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问题是科学研究的起点,选题是科学研究全过程的第一步。在科学研究过程中,能否敏锐地从科学发展的各种问题中提出有创见性的问题,并从提出的各种问题中形成和选择有价值的研究课题,是科学研究工作能否顺利开展并获得成效的关键。山西省农科院高寒区作物研究所,运用科学的科研选题方法,进行六倍体皮、裸燕麦种间杂交的成功实例,充分说明选题在科学研究工作中的重要作用。 相似文献
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Cancer is a genetic disorder.Although heredi-tary cancers account for only a small fraction of all tumors,most cancers are caused by a variable mix of heredity and environment that leads to accumulations of genetic alterations and then uncontrolled cell pro-liferations(Kops et al.,2005).In addition,genetic alteration is one of the a few most important bio-logical factors that determine the diagnosis and prognosis of different cancers and dictate the treat-ment strategies for cancer patients.Fu… 相似文献
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金标银染基因检测方法中杂交信号的提高 总被引：1，自引：0，他引：1
研究了金标银染基因检测方法中的影响因素以及提高DNA杂交信号的途径. 在"三明治"杂交系统中, 着重研究了氨基DNA探针和纳米金标记巯基DNA探针对杂交的影响. 随着氨基探针浓度的增加, 杂交信号增加, 探针达到一定浓度后信号不再增加, 形成一个平台, 说明连接于玻片表面的探针已达到饱和. 由于纳米金颗粒空间位阻效应的影响大于纳米颗粒表面积的影响, 标记的纳米金颗粒越大, 杂交信号越弱. 而随着金标巯基DNA探针浓度的增加, 杂交效率显著增加, 导致杂交信号提高. 优化后的杂交条件为: 氨基DNA探针浓度为125 μmol/L, 纳米金粒径为15 nm, DNA标记后的纳米金颗粒浓度为4. 07 nmol/L. 通过上述杂交条件优化, 可提高杂交银染的信号. 相似文献
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将萤火虫萤光素酶基因重组到质粒pBR325中,通过“三亲交配”和同源重组,将萤光素酶基因整合到Ti质粒pGV3850:1103。通过改良的叶盘转化法,用萤光素酶基因转化单子叶植物花叶芋,获得转基因植株。对再生植株的胭脂碱测定、新霉素磷酸转移酶分析、DNA点杂交、萤光素酶基因活性测定,证明萤光素酶基因已转化到花叶芋中并进行了表达。 相似文献
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用成年雄性Wistar大鼠,经4％多聚甲醛灌注固定,取下丘脑组织,行再固定24h,常规石蜡包埋和切片,用地高辛标记的cRNA探针进行原位杂交,结果显示在弓状核及其邻近区域见到阳性神经元,阳性信号为蓝色颗粒,胞质、核膜及核仁呈阳性。阴性对照均无阳性反应出现。本实验证实,用石蜡切片进行原位杂交组织化学研究,能检测下丘脑生长抑素神经元基因表达产物mRNA,方法稳定,重复性好,便于普通实验室开展工作。 相似文献
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本文讨论不对称体细胞杂交技术的建立及其在作物育种中的应用前景． 相似文献
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Amanda Gutierrez 《Critical Studies in Education》2016,57(3):313-329
Teacher training for developing nation contexts is often conducted in short, intensive inside and outside-of-country programmes. Concerns have been raised in relation to the uncritical take-up of the western-centric material provided by these programmes, which are usually funded by national and international government organizations. This paper explores an approach used in an outside-of-country teacher training programme funded by an Australian government grant. The research focused on teacher trainers from the Monastic education system and their reflections on whether critical literacy approaches could be incorporated into curriculum in Myanmar. It used a Bakhtinian framework to analyse the teacher trainers’ ideological environments and their hybridizations of critical literacy discourses for their own contexts. It was found that while the teacher trainers were passionate about the worth of developing critical literacy skills for their teachers and pupils, they struggled with a range of constraints that existed for them within their country. The research illustrated the importance of providing spaces for participants in programmes such as these to critically reflect on the relevance of non-government organization (NGO) and international non-government organization (INGO) training programmes, especially in light of the multiple challenges that are a part of their everyday lives. 相似文献
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目的: 探讨人乳头状瘤病毒(HPV)感染及其特定类型与宫颈上皮内肿瘤形成(CIN)和宫颈鳞癌之间的关系.方法: 应用原位杂交方法对我院收治的73例CIN和宫颈鳞癌妇女的宫颈活检组织进行HPV分型检测.其中包括CINⅠ8例,CINⅡ13例,CINⅢ31例,浸润性鳞癌21例.以HPV6/11、16/18、31/33/35三组特异性DNA探针检测在各组宫颈病变中HPV的感染率.结果:1.HPV 6/11只见于CINⅠ和CINⅡ,而HPV16/18是感染CIN Ⅲ和浸润癌中主要类型.2.HPV DNA原位杂交可见点状杂交信号的病例百分数随着病变的进展而显著提高(P<0.01).结论:HPV16/18与CIN Ⅲ和浸润癌发生有关;HPV DNA原位杂交阳性信号的形态提示HPV DNA与宿主细胞整合是致癌的重要途径. 相似文献