Is a PCR graph sigmoid? A PCR graph is usually sigmoid when you are looking at a real-time PCR or qPCR amplification curve on a normal linear fluorescence scale. The curve starts flat, rises sharply as DNA copies build up, and then levels off when reagents become limited. That “S-shaped” pattern is the classic PCR […]
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What should you know about melt curves in real-time PCR? A melt curve in real-time PCR is a post-amplification check that helps show whether your qPCR reaction produced one clean DNA product or a mixture of products. After PCR amplification, the instrument slowly heats the reaction. As the double-stranded DNA separates into single strands, the
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How to Read PCR Curves: A Practical Guide to Ct Values, Amplification Plots, Melt Curves, and Strange Results PCR curves can look confusing at first, especially when one sample rises early, another rises late, and a control gives a tiny signal you did not expect. A good PCR curve usually has a quiet baseline, a
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How is gene expression measured with PCR? PCR measures gene expression by first turning RNA into complementary DNA, then tracking how much of that DNA builds up during amplification. The method most often used is called reverse transcription quantitative PCR, or RT-qPCR. It checks how active a gene is by measuring how much messenger RNA,
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What are the main PCR curve types? PCR curves are graphical patterns that show how DNA or RNA targets behave during amplification, melting, or quantification. The main types include amplification curves, baseline curves, exponential curves, linear or log-linear curves, plateau curves, melt curves, derivative melt curves, standard curves, and abnormal curves such as late, flat,
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