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相关概念视频

The DNA Helix01:16

The DNA Helix

Overview
Arrhenius Plots02:34

Arrhenius Plots

The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used to...
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...
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. 
Microtubules and motor proteins exert two types of forces on...
Force and Potential Energy in One Dimension01:13

Force and Potential Energy in One Dimension

Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
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. 
Microtubules and motor proteins exert two types of forces on...

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相关实验视频

Updated: Jul 14, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
08:48

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

曲线DNA分子的动力学:预测和实验.

Tali E Haran1, Ilana Cohen, Alexander Spasic

  • 1Department of Biology, Technion, Technion City, Haifa 32000, Israel.

Journal of the American Chemical Society
|October 14, 2005
PubMed
概括

我们在凝上开发了一种DNA片段迁移模型,考虑了DNA结构和缓冲条件. 这个模型解释了像MPD这样的溶剂如何影响DNA运动,揭示了较弱的A-tract-solvent相互作用.

科学领域:

  • 生物物理学的生物物理.
  • 分子生物学分子生物学
  • 物理化学 物理化学

背景情况:

  • 在聚烯胺凝上的DNA迁移对于分离和分析至关重要.
  • 了解缓冲条件和溶剂对DNA动态的影响至关重要.
  • 以前的研究还没有完全阐明有机溶剂在DNA迁移中的作用.

研究的目的:

  • 在聚烯胺凝上开发DNA片段迁移的定量预测模型.
  • 为了研究2-甲基-2,4-二醇 (MPD) 对阶段A通道的凝迁移的影响.
  • 为了澄清DNA,缓冲元件和有机溶剂之间的相互作用.

主要方法:

  • 开发了一种包含DNA结构特征,水力动力相互作用和缓冲性质的定量预测模型.
  • 考虑了静电持久长度,结构波动和溶剂对水性质的影响.
  • 分析了内在曲的DNA片段和分阶段的A片段的迁移动态.

主要成果:

  • 该模型准确地描述了聚烯胺凝上的DNA片段的迁移动态.
  • 量化地解决了MPD对分阶段A通道迁移的影响.
  • 发现A-tract-溶剂相互作用不如A-tract-A-tract和溶剂-溶剂相互作用.

更多相关视频

Studying DNA Looping by Single-Molecule FRET
11:27

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

相关实验视频

Last Updated: Jul 14, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
08:48

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

Studying DNA Looping by Single-Molecule FRET
11:27

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

结论:

  • 开发的模型提供了一个强大的框架,可以在各种条件下预测DNA迁移.
  • 这项研究解决了MPD对DNA凝电泳的影响的模两可.
  • 不同的相互作用亲和性解释了MPD对DNA迁移模式的观察到的影响.