利用电击法转化玉米胚性愈伤组织获得GUS基因瞬时表达的研究

作者以成单玉米幼胚经诱导、继代、筛选,获得了可分化的胚性愈伤组织,采用电击转化法,将质粒PBI121导入成单玉米的胚性愈伤组织中,通过组织化学染色法,观察到了GUS基因的瞬时表达,并筛选出对愈伤组织损害轻、GUS表达较强的最适电击条件为：960μF,375V/cm,61ms。     

农杆菌介导的中国水仙遗传转化体系的建立

利用根癌农杆菌介导法将GUS基因导入中国水仙,组织化学法检测转化后共培养3d的水仙鳞茎盘组织块,GUS基因瞬时表达很好,90％以上的材料呈现大面积的蓝色斑块,取筛选培养20d的材料检测GUS基因的稳定表达,约1％的组织块有蓝色反应。水仙预培养10d后转化,转化前在菌液中加入60μmol/L AS活化2－3h,转化率提高了两倍以上。转化材料在MS＋BA10＋NAA0．2＋Cef300＋Gyg30培养基上培养20d左右分化出小鳞芽,频率约为60％,组织块平均出芽5．7个,最多可达14个,小鳞芽10d后长成小鳞茎。     

农杆菌介导转化水稻方法的改进

采用培矮64S和9311两种籼稻为材料,研究了影响农杆菌介导转化的几种因素．研究结果表明,预培养4d的幼胚最适宜作为农杆菌介导转化的受体,其次是来源于幼胚和成熟胚的生长状态良好的胚性愈伤组织．以AAM培养基作为共培养培养基,对于农杆菌EHA105（pUblm）来说,菌液浓度为OD600值=0．8时,愈伤组织的转化率最高．在农杆菌侵染愈伤组织过程中,通过负压处理可明显提高愈伤组织的转化频率．在愈伤组织浸染后,以含一定浓度的Ca^2＋和表面活性剂Tween20的溶液处理可明显提高水稻愈伤组织的转化频率．     

葡萄幼胚培养技术的研究(Ⅱ)——接种时间及处理方法对胚培养的影响

选用花后35￣60d的巨峰、里扎马特和无核白葡萄,取其幼胚接种于不同激素水平M S培养基上,进行胚培养,以研究接种时间及处理方法对胚培养的影响.结果表明对花后60d的里扎玛特和巨峰的幼胚进行胚培养,其发芽率和成苗率显著高于层积处理后催芽播种的种子的发芽率与出苗率.低温和横切处理能有效地促进葡萄幼胚的萌发.花后60d的巨峰和里扎马特的发育率和成苗率最高;花后60d的无核白的幼胚发育率最高,花后50d的幼胚成苗率最高.     

秋葵幼胚培养试验初步研究

以秋葵幼胚为试材,筛选较适合幼胚萌发和成苗的培养基,并研究胚龄分别为开花后4 d、6 d、8 d、10 d的幼胚萌发率和成苗率.结果表明,秋葵幼胚萌发和成苗的适宜培养基分别为Qz(Ms+0.1 mg/mL BA+1.0 mg/mL GA3)和QG(Ms+0.5mg/mL GA3);开花后8 d的幼胚萌发率和成苗率最高.由此建立秋葵幼胚培养的方案.     

桂花幼胚离体培养形成丛生苗

分别以不同品种桂花的幼胚为外植体进行组织培养,研究了不同激素条件对离体培养的桂花幼胚存活率、出芽率、幼苗平均株高以及平均丛生芽数等的影响.实验结果表明:籽银桂幼胚在1/2 MS+0.5mg·L-1 TDZ+0.1mg·L-1 NAA培养基上培养,幼胚存活率为100%、萌芽率为50%、幼苗平均株高度为3.9cm,丛生芽数达3个;莲子丹桂幼胚存活率高达100%,其幼苗平均高度为2.2cm;"庐州黄"籽银桂平均丛生芽数多达3个.此研究为桂花的大量离体繁殖提供了新的实验体系.     

小麦耐盐变异体的筛选——Ⅰ.小麦体细胞胚性无性系的建立

利用春小麦11个品种,通过幼穗和幼胚离体培养,研究了基因型,外植体和培养基成分对愈伤组织诱导率和分化率的影响.结果表明,不同基因型的愈伤组织诱导率和分化率差异明显.幼穗长度以10～14mm 时接种为宜,幼胚以开花后11～14d 接种效果最好.诱导培养基的效果以 MB>MS>N_6>LS,2,4-D 以2mg/L 较为合适,不宜加6BA 和 NAA,但加适量甘氨酸和谷氨酰胺有利于愈伤组织的诱导.分化培养基中加少量6BA 和 NAA 是必要的,而且 ZT 的作用优于 KT.通过以上研究,从中筛选出了3个能长期保持较高再生植株潜力的体细胞胚性无性系.     

根癌农杆菌介导的水稻遗传转化

以粳稻、空育131、垦鉴稻7号成熟胚、幼胚诱导的愈伤组织为材料,将反义蜡质基因导入受体材料.经两次抗性筛选后,转入分化培养基中分化培养后获得转基因小苗.成熟胚和幼胚的转化效果比较,幼胚优于成熟胚.将转化植株进行PCR鉴定,证明外源目的基因已经整合到植株中.     

农杆菌介导的小麦遗传转化条件的研究

利用来自小麦花药,幼胚愈伤组织和带有ＧＵＳ基因的Ｔｉ质粒,对农杆菌转化小麦的条件进行了初步研究,证实适当浓度的乙酰丁香酮是诱发Ｔ－ＤＮＡ转移的必要条件,其最低有效浓度为５０μｍｏｌ／Ｌ。     

尾巨桉遗传转化系统建立的研究

以建立的尾巨桉(Eucalyptus urophylla×grandis)3226、3228无性系高频再生体系为基础,利用GUS染色组织分析法研究了预培养时间、侵染时间和共培养时间因素对尾巨桉茎段遗传转化的影响,探讨了适宜尾巨桉转化的卡那霉素与抑菌抗生素使用浓度.结果表明,较优的转化条件是:茎段外植体不需进行预培养而直接进行侵染（菌液浓度OD600值为0.5）3 min,共培养2 d,然后转移到含75 mg／L卡那霉素和300 mg／L头孢噻肟钠的筛选培养基上,进行转化植株的再生.3226、3228     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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