重庆地区山蚂蝗属的花粉形态

本文用电子显微镜系统观察了重庆地区山蚂蝗属(Desmodium Desv.)6种植物的花粉形态,其花粉的外形都为长球形,极面观为三裂圆形,具三沟。其外表都具网状纹饰,网脊较光滑。根据网脊的平凸,宽度等特点,将本属的这6个种分成两种花粉类群。1.细网状纹饰,网眼不大规则并不成穴状,网脊高凸,上、下等宽或渐尖,脊宽和眼宽近等。包括的植物种类有Desmodium PodocarPum,D.fallax和D.racemosum等三种;2.网状纹饰较粗,多为网——穴状纹饰,网眼成孔穴状或近穴状,网脊较平坦,脊宽大于眼孔宽。包括种类是D.caudatum,D.sinuatum和D.laxiflorum等三种。其花粉电镜扫描的形态类群与形态解剖特点的分类结果相吻合。     

合肥地区蓼属植物花粉形态的研究

本文用扫描电镜对合肥地区产的蓼属Ｐｏｌｙｇｎｕｍ植物１４种２变种的花粉形态进行了观察。本地区蓼属植物花粉形态有球形、近球形、近长球形及长球形四种类型；萌发器官具三孔沟和散孔两种类型；外壁纹饰有微剌一穿孔一光滑、微剌一凹穴细网状和粗网状四种类型。根据这些特征将该地区花粉划分为４种类型。     

中国野生牡丹花粉形态的研究

通过扫描电镜观察了芍药科(Paeoniaceae)芍药属(Paeonia)牡丹组(Sect.Moutan DC.)9个野生种23个居群的花粉形态.该组花粉多为长球形,少数近球形和超长球形,具三拟孔沟,大小为22.7～46.4 μm×13.6～29.9 μm,外壁纹饰形态多样,可分为穴状、网状、粗网状、条纹-网状、皱波-网状、皱波状.分析结果表明:花粉形态与植物的外部形态特征有一定关系,同一种野生牡丹生长在不同的环境中,其花粉形态也不同.因此,花粉分析对牡丹组种的区分有一定的参考价值,但要合理揭示其系统发育意义,仍需进行更全面深入的研究.     

中国脓疮草属（Panzeria）植物花粉形态的研究

首次用扫描电镜观察了国产胶疮草属（Ｐａｎｚｅｒｉａ）２种１７个供试材料的花粉形态．该属植物花粉形态相对一致，花粉粒长球形、近长球形、长圆球形或扁圆球形；大小为２７．１７μｍ×１９．７７μｍ；具三沟，沟膜上往往具颗粒；外壁具网状纹饰，极少为穿孔－网状纹饰．     

锦鸡儿属(Caragana Farb.)花粉形态研究及其分类学意义

用光学显微镜和扫描电镜对锦鸡儿属4种植物花粉形态进行了观察．花粉粒在赤道面观呈长球形或超长球形，极面观呈三裂圆形，具三孔沟；花粉的表面纹饰为网状；花粉极轴长18．9—25．8μm，赤道轴宽11．7—14．4μm．研究结果表明，锦鸡儿属花粉形态特征支持传统分类的属及属以下各级水平的分类．     

泡桐属植物花粉形态研究

本文应用光学显微镜及扫描电镜对泡桐属五种植物花粉的形态进行了观察,结果表明,该属植物花粉为中等大小,近球形均具三孔沟,表面纹饰为网状．５ 个种之间在花粉大小,网状纹饰,内孔明显与否存在差异,说明花粉的一些形态特征指标可以作为泡桐属植物种之间分类的重要依据．     

华南苦苣苔植物花粉形态的补充研究

对华南苦苣苔植物9个属16个种的花粉进行了扫描电镜的观察和研究.结果显示其花粉形态大多为长球形,少数呈圆球形、超长球形,外壁纹饰为网状纹饰、疣状纹饰、粗糙纹饰、颗粒-穿孔纹饰和刺状-穿孔纹饰.研究结果表明,花粉外壁纹饰特征在苦苣苔科的分类与系统研究方面可能具有较大价值.     

中国接骨木属花粉表面纹饰类型的研究

利用扫描电子显微镜对中国接骨木属12种花粉的表面纹饰进行了观察、拍照,总结出中国接骨木属花粉表面纹饰具有两种类型,分别为穴状纹饰和网状纹饰,为中国接骨木属的系统分类提供了可靠的分类依据.     

中国绢蒿属Seriphidium （Bess.） Poljak. 16种植物花粉形态研究

为了探讨绢蒿属Seriphidium(Bess．)Poljak．植物系统位置及该属植物物种间的系统演化关系,对我国16种绢蒿属植物花粉进行了光学显微镜(LM)和扫描电子显微镜(SEM)下的形态观察．绢蒿属花粉立体形状为近球形或长球形,赤道面观为圆形或椭圆形,极面观为三裂片圆形,极板较小;花粉粒较小,极轴(P)长12．8—31．3μm,赤道轴(E)长11．5—25．3μm,P／E平均值为1．22;具三孔沟,直达两极;多数孔膜不明显;外壁三层,外两层层次清晰;花粉粒两端多为圆弧状;外壁纹饰在光镜下多呈表面粗糙或颗粒状,扫描电子显微镜下以颗粒状-刺状复合纹饰为主．因此,绢蒿属植物花粉形态特征具有较高一致性,种间表现出的特异性为绢蒿属的系统分类提供了有价值的信息．     

山东胡枝子属植物花粉形态研究及其在分类上的意义

报道了山东胡枝子属（Lespedeza Michx.）7种植物花粉的亚显微形态特征,花粉粒从赤道面观呈近长球形,极面观呈三裂圆形,具三条萌发沟;表面纹饰均为网状;花粉粒大小极轴长为26．3－19．0μm,赤道轴宽约为21．7－8．6μm研究结果表明,胡枝子属花粉的形态结构特征支持传统分类中的属和种级水平的分类。     

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     

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