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Formalin-fixed sections of rat intestine were treated in a solution of 0.5% periodic acid in 50% aqueous phosphoric acid for the concurrent demonstration of 1,2-glycols and DNA. The effects of varying the concentration of reagents, time of exposure and temperature on the results showed that, at 28°C, good reactions were obtained in 10-15 min when the concentration of the phosphoric was between 40 and 60% and that of the periodic acid between 0.05 and 0.50%. 相似文献
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目的:探究核酸纯化柱提取核酸定量检测血浆标本中丙型肝炎病毒核糖核酸(HCV-RNA)的临床应用效果。方法:将2013年8-11月期间我院600例抗-HCV阳性丙肝患者的样本,按随机字数表法分为研究组对照组各300例,分别采用核酸纯化柱和酚-氯仿提取法检测,采用实时荧光定量聚合酶链反应(FQ-PCR)技术定量检测两组HCV-RNA水平。结果:研究组检测阳性率为87.67%(263/300),显著高于和对照组的54.0%(162/300),差异有统计学意义(X2=82.296,P=0.000);两组HCV-RNA检测水平差异无统计学意义(u=1.721,P=0.067)。结论:核酸柱提法定量检测血浆HCV-RNA操作简单、快速,分离效率高,容易掌握,值得临床推广。 相似文献
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Abstract
Short oligonucleotide and peptide replicators have been described. To determine whether cross-replication could have occurred
between such systems, we have attempted to show that peptides can specifically template the ligation of nucleic acids. A complex
between a 35-mer anti-Rev RNA aptamer and a 17-mer arginine-rich motif (ARM) peptide from the HIV-1 Rev protein served as
a model system. Aptamer half-molecules were activated for ligation via two activation chemistries, representing two distinct
kinetic possibilities for early replicators. Cyanogen bromide activation was transient relative to oligonucleotides that terminated
with a 5′-iodine and a 3′phosphorothioate, respectively. The Rev ARM specifically enhanced the degree or rate of ligation
by both methods: there was a 10-fold increase in the production of full-length aptamer in the presence of cyanogen bromide
and a 5.9- to 7.6-fold enhancement in the rate of ligation for stably activated aptamer half-molecules. These results support
the possibility that life could have originated with peptide replicators and transitioned to nucleic acid replicators or that
peptide and nucleic acid replicators could have been interdependent. 相似文献
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《Nucleosides, nucleotides & nucleic acids》2013,32(5-8):1191-1194
Abstract The fluorinated olefinic peptide nucleic acid analogue (F-OPA) monomer containing the base thymine was synthesised in 13 steps. PNAs containing this unit were prepared and their pairing properties assessed by means of UV-melting experiments. 相似文献
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2020年初至今,新型冠状病毒肺炎(COVID-19)疫情仍在全球多个国家流行,给全球公共卫生安全造成了严重威胁.中国在应对COVID-19的实践中,最先完成病毒核酸测序并共享序列信息,最早有效控制疫情蔓延、恢复生产,并在病毒作用人体机制研究、疫苗研发、中和性抗体发现等环节均处于世界前沿.其中,针对病毒核酸的检测工作—... 相似文献
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Audrey Farese Sandrine Pairot Nadia Patino Vkronique Ravily Roger Condom Andreacute; Aumelass 《Nucleosides, nucleotides & nucleic acids》2013,32(10-11):1893-1906
Abstract The liquid phase synthesis of “polyamide nucleic acid” (PNA) dimers containing the purine nucleic acid bases adenine and guanine has been achieved in good yields. This strategy was elaborated in order to circumvent difficult direct coupling of protected PNA monomers. This method can be applied to the liquid phase synthesis of short protected polyPNAs fragments, which can then selectively be deprotected. 相似文献
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《Nucleosides, nucleotides & nucleic acids》2013,32(5-8):1029-1033
Abstract The Pd0/CuI catalyzed cross-coupling of terminal alkynes onto peptide nucleic acid monomers or submonomers bearing iodinated nucleobases has been utilized as a route to base-modified oligomers. Both 5-iodouracil and 5-iodocytosine derivatives undergo the cross-coupling to give the expected products in moderate to good yields. However, depending on the particular substrates and reaction conditions, the cross-coupling may be followed by a ring closing reaction to give the fluorescent furano- and pyrrolo-fused uracil and cytosine derivatives, respectively. 相似文献
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为研究玻璃粉在植物核酸提取中的应用,比较了玻璃粉颗粒大小、离液盐种类及浓度、pH等条件对玻璃粉吸附核酸的影响,得出玻璃粉吸附核酸的各种最佳条件。结果表明,普通玻璃粉吸附核酸能力强于硅胶和硅藻土,玻璃粉颗粒的直径以83 μm为佳,pH 4.0时吸附效果达到最大。提取DNA时,NaCl浓度应大于3 mol/L,而提取RNA时,异硫氰酸胍大于2 mol/L就能取得很好的效果,此外,在玻璃粉吸附RNA前,需要加入50%以上的无水乙醇才能更好地吸附。利用玻璃粉制作简易纯化柱,可用于植物组织核酸提取纯化,所提取的核酸纯度高、完整性好,可用于酶切、杂交和PCR等实验。与传统方法相比,采用玻璃粉简易离心柱提取植物核酸,效果好、环保、快速、经济。 相似文献
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采用PXY104(含化学合成的HIV-env26肽基因4重串联体结构)为材料。温和裂解法提取质粒DNA,制备电泳纯化,Hind Ⅲ和EcoR Ⅰ酶解,低融点琼脂糖凝胶电泳回收HIV-DNA片段作为核酸探针;用[α-~(32)P]dATP通过缺口移位法标记,比放射性为4.05—6.69×10~7cpm/μgDNA通过分子杂交能测出lPg的靶DNA,初步试验结果表明,在本文试验条件下,可用该探针检测与之互补的核酸分子。 相似文献
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