一种从小麦干种子中快速提取DNA的优化方法

对植物组织DNA抽提是在分子水平上对植物进行系统分析与研究的基础性工作．本文提供了一种从小麦干种子中快速提取总DNA的优化方法．该方法不需液氮冷冻或是冻干组织脱水和水浴，用氯仿对材料进行预处理。使用1．5％的SDS抽提缓冲液和氯仿／异戊醇处理，并用预冷的无水乙醇沉淀DNA，即可在短时间内得到小麦基因组总DNA．实验证明，用该方法每300mg干种子可得到约30-40μg的总DNA，其产量和质量均适合进行SSR分析．     

大孔树脂吸附和纯化蒲黄总黄酮的工艺研究

以主成分香蒲新苷及异鼠李素-3-O-新橙皮糖苷含量为指标，研究了HZ802非极性大孔树脂吸附和纯化蒲黄总黄酮的工艺条件。结果表明HZ802非极性大孔树脂对蒲黄总酮有良好的吸附纯化性能，其优化的工艺条件为：样品溶液的浓度为50mg／mL(生药量／体积)；树脂用量为生药量的1．5倍(质量比)；纯化先用2倍树脂柱体积的水，再用2倍树脂柱体积φ=0．2的乙醇；总黄酮的洗脱用2倍树脂柱体积φ=0．5的乙醇；吸附和洗脱流速均为2mL／min。     

艾美耳属球虫卵囊基因组DNA不同提取方法的比较

为了获得高质量的艾美耳属（Eimeria）球虫卵囊基因组DNA,采用了4种不同方法提取3种艾美耳属球虫卵囊的基因组DNA．对比结果表明,采用机械法破裂球虫卵囊壁,用裂解液裂解孢子囊和子孢子,释放出DNA,在保持碱性的环境下（pH=8．0）,以苯酚-氯仿异戊醇抽提,乙醇沉淀,可获得高质量的DNA分子,经PCR检验为艾美耳属球虫卵囊基因组DNA．     

几种DNA提取方法对红树植物秋茄叶片DNA提取效果的比较

以红树植物秋茄叶片为实验材料,美人蕉叶片为对照材料,采用6种不同的DNA提取方法,比较不同方法的DNA提取效果。结果表明：针对红树植物优化的CTAB法（方法 6）通过PVP的除酚去多糖作用,利用CTAB提取液和氯仿-异戊醇强效除蛋白和脂类物质,结合高盐环境下异丙醇高效沉淀DNA去除多糖,最终达到彻底去除杂质,得到高纯度的基因组DNA,是6种方法中最适合用于红树植物DNA的提取方法。     

一种从富含次生物质的植物中提取RNA的方法

该实验以草莓为材料,建立了一种适合于提取富含多酚、多糖等次生物质的植物RNA的方法,此方法在酸性条件下用苯酚／氯仿／异戊醇进行抽提去除DNA,并用乙二醇丁醚来除去植物组织提取液中的多糖、多酚等次生物质,得到了质量很好的RNA样品。     

正交试验优化马面tunNavodon septentrionalos卵巢磷脂的提取条件

用正交试验探讨了从马面tun卵巢中提取磷脂的方法，得到最佳工艺条件：提取剂用量为样品重14倍，提取剂中氯仿与甲醇体积比2：1，抽提时间4h，洗涤分层时加滤液体积一半的15NaCl溶液，其中前三个因素对实验结果有显著影响。     

超声波提取黄芪中总黄酮工艺研究

研究比较了超声波法、微波法、乙醇提取法等工艺提取黄芪总黄酮的效果,得出超声波法提取黄芪总黄酮的工艺最佳．以提取温度、提取时间、料液比、乙醇体积分数为考察因素,黄芪总黄酮提取率为考察指标,采用止交试验法优化黄良总黄酮提取工艺．结果表明,最佳工艺条件为：超声波提取温度为65C、提取时间30min、料液比为1：15（g／mL）、乙醇体积分数为65％,总黄酮的提取率为0．418％,是微波提取法的1．31倍,乙醇提取的1．69倍．     

正交试验优化马面 Navodon septentrionalos 卵巢磷脂的提取条件

用正交试验探讨了从马面卵巢中提取磷脂的方法，得到最佳工艺条件：提取剂用量为样品重 14倍 , 提取剂中氯仿与甲醇体积比 2∶ 1, 抽提时间 4 h，洗涤分层时加滤液体积一半的 1 ％ NaCl溶液 ,其中前三个因素对实验结果有显著影响。     

正交试验优化马面鲀Navodon septentrionalos卵巢磷脂的提取条件

用正交试验探讨了从马面■卵巢中提取磷脂的方法，得到最佳工艺条件：提取剂用量为样品重 14倍 ,提取剂中氯仿与甲醇体积比 2∶ 1,抽提时间 4 h， 洗涤分层时加滤液体积一半的 1％ NaCl溶液 ,其中前三个因素对实验结果有显著影响。     

正交试验优化马面Navodon septentrionalos 卵巢磷脂的提取条件

用正交试验探讨了从马面卵巢中提取磷脂的方法，得到最佳工艺条件提取剂用量为样品重14倍,提取剂中氯仿与甲醇体积比2∶1,抽提时间4h，洗涤分层时加滤液体积一半的1％NaCl溶液,其中前三个因素对实验结果有显著影响。     

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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