薄荷愈伤组织诱导与分化研究

本文研究了薄荷愈伤组织诱导与分化的影响因素。以薄荷茎段为外植体,研究培养基、激素水平对愈伤组织诱导、增殖培养的影响;以叶片为外植体,探讨叶片的愈伤组织诱导;以茎段、叶片和叶柄为外植体材料,比较不同外植体的愈伤组织诱导率。实验结果表明:MS比1/2 MS、B5培养基更适于茎段的诱导培养,诱导率达80%;叶片愈伤组织的诱导率为100%,以MS+1.0 mg/L BA+0.1 mg/L KT+0.5 mg/L NAA为最佳诱导培养基;幼叶是不同外植体中诱导效果最好的,以MS+0.5 mg/L BA+0.1 mg/L NAA为最佳诱导培养基。     

四季秋海棠的离体培养及植株再生

以四季秋海棠的叶片为外植体，对其进行了离体快繁的研究．结果表明：附加BA 1mg／L和NAA 0．1mg／L的MS培养基可诱导叶片外植体产生大量不定芽与愈伤组织，而诱导生根的最佳培养基是1／2MS IBA0．5mg／L．试管苗经过炼苗移栽，成活率较高。     

非洲菊组培快繁技术

以非洲菊幼嫩花托为外植体,采用MS作为基本培养基,添加不同生长激素对其进行组织培养研究。结果表明：非洲菊幼小花托MS＋BA3.0mg/L＋NAA0.2mg/L培养基上能很好地诱导形成愈伤组织并分化出不定芽,诱导率50%;继代培养基为：MS＋BA0.5mg/L＋NAA0.2mg/L,增殖系数2.8;生根培基为1/2MS＋NAA0.5mg/L,生根率可达90%。     

攀枝花苏铁愈伤组织的诱导与褐变抑制研究

以攀枝花苏铁的羽叶作为外植体,在含有不同激素的培养基上诱导愈伤组织. 结果表明：以MS+ 2,4-D 0. 2 mg/L+BA1 mg/L为最适宜培养基;2,4-D有利于诱导率的提高;细胞分裂素/生长素的比值高有利于愈伤组织的诱导. BA+KT的双因子组合没有单因子的诱导效果显著;采用0.1%HgCl2消毒的外植体灭菌效果最佳;0.1%的活性炭抑制褐变效果最好.     

蒙古黄芪的组织培养研究

对蒙古黄芪无菌苗的不同外植体(叶片、子叶、下胚轴)进行组织培养研究.结果表明:该三种外植体分别在MS BA2.0mg/L NAA2.0mg/L、LS BA2.0mg/L NAA0.1mg/L、MS BA2.0mg/L NAA2.0mg/L 培养基上的愈伤组织诱导率很高;在这三种外植体中,子叶和下胚轴所诱导的愈伤组织在继代培养基上能分化出芽;试管苗在1/2MS NAA5.0mg/L培养基上生根效果好.     

蒲苇愈伤组织的诱导和再生体系的建立

以蒲苇成熟种子为外植体,MS为基本培养基并附加不同激素组合,筛选出诱导蒲苇愈伤组织产生和分化的最佳培养基,成功建立蒲苇的再生体系．试验结果表明：蒲苇种子最佳灭菌方式是将种子灭菌前用无菌水浸泡24h左右,然后用75％酒精消毒20s,再用0．1％（W／V）氯化汞消毒灭菌10min．愈伤组织诱导的最佳培养基为MS＋2,4-D3．0mg/L＋6-BA0．1mg／L;愈伤组织分化的最佳培养基为MS＋6-BA 2．0mg／L＋NAA 0．1mg/L分化继代的最佳培养基为MS＋6-BA 1．5mg／L＋NAA 0．2mg/L;生根最佳培养基配方为1／2MS＋NAA 0．8mg/L＋6-BA 0．2mg／L＋（0．02％）AC．     

竹节秋海棠离体快繁技术研究

以竹节秋海棠的幼嫩叶作外植体进行了组织培养 .结果表明：（ 1）在不同激素组合的培养基上均能诱导产生丛生芽,在 MS＋ BA2mg/L＋ 2.4－ D0.2mg/L中分化率高,芽质优;（ 2） MS＋ BA0.5mg/L＋ NAA0.2mg/L和 MS＋ BA0.5mg/L＋ 2.4－ D0.05mg/L培养基中有效苗获得率高,长势好;（ 3）再生植株在 1/2MS＋ IBA0.2mg/L＋ NAA0.2mg/L培养基中的生根率达 96％ .     

多因子正交试验对长春花离体培养条件的筛选

应用正交设计法考察了植物生长物质、蔗糖对长春花愈伤组织诱导、丛生芽诱导和生根培养的影响。最佳愈伤组织诱导培养基为MS＋2，4－D0.8mg/L NAA 1mg/L ZT 0.2mg/L。丛生芽诱导最佳培养基为MS＋6－BA0.2mg L NAA 0.3mg/L＋蔗糖30g/L，最佳生根培养基为1／2MS＋NAA 0.2mg/L IBA 0.2mg/L 蔗糖30mg/L。     

影响红掌品种＂若比诺＂愈伤组织诱导因素分析

以红掌品种“若比诺”的无菌苗为材料,研究了影响红掌品种“若比诺”愈伤组织的诱导因素．结果表明,基本培养基、外源激素、外植体类型和光照培养条件对愈伤组织的诱导都有显著影响．茎段在MS＋BA（2．0mg／L）＋2,4．D（0．2mg／L）培养基中愈伤组织诱导率最高,达到100％,叶片在1／2MS＋BA（2．0mg／L）＋2,4-D（0．2mg/L）培养基中诱导率最低（为0）．不同外植体的愈伤组织诱导率有明显的差异,其诱导率的大小依次为茎段〉叶柄〉叶片,茎段最适合做外植体源．光培养下的愈伤组织诱导率比暗培养下的高,光照有利于“若比诺”的愈伤组织的诱导．     

睡菜外植体愈伤组织诱导与培养初步研究

利用睡菜带芽的嫩茎段作为外植体,切成0.5 cm长的片段,通过MS培养基和激素配比实验,筛选出了睡菜茎段愈伤组织诱导的最佳培养基配方.实验结果表明：适宜的消毒时间75%酒精30 s,升汞9 min;适宜的初代培养基为MS＋BA 1.0 mg.L^-1＋NAA 0.10 mg.L^-1;适宜的继代培养基为MS＋BA 0.5 mg.L^-1＋NAA 0.05 mg.L^-1;在培养基中添加1.5 g/L的多菌灵粉剂可以有效抑制真菌生长,诱导出愈伤组织后应在30 d内及时进行继代培养.     

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     

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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