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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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The de Broglie Wavelength02:32

The de Broglie Wavelength

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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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Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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相关实验视频

Updated: Jun 11, 2025

Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers

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粒子壁对齐相互作用和通过狭窄道的活跃布朗扩散.

Poulami Bag1, Shubhadip Nayak1, Pulak Kumar Ghosh1

  • 1Department of Chemistry, Presidency University, Kolkata-700073, India. pulak.chem@presiuniv.ac.in.

Soft matter
|October 9, 2024
PubMed
概括

粒子壁相互作用显著控制活体物种在狭窄道中的扩散. 垂直于墙壁的稳定对齐降低了扩散率,而尖的角度会使其呈指数增大,影响微/纳米物体的传输.

科学领域:

  • 物理 物理学 物理
  • 化学工程是化学工程的重要组成部分.
  • 材料科学 材料科学 材料科学

背景情况:

  • 活性粒子表现出自我推进,导致复杂的运输行为.
  • 狭窄的几何形状,就像狭窄的通道一样,显著改变了粒子动态.
  • 粒子壁相互作用对于决定微/纳米系统中的运输现象至关重要.

研究的目的:

  • 以数值研究粒子壁对齐相互作用如何影响活体物种扩散.
  • 分析相对于通道壁的自动推进速度方向对扩散的影响.
  • 了解粒子属性的作用,如有限扩散中的奇拉性.

主要方法:

  • 使用数值模拟来建模活性粒子扩散.
  • 这项研究集中在一个没有结构的,狭窄的二维通道上.
  • 基于自我推进速度与边界的对齐,分析了粒子壁相互作用.

主要成果:

  • 当速度垂直于墙壁时,扩散率与对齐扭矩的平方成反比例.
  • 扩散与速度和墙壁之间的急性角度的对齐相互作用呈指数级增大.
  • 对齐相互作用的影响取决于粒子的自我推进和性.

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结论:

  • 粒子壁相互作用对于控制狭窄通道中的活性粒子运输至关重要.
  • 相对于墙壁的自我推进的方向决定了扩散行为.
  • 结果提供了关于生物和人工微/纳米物体在封闭环境中的扩散的见解.