苜蓿花叶病毒RNA2 3''''端cDNA转基因烟草及其抗病性研究

将本室克隆的编码复制酶基因3′端约1／2序列及其3′端非编码区的苜蓿花叶病毒中国分离株(AIMV-Ch)RNA：3′端cDNA，重组到植物表达载体pROKⅡ中，通过致瘤农杆菌(Agrobacterium tumefaciens)介导，以叶圆片为转化材料，转化普通烟草，并获得了转基因植株．经卡那霉素抗性选择、PCR检测目的基因证明．AIMV RNA：3′端基因已整合到转基因烟草的基因组DNA中．转基因植物的攻毒试验表明转基因植株对苜蓿花叶病毒产生高水平的抗性．     

苜蓿花叶病毒复制酶基因全长cDNA植物表达载体的构建和对烟草的转化

将苜蓿花叶病毒中国分离株(Alfalfa mosaic virus Chinese isolate，A1MV-Ch)的复制酶P2亚基(90 kD蛋白)基因的全长cDNA构建到植物表达载体pROKⅡ中，得到重组植物表达载体pAIMV-FL．用三亲融合法导入农杆菌LBA4404，并转化烟草，经PCR检测，获得了含全长cDNA的转基因烟草植抹．     

烟草花叶病毒两株系的生物学和寄主病生理的比较研究

利用烟草花叶病毒普通株系（ＴＭＶ－ｏｍ）和来自新疆辣椒上的ＴＭＶ黄白卷叶株系（ＴＭＶ－ｗｙｒ）进行了比较研究。结果表明：两株系除引起辣椒和三生烟症状不同外,亦导致其他性状上的差异。ＴＭＶ－ｗｙｒ的致死温度为６０～７０℃,稀释限点１０－４～１０－５;辣椒病组织中产生大量病毒粒子的聚集体、网膜结构和分散的病毒粒子,叶绿体呈筒状;粒体大小为２５８×１６ｎｍ,ＴＭＶ－ｏｍ在辣椒病组织中只形成病毒粒子聚集体,叶绿体呈球状。辣椒酶谱分析表明：ＴＭＶ－ｏｍ接种株ＰＯＤ同工酶的活性（３条深色带）显著大于ＴＭＶ－ｗｙｒ接种株（１条深色带）。由此我们认为这些生物学性质和病生理差异可作为区分ＴＭＶ－ｗｙｒ和ＴＭＶ－ｏｍ的诊断指标。     

苜蓿花叶病毒复制酶基因全长cDNA植物表达载体的构建

将苜蓿花叶病毒中国分离株（Alfalfa mosaic virus Chinese isolate，AlMV-Ch）的复制酶P2亚基（90KD蛋白）基因的全长cDNA构建到植物表达载体pROK Ⅱ中，得到重组植物表达载体pAlMV-FL．     

菠菜抽提物对烟草花叶病毒抑制作用的研究

以心叶烟为指示植物，测定了菠菜、灰藜、甜菜、甘草、莫合烟、苦豆子６种植物的叶片抽提物对烟草花叶病毒（ＴＭＶ）的抑制作用，其中菠菜抽提物的抑制作用最明显，对烟草花叶病毒抑制率达９６．４５％。初步研究了菠菜粗提液抑制ＴＭＶ的作用机制及其影响因素。结果表明，菠菜抽提物是一种抑制病毒侵染的物质，只有通过寄主后才能发挥作用，而对病毒本身并不起作用，有许多因素可以影响菠菜抽提物的活性，强酸强碱（ｐＨ＜４．５或ｐＨ＞１０．５）可以明显抑制菠菜抽提物的活性，分别使其活性下降６６．７％和５１．９％；当水浴温度超过６０℃时，菠菜抽提物的活性明显下降，而３０℃～５０℃水浴处理时，则其活性不变；菠菜抽提物原液稀释度大于５００倍时，则对ＴＭＶ的抑制率降低，用不同浓度的乙醇处理菠菜抽提液，随浓度增高，抑制率降低，当大于７５％以上时，其抑制率降低７５．６３％以上。     

苜蓿花叶病毒RNA_23′端cDNA转基因烟草及其抗病性研究

将本室克隆的编码复制酶基因3′端约1/2序列及其3′端非编码区的苜蓿花叶病毒中国分离株(AlMV-Ch)RNA23′端cDNA,重组到植物表达载体pROKII中,通过致瘤农杆菌(A-grobacteriumtumefaciens)介导,以叶圆片为转化材料,转化普通烟草,并获得了转基因植株.经卡那霉素抗性选择、PCR检测目的基因证明AlMVRNA23′端基因已整合到转基因烟草的基因组DNA中.转基因植物的攻毒试验表明转基因植株对苜蓿花叶病毒产生高水平的抗性.     

邻联茴香胺—H2O2—辣根过氧化物酶伏安酶联免疫分析检测四种 …

将邻联茴香胺（ＯＤＡ）－Ｈ２Ｏ２－辣根过氧化物酶（ＨＲＰ）伏安酶联免疫分析体系于测定南芥菜花叶病毒、黄瓜花叶病毒、南方菜豆花叶病毒和芜菁地病毒等四种重要植物病毒,其灵敏度高地酶联免疫吸附显色光度法（ＥＬＩＳＡ）。     

侵染油菜的黄瓜花叶病毒的初步研究

ＣＭＶ是侵染油菜的主要病毒之一。１９９５年武昌采集到一种（命名为ＣＭＶ－ＢＷ）引起油菜花叶畸形的样品，引起苋色藜局部枯死斑。ＣＭＶ－ＢＷ和ＣＭＶ－ＣＡ（花生株系）抗血清起强阳性反应，与同一病毒性的花生矮化病毒（ＰＳＶ）抗血清起阴性反应。基于以上性质，ＣＭＶ－ＢＷ经鉴定属于黄瓜花叶病毒。通过应用生物学（寄主反应和温度敏感性）实验与ＣＭＶ－Ｓ、ＣＭＶ－Ｄ对比，参试的分离物在３２℃下引起昆诺藜（Ｃ．ｑｉ     

核酶转基因载体的构建及在烟草原生质体中对TMV感染的抑制 …

设计切割烟草花叶病毒ＲＮＡ的锤头型核酶Ｒｚ－２，分别以ｐＫｙＬｘ７和ｐＢｉｎ１９为载体，构建含Ｒｚ－２基因及核酶和底物连接的ＲｚＳｂ－２基因的重组质粒，通过三亲交配将目的基因转入土壤农杆菌中的Ｔｉ质粒。     

苜蓿花叶病毒复制酶基因的克隆、序列分析及其植物表达载体的构建

以侵染苜蓿的苜蓿花叶病毒中国分离株(Alfalfa mosaic virus Chinese isolate，A1MV—Ch)RNA2为模板，利用人工合成的特异性引物，进行反转录及PCR扩增，分两段分别扩增了复制酶基因的5′端1．32kb和3′端及其非编码区的1．23kb cDNA序列．用限制性内切酶切割PCR产物后，与pUCl9重组，转化大肠杆菌DH5α，筛选重组质粒，用限制性内切酶分析及PCR鉴定，得到分别含有5′端序列和3′端序列的重组质粒。已由上述两种重组质粒构建了含有完整复制酶基因的重组质粒．进行了全序列测定，并与国外报道的A1MV-425株系的相应序列相比较，其复制酶基因编码区核苷酸序列同源性达97．8％，推测的氨基酸序列的同源性达97．6％，3′端非编码区核苷酸序列同源性为98．2％．并将全长复制酶基因与植物表达载体pROKⅡ重组，得植物转化载体pAlMV—FL．     

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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