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相关概念视频

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

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In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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相关实验视频

Updated: May 10, 2025

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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活性布朗粒子的单档扩散.

Akinlade Akintunde1, Parvin Bayati1, Hyeongjoo Row2

  • 1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

The Journal of chemical physics
|April 22, 2025
PubMed
概括

这项研究研究了局限活跃系统中的单个文件扩散. 我们开发了一种平均平方位移的分析表达式,展示了粒子自推力如何影响受限几何体中的移动性和运输.

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科学领域:

  • 物理 物理学 物理
  • 物理化学 物理化学
  • 软物质物理学 软物质物理学

背景情况:

  • 单档扩散 (SFD) 描述了粒子在狭窄空间中的运输,其中粒子不能互相超越.
  • 这种受约束的运动导致异常扩散,这是生物和物理系统中的关键现象.
  • 活跃的布朗粒子 (ABP) 是自我驱动的合体的最小模型,表现出独特的运输动态.

研究的目的:

  • 通过模拟和理论来研究非热活性布朗粒子 (ABP) 的单档扩散.
  • 为了获得一个准确的分析表达式,这个系统中的标记粒子的平均平方位移 (MSD).
  • 了解自动推进如何影响1D移动性及其与系统压缩性的关系.

主要方法:

  • 布朗动力学模拟被用于模拟粒子行为.
  • 分析理论是为了补充模拟结果而开发的.
  • 这项研究建立在先前的工作基础上,为SFD ABP系统推导动力温度,压力和压缩能力.

主要成果:

  • 在短时间内,MSD显示弹道性行为,受系统运动温度的影响.
  • 在长时间内,SFD的特征性亚扩散缩放 ((Δx) 2∼t1/2) 保持.
  • 自动推进显著改变1D移动性,这与系统的压缩能力直接相关.

结论:

  • 成功开发了SFD ABP系统中MSD的分析框架.
  • 广义的1D移动概念适用于具有轻微调整的活跃系统.
  • 结果提供了关于活性粒子传输和微尺度属性调整在狭窄几何体的见解.