
史上最强PCR原理攻略 - 知乎 - 知乎专栏
聚合酶链式反应(PCR)是一种用于放大扩增特定的DNA片段的分子生物学技术,它可看作是生物体外的特殊DNA复制,PCR的最大特点是能将微量的DNA大幅增加。 1.背景. DNA的半保留复制是生物进化和传代的重要途径。 双链DNA在多种酶的作用下可以变性解旋成单链,在 DNA聚合酶 的参与下,根据碱基互补配对原则复制成同样的两分子拷贝。 在实验中发现,DNA在高温时也可以发生变性解链,当温度降低后又可以复性成为双链。 因此,通过温度变化控制DNA的变性和复 …
Polymerase chain reaction - Wikipedia
PCR allows isolation of DNA fragments from genomic DNA by selective amplification of a specific region of DNA. This use of PCR augments many ways, such as generating hybridization probes for Southern or northern hybridization and DNA cloning , which require larger amounts of DNA, representing a specific DNA region.
Polymerase Chain Reaction (PCR) Fact Sheet - National Human …
2020年8月17日 · Sometimes called "molecular photocopying," the polymerase chain reaction (PCR) is a fast and inexpensive technique used to "amplify" - copy - small segments of DNA. Because significant amounts of a sample of DNA are necessary for molecular and genetic analyses, studies of isolated pieces of DNA are nearly impossible without PCR amplification.
PCR技术基本原理 - 知乎 - 知乎专栏
聚合酶链反应简称PCR,是 以DNA半保留复制机制为基础,发展出的 体外酶促合成、扩增特定核酸片段的一种方法。 DNA复制是模板依赖性的, 必须以亲代DNA链作为模板,亲代DNA的两股链解开后,可分别作为模板进行复制。 同时,DNA复制需要 以四种脱氧核糖核苷酸,即dATP、dGTP、dCTP、dTTP,为底物合成子代DNA。 在体外进行DNA复制时,模板和底物均可通过人工添加解决。 DNA聚合酶必须以一段 具有3’端自由羟基(3’-OH)的RNA作为引物,才能开始合 …
聚合酶链式反应 - 维基百科,自由的百科全书
聚合酶連鎖反應 (英語: Polymerase chain reaction, 縮寫: PCR)又稱 多聚酶链式反應,是一项利用 DNA双链复制 的原理,在生物体外复制特定DNA片段的核酸合成技术。 透过这項技术,可在短时间内大量扩增 目的基因 (標的基因) [1][2],而不必依賴 大腸桿菌 或 酵母菌 等生物體。 DNA 体外扩增的实现首先基于DNA半保留复制原理,还有碱基互补配对原则,即复制的过程中双链DNA会解链,由双链变成单链,温度一般为95℃;之后温度降下来,引物会结合到DNA单 …
DNA Extraction and Polymerase Chain Reaction - PMC
DNA extraction and polymerase chain reaction (PCR) are the basic techniques employed in the molecular laboratory. This short overview covers various physical and chemical methods used for DNA extraction so as to obtain a good-quality DNA in ...
PCR基因扩增原理和基本程序 - 知乎 - 知乎专栏
聚合酶链式反应(PCR,Polymerase Chain Reaction)是一种用于扩增特定DNA片段的技术。 PCR技术利用DNA聚合酶在体外合成DNA的能力,通过一系列高温变性、低温退火和中温延伸循环,实现特定DNA序列的多次复制,从而…
Polymerase Chain Reaction (PCR) - National Human Genome …
3 天之前 · Polymerase chain reaction (abbreviated PCR) is a laboratory technique for rapidly producing (amplifying) millions to billions of copies of a specific segment of DNA, which can then be studied in greater detail.
Biochemistry, Polymerase Chain Reaction - StatPearls - NCBI Bookshelf
2023年7月30日 · PCR is a laboratory technique to amplify specific DNA segments for various laboratory and clinical applications. Building on the work of Panet and Khorana’s successful amplification of DNA in-vitro, Mullis and coworkers developed PCR in the early 1980s, having been met with a Nobel prize only a decade later.
Polymerase Chain Reaction (PCR)- Principle, Steps, Applications
2022年9月2日 · PCR is an enzymatic process in which a specific region of DNA is replicated over and over again to yield many copies of a particular sequence. The most widely used target nucleic acid amplification method is the polymerase chain reaction (PCR).