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Related Concept Videos

The DNA Helix01:16

The DNA Helix

Overview
The DNA Helix01:07

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
DNA Isolation01:34

DNA Isolation

DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.
DNA Topoisomerases02:02

DNA Topoisomerases

Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types.  Type I...

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Related Experiment Video

Updated: Jun 9, 2026

Hybrid Ensemble and Single-molecule Assay to Image the Motion of Fully Reconstituted CMG
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Hybrid Ensemble and Single-molecule Assay to Image the Motion of Fully Reconstituted CMG

Published on: July 26, 2024

Biophysics: Melting trapped DNA.

Nicole Rusk

    Nature Methods
    |September 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Stretching single DNA molecules in nanochannels reveals sequence-specific melting patterns. This DNA analysis technique offers a new way to study genetic information at the molecular level.

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    Last Updated: Jun 9, 2026

    Hybrid Ensemble and Single-molecule Assay to Image the Motion of Fully Reconstituted CMG
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    Studying DNA Looping by Single-Molecule FRET
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    Studying DNA Looping by Single-Molecule FRET

    Published on: June 28, 2014

    Area of Science:

    • Molecular Biology
    • Nanotechnology
    • Genomics

    Background:

    • DNA melting is a critical process in molecular biology, influenced by sequence composition and environmental factors.
    • Nanochannels provide a controlled environment for manipulating and observing single DNA molecules.
    • Understanding DNA melting patterns can reveal information about DNA structure and function.

    Discussion:

    • Single DNA molecules exhibit unique melting patterns when stretched within nanochannels.
    • These patterns are directly correlated with the underlying nucleotide sequence.
    • The physical confinement and stretching in nanochannels alter DNA's thermal stability, making sequence-dependent melting observable.

    Key Insights:

    • Developed a method to visualize DNA sequence information through physical melting patterns.
    • Demonstrated that DNA melting is a sensitive probe for sequence identification.
    • Established a link between DNA sequence, physical stretching, and thermal denaturation.

    Outlook:

    • Potential for high-throughput DNA sequencing and genotyping based on melting signatures.
    • Applications in diagnostics for detecting genetic variations and mutations.
    • Further research into optimizing nanochannel design and imaging techniques for enhanced resolution.