大豆(Glycine max)染色体形态和苏木精染色区的研究

本文采用铁矾——苏木精染色法对大豆有缘分裂前中期的染色体进行了形态学研究,并根据染色体长短、着丝点位置和苏木精染色区等物点排列了染色体组型图。作者注意到大豆染色体的不同部位对苏木精染料的着色程度有明显区别,对此作了较为详细地描述和讨论。     

Ornithogalum virens细胞分裂的观察

本文利用苏木精及石炭酸——品红染色法,对 Ornithogalum virens 的花粉母细胞的减数分裂和根尖细胞有丝分裂过程进行了观察,描述了其细胞分裂过程中染色体在各分裂期的形态。同时,还观察了在减数分裂过程中,核仁的变化。     

荔枝胚性愈伤组织制片方法的简化

采用酒精-HCI(1：1)解离液直接解离和丙酸-铁矾、苏木精染色液染色的简化制片方法，对继代3-20天的荔枝胚性愈伤组织进行染色体数目的检测。结果表明对具有较高有丝分裂指数的胚性愈伤组织，此制片效果好，同时可节省大量的时间和药品，是一种简单、可行的制片办法。     

甜菜(Beta vuigaris L.)染色体形态和带型的研究

本文用铁矾-苏木精染色和Giemsa C-显带方法研究了甜菜染色体。结果表明,甜菜染色体(2n=18)均属中部或近中着丝点,有丝分裂中期染色体平均长度在1.5μ—2.4μ之间,第1号染色体短臂带有随体;根据染色体的长度、着丝点位置和有无随体等特点排列了染色体组型图。C带分析表明所有染色体都显清晰的着丝点带,第6号染色体短臂有末端带,第2、3号有一条明显的中间带。     

荔枝胚性愈伤组织制片方法的简化

采用酒精-HCI(1:1)解离液直接解离和丙酸-铁矾、苏木精染色液染色的简化制片方法,对继代3-20天的荔枝胚性愈伤组织进行染色体数目的检测。结果表明对具有较高有丝分裂指数的胚性愈伤组织,此制片效果好,同时可节省大量的时间和药品,是一种简单、可行的制片办法。     

大葱(Allium fistulosum L.)染色体Giemsa C—带型的研究

本文用铁矾——苏木精染色法分析了大葱染色体组型。结果表明,大葱(2n=16)染色体是中部或近端看丝点,第6号染色休带有随体。根据染色体大小、着丝点位置、有无随体等特点排列了染色体组型图。用修改的Vosa(1972)Giemsa C—带方法研究了大葱的C—带带型。观察到全部染色体都显清楚的瑞带,个别染色体显中间带和着丝点带。第6号染色体显付缢痕带,整个随体被浓染, 大葱(A. fistulosum L.)是石蒜科的一年生或二年生蔬菜作物,原产于东方。目前它作为我国北方的重要蔬菜而大面积栽培。近几年国内外一些作者曾研究过葱属作物的染色体,但他们的工作都没有提到葱。本工作的目的是对大葱的染色体形态和Giemsa C—带带型作一次比较深入系统的研究,为育种工作和探讨亲缘关系提供必要的依据。现将我们的工作报告如下:     

铅对洋葱根尖细胞有丝分裂的影响

用不同浓度的硝酸铅(Pb^2 )溶液分别处理洋葱根尖6h、18h、24h，通过常规染色体压片技术，观察到洋葱根尖细胞的有丝分裂随着浓度的增加和染毒时间的延长，细胞增殖率下降，并且出现了滞后染色体、染色体桥、微核等畸变现象。     

果蝇唾腺染色体四种染色方法的比较

分别用孚尔根染色法、卡宝品红染色法、孔雀绿染色法和苏木精染色法,对果蝇唾腺染色体进行染色,并对四种染色方法通过显微摄影进行对比,结果表明这四种染色方法各有优缺点,并不是每一种方法都普遍适用.从整个实验来看,卡宝品红染色法和孔雀绿染色法在这四种染色方法当中是较好的.在实验教学和科学观察中,实验者可以根据不同的目的选择不同的染色方法.     

促生菌对大蒜根尖细胞有丝分裂的影响

用不同促生菌（U4,CC9）、促生菌加不同浓度NaCl溶液处理大蒜根尖,并在处理的当天和第2、4、6、8和10天通过常规染色压片技术对大蒜根尖细胞有丝分裂进行观察。结果显示：经过促生菌处理的大蒜根尖细胞有丝分裂指数随时间的延长呈现出明显的升高趋势;用NaCl溶液处理的大蒜根尖细胞有丝分裂指数则有明显的下降趋势,并且诱发产生了染色体桥、染色体粘连、核出芽、不均等分裂、微核等畸变现象;用NaCl和促生菌共同处理大蒜根尖细胞时,随时间的延长有丝分裂指数缓慢升高。提示：促生菌在盐渍化土壤中仍对大蒜根尖细胞有丝分裂具有一定的促进作用,而且时间越长促进效果越明显。     

猴头菌染色体数目的研究

本文采用苏木精染色法,自猴头菌子实体剌长0.1cm 开始,至刺长1.0cm 止,每增长0.1cm 对同一子实体夹取菌刺进行染色观察,经过对减数分裂粗线期、双线期、终变期及中期染色体条数的反复观察,认为猴头菌具有12条染色体,即 n=12.     

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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