相关实验视频
Updated: Jul 13, 2025

06:37
Quantifying Cytoskeleton Dynamics Using Differential Dynamic Microscopy
Published on: June 15, 2022
3.6K
异常扩散,非ergodicity,非Gaussianity,与非线性时钟的分数布朗运动的衰老
Yingjie Liang1,2, Wei Wang2, Ralf Metzler2,3
1College of Mechanics and Materials, Hohai University, 211100 Nanjing, China.
Physical review. E
|October 18, 2023
概括
非线性时间和空间时钟将像分数布朗运动 (FBM) 这样的ergodic过程转化为非ergodic,衰老行为. 这项研究引入了缩放式微分布朗运动 (SFBM) 来建模这些复杂的扩散模式.
科学领域:
- 统计物理 统计物理
- 复杂的系统复杂的系统.
- 随机过程 随机过程
背景情况:
- 像微分布朗运动 (FBM) 这样的ergodic过程通常表现出可预测的统计性质.
- 在复杂的系统中,了解与ergodicity的偏差,如衰老和非高斯性,至关重要.
- 时间或空间中的非线性转换可以从根本上改变随机过程动态.
研究的目的:
- 研究非线性时间和/或空间时钟如何影响随机过程的特性.
- 确定在这种条件下, ergodic 过程如何获得 nonergodic 和老化特征.
- 开发和分析一个通用的随机过程,缩放的分数布朗运动 (SFBM),以建模这些效应.
主要方法:
- 发展和分析尺度分数布朗运动 (SFBM) 过程.
- 使用非线性时钟的FBM构建时间和空间SFBM.
- 统计特征的量化,包括非高斯性,非埃尔戈迪性和老化.
- 计算机模拟用于验证各种时钟功能的分析预测.
主要成果:
- 基于选定的非线性时钟,SFBM成功模拟了异常,超慢和超快的扩散.
- 非线性时钟诱导非高斯位移分布,非ergodicity,和老化在FBM.
- 模拟结果与概率密度函数,平均平方位移和衰老因子的分析预测保持一致.
结论:
- 非线性时间和空间时钟是随机过程中出现的非精力和衰老行为的主要驱动因素.
- SFBM为描述在单分子追踪中观察到的复杂扩散现象提供了一个多功能框架.
- 该研究提供了关于合理化非线性动态对FBM类型过程的影响的见解.
相关概念视频
The de Broglie Wavelength
25.9K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
25.9K
Diffusion on Chromatography Columns
563
In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
563
Protein Diffusion in the Membrane
4.4K
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...
4.4K
Aging
59
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
59
Atomic Nuclei: Types of Nuclear Relaxation
310
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
310
Protein Dynamics in Living Cells
2.1K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K

