应液褐化.各组织优化方法经琼脂糖凝胶电泳检测,所提取的总RNA的28S、18S条带清晰明亮,无降解;其A260nm/A280nm值为2.0,表明提取的总RNA质量较好.     

蓝舌病病毒内蒙古分离株VP2基因5''端序列分析及探针制备

从内蒙古巴盟地区分离的蓝舌病病毒株(BTV-NM)提取总RNA,经反转录PCR扩增VP2基因5′端片段,并构建至pGEM-T载体中.序列测定后,将这一序列与蓝舌病毒澳大利亚株VP2基因5′端进行比较分析:同源性为40%.通过PCR法标记克隆的cDNA片段,制备地高辛标记探针,与粗提的蓝舌病发病羊病毒RNA进行Northern blot杂交,并作敏感性试验,结果表明此探针对蓝舌病毒内蒙古分离株具有特异性,可检测出50 pg的病毒RNA.     

蓝舌病病毒内蒙古分离株VP_2基因5′端序列分析及探针制备

从内蒙古巴盟地区分离的蓝舌病病毒株(BTV-NM)提取总RNA,经反转录PCR扩增VP2基因5′端片段,并构建至pGEM-T载体中.序列测定后,将这一序列与蓝舌病毒澳大利亚株VP2基因5′端进行比较分析:同源性为40%.通过PCR法标记克隆的cDNA片段,制备地高辛标记探针,与粗提的蓝舌病发病羊病毒RNA进行Northernblot杂交,并作敏感性试验,结果表明此探针对蓝舌病毒内蒙古分离株具有特异性,可检测出50pg的病毒RNA.     

从福尔马林固定的癌组织中提取RNA的方法

目的:寻求从福尔马林固定的癌组织中提取RNA的合理方法.方法:运用Trizol法从福尔马林固定的胃癌组织中提取RNA,用分光光度计测定RNA的产量和纯度;通过RT-PCR对不同长度的管家基因-actin进行扩增.结果:100 bp和300 bp的-actin均能顺利扩增出特异性条带,500 bp的-actin未能扩增.结论:用Trizol法从福尔马林固定的癌组织中提取RNA是可行的;进行RT-PCR时应尽量设计小片段引物(100~300 bp)以获得更好的扩增效果.     

实验室病毒检测能力验证与粪便样本中小鼠诺如病毒的检测

目的 通过对国际实验动物科学理事会(the International Council for Laboratory Animal Science, ICLAS)能力验证计划(Performance Evaluation Program, PEP)提供的4份病毒盲样进行检测,从而对实验室病毒检测能力进行验证,进一步提高实验室的病毒检测水平。方法 对ICLAS提供的盲样信息进行分析,提取核酸进行PCR检测并对阳性产物进行测序验证。对诺如病毒阴性盲肠内容物进行不同倍数的稀释后,与诺如病毒培养液1∶1混合,使用两种不同的核酸提取试剂盒进行核酸提取,通过荧光定量PCR方法进行诺如病毒核酸检测,比较检测的核酸拷贝数。结果 经过检测确定ICLAS提供的盲样分别为小鼠脑脊髓炎病毒、小鼠诺如病毒、小鼠轮状病毒以及小鼠乳酸脱氢酶增高症病毒。比较不同稀释度的盲肠内容物诺如病毒荧光定量PCR检测结果发现,使用病毒DNA/RNA提取试剂盒提取核酸,稀释度不高于1∶16时,检测结果相比于病毒对照出现不同程度的偏差,稀释度为1∶32时检测结果与病毒对照检测结果相近。使用病毒RNA提取试剂盒提取核酸,稀释度不低于1...     

湘文一号抗虫棉幼叶总RNA提取技术研究

棉花抗虫Bt基因克隆技术第一步就是从抗虫Bt基因特异性表达的幼叶中提取总RNA,基因的表达可以在RNA产生的不同阶段进行调控,纯化完整的总RNA是进行基因表达研究和从cDNA克隆新基因的基础.对比分析了CTAB-licl法、改良异硫氰酸胍一步法、Trizol一步法和试剂盒提取方法4种RNA提取技术,经琼脂糖凝胶电泳谱带结果检验和紫外分光光度计检测,发现前2种方法很难提取到理想的RNA,而后2种提取的RNA完整性较好,但用RNA Out试剂盒提取的RNA更加适用于反转录cDNA.     

六种核酸提取试剂盒对粪样中小鼠肝炎病毒核酸 提取效率的比较

目的 比较六种商品化试剂盒在小鼠粪便中提取小鼠肝炎病毒(MHV)RNA的效率,筛选出效率高、耗时短的核酸提取方法。方法 采集感染MHV小鼠的新鲜粪便样本,分别用液氮研磨法、磁珠匀浆法以及PBS溶解离心法进行处理,通过同一核酸提取试剂盒比较病毒核酸提取效率,明确最佳样本前处理方法;之后,用6种试剂盒进行RNA提取,经反转录后进行TaqMan实时定量PCR检测,以Ct值评价6种试剂盒的提取效率,结合产物测序和血清抗体ELISA结果,筛选MHV的最佳核酸提取方法。结果 对于粪便样本的前处理,液氮研磨法的RNA提取效率显著高于磁珠匀浆法。对于6种试剂盒的提取效果,TIANGEN DP422[总RNA浓度：(549.70±52.38) ng/μL,Ct值：(24.51±0.10)]核酸提取效率最高;TIANGEN SD101[总RNA浓度：(274.13±6.87) ng/μL,Ct值：(2.39±0.017)]和QIAGEN 52904[总RNA浓度：(288.13±15.11) ng/μL,Ct值：(2.40±0.012)]用时最短;XS VRL[总RNA浓度：(348.80±15.85) ng/μL,Ct值：(24.70±0.13)]操作最为方便。结论 粪便样本前处理建议采用液氮研磨法。针对粪便中MHV RNA的提取,TIANGEN DP422提取效率最高,推荐用于小鼠肝炎病毒的分子生物学检测。     

样品保存温度和时间对总RNA提取的影响

目的:保障提取总RNA质量的前提下探索一种保存样品的适宜方法。方法:Trizol法(试剂盒)提取缺血复灌后肾组织总RNA。缺血45分钟后再灌注的大鼠肾脏,按照不同保存方法将样品分成四组,第一组液氮处理后立即提取总RNA;第二组-20℃冻存1天后提取总RNA;第三组-20℃冻存1周后提取总RNA;第四组液氮处理后1周后提取总RNA,然后检测各组RNA含量。结果:第一组RNA含量最多,第三组提取总RNA的含量最少。结论:提取总RNA的肾组织样品最佳保存方法是获得组织后立即提取总RNA,或者经液氮处理后保存在-20℃,一周后仍可获得较多含量的总RNA。     

萝卜叶片总RNA提取方法比较

获得高质量的RNA是进行RNA相关分子生物学实验和研究的前提.尽管目前已建立了多种真核生物总RNA的提取方法,但这些方法是否适用于提取萝卜(Raphanus sativus L.Var.radiculus Pers.)的总RNA还不清楚.本研究分别采用Trizol法、改进的异硫氰酸胍法和改进的SDS--酸酚法提取萝卜叶片总RNA,并通过分析所得RNA的电泳图谱、得率和纯度来判断这三种方法的优劣, 确定了提取满身红萝卜总RNA的最适方法.实验结果表明,Trizol法和改进SDS酸酚法提取的总RNA中蛋白质和DNA污染比较严重,不能用于下一步实验;而改进的异硫氰酸胍法提取的总RNA得率高、纯度高、完整性好、少降解,完全适合用于Northern blotting,小RNA分离、cDNA文库的构建等分子生物学实验.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~