猪笼草瓶中乾坤大——揭开猪笼草捕虫机理的奥秘

在自然界的食物链中,作为生产者的植物几乎总是处于最底层。植物在应对被动物（包括昆虫）取食的过程中可能会作出生理反应,被动地进行反抗,如在生长过程中可能会分泌出苦涩的或有毒的物质,让动物不再取食甚至远离该植物,以保护植物的叶片、花或果实,保证物种的繁衍。同样,昆虫为了生存,也会通过生理的、生化的及其行为的改变加以适应,继续取食该种植物。这样,便出现了植物与昆虫彼此针锋相对而又协同演化的有趣现象。     

神奇的"石油植物"

可再生的“石油植物” 所谓“石油植物”，系指那些可以直接生产工业用“燃料油”，或经发酵加工可生产“燃料油”的植物的总称。例如，现已发现的大量可直接生产燃料油的植物，主要分布在大戟科，如绿玉树、三角戟、续随子等。这些石油植物能生产低分子量氢化合物，加工后可合成汽油或柴油的代用品。     

南京农业大学成功研制"植物专用LED光源系统"

南京农业大学经过10年的研究，在“半导体照明光源在植物组培中的应用研究”这一863课题的支撑下，成功研究出“专用于植物生长的新型LED光源系统”，从而改变了“万物生长靠太阳”的不变规律。[编者按]     

土壤重金属污染的治理途径及其研究进展

由于工业“三废”的排放，使农田遭受不同程度重金属的污染，重金属通过在作物体内富集进入食物链，对人畜健康构成了威胁，章对土壤重金属的污染现状、治理途径及其原理、优缺点、可行性作了简要的回顾，对土壤重金属污染植物修复技术类型、原理、特点以及基因工程等现代生物技术在镉污染植物修复技术中的应用前景作了进一步的展望，为实现对重金属污染土壤进行有效的生态整治与安全高效益的利用提供了新的技术途径。     

探究不同条件对苔藓分泌物酸性的影响

我在老家的房子里发现墙上长了一些绿绿的苔藓，周围的水泥都脱落了。这些苔藓怎么能把墙“咬坏”呢？苔藓是怎样的一种植物？我去请教爸爸。爸爸告诉我：苔藓虽然植株矮小、结构简单，却是一种古老的植物；至于为什么能把墙“咬坏”，可能是其分泌的酸性物质腐蚀了墙体。     

植物染色体中的核糖核蛋白物质

本文用不同进化类型的植物为材料，采用ＢｅｒｎｈａｒｄＲＮＰ优先染色技术，对染色体中的ＲＮＰ物质进行了系统的观察，结果发现，在植物染色体中普遍存在有ＲＮＰ，且分布特点基本相同，除在染色体周边由较多ＲＮＰ构成“鞘状”结构外，在染色体的内部也随机分布有少量的ＲＮＰ，此结果经ＮａＯＨ处理得到了进一步的证实。     

大巴山区大气圈、水圈和生物圈环境研究--大巴山区生态环境研究报告(二)

为保护大巴山区地球生态环境，科学利用这片国土，采用观察和检测的方法，对其进行了研究。对不同地区的大气和水源采样测试分析说明大巴山区大气和水环境质量非常好；森林资源极其丰富，植物带谱明显，森林群落和食物链结构完整；植物没受污染，生物圈环境质量好。     

植物源杀菌剂的研究进展

综述了抗菌植物资源种类、植物中的主要抑菌成分、植物抗菌物质的检测以及植物源杀菌剂的应用开发研究，并提出了在抗菌物质筛选中应注意的一些问题．     

为什么大多数植物害怕严寒？

植物之所以害怕严寒，主要是因为低温会破坏它们的细胞膜。在正常温度下，植物的细胞膜就像智能化的城墙，将有用物质放进细胞，又能将有害物质排出去。但是低温会让这墙“城墙”失效，结果细胞里外乱成一锅粥，正常的生理活动部无法进行了。更要命的是，气温下降会使细胞内的水冻结成冰，这些有棱有角的冰晶，难免会“刺伤”细胞，破坏细胞结构，这样，植物还怎么活？     

"新丰宝"对小麦幼苗细胞保护酶活性的影响

采用“新丰宝”植物生长促进剂 ,对小麦种子进行浸种处理 ,以测定在水分胁迫下对小麦幼苗细胞保护酶活性的影响。实验证明 ,“新丰宝”对提高细胞保护酶活性 ,增强植物抗性有着良好的作用     

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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