植物耐盐研究进展

从盐胁迫对植物生长发育及生理代谢的影响,植物的耐盐机理以及利用基因工程手段改良作物耐盐性等方面,对近年来植物耐盐研究的一些进展进行了综述,并对植物耐盐研究进行了展望.     

植物耐盐相关基因克隆与基因工程的研究进展(综述)

盐渍化是影响植物生长和发育的主要环境因素之一,而基因工程为耐盐新品种的选育通过了一条新途径。很多耐盐基因已经被克隆和详细研究。笔者就与耐盐性相关的渗透调节物质合成关键基因、盐胁迫信号传导以及与相关的调控元件和因子的克隆及其基因工程应用的研究进展作了概述,以期为相关人员的研究提供参考。     

作物耐盐性的分子生物学研究进展

本文从作物耐离子胁迫、耐渗透胁迫和细胞编程性死亡调节三个方面概述了作物耐盐的生理生化机制;介绍了目前利用分子生物学技术克隆与植物耐盐相关的基因,并根据作物的耐盐机理,对这些与耐盐相关的基因进行了分类;总结分析了转耐盐基因植物的研究现状及其转基因植物的耐盐生状况,并提出了利用转基因技术,改良植物耐盐性的方法和对策。     

植物耐盐的生理生态适应性研究进展

 植物耐盐机制的研究对盐渍土改良利用和选育培育耐盐植物新品种具有重要意义。盐分胁迫下,植物表现一系列生理生态适应性变化。根据近年来对植物耐盐的研究,本文重点阐述了植物体内渗透调节、抗氧化酶活性、光合途径的转变、激素信号转导、植物体内相关蛋白的高表达、形态结构的改变等耐盐的生理生态适应性机制。进一步分析表明,植物耐盐的适应性受多方面调节和控制,应该把多方面的因素都联系起来综合考虑。     

耐盐分胁迫的生物学机理及其基因工程研究进展

介绍了盐分胁迫对植物的伤害、植物耐盐的生物学机理以及通过基因工程改良作物耐盐性的研究进展     

黄河三角洲地区耐盐植物研究进展与展望

黄河三角洲地区土壤盐碱化程度高,引进耐盐植物改良该地区盐碱地是一种"治标又治本"的办法.但耐盐植物种类繁多,耐盐机制复杂,盲目引种只能加重生态破坏,因此,加强黄河三角洲地区盐碱地现状调查研究,改良培育适宜的耐盐植物是目前研究的重点.本文综述了黄河三角洲地区现状、耐盐植物种类特点、耐盐机制以及目前研究存在的问题和解决方法,为黄河三角洲地区耐盐植物的研发及盐碱地植物改良提供理论支持.     

植物耐盐突变体筛选与耐盐转基因研究

随着土壤盐渍化的日益加剧,农业生产的可持续发展受到威胁.人们从改良盐渍土和植物耐盐育种两个方面寻求解决问题的途径.对现有植物物种进行耐盐性筛选和利用现代生物技术创造新的耐盐品种是进行植物耐盐育种的两种主要方法.随着对植物耐盐分子机制研究的不断深入和转基因技术的不断完善,利用现代生物技术方法培育高效耐盐作物品种已成为当今的研究热点.本文对近年来有关植物耐盐突变体筛选、耐盐相关基因的克隆和转基因研究进行了分析讨论.     

植物耐盐性研究进展

对近年来植物在盐环境下所受的伤害和植物的耐盐机理的相关研究作一综述,以期为深入揭示植物耐盐机理,筛选耐盐植物新品种提供参考依据.     

植物液泡膜H~+-Pyrophosphatase基因功能研究进展

植物液泡膜H+-PPase是一种区别于H+-ATPase的质子泵,广泛存在于生物体内.该文重点介绍植物液泡膜H+-PPase基因及同源基因的结构和功能方面的研究进展,以及该基因在不同植物上遗传转化体系的建立,并展望了该基因应用于植物耐盐抗旱基因工程中的前景.     

生命科学及其相关学科研究取得的新成果

简要介绍了生命科学及其相关学科研究取得的成果,包括运用遗传工程使玉米产出特殊蛋白、运用基因工程培育耐寒耐盐植物、在猪体内导入外源基因而减少脂肪增加瘦肉、运用现代生物技术破案、转基因分子治癌、攻克乙肝研究及降低器官移植排斥反应等。     

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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