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Cell-matrix's Response to Mechanical Forces01:13

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...
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Conservation of Mass in Fixed, Nondeforming Control Volume01:07

Conservation of Mass in Fixed, Nondeforming Control Volume

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The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
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Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

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Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
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Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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相关实验视频

Updated: Jun 14, 2025

Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration
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Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration

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加速可变细胞形状分子动力学与位置依赖质量矩阵.

Martin Sommer-Jörgensen1, Marco Krummenacher1, Stefan Goedecker1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland.

Journal of chemical theory and computation
|June 13, 2025
PubMed
概括
此摘要是机器生成的。

质量张量分子动力学 (MTMD) 通过将更高的质量分配给快速振动模式来增强分子模拟. 这种方法加快了模拟,使复杂的分子系统和过渡的研究.

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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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相关实验视频

Last Updated: Jun 14, 2025

Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration
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Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches
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科学领域:

  • 计算化学的计算化学
  • 材料科学 材料科学 材料科学
  • 分子动力学分子动力学

背景情况:

  • 分子动力学 (MD) 模拟由于快速分子振动而受到小时间步骤的限制.
  • 有效模拟分子系统需要克服这些时间尺度限制.

研究的目的:

  • 使用质量张量分子动力学 (MTMD) 提升分子动力学模拟中的时间步骤.
  • 适应MTMD用于可变细胞形状系统,并开发合适的simplectic集成器.

主要方法:

  • 增强哈密尔顿数以一个位置依赖的质量矩阵,基于一个近似的赫森数.
  • 在密度函数理论层面,将MTMD应用于分子晶体 (N-(4-甲基乙烯) -4-甲基氨酸) 和液态水模拟.
  • 开发用于可变细胞形状系统的简单集成器.

主要成果:

  • 实现了4.4倍的时间步骤增加,模拟了N-(4-甲基基烯) -4-甲基兰的多态之间的过渡.
  • 在密度函数理论水平上模拟液态水时获得了2.8倍的加速.
  • 证明了适应的MTMD方法对没有结合变化的分子系统的效率.

结论:

  • 适应的MTMD方法有效地增加了分子系统的模拟时间步骤.
  • 这种方法显著加快了分子配置和过渡的采样.
  • MTMD为提高分子动力学模拟效率提供了一个可行的策略.