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相关概念视频

Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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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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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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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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Types of Membrane Protrusions01:28

Types of Membrane Protrusions

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The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
The microvilli, an example of stable protrusions, are finger-like projections...
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Forming, Confining, and Observing Microtubule-Based Active Nematics
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被动缺陷驱动的基质膜中的形态发生.

D J G Pearce1, C Thibault2, Q Chaboche2

  • 1University of Geneva, Department of Theoretical Physics, 1211 Geneva, Switzerland.

Physical review letters
|February 6, 2025
PubMed
概括
此摘要是机器生成的。

具有拓缺陷的流体膜可以自发形成形状,推动形态发生. 弹性参数和边界约束决定了曲面上的变形模式和缺陷融合.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 生物物理学的生物物理.
  • 软物质物理学 软物质物理学

背景情况:

  • 在生物和合成材料中,方向顺序是普遍存在的.
  • 拓缺陷是方向顺序中的不连续性,通常与材料几何学有关.
  • 这些缺陷在材料特性和形态发生过程中起作用.

研究的目的:

  • 使用具有 +1 拓缺陷的流体膜来建模形态发生.
  • 研究这些膜的平衡形状和变形机制.
  • 了解弹性参数和边界约束对膜形态学的影响.

主要方法:

  • 使用计算模拟来建模膜行为.
  • 使用分析计算来得出理论预测.
  • 分析曲表面上的伸展,扭曲和曲扭曲的相互作用.

主要成果:

  • 膜自发地变形成圆形状,缺陷处于顶部.
  • 这些变形的稳定性取决于弹性参数的平衡.
  • 在边界约束下出现了三种不同的变形模式,涉及导向场扭曲.
  • 证明了反向解决方案和+1/2拓缺陷对的融合.

结论:

  • 确定了流体膜中被动,缺陷驱动的形态发生机制.
  • 变形模式与主导场扭曲的管理密切相关.
  • 这项研究提供了对可变形表面上的拓缺陷行为的洞察.