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相关概念视频

Mechanically-gated Ion Channels01:12

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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In mechanical engineering, the concept of equivalent couples plays a crucial role in understanding and analyzing various mechanical systems.
Two couples are considered to be equivalent if they produce the same rotational effect on a rigid body. In other words, the two couples have the same magnitude and act in the same direction, causing the same angular displacement or acceleration in the body.
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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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机械化学活性子 机械化学活性子

Artem Ryabov1,2,3, Mykola Tasinkevych4,5,6,7

  • 1Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 , Praha 8, Czech Republic.

Scientific reports
|November 23, 2023
PubMed
概括
此摘要是机器生成的。

科学家们开发了一种新方法来控制微小的自动推进纳米粒子的运动. 通过使用杆电位和横向力,波动被转化为定向运动,使人造分子电机成为可能.

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科学领域:

  • 物理 物理学 物理
  • 化学 化学 化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 自行推进的纳米粒子,或纳米游泳器,显示作为人工分子电机的承诺.
  • 控制纳米游泳运动是具有挑战性的,因为纳米尺度的速度波动.

研究的目的:

  • 描述一种控制纳米游泳运动的机制,使用杆电位.
  • 将纳米尺度波动转化为活性纳米粒子的净定向电流.

主要方法:

  • 利用一种由化学反应驱动的自行推进的通用模型.
  • 引入了一个杆电位来指导纳米粒子运动.
  • 施加一个恒定的横向力来触发定向运动.

主要成果:

  • 演示了一种机制,该机制将速度波动转换为沿着杆的方便方向沿着净电流.
  • 净运动源于合的化学和机械过程.
  • 电流的大小对杆属性和横向力强度敏感.

结论:

  • 强调纳米级活性物质热力学一致建模的重要性.
  • 建议新的策略来控制纳米游泳者的动态.
  • 实现分子尺寸电机和纳米技术应用的潜在进展.