共查询到20条相似文献，搜索用时 390 毫秒
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随着DNA重组技术、基因遗传转化技术及植物组织培养技术的发展，植物基因工程日趋成熟．本文介绍了我国转基因植物研究现状，植物转基因常用的方法，转基因作物的安全性问题． 相似文献
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植物基因工程及其在农业中的应用 总被引：2，自引：0，他引：2
近年来，植物基因工程研究取得飞速发展，在促进农业生产方面发挥了巨大作用．综述了植物基因工程主要研究方法及其目前的应用现状，并对植物基因工程产品的安全性问题作了分析。 相似文献
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转基因植物与植物转基因技术简介 总被引：5，自引：0，他引：5
随着DNA重组技术、基因遗传转化技术及植物组织培养技术的发展,植物基因工程日臻成熟。本文介绍了转基因植物的种类和植物基因转化技术。 相似文献
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郑光宇 《喀什师范学院学报》2002,23(6):49-56
20世纪80年代以来．基因工程技术在农业上的应用取得了斐然成果，植物基因工程已成为农业绿色革命的最重要技术手段，为此对植物基因工程中目的基固的克隆，载体构建的研究进展作了综合评述． 相似文献
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植物遗传转化技术既是研究基因调控等理论问题的技术手段，又是基因工程改良植物，获得某些商品化产品的核心技术。自1983年首次获得转基因植株以来，植物遗传转化在多方面取得了较大的突破，发展十分迅速。技术上不断创新和改良，转基因成功的植物种类已越来越多，批准进行田问试验的转基因植物在全世界已有上千例，基因工程的一些产品不久将进入市场。我国政府对于植物基因工程给了高度重视，“八五”及“863”重大研究资助项目都涉及了重要高等植物的遗传转化研究。我国在这一研究领域也已取得了相当大的成就。 相似文献
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土壤农杆菌在植物基因工程中的应用 总被引：1，自引：0，他引：1
郑光宇 《喀什师范学院学报》2004,25(3):51-54
利用土壤农杆菌转入外源基因是植物基因工程中的有效手段．为此，对土壤农杆菌转化系统中的载体系统、土壤农杆菌转化植物的分子机制以及土壤农杆菌在基因工程中应用的研究进展作了综合评述。 相似文献
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植物基因工程技术对草莓育种工作的思索 总被引：2，自引：0，他引：2
根据植物基因工程的技术原理，在培养抗病毒、耐贮藏、抗除草剂、高甜度、抗真菌草莓新品种方面提出了见解，期望借助植物基因工程技术为草莓育种服务。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献