外部施加力的机械化学转导到机械孔
Jordi Ribas-Arino1, Motoyuki Shiga, Dominik Marx
1Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany. jribasjr@yahoo.es
Journal of the American Chemical Society
|July 29, 2010
概括
阿利法性聚合物链显著影响机械孔破裂力,根据链条长度显示奇偶效应. 这一发现影响了力谱学和聚合物的机械化学操纵.
科学领域:
- 聚合物物理 聚合物物理
- 机械化学 机械化学
- 理论化学 理论化学
背景情况:
- 机械是强迫光谱和超声波实验的核心.
- 了解聚合物链对力转导的影响对于机械化学应用至关重要.
研究的目的:
- 从理论上研究形聚合物链在力转导到机械孔中的作用.
- 分析机械孔破裂力对聚合物链长度的依赖性.
主要方法:
- 使用基于灾难理论的严格方法.
- 采用力转换的Hessian来分析结构参数和力常数.
主要成果:
- 证明了突破力对聚合物链长度的显著依赖,包括奇偶依赖.
- 与链接处的局部机械孔扭曲相关的破裂力.
- 揭示了聚合物链中和力常数的令人惊的力量依赖性.
结论:
- 在机械化学操作中必须明确考虑聚合物链.
- 定制强力传导聚合物链提供了一种调整机械响应性聚合物特性的方法.
相关概念视频
Mechanically-gated Ion Channels
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...
Mechanically-gated Ion Channels
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...
Tension Response at Adherens Junctions
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
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Cell-matrix's Response to Mechanical Forces
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.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Mechanical Protein Functions
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.


