扩展青霉(Penicillium expansum)PF898基因组DNA提取方法的比较

利用CTAB法、SDS改进法和SDS快速法3种DNA提取代表性方法,对扩展青霉(Penicillium expansum)PF898基因组DNA的提取进行比较研究.CTAB法提取的DNA样品纯度最高,SDS裂解法制备的DNA得率最高;CTAB法和SDS改进法所得DNA都可直接应用于限制性酶切分析;3种方法所提取的DNA均能满足扩展青霉PF898脂肪酶基因和18S rRNA的PCR扩增.总体而言,SDS法简便、快速、得率高,是一种理想的扩展青霉基因组DNA提取方法.     

蒲公英药材总DNA的提取

采用改良的CTAB法、SDS法、高盐低pH法提取蒲公英药材基因组总DNA,通过紫外吸收、琼脂糖凝胶电泳检测其纯度与浓度.结果表明,改良的CTAB法所得DNA纯度最高,电泳条带最清晰、完整性好,可作为RAPD,ISSR等分子生物学研究.     

棉花枯萎菌gDNA不同提纯方法的比例研究

以棉花枯萎菌菌株为试验材料,在CTAB法,SDS－CTAB法等基础上国以改进,对4种提纯棉花枯萎菌DNA的方法进行了比较研究,结果表明,SDS－CTAB法是适合于棉花枯萎菌DNA提取的方法,该方法提取的DNA纯度高,产率高,无明显降解现象,能很好地被限制性内切酶酶切,并用作PCR模板,同时对DNA提取过程中的细节问题进行了探讨与分析。     

葡萄总DNA提取方法的比较研究

以葡萄幼叶为材料，分别采用溴化十六烷基三甲基铵(CTAB)法、高盐低pH法、简易法、高盐沉淀法和改良十二烷基硫酸钠(SDS)法5种方法提取总DNA，通过A260／A280值、琼脂糖凝胶电泳和RAPD对5种方法所得DNA溶液进行定量、定性分析和综合比较。结果显示高盐低pH法、高盐沉淀法综合效果较好，改良SDS法所得DNA纯度最佳。因此，在实际工作中还应根据实验目的选取最适合的方法。     

建兰DNA的快速提取

用SDS高盐提取介质简便快速提取建兰(Cymbidiumensifolium)嫩叶DNA.提得的DNA分子大小约为48kb,A260/A280=1.77～1.86,DNA得率为每g鲜叶410～1145μg.提取的DNA无需经RNase处理,可直接用于限制性内切酶酶切和随机扩增多态DNA反应.     

从动物血液中提取基因组DNA方法的比较研究

从血液中提取基因组DNA的传统方法是先得到淋巴细胞,再用蛋白酶K、SDS消化,然后用酚、氯仿抽提,乙醇沉淀．CTAB法提取基因组DNA多应用于植物和微生物,从全血中提取基因组DNA报道甚少．采用改良的CTAB法从全血中提取基因组DNA,并以传统方法和TAKARA Blood Genome DNA Extraction Kit作对照．结果表明：CTAB法可以得到大量的、较完整的基因组DNA,并且纯度达到1．8～2．0,可以满足PCR扩增和限制酶切等实验的要求．     

一种提取植物基因组DNA的方法——改良尿素法

介绍了一种从玉米和水稻叶片中提取高质量基因组DNA的改良尿素法．与其他常用方法如CTAB法、SDS法等相比,这种改良方法具有产率高、快速省时、可常温操作、成本耗用低等优点．结果证明,采用这种改良方法获得的基因组DNA纯度高、浓度大,适合用于限制性内切酶的酶切反应、基于PCR基础上的遗传多样性分析、基于传统的Southern杂交的遗传图谱分析以及其他下游分子生物学研究,是一种适于植物基因组DNA制备方法,值得推广的．并针对基因组制备过程中经常出现的难题,分析了产生的原因,提出了具体解决办法．     

濒危植物翅果油树DNA的提取方法及纯度检测

为从翅果油树(Elaeagnus mollis Diels)叶中提取高质量的基因组DNA,用PVP和TNE洗液预处理样品并筛选出合适的清洗次数,比较了SDS法、CTAB法和改进CTAB法3种DNA提取方法.结果表明:TNE和PVP预处理三次并且采用改进的CTAB法更适合于翅果油树基因组DNA提取.该方法提取的DNA经紫外分光光度法检测,其A260/A280为1.82,优于CTAB法(1.59)、SDS法(1.00).琼脂糖凝胶电泳和PCR扩增结果也得出同样的结论.     

枣树基因组DNA提取方法及RAPD体系的建立

以8个枣树品种的嫩叶为材料,比较了不同的DNA提取方法,结果表明：采用改良的CTAB法提取的DNA纯度和产率,虽然不比改良SDS的高,但适宜RAPD分析．在20μL反应体积中,RAPD分析的优化反应体系为：引物0．2pmol·L^-1、Mg^2＋2．0mmol·L^-1、dNTP200μmol·L^-1、TaqDNA聚合酶1．2U．改良的CTAB法是枣树RAPD分析基因组提取DNA的最好方法．     

木麻黄小枝基因组DNA的快速提取研究

提取介质中加入2.5% β-巯基乙醇, 能有效去除次生物质对木麻黄基因组DNA提取的影响.用新建方法所提DNA产率比用前人方法提的高出0.8倍左右.鉴定结果表明:鲜小枝、干小枝的DNA样品皆为48kb左右,适于限制性酶切和RAPD反应; 同时发现同一株树的鲜小枝、干小枝,基因组DNA RAPD扩增可得到相同的产物.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has