獐毛愈伤组织耐盐性研究及耐盐变异体的筛选

獐毛 (Aeluropuslittoralisvar.sinensis)匍匐茎茎尖来源的原始型愈伤组织 ,测定其耐盐范围为 0 .3 %～ 1 .5% .盐胁迫下 ,脯氨酸及K 、Na 、Ca2 离子在渗透调节中起重要作用 .用直接筛选的方法 ,将原始型愈伤组织放在含 2 %NaCl的选择培养基上连续筛选 ,获得耐盐性进一步提高的愈伤组织耐盐变异体 ,在选择培养基上 ,变异型愈伤组织鲜重相对生长率显著大于原始型愈伤组织 ,在变异型愈伤组织耐盐性提高中 ,脯氨酸及无机离子K 、Na 、Ca2 起重要作用 .耐 2 %NaCl的变异型愈伤组织在无NaCl培养基中培养 1 1代后 ,仍能耐受 2 %NaCl,愈伤组织的耐盐性没有退化 ,说明筛选得到的耐盐变异体不是生理适应性的而是由遗传变异而来的 .     

木槿（Hibiscus syriacusL.）耐盐变异体的选择

木槿愈伤组织耐盐细胞系是在含ＮａＣｌ的培养基上通过屡代选择产生的，在无盐培养其中进行几代继代培养后的愈伤组织，由其分化的芽以及脱分化增殖的愈伤组织均表现了耐盐性，木槿耐盐细胞由于对ＮａＣｌ的反应比未经选择的细胞积累了更多的Ｎ＾＋，Ｋ＾＋，而且细胞体积较小。     

甘草根愈伤组织诱导与可溶性蛋白含量变化

利用胀果甘草无菌苗根作为外植体诱导愈伤组织,经过多次继代培养筛选出4种类型的愈伤组织,并以不同质量浓度的NaCl胁迫处理Ⅰ型愈伤组织.测定了在根愈伤组织诱导过程中,不同类型愈伤组织继代培养中和Ⅰ型愈伤组织在NaCl胁迫处理条件下的生长情况及可溶性蛋白含量的变化情况.结果显示,以苗龄10d的无菌苗根为外植体可以诱导产生愈伤组织,以MS培养基附加1.0mg/L 2,4-D和0.2mg/L6-BA时,根愈伤组织的诱导率最高,继代培养生长状况良好为Ⅰ型愈伤组织;根外植体两端开始形成愈伤组织时可溶性蛋白含量最高,为2.01mg/g;不同培养基上继代培养的根愈伤组织生长状态不同,可溶性蛋白含量也有不同,以Ⅰ型愈伤组织中可溶性蛋白含量最高;Ⅰ型愈伤组织在5g/L NaCl胁迫下,继代培养21d后,愈伤组织生长量明显提升,在14~21d愈伤组织可溶性蛋白含量明显提高.本研究表明甘草愈伤组织对低质量浓度的盐胁迫有一定的适应性,使其可溶性蛋白含量升高,在可溶性蛋白含量剧烈变化期间,愈伤组织生长量明显提高.     

向日葵耐盐突变体筛选

以MS为基本培养基,研究了不同激素对康地5号向日葵愈伤组织的诱导效果,筛选出了最佳诱导愈伤组织培养基;以子叶、下胚轴及真叶作为外植体。确定了子叶和下胚轴作为康地5号组织培养的最佳外植体;在含50、100、及150mmol／L NaCl不同盐浓度培养基上分别诱导出向日葵耐盐愈伤组织,继代培养后得到不同耐盐程度的新株系,移栽后得到完整植株．     

高蛋白籼稻品系H28胚培养力的初步研究

以籼稻Ｈ２８优良品系为材料，通过胚培养诱发愈伤组织并继代培养，最适的诱导培养基为ＭＳ＋２ｍｇ／Ｌ ２，４－Ｄ，在此培养基上产生的愈伤组织具有较强的分化能力，将愈伤组织转移到分化培养基，光照培养１７ｄ后，在ＭＳ＋０．２５ｍｇ／Ｌ ＮＡＡ＋１ｍｇ／Ｌ ＢＡ的分化培养基上，愈伤组织的芽分化率可达４０％。在分化培养基上培养１０ｄ后，将愈伤组织转移到无激素或低浓度激素的培养基上，其分化出苗率有明显的提高。     

紫花苜蓿耐盐突变体筛选

以MS为基本培养基,研究不同激素对紫花苜蓿2号愈伤组织的诱导效果,筛选出最佳诱导愈伤组织培养基;以茎尖、茎段及叶片作为外植体,确定了叶片作为紫花苜蓿组织培养的最佳外植体;在1/4、1/3及2/3 3种不同海水培养基上分别诱导出紫花苜蓿耐盐愈伤组织,继代培养后得到不同耐盐程度的新株系,移栽后得到完整植株.     

甘薯愈伤组织的诱导、生长调节及原生质体培养

甘薯叶片培养在附加NAA0.01-1.0/ZT0.01-10mg/L的MS培养基上可以100％地诱导产生愈伤组织,NAA1.0/ZT0-0.1mg/L可诱导叶片产生根。经HPLC测定,甘薯叶片内源生长素含量为480ng/g·FW,可能与甘薯叶片易诱导生根有关。在MS培养基上诱导产生的甘薯愈伤组织质地致密、生长缓慢,当继代于高NO_3~-低NH_4~+含量的改良MS培养基上就可转变为疏松、生长迅速的愈伤组织。用疏松愈伤组织酶解出了大量原生质体,并培养再生成了愈伤组织块。     

簇毛麦（Haynaldia Villosa）的原生质体培养

簇毛麦的幼胚在含有９μｍｏｌ／Ｌ２，４－Ｄ的ＭＢ固体培养基上诱导产生愈伤组织，在相同的培养基上继代培养两个月后出现淡黄色的致密瘤状愈伤组织．在继代培养过程中，愈伤组织的分化能力丧失较快．继代培养一年左右，改变培养条件，可得到颗粒状及粉粒状愈伤组织．分别用这两种类型的愈伤组织建立悬浮培养细胞系．愈伤组织的形态结构与悬浮系的建立及原生质体培养密切相关．来源于颗粒悬浮系的细胞团块产生的原生质体分裂后可产生体细胞胚，而用粉粒悬浮系分离的原生质体不能持续分裂．     

甘蔗愈伤组织耐盐性研究:耐盐愈伤组织的筛选及脯氨酸、还原糖含量变化

在附加不同浓度NaCl及2.4-D2mg/L的MS培养基上,甘蔗愈伤组织表现出不同的生长效应。培养基中NaCl浓度低时(1％以下),甘蔗愈伤组织表现为适应性生长;而在高NaCl浓度时(2％以上),愈伤组织生长表现出盐害特征。脯氨酸、还原糖测定结果显示,在盐适应情况下,甘蔗愈伤组织中的脯氨酸含量较高,还原糖含量较低;在盐害情况下则相反。     

甘蔗愈伤组织耐盐性研究:耐盐愈伤组织的筛选及脯氨酸、还原糖含量变化

在附加不同浓度NaCl及2.4-D 2mg/L的MS培养基上,甘蔗愈伤组织表现出不同的生长效应。培养基中NaCl浓度低时(1%以下),甘蔗愈伤组织表现为适应性生长;而在高NaCl浓度时(2%以上),愈伤组织生长表现出盐害特征。脯氨酸、还原糖测定结果显示,在盐适应情况下,甘蔗愈伤组织中的脯氨酸含量较高,还原糖含量较低;在盐害情况下则相反。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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