Pcr Fragments
Pcr Fragments - Related Videos
04:21
Microfluidic Capillary Electrophoresis for Fragment Sizing of PCR Products: A Microchip-Based Electrophoretic Separation Technique to Separate DNA Fragments Based on Size
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2025
This video describes the microfluidic capillary electrophoresis technique to separate PCR amplicons based on their size. This technique helps in fragment sizing using fluorescent dyes and standard molecular size markers.
06:13
Electroeluting DNA Fragments
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Cited by 8 •
2010
This procedure allows the purification of DNA fragments with high yield.
02:31
Habitat Fragmentation
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2020
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition. Perforation and dissection often occur during the initial stages of...
13:27
PCR: The Polymerase Chain Reaction
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2023
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling – cyles of temperature changes at fixed time intervals. Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dNTPs. There are three steps in PCR: denaturation, annealing, and elongation. Denaturation is the first step in the cycle and causes the DNA to melt by disrupting hydrogen bonds between the bases resulting in single-stranded DNA. Annealing...
03:41
Agarose Gel Electrophoresis of DNA Amplicons Post PCR: A Method to Analyze Products of Multiplex PCR and Evaluate PCR Reaction Success
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2025
In this video, we demonstrate the separation of bacterial PCR-amplified DNA using agarose gel electrophoresis. Agarose gel functions as a molecular sieve, enabling the negatively-charged DNA to migrate based upon their size under an applied electric field.
FAQs
The primer pair determines the boundaries of the amplified region, so the distance between the primer-binding sites establishes the expected fragment length. This predictable size helps researchers assess whether amplification corresponds to the intended genetic target and provides a basis for examining products by gel electrophoresis or for selecting them for further analysis.
Each cycle separates the DNA strands, allows primers to anneal to complementary target sequences, and uses a thermostable DNA polymerase to extend new copies. Repeating these steps increases the number of copies of the selected region, producing enough material for detection, genetic characterization, sequencing, or cloning.
Gel electrophoresis provides a way to evaluate the amplified products, including whether fragments of the expected size are present. Sequencing can provide genetic information about the amplified region, while cloning allows the products to be carried into a downstream analysis. These options support different levels of fragment characterization.
Amplified products can target genetic regions associated with an infectious agent, allowing researchers to detect the agent and investigate sequence differences among samples. When those products are genetically characterized, the resulting information can support strain identification and analysis of variation relevant to pathogen research.
Researchers first select a genetic region and use primers to direct amplification through repeated denaturation, annealing, and extension cycles. They then examine the resulting products with gel electrophoresis or analyze them by sequencing or cloning. The selected workflow depends on whether the goal is product evaluation or deeper genetic characterization.
The products can support analysis of both infectious-agent sequences and immune-related genes, linking molecular detection with questions about host responses and genetic variation. By comparing amplified regions through downstream analysis, researchers can investigate how pathogen diversity and host genetic features relate to immune-related aspects of infection.