凝块揭示了光纤网络的异常弹性行为
Andrei Zakharov1,2, Myra Awan3, Terrence Cheng3
1Department of Physics, University of California, Merced, Merced, CA 95343, USA.
Science advances
|January 10, 2024
概括
研究血块机制揭示了纤维素纤维曲刚度影响宏观性质. 减少交叉连接会软化血块并降低血小板诱导的收缩性,通过统一的力学模型来解释.
科学领域:
- 生物物理学的生物物理.
- 材料科学 材料科学 材料科学
- 生物技术是生物技术.
背景情况:
- 软和纤维生物材料表现出适应性机械特性,这对功能至关重要.
- 这些材料对应力和细胞引的宏观机械反应源于复杂的局部变形.
- 了解生物网络的非线性弹性行为,如血栓,是必不可少的.
研究的目的:
- 为了研究血块的非线性弹性行为.
- 了解纤维素纤维特性如何影响宏观凝块力学.
- 开发一个统一的模型,解释凝块软化和减少收缩性.
主要方法:
- 结合了显微镜,风学和弹性网络模型.
- 纳入纤维素纤维拉伸,曲和曲到模型中.
- 抑制纤维素交叉链接,观察对凝块特性的影响.
主要成果:
- 在抑制纤维素交叉链接时观察到宏观剪切反应中的异常软化模式.
- 记录了血小板诱导的血块收缩率的减少.
- 弹性网络模型使用纤维素纤维曲刚度成功解释了这些观察结果.
结论:
- 纤维素纤维曲刚度是控制血凝块机制的一个关键参数.
- 一个基于力学的模型为理解血块的非线性弹性提供了一个框架.
- 这个框架可以扩展到其他活性生物聚合物网络.
相关概念视频
Plastic Behavior
198
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
198
Clot Retraction and Fibrinolysis
6.0K
After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
6.0K
Members Made of Elastoplastic Material
98
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
98
Cell-matrix's Response to Mechanical Forces
2.6K
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...
2.6K


