脆江蓠营养细胞超微细胞的研究

脆江蓠营养细胞超微结构观察结果表明：营养细胞每一色素体内含有一条围周类囊体、４￣１０条平行类囊体和一些质体小球。平行类囊体数目与细胞所处的部位有关。内质网呈环形片层结构。同心圆膜状体具有１或２个核心。色素体在末端进行分裂，分裂时平行类囊体数目增多，幼色素体被膜直接内陷形成平行类囊体。以后发育出围周类囊体。     

幼叶黄化油菜(Brassica napus L.)突变体Cr3529叶绿体超微结构观察

对油菜Cr3529叶片细胞中的叶绿体数目及结构进行了显微及亚显微观察。结果显示，突变与野生型细胞中叶绿体的数目没有显著性的差异，但叶绿体的结构有较大的差异，较之正常油菜，Cr3529油菜叶绿体基粒类囊体数较少，基质类囊体数较多，而且，在基粒类囊体中基粒片层数也较少，大部分基粒只有几个片层，基粒的平均片层数为5．46，约为野生型的一半，作者认为，较少的基粒片层数可能是引起Cr3529油菜叶绿素含量减少，并最终导致植株显著减产的重要原因。     

预处理对辣椒根尖细胞染色体制片的影响

该实验以中椒四号辣椒为实验材料,用常规压片法制备辣椒根尖细胞染色体标本．研究了短时间温度预处理对辣椒根尖细胞有丝分裂活性的影响,并比较了不同的预处理剂和冰水预处理时间对中期分裂相的影响．结果表明,经28℃非离体升温处理3h,冰水预处理24h、辣椒根尖可以获得数目较多、分散均匀的辣椒根尖细胞染色体早中期分裂相．     

伪东方罂粟愈伤组织细胞核型研究

本文研究了伪东方罂粟（Ｐａｒａｖｅｒｐｓｅｕｄｏｏｒｉｅｎｔａｌｅ）愈伤组织细胞核型的变化特点，结果证明培养初期的愈伤组织细胞经常发生染色体的大量丢失．继代培养两个月的愈伤组织细胞染色体数目变化较大，培养３个月、４个月、５个月以后染色体数目减少到２１条时趋于稳定，经对各个时期细胞的２１条染色体测量分析，证明这些细胞不是真正的单倍性细胞．随着培养时间的延长，染色体的结构变化也越大．在每一个具有２１条染色体的细胞中发现都有一条较长的具中部着丝粒的染色体．     

高压静电场对豌豆根尖影响的细胞学研究

对经１５ｋＶ恒电场处理的豌豆根尖分生组织细胞进行了细胞学研究。结果显示经处理的根尖细胞具有不正常的细胞分裂，如频率高的多核细胞，出现频率为１．３％，同一细胞不同核的分裂不同步；多极分裂；染色体的畸变如染色体的断裂与染色体数目的减少以及微核的产生。     

肉苁蓉(CistanchedeserticolaMa)胚胎学研究Ⅱ.胚和胚乳的发育

肉苁蓉为细胞型胚乳，初生胚乳核第一次分裂即形成细胞壁．具珠孔端胚乳吸器．种子成熟后由３～５层胚乳细胞包围着胚．合子横分裂形成顶细胞和基细胞．顶细胞纵分裂形成二分体和四分体，以后向各个方向分裂形成多细胞原胚．基细胞多次横分裂形成由一纵列细胞组成的胚柄．其胚胎发生属柳叶菜型．成熟种子中，胚仍然处于球形胚阶段．     

豆茶决明(Cassia nomame)的核型分析

报道了豆茶决明（Ｃａｓｉａｎｏｍａｍｅ（Ｓｉｅｂ）Ｋｉｔａｇ）的染色体数目及核型,其根尖细胞染色体数目存在混倍现象,８５％的细胞为１６条染色体,１３％的细胞为２０条染色体,其余２％的细胞为１８、１４、２２条染色体不等．其核型公式为Ｋ２ｎ＝２ｘ＝１６＝１４ｍ＋２ｓｍ,核型类型为１Ａ．     

对减数分裂中染色体复制概念的剖析

由一条染色体变成两条染色体的过程称为染色体的复制．减数第一次分裂（简称减1）的间期只存在DNA的复制以及随后的染色单体的复制，不存在染色体的复制．减数第二次分裂（简称减2）的中期，随着一条染色体的着丝点发生分裂完成染色体的复制，由一条染色体变成两条染色体．     

人小肠癌转移腹水细胞系HICMA的核型分析

采用ＴｄＲ同步化的方法，分析了人小肠癌转移腹水细胞系ＨＩＣＭＡ的核型，发现细胞系染色体为数目主要分布于５２－５６条之间，众数为５４条；染色体畸变复杂，在近５０％的分裂相中存在一条端着线粒染色体，ＧＴＧ显带表明该染色体为正常５号染色体去掉整个短臂而成。对染色体畸变与细胞癌变的关系进行了讨论。     

芦苇苗端营养生长阶段的结构变化及淀粉消长规律

芦苇营养苗端在发育过程中始终保持原套原体结构，原套由两层细胞组成。叶原基发生的最初标志是对原基发生位点的两层原套细胞首先进行平周分裂．叶舌发生始于苗端倒数第１０间隔期幼对内侧，由幼叶原表皮细胞及其内侧的基本分生组织细胞共同发育而来。最初的腋芽原基发生于苗端倒数第３间隔期幼叶叶腋内．发生早期出现壳状区结构．壳状区原分生组织表面两层细胞由两层原套细胞衍生而来，不仅能进行垂周分裂，还能进行平周分裂。休眠前夕，芦苇营养苗端的原始细胞区还可通过ＰＡＳ加铁矾苏木精染色显示出来．芦苇营养苗端的淀粉消长规律与其分区结构以及苗端的器官发生均有密切的相关性．越冬前夕，芦苇冬芽生长锥、幼叶中所积累的大量淀粉粒及幼叶中所积累的油滴均有助于增强冬芽的抗寒性．     

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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