共查询到20条相似文献，搜索用时 78 毫秒
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矮牵牛在生产中常采用播种繁殖。但是种子大都是从国外进口的,价格昂贵,为了更快的获得大量种苗,通过对矮牵牛进行了快速繁殖方法的实验．主要采用组织培养技术繁殖．经半年多的研究和配方试验,掌握了矮牵牛的组织培养配方及技术,大大缩短了其繁殖周期．并保持其品种的稳定性． 相似文献
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该文对食用仙人掌组织培养过程中外植体的选择、培养基的选择和外源激素的作用、生根与壮苗培养等方面进行综述,以期为食用仙人掌的组织培养与快速繁殖提供参考. 相似文献
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植物组织培养的应用及存在问题 总被引：6，自引：0，他引：6
本文介绍了植物组织培养技术在快速繁殖、植物育种、人工种子、种质保存及次生代谢物生产等方面的应用及取得的进展,指出植物组织培养中存在的问题并提出了相应的解决方法。 相似文献
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组织培养是荆门野生百合快速繁殖的重要方法。实验证实,该组织培养的最佳外植体是外层鳞片的基部组织,初生诱导芽的适宜培养基为MS BA1.0 mg/L NAA0.1 mg/L,增殖培养基的适宜配方为MS BA0.5 mg/L NAA0.1 mg/L,生根培养基的适宜配方为1/2MS BA0.05 mg/L NAA0.05 mg/L 活性炭3 g/L、2/1MS BA0.05 mg/L NAA0.1 mg/L 活性炭3 g/L,试管苗移栽适宜土壤基质为腐殖土与沙壤土1:1的混合土。同时经与百合种子繁殖、鳞片扦插繁殖相比较,扦插繁殖的单产和总产接近于组织培养繁殖。建议建立组织培养基技术与鳞片扦插技术相结合的规模化生产种植模式,并提供了相应的技术参数体系。 相似文献
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利用植物组织培养的方法可对植物进行快速繁殖,这种快速繁殖技术已广泛用于多种(类)植物的大批量生产,经济效益和社会效益相当可观. 相似文献
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文章试图从快速繁殖 ,胚状体形成 ,离体胚培养 ,高频再生系统建立 ,药用植物组织培养 ,以及染色体检测等六个方面论述一下近年来国内植物组织培养的进展情况。 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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《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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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 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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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
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献