67 resultados para 19-187

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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植生克雷伯氏菌(Klebsiella planticola 19-1)是从新疆鄯善地区玉米根际分离得到的一株联合固氮菌。在40℃高温下有较强的乙炔还原活性。 本工作利用Southern Blot分子杂交技术, 以Klebsiella pneumoniae的nifA为探针,证明了在K.planticola 19-1中存在nifA-like基因,由nifH-lacZ实验推论其nifA-like基因产物对高温相对稳定。经过大质粒电泳和Southern Blot分子杂交,发现nifA-like基因定位于染色体外的大质粒上。本工作进一步克隆了含有K.plonticola 19-1的nifA-like基因的DNA片段,做了它的限制性酶切图谱,并将nifA-like基因初步定位。

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Background: Polymorphisms of CLEC4M have been associated with predisposition for infection by the severe acute respiratory syndrome coronavirus (SARS-CoV). DC-SIGNR, a C-type lectin encoded by CLEC4M, is a receptor for the virus. A variable number tandem

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运用随机扩增多态性DNA(RAPD)方法对雌核发育和人工转性鲢、鳙进行了遗传多样性的研究,并用长江天然鲢、鳙群体作为对照分析.在雌核发育鲢中,共得到187条带,其中19条为多态带,占10.16%,而对照组鲢共扩增205条带,有32个多态座位,占总带数的15.61%.在雌核发育鳙中共产生232条带,其中11条为多态带,比例为4.74%,而在对照组中共产生241条带,25条为多态带,比例为10.37%.遗传距离分析表明,雌核发育鲢和鳙的平均值分别为0.102和0.023.而对照组鲢和鳙遗传距离平均值分别为0.

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我国对虾暴发性流行病病因初探江育林,张奇亚,刘荭,李彦,李正秋(中国科学院水生生物研究所武汉430072)关键词杆状病毒、对虾病毒病、中国对虾、日本对虾STUDYONCAUSEOFINFECTIONSDISEAESOFPENAEIDSHRIMPINC...

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采用武汉地区胆石症患者胆囊或胆管中的胆石、胆汁及对照组的胆汁,通过原子吸收光谱等方法测定其中18种微量元素的含量。结果发现不同部位结石中的这些微量元素平均含量除铬外均无显著性差异,结石中12种微量元素的含量高于其胆汁中的含量;7种微量元素(铅、钙、砷。、铬、锰、铁、铝)高于对照组中的含量(P均<0.05)。胆石症患者胆汁中钠、钾、铜、铝、镁的平均含量均低于对照组(P<0.05),其它微量元素平均含量与对照组比较差异无显著性意义,本结果对进一步研究结石形成机理与防治措施提供了依据。

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The diversity of gynogenetic, artificial sex reversal and natural silver carp and bighead carp is examined using randomly amplified polymorphic DNA (RAPD) method. All of the 187 bands are obtained and 19 (10.16%) of them are polymorphic in gynogenetic silver carp. Meanwhile 32 (15.61%) out of 205 bands are polymorphic in control group. In gynogenetic bighead carp a total of 232 bands are identified and 11 (4.74%) out of them are polymorphic, while 25 (10.37%) out of 241 bands are polymorphic in control group. The genetic distance of four populations is calculated and it is 0.102 and 0.023 for gynogenetic silver carp and gynogenetic bighead carp respectively. The values of natural silver carp and bighead carp are 0.161 and 0.104. From the UPGMA trees constructed based on genetic distance, the sex reversal individuals that match with the gynogenetic female individuals are picked out. A new breeding process of establishing a pure line is developed.

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A self-organized In0.5Ga0.5As/GaAs quantum island structure emitting at 1.35 mum at room temperature has been successfully fabricated by molecular beam epitaxy via cycled (InAs)(1)/GaAs)(1)monolayer deposition method. The photoluminescence measurement shows that a very narrow linewidth of 19.2 meV at 300 K has been reached for the first time, indicating effective suppression of inhomogeneous broadening of optical emission from the In0.5Ga0.5As island structure due to indium segregation reduction by introducing an AlAs layer and the strain reduction by inserting an In0.2Ga0.8As layer overgrown on the top of islands. The mound-like morphology of the islands elongated along the [1 (1) over bar0] azimuth are observed by the atomic force microscopy measurement, which reveals the fact that strain in the islands is partially relaxed along the [1 (1) over bar0] direction. Our results present important information for the fabrication of 1.3 mum wavelength quantum dot devices.