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Related Concept Videos

DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
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Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
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Electrophoresis: Overview01:20

Electrophoresis: Overview

Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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...
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...

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Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
11:21

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers

Published on: August 30, 2024

Tether forces in DNA electrophoresis.

Ulrich F Keyser1, Stijn van Dorp, Serge G Lemay

  • 1Cavendish Laboratory, University of Cambridge, Cambridge, UKCB3 0HE. ufk20@cam.ac.uk

Chemical Society Reviews
|February 25, 2010
PubMed
Summary
This summary is machine-generated.

This review explains how electric fields generate forces on charged molecules in solution. It covers fundamental electrophoresis concepts and direct measurements of DNA electrophoretic forces.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Molecular Biology

Background:

  • Electrophoresis is a fundamental technique for separating charged molecules.
  • Understanding the forces acting on charged species in solution is crucial for various applications.
  • Direct measurement of these forces provides insights into molecular behavior.

Purpose of the Study:

  • To introduce the fundamental concepts of force generation on charged objects by electric fields.
  • To provide a conceptual understanding of electrophoresis, avoiding complex quantitative modeling.
  • To discuss experimental methods for directly measuring electrophoretic forces, particularly on DNA.

Main Methods:

  • Conceptual explanation of electrostatic interactions and force generation.
  • Review of experimental techniques, including optical tweezers, for force measurement.
  • Focus on idealized scenarios for clarity.

Main Results:

  • Detailed explanation of how external electric fields induce forces on charged molecules.
  • Demonstration of the principles behind electrophoresis through conceptual examples.
  • Presentation of experimental data illustrating direct measurement of DNA electrophoretic forces.

Conclusions:

  • The fundamental principles of electrophoresis are accessible through conceptual understanding.
  • Direct force measurements are essential for validating theoretical models and understanding molecular behavior.
  • This review serves as a foundational resource for researchers in electrophoresis, DNA analysis, and nanopore technology.