我国关税减让下的政策建议

经过艰苦谈判 ,我国正式成为了WTO的一员。按照WTO的要求 ,我国将进行一系列贸易和投资自由化的改革 ,削减关税是其中的一项重要义务 ,关税的削减必将对我国的经济与社会产生深远的影响。因此 ,提出关税减让背景下的若干政策建议 ,具有非常重要的现实意

Changes of nuclear matrix proteins following differentiation of human osteosarcoma MG-63 cells

本论文在鉴定HMBA诱导人成骨肉瘤MG－63细胞终末分化的结果基础上，应用亚细胞蛋白质组学分析技术，对核基质蛋白在MG－63细胞诱导分化过程中的变化进行系统研究。分析鉴定与肿瘤细胞增殖分化相关的特异核基质蛋白，并探索它们在肿瘤细胞诱导分化过程中的调控作用，以期能够在较为整体水平上进一步认识细胞癌变与逆转机理问题，从而找出细胞增殖与分化调控研究的新方向。实验结果显示，5mmol/LHMBA有效抑制了人成骨肉瘤MG-63细胞的增殖活动，改变细胞形态和超微结构恶性表型特征，并促使MG－63细胞表达骨钙素、骨粘素等成骨特异标志蛋白，选择性抽提整装光镜和电镜观察显示经HMBA处理的MG-63细胞产生了核...In this study, a polar compound, hexamethylene biacetamide, was usedto induce the human osteosarcoma MG－63 cells into terminal differention,and its effects were investigated by cellular biology and immune biology.The differentially expressed nuclear matrix proteins were analyzed bysubcellular proteomic methods in order to find out a new way to explore themolecular machnisms of carcinogenesis and m...学位：理学博士院系专业：生命科学学院生物学系_细胞生物学学号：B20022601

我国关税减让对进口的影响及应对措施

我国加入WTO初期,关税减让及非关税措施的逐步取消对国内产业产生了或大或小的冲击,而在未来几年内尤其是过渡期结束后这种冲击可能更大。在我国已经做出减让关税和取消非关税措施承诺的背景下,要减缓进口产品对国内市场的冲击只能求助于一些其他的符合WTO规则的措施

A New Research into Pragmatic Information in Learner’s Dictionaries

语用学是一门相对比较新的语言学分支，在最近的几十年得到了快速的发展。越来越多的国内外词典学家都开始关注语用学在交际中的重要作用，并把它用于词典编纂。在这方面，以《朗文当代英语词典》，《牛津高阶英语学习词典》等为代表的英语单语学习词典应该成为英汉学习词典和汉英学习词典的典范，它们在体现语用信息方面做得更加出色，采用的手段也比较多。它们使用大量的标签、语用说明、错误警示等来引导学习者正确使用语言并且避免可能出现的失误。释义和例句里也含有一定数量的语用信息。参见系统把读者从一个词条引向另外一个词条的用法说明或者错误警示，使得整个词典的微观结构形成网络，并且与宏观结构发生关联。 但是，汉英学习词...As a relatively new branch, pragmatics has been developed at a fast speed in recent years. More and more lexicographers both at home and abroad have began to pay attention to the important role of pragmatics in communication, and tried to incorporate them into dictionary making. In this regard, some monolingual English learner’s dictionaries have set an example as they do well in providing pragmat...学位：文学硕士院系专业：外文学院英语语言文学系_英语语言文学学号：2005130026

The Construction of a Vector for Endosperm-specific Expression of IPT Gene and It's Transformation in Rice

为研究细胞分裂素在水稻籽粒发育中的作用,构建了P1300-P Pg-5α-IPT-nOS植物表达载体,并对水稻进行遗传转化。以水稻品种9311为材料,采用PCr法获得种子中特异表达的Pg-5α基因启动子,并将此启动子与P1300相连接,构建P1300-P Pg-5α载体,用nCOⅠ和SPEⅠ双酶切P Sg516,获得IPT-nOS核酸片段,然后将此核酸片段插入到P1300-P Pg-5α中,构建P1300-P Pg-5α-IPT-nOS植物表达载体。以水稻品种日本晴愈伤组织为材料,采用农杆菌介导的方法进行遗传转化。成功构建了植物表达载体P1300-P Pg-5α-IPT-nOS,获得了阳性率为81.3%转IPT基因群体。获得转基因株系后,将为进一步筛选高效表达株系及观察其籽粒生长发育过程提供基础。In order to specifically express IPT gene in the endosperm of developing rice seed,the binary vector p1300-p PG-5α-IPT-Nos was constructed,firstly,the promoter of PG-5α was obtained by PCR amplification from rice genomic DNA( variety: 9311) and p1300-p PG-5α was constructed by inserting p PG-5α into p1300,then the IPT-Nos fragment was obtained by cutting p SG516 with Nco Ⅰ and Spe Ⅰ.After IPT-Nos inserted into p1300-p PG-5α,p1300-p PG-5α-IPT-Nos was constructed.p PG-5α-IPT-Nos was transformated into Oryza sativa( subsp.japonicacv.Nipponbare) cells by agrobacterium mediated method and regenerative seedlings were obtained.The results of PCR showed that about 81.3% seedlings were positive.唐山师范学院博士基金项目(09A01); 农业部“948”项目(2011-G1(3)-07); 河北省科技计划项目(13396401D

FEC基电解液对高压正极材料Li2CoPO4F电化学性能的影响

本文研究了以氟代碳酸乙烯酯FEC（fluoroethylene carbonate）为共溶剂的电解液对高压正极材料Li2CoPO4F电化学性能的影响,与碳酸酯基电解液1 mol·L-1LiPF6EC/DMC=1:1（m:m）相比,1 mol·L-1LiPF6FEC/DMC=1:1（m:m）可显著提高Li2CoPO4F的循环稳定性.通过线性扫描伏安法（LSV）、扫描电镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）结合电化学阻抗（EIS）对FEC改善Li2CoPO4F材料循环稳定性的机理进行了探索,结果表明与传统碳酸酯基电解液相比,FEC基电解液在高压下有着优异的抗氧化性,能够有效抑制电解液的氧化分解.同时,FEC基电解液中形成的表面膜具有更高的稳定性,能够抑制电极/电解液界面副反应的发生,提高循环过程中电极材料结构稳定性,从而有益于提高Li2CoPO4F材料的电化学性能.福建省自然科学基金项目(No.2014J05019);;国家自然科学基金项目(No.21233004,No.21303147);;厦门大学校长基金(No.20720150090)资

Progresses of plants response to cadmium

总结了近年来植物对一重要环境污染物镉的反应研究报道。探讨了镉对植物的各种毒性效应 ,并论述植物对镉胁迫采取的相应防御机制 ,如络合 ( PC、MT)、应激 (应激乙烯、应激蛋白 ) ,及额外防御机制 ,如细胞壁固定化、原生质膜排除、区域化、过氧化物酶等 【英文摘要】 The paper summarizes progresses in the field of plants response to cadmium(Cd), an important and widespread heavy metal in enviroment.We analyse the toxic effects of Cd on plants and discuss the response mechanisms of plants to Cd stress including exclusion, immobilization and compartmentalization of the ions, synthesis of phytochelatins and metallothionein, inducements of stess protein and stess ethylene. The higher plants are able to uptake Cd depending on concentration and bioavailability of Cd in the ...国家自然科学基金资助项目 ( 3980 0 0 87;39870 6 30

Progress in Plant Resistance Induced by Salicylic Acid

水杨酸是一种重要的内源信号分子 ,能够激活一系列植物抗性防卫反应 .为了研究这种抗性反应 ,对水杨酸诱导植物抗病性、抗旱性、抗盐性及与乙烯作用的新进展作了概述 ,并从水杨酸与过氧化氢及其代谢酶类相互作用的角度探讨了水杨酸诱导植物抗性生理的分子机理 【英文摘要】 Salicylic acid is an important endogenous signal molecule. It can activate several plant defense responses. New progresses in plant disease resistance, drought resistance, salt resistance and the interaction of salicylic acid with ethylene, and the molecular mechanisms of salicylic acid inducing plant resistance have been established at the interaction of salicylic acid with hydrogen peroxide and its metabolizing enzymes

Preliminary exploration of the experiments teaching reform on water quality monitoring and evaluation course for preventive medicine majors

水质监测与评价是预防医学专业实验教学的重要组成部分,熟悉并掌握水质监测与评价的方法与流程,对于本专业学生毕业后从事疾病预防控制、卫生监督等工作具有举足轻重的作用。针对目前国内水质监测与评价实验教学中存在的问题,通过增加现场教学环节、拓展实验教学内容以及强化实验教学管理与分析质量控制等改革措施,将实验教学与校园环境监测紧密结合起来,以激发学生学习的积极性和主动性,培养学生独立思考问题、分析问题和解决问题的能力,进而为全面提高实验教学质量进行了有益的探索与尝试。Water quality monitoring and evaluation is an important part of experimental teaching for preventive medicine majors.Familiarizing with and mastering the methods and procedures of water quality monitoring and evaluation is crucial for students engaging in disease prevention and control or health supervision after graduation.Aiming at solving the existing problems in experimental teaching of water quality monitoring and evaluation, a series of reformative measures, including increasing the frequency of field experimental teaching, expanding the contents of experimental teaching, strengthening the management of experimental teaching, and analyzing quality control, were implemented; and experiment teaching was combined with monitoring of the campus environment.These measures aimed to stimulate students' initiative to learn, cultivate students' independent thinking and problem analyzing and solving skills, and therefore provide useful exploration and trials in comprehensively improving the quality of experimental teaching