三叶半夏细胞悬浮培养和植株再生的研究

三叶半夏幼嫩叶片在MS+2,4-D2.0mg/L+BA0.5mg/L培养基上一个月内可以诱导出愈伤组织.取颜色鲜黄的愈伤组织进行悬浮振荡培养,经3～4次继代培养得到分散性好的细胞悬浮系.悬浮培养过程中细胞生长曲线呈S型,培养12～16d达对数生长期,细胞鲜重在第18d达到最大值.悬浮液pH值的变化在对数生长期同生长曲线一致.将细胞悬浮液过滤得到的小细胞团接种于MS+NAA0.2mg/L+BA1.0mg/L分化培养基上,40d分化出小植株.     

前胡组织培养和细胞悬浮培养中胚状体发生及植株再生

前胡的种子幼苗切段在含有1mg/l2,4-D的(1/2)MS 固体培养基(大量元素减半)上,诱导产生愈伤组织。诱导两个半月的愈伤组织,在含有1mg/l6-BA+0.5mg/lIBA 或无激素的(1/2)MS 固体培养基上,分化出胚状体,再生成完整植株。愈伤组织在液体培养基中振荡分散及过滤制备成悬浮培养物,在含1mg/l2,4-D的液体培养基中,胚性细胞不断增殖。转移至含有0.05mg/l 2,4-D+0.05mg/l 6-BA 的(1/2)MS 液体培养基中,分化出胚状体,发育成完整植株。     

巴东红三叶愈伤组织的诱导和胚性细胞悬浮系的建立

以红三叶（Trifoliumpratense）野生品种巴东红三叶的叶片为外植体，在MB－1至MB－9的固体培养基上诱导愈伤组织，筛选出最佳培养基是MB－9培养基．愈伤组织形成以后，均经MB－9固体培养基上继代培养3～4次后，获得胚性愈伤组织，然后转至MB＋3mg／1.2，4－D＋0．7mg／LBA＋0．2mg／LNAA＋2mg／L甘氨酸十500mg／LCH＋3％蔗糖的液体培养基中，经强化培养两个月后，获得胚性细胞悬浮系．实验结果表明，缩短换液时间，即每隔3～4d换液一次，可加快胚性细胞悬浮系的建立．     

具高分化潜能的枸杞胚性悬浮细胞系的建立及保存

本文主要报道了具有高度植株再生潜能的枸杞优质胚性悬浮系的建立与保存方法．首次应用枸杞髓部组织诱导出Ⅱ型胚性愈伤组织，Ⅱ型胚性愈伤组织在ＭＳ液体培养基中增殖快（３天即可加倍），分散好，两周左右即可建立起优质悬浮系；悬浮细胞在液体分化培养基中能得到大量的胚状体，未经过滤建立起的悬浮系比经过过滤建立起的悬浮系能得到更多的胚状体．长时间悬浮培养后，枸杞胚性悬浮系再生能力下降，在固体培养基上培养一段时间后，转回液体培养基可使再生能力得以保持与恢复     

曲阜香稻胚性愈伤组织培养及悬浮细胞系的建立

水稻 (OryzasativaL .)曲阜香系 10 3成熟胚在MS1培养基上诱导培养 ,初始愈伤组织为深黄色、瘤状 ,非松脆类型 .当在MS2 培养基上继代培养 ,经 3～ 4月初始愈伤组织转变为浅黄色、小颗粒状 ,松脆型胚性愈伤组织 .将胚性愈伤组织置于液体培养基中悬浮培养 ,经 4月多可得分散性好、生长快的胚性悬浮细胞系 .     

水稻佳辐占成熟种胚培养及其悬浮细胞系的建立

以优质早籼稻佳辐占成熟种胚为材料．研究外植体大小、激素对成熟种胚愈伤组织诱导率的影响，并高频快速建立起水稻胚性悬浮系．结果表明：在外植体较大并只添加2，4-D-种激素时，就可获得较高的愈伤组织诱导率，2，4-D浓度为1．5mg／L时，诱导率达95％；浓度为2mg／L时．诱导率可达100％．佳辐占成熟种胚组织培养最佳的条件为适当大小的外植体和添加浓度为2mg／L2，4-D．以4周龄的胚性愈伤组织为材料可高频快速建立起均质、分散性好的水稻胚性悬浮系，5周龄以上的胚性愈伤组织较难建立起水稻胚性悬浮系．     

茴香原生质体培养研究

以茴香（ＦｏｅｎｉｃｕｌｕｍｖｕｌｇａｒｅＬ．）幼苗茎切段在ＭＳ附近２，４－Ｄ１ｍｇ／Ｌ、６－ＢＡ０．５ｍｇ／Ｌ的培养基上诱导产生愈伤组织，经４～５次继代后形成胚性愈伤组织。将胚性愈伤组织转至ＭＳ＋ＮＡＡ１ｍｇ／Ｌ＋２，４－Ｄ０．５ｍｇ／Ｌ＋６－ＢＡ０．２５ｍｇ／Ｌ的液体培养基中培养，形成胚性细胞悬浮系。悬浮细胞在含有１．５％纤维素酶、１％果胶酶、０．５％蜗牛酶的混合酶液中酶解得到大量的原生质体，原生质体用修改的ＫＭ８Ｐ培养基中做液体浅层培养。２天后细胞发生一裂，两个月后形成０．５～１ｍｍ大小的小愈伤组织，转入含琼脂糖的固体培养基中３周后形成２～３ｍｍ的愈伤组织     

外源激素对防风体细胞胚发生和发育的影响

目的探讨生长素和细胞分裂素对防风体细胞胚发生和发育过程的影响。方法组织培养和石蜡切片。结果0．5mg／L2，4-D是诱导胚性愈伤组织最适宜的生长素浓度，0．5mg／LNAA在胚性愈伤组织的长期继代培养中替代0．5mg／L2，4-D可减少畸形胚的发生，NAA浓度降至0．2mg／L时促进体细胞胚的发生和分化；生长素加一定比例的细胞分裂素(6-BA或KT)可有效促进体细胞胚的发生；通过逐步降低生长素和细胞分裂素的浓度，可促进体细胞胚的分化和生长；体细胞胚在无附加激素或附加激素浓度分别低于0．2mg／LNAA和0．5mg／L6-BA的MS培养基上，均能发育成完整的植株。结论一定浓度的生长素是诱导防风胚性愈伤组织的关键因素，细胞分裂素在体细胞胚的发生和发育过程中起协同作用。     

杂交粳稻3优18的胚性愈伤组织及胚悬浮细胞培养

杂交粳稻3优18是天津水稻研究所选育的强优粳型杂交新组合，品质好，产量高，但分蘖力不高，不能再留种栽培．杂交粳稻3优18成熟胚在MS1培养基上诱导形成的初始愈伤组织呈深黄色、瘤状，为非松脆型、初始愈伤组织MS2培养基上经3～4个月继代培养，转变为浅黄色、小颗粒状、松脆型胚性愈伤组织．将胚性愈伤组织置于悬浮培养基中培养，经4个多月可得分散性好、生长快的悬浮细胞培养物．     

玉米单细胞培养的研究

将类型Ⅱ愈伤组织从固体培养基转入悬浮培养，发现在改良1/2MN培养基，1.0-2.0mg/L的2,4-D浓度及1000mg/L肌醇存在下，适合所有不同基因型玉米自交系悬浮细胞的生长和细胞成活率的提高.悬浮培养5-6天继代1次是适宜的.大量元素减半和0.5-1.0mg/L的2,4-D浓度用于玉米单细胞培养，能获得良好的细胞分裂和生长.细胞悬浮培养获得了愈伤组织.     

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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