地毯草ISSR反应体系的建立与优化

在利用ISSR技术对地毯Axonopus compessus(Sw.)Beauv.种质资源的遗传多样性进行研究的实验过程中,对影响PCR扩增效果的一些因素诸如DNA的提取、模板DNA质量浓度、Taq酶的选择及其用量、Mg2 浓度、dNTP的用量以及退火温度等指标进行筛选和优化,筛选优化出可用于地毯草ISSR-PCR分析最适宜的PCR反应条件:10μL PCR反应体积中,10×Taq酶配套缓冲液(10 mmol/L Tris-HCl,ph9.0,50mmol/L KCl,0.1%Triton X-100),0.75 U Taq DNA聚合酶(上海申能博彩),0.375 μmol/L引物,180μmol/L dNTP,1.5～2.0 mmol/LMgCl2,10ng模板DNA.     

中国鲎微卫星引物扩增圆尾鲎DNA的PCR反应体系优化

采用正交设计法,从dNTPs浓度、引物浓度、Mg2+浓度、Taq DNA聚合酶用量4个因素3个水平出发,优化设计圆尾鲎DNA的PCR反应体系(引物为中国鲎微卫星引物).并采用直观分析方法分析正交试验结果,最终建立了圆尾鲎SSR-PCR最佳反应体系:总体积20μL,Taq DNA聚合酶1.5 U、dNTPs 0.16 mmol/L、引物0.2μmol/L、Mg2+2.0 mmol/L;并通过PCR梯度实验进一步优化模板DNA质量浓度、退火温度及退火时间,获得最佳反应条件:模板DNA质量浓度为30 ng/μL,退火温度为48℃,退火时间为20～25 s.对最佳反应体系和反应条件进行了检验,结果显示该反应体系稳定性高、重复性好.     

红树植物海漆ISSR条件的优化

在利用ISSR分析对海漆Excoecaria agallocha的遗传多样性进行了研究.为获得清晰、重复性的ISSR扩增结果,对影响ISSR-PCR的多个因素,包括DNA的提取、模板浓度、TAQ酶的选择与用量、Mg2 和dNTP浓度等进行了比较、优化,确定了海漆ISSR-PCR分析最适宜的扩增条件:10μL PCR反应体积中,1×Taq酶配套缓冲液(10 mmol/L Tris·HCl,pH 9.0,50mmol/L KCl,0.1%Triton X-100),0.6～0.7 U Taq DNA聚合酶(上海申能博彩生物科技有限公司),0.2 μmol/L 引物,0.2 mmol/L dNTP,1.5～2.0 mmol/LMgCl2,10 ng模板DNA.     

正交设计优化山茱萸ISSR-PCR反应体系研究

利用正交试验设计法,从引物浓度、TaqDNA聚合酶浓度、Mg2 浓度和dNTP浓度4种因素3个水平,对山茱萸ISSR-PCR反应体系进行优化分析,并在此基础上对模板DNA浓度、PCR反应过程中的退火温度进行梯度检测.结果表明,20 μL ISSR-PCR反应体系中各因素的最佳浓度分别为:1×PCR buffer、150 μmol/L dNTP、1.0 μmol/L引物、2.5 mmol/L Mg2 和2.0 U TaqDNA聚合酶,最佳模板DNA浓度为20～80 ng,引物UBC835的最佳退火温度为57.2℃.     

五条蚋ISSR-PCR反应体系的建立与优化

通过正交试验及单因素试验对五条蝻S.quinquestriatum ISSR-PCR反应体系中的引物、DNA模板、dNTP、Mg2+、BSA、Taq DNA聚合酶浓度6个关键因素进行优化,建立五条蚋ISSR最适反应体系:20μl反应体系中引物1.0 μmol/L、DNA模板50.0 ng/μl、dNTP 0.15 mmol/L、Mg2+ 1.50 mmol/L、BSA 2.00 mg/ml、Taq DNA聚合酶0.155U/μl.通过对24条备选引物进行温度梯度筛选,获得8条能够稳定扩增且多态性较好的引物.为今后利用ISSR技术进行五条蚋种群遗传多样性研究奠定了良好的技术基础.     

华山松ISSR反应体系的优化

为获得条带清晰、稳定和多态性高的华山松ISSR扩增结果,对引物、Mg~(2+)浓度和退火温度等因素进行了优化.确定了ISSR分析的最佳PCR条件:15μL反应体系中,10×PCR buffer反应缓冲液1.5μL,模板DNA 22.5 ng,Mg~(2+)2.2 mmol/L,d NTPs 0.23 mmol/L,引物0.93μmol/L,Taq DNA聚合酶0.027 U/μL.PCR反应程序为:经94℃预变性4min后,经过94℃变性30 s,Tm-4.8℃退火30 s,72℃延伸108 s共33个循环;循环结束后72℃延伸10 min.从44条ISSR引物中筛选出12条扩增稳定、多态性丰富的ISSR引物.对华山松ISSR实验优化体系的建立,为今后利用ISSR分子标记技术开展华山松种间遗传变异分析和构建遗传图谱等研究奠定了基础.     

泽泻ISSR反应体系的建立与优化

以四川泽泻为实验试材,采用改进的CTAB法提取了泽泻的高质量总DNA模板,克服了泽泻中所富含的酚类物质的影响.对泽泻ISSR反应体系中各个主要影响因子进行了优化和筛选,建立了标记位点清晰、稳定、重复性好、可用于泽泻ISSR-PCR分析的最适反应体系,它们是:25μL PCR反应体系中,10×Taq酶配套缓冲液,1U Taq DNA聚合酶,1.8~2.0 mmol/L MgC l2,100μmol/L dNTP,0.3μmol/L引物,DNA模板约10~20 ng,退火温度在52~60℃;为进一步研究泽泻居群的ISSR分子标记鉴别奠定了基础.     

真藓(Bryum argenteum)ISSR-PCR反应体系优化及引物筛选

为了确定真藓最佳ISSR-PCR反应体系,采用PCR正交实验设计方法,对影响ISSR-PCR试验的模板DNA、引物、d NTPs、Mg2+、和Taq DNA聚合酶5个因素在4个水平上进行优化,并对100条引物逐一进行温度梯度PCR,筛选合适的引物并确定每个引物的最佳退火温度.结果显示优化的20μL ISSR-PCR反应体系中包括20 ng/20μL DNA模板、0.45μmol/L引物、2.65 mmol/L Mg~(2+)、0.4 U/20μL Taq DNA聚合酶、0.45 mmol/Ld NTPs.利用该体系最终筛选出50条扩增条带清晰,重复性好,多态性高的引物并确定其退火温度.这一体系的建立、引物的筛选及退火温度的确立为进一步利用ISSR分子标记技术对苔藓遗传多样性的研究提供理论基础.     

长蛸ISSR-PCR优化反应体系的建立及优化研究

以长蛸DNA为模板,利用单因子试验分别对影响长蛸ISSR-PCR反应的DNA浓度、Taq DNA聚合酶、Mg2+、dNTPs和引物的浓度进行了优化,并通过梯度PCR确定最适退火温度,最终确定长蛸最佳反应体系和PCR扩增程序为:25μL体系,其中包括Taq DNA聚合酶1.5 U,Mg2+2 mmol/L,dNTPs 0.15 mmol/L,引物0.4μmol/L,DNA模板量约50 ng确立退火温度为52℃。利用所建立的ISSR-PCR反应体系,通过对24份野生长蛸样本的检验,获得了清晰、重复性好、多态性高的条带,研究结果对于把ISSR标记技术引入研究长蛸不同地理群体遗传多样性和遗传结构具有重要意义。     

赤松ISSR-PCR反应体系的建立与优化

为了建立赤松ISSR-PCR反应体系,利用正交试验分别对影响赤松PCR反应的dNTP浓度、Mg~(2+)浓度、Taq酶浓度、引物浓度、模板浓度进行了优化,并通过梯度PCR确定引物的最佳退火温度和循环次数.最终确定赤松ISSR-PCR最佳反应体系及扩增条件为:25μL反应体系中含2.5μL 10×PCR Buffer、3 mmol·L~(-1)dNTP、1.5 mmol·L~(-1)Mg~(2+)、0.5 U Taq酶、0.3μmol·L~(-1)引物、9 ng模板;扩增程序为:94℃预变性5 min,然后进行94℃变性30 s,55℃退火45 s(退火温度随引物不同而变化),72℃延伸2 min,35个循环,最后72℃延伸7 min.这一ISSR-PCR反应体系,为今后利用ISSR技术对赤松进行物种分类鉴定奠定了基础.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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

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