不同温度和激素浓度对春兰部分生理活动的影响

通过改变温度,细胞分裂素6-BA浓度后对春兰的过氧化物酶活性、丙二醛、可溶性蛋白质、可溶性多糖含量变化的测定,研究不同培养条件对春兰生理活动的影响．结果显示：春兰的过氧化物酶活性受温度及细胞分裂素浓度影响的强弱顺序是18℃、30℃、26℃、22℃,8mg／L、2mg／L、4mg/L、6mg/L;丙二醛含量受温度及细胞分裂素浓度影响的强弱顺序是30℃、22℃、18℃、26℃,2mg／L、8mg／L、4mg／L、6mg／L;可溶性蛋白质含量受温度及细胞分裂素浓度影响的强弱顺序是26℃、30℃、22℃、18℃,6mg/L、4mg/L、8mg／L、2mg/L;可溶性多糖含量受温度及细胞分裂素浓度影响的强弱顺序是26℃、22℃、30℃、18℃,6mg／L、4mg/L、8mg／L、2mg／L．由此表明春兰在本实验温度范围内,最适生长温度为26℃,最适细胞分裂素6-BA浓度为6mg／L。     

低温逆境下“鲁赫”刺蔷薇抗性分析

结合低温胁迫过程中生理生化指标的变化,对"鲁赫"刺蔷薇(Rosa acicularis‘Lu He’)一年生实生苗、一年生扦插苗、二年生实生苗、二年生扦插苗进行抗寒性评价。在低温(10℃)处理第0,2,4,6,8 d时对其相对电导率、脯氨酸、丙二醛(MDA)、可溶性蛋白质和可溶性糖含量以及过氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性进行测定,并运用隶属函数法进行综合评价。结果表明,随着低温胁迫时间的延长,4类"鲁赫"刺蔷薇苗木的相对电导率、脯氨酸、丙二醛(MDA)、可溶性蛋白质以及可溶性糖含量总体均呈上升趋势,而POD、CAT活性均先升后降,一年生扦插苗的SOD活性先升后降,其它苗木则是先降后升。对生理指标进行综合分析,得出4类苗木的抗寒性顺序为一年生实生苗二年生扦插苗一年生扦插苗二年生实生苗。     

植物低温保剂对辣椒幼苗抗寒力的影响

应用研制的植物低温保护剂喷施辣椒幼苗，生理生化测定表明，电导率，丙二醛含量比对照降低；ＴＴＣ还原率，脯氨酸含量，可溶性总糖和叶绿素含量比对照提高；超氧化歧化酶，过氧化氢酶，过氧化物酶等保护性酶的酶活性也双对照提高；根和叶ＴＴＣ还原率同步升高，电导率同步降低。     

金线莲种质的生理生化特性及内源激素含量差异

比较两个金线莲Anoectochilus roxburghii (Wall.) Lindl.种质的生理生化特性及内源激素含量差异,为后续的金线莲优良品种选育提供参考依据。本研究以福建小圆叶金线莲和福建黑叶金线莲30 d扩繁丛生苗、30 d生根试管苗和30 d温室移栽苗为材料,采用酶联免疫吸附测定法(ELISA)分别测定两个金线莲种质的内源激素含量;可溶性蛋白、可溶性糖、叶绿素和丙二醛(MDA)含量,以及过氧化物酶(POD)活性采用分光光度法测定。试验结果显示在扩繁、生根、移栽过程中,福建小圆叶金线莲可溶性蛋白含量、可溶性总糖含量、POD活性、MDA含量及其体内脱落酸(ABA)、赤霉素(GA)含量均高于福建黑叶金线莲,且两个不同种质金线莲扩繁、生根苗的可溶性蛋白、可溶性总糖及其体内玉米素(ZR)、GA和生长素(IAA)含量均显著(P0.05)高于移栽苗。因此,福建小圆叶金线莲可能更易于适应环境的变化。     

植物低温保护剂对辣椒幼苗抗寒力的影响

应用研制的植物低温保护剂（ＰＬＴＰＡ）喷施辣椒幼苗．生理生化测定表明，电导率，丙二醛（ＭＤＡ）含量比对照降低；ＴＴＣ还原率，脯氨酸含量，可溶性总糖和叶绿素含量比对照提高；超氧物歧化酶（ＳＯＤ），过氧化氢酶（ＣＡＴ），过氧化物酶（ＰＯＤ）等保护性酶系统的酶活性也比对照提高；根和叶ＴＴＣ还原率同步升高，电导率同步降低     

龙眼抗热性的研究

以晚熟龙眼品种立冬本为材料,研究其在25、35、40C温度下叶片的过氧化物酶(POD)活性、叶绿素a(chla)、叶绿素b(chlb)、丙二醛(MDA)活性和土壤含水量的变化.研究结果表明chla随着温度的上升呈下降趋势,chlb较稳定、因而导致chla/b的下降;35℃处理的土壤失重率最大,叶片丙二醛(MDA)含量高、过氧化物酶(POD)活性最强;40℃处理其次;龙眼在40℃处理条件下出现叶片失绿、反卷等不良反应,龙眼已开始受到高温危害.     

低温胁迫对六个类型黑果枸杞枝条抗寒性的影响

为了筛选抗寒性较高,能适应新疆北疆冬季低温的黑果枸杞类型,以3个野生型及其相应的优选系黑果枸杞枝条为试验材料,在4(对照)、-25、-30、-35和-40℃条件下进行生理指标测定,对各指标间相关性进行分析,采用主成分分析法、隶属函数法对不同类型黑果枸杞枝条抗寒力进行评价。结果表明:6个类型黑果枸杞枝条的相对电导率呈上升趋势;丙二醛含量呈"升-降-升"的变化趋势;超氧化物歧化酶活性先下降后上升,过氧化物酶、过氧化氢酶活性、可溶性蛋白、可溶性糖含量类型间变化趋势不同,脯氨酸含量呈"升-降-升-降"的变化趋势。相关性分析结果表明,丙二醛与相对电导率呈极显著正相关,可溶性糖与相对电导率呈显著负相关。主成分分析和隶属函数法综合评价6个类型黑果枸杞抗寒性从大到小依次为:西宁优系、库尔勒野生、库尔勒优系、武威野生、西宁野生、武威优系。     

百合属几种植物亲缘关系的可溶性蛋白质和过氧化物酶分析

采用聚丙烯酰氨凝胶电泳法，分析了百合属8种植物的可溶性蛋白质和过氧化物酶．结果显示：可溶性蛋白质谱共有48条带，其中26条带为多态性带；过氧化物酶谱共有20条带，19条带具有多态性．根据可溶性蛋白质和过氧化物酶的谱带进行了聚类分析，结果表明，生化水平与传统的形态学分类结果基本一致．     

高温胁迫对珙桐叶片生理生化指标的影响

研究高温胁迫对珙桐叶片生理生化指标的影响. 结果表明：随着胁迫时间的延长,叶绿素和可溶性糖的含量降低;而游离脯氨酸和丙二醛的含量增大;相对电导率增大;超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）的活性在胁迫2h时稍微增大,以后随着胁迫时间的延长其活性降低. 通过以上几项生理指标的测定表明：离体珙桐叶片能耐39 ℃的高温胁迫2~4 h.     

外源水杨酸对菌草抗冷性的影响

在5℃低温胁迫下,用不同浓度水杨酸(0,0.5,1.0,1.5,2.0,2.5,3.0,3.5 mmol/L)处理菌草幼苗,通过测定过氧化物酶(POD)活性、丙二醛(MDA)含量和相对电导率,研究水杨酸对菌草抗冷性的影响,结果表明:在低温胁迫下,水杨酸处理能显著影响菌草的POD活性、MDA和相对电导率,其中,用2 mmol/L水杨酸处理后,过氧化物酶活性增加最显著,与对照相比较有显著差异,用1.0 mmol/L水杨酸处理后,能显著降低菌草的丙二醛含量,用1.5 mmol/L水杨酸处理后,能显著降低菌草的相对电导率。表明在低温胁迫下用1.0 mmol/L至2 mmol/L水杨酸处理能提高菌草的过氧化物酶活性,降低丙二醛和相对电导率,能提高菌草的抗冷能力。     

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