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A strip of eight PCR tubes, each containing a 100 μL reaction mixture Placing a strip of eight PCR tubes into a thermal cycler. The polymerase chain reaction (PCR) is a method widely used to make millions to billions of copies of a specific DNA sample rapidly, allowing scientists to amplify a very small sample of DNA (or a part of it) sufficiently to enable detailed study.
The thermal cycler (also known as a thermocycler, PCR machine or DNA amplifier) is a laboratory apparatus most commonly used to amplify segments of DNA via the polymerase chain reaction (PCR). [1] Thermal cyclers may also be used in laboratories to facilitate other temperature-sensitive reactions, including restriction enzyme digestion or rapid ...
A real-time polymerase chain reaction (real-time PCR, or qPCR when used quantitatively) is a laboratory technique of molecular biology based on the polymerase chain reaction (PCR). It monitors the amplification of a targeted DNA molecule during the PCR (i.e., in real time), not at its end, as in conventional PCR. Real-time PCR can be used ...
A quantitative PCR instrument [1] is a machine that amplifies and detects DNA. It combines the functions of a thermal cycler and a fluorimeter , enabling the process of quantitative PCR . The first quantitative PCR machine was described in 1993, [ 2 ] and two commercial models became available in 1996.
PCR is currently the most widely used method for detection of DNA sequences. [22] The detection of the marker might use real time PCR, direct sequencing, [2]: ch 17 microarray chips—prefabricated chips that test many markers at once, [2]: ch 24 or MALDI-TOF [23] The same principle applies to the proteome and the genome.
Therefore, adequate measures to avoid contamination from any DNA present in the lab environment (bacteria, viruses, or human sources) are required. Because products from previous PCR amplifications are a common source of contamination, many molecular biology labs have implemented procedures that involve dividing the lab into separate areas. [1]
DNA spiking can also refer to a spike control in PCR, which is when DNA is added to a sample that will provide some signal (e.g. a plasmid or some synthetic DNA with a specific known sequence) to a reaction, and seeing if the reaction will amplify. This method is used to discover if the PCR method is working correctly, as in a PCR machine it ...
RT-PCR is commonly used in research methods to measure gene expression. For example, Lin et al. used qRT-PCR to measure expression of Gal genes in yeast cells. First, Lin et al. engineered a mutation of a protein suspected to participate in the regulation of Gal genes. This mutation was hypothesized to selectively abolish Gal expression.
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