惰性记忆在分子运输中通过纳米孔膜的效应.
Slobodanka Galovic1, Milena Čukić2, Dalibor Chevizovich1
1Vinca Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovica Alasa 12-14, P.O. Box 522, 11001 Belgrade, Serbia.
Membranes
|January 24, 2025
概括
纳米孔膜中的粒子传输与经典的扩散有所不同. 结合惯性记忆的新因果模型显示,度变化以阻尼波的形式传播,与Fick不同.
科学领域:
- 物理与材料科学 物理与材料科学
- 化学工程是化学工程的重要组成部分.
- 生物物理学的生物物理.
背景情况:
- 纳米孔膜表现出微尺度异质性,导致粒子运输偏离经典的扩散模型,如菲克的第二定律.
- 经典的扩散模型由于非因果关系和对度扰动无限传播速度的预测而在物理上不可持续.
- 了解纳米孔材料中的异常传输对于各种科学和技术应用至关重要.
研究的目的:
- 导出和验证纳米孔膜中粒子运输的因果模型,解决经典扩散的局限性.
- 研究惯性记忆效应在这些异质结构内的异常运输现象中的作用.
- 将新开发的因果模型的预测能力与经典的Fickian模型进行比较.
主要方法:
- 导出两个新的粒子运输因果模型,扩展Fick的第二定律.
- 将惯性记忆效应,特别是指数式记忆和功率定律色记忆纳入运输模型.
- 对模型预测的相互比较分析以及对经典扩散模型的比较分析.
主要成果:
- 这两种衍生因果模型都预测度扰动以阻尼波的形式传播,与经典的扩散有所不同.
- 与经典模型相比,因果模型表明累积分子运输达到稳定状态的时间较长.
- 功率定律色记忆模型特别预测实现静止状态的时间更长.
结论:
- 开发的因果模型通过考虑惯性记忆,提供了更具物理现实性的纳米孔膜中的粒子运输描述.
- 这些发现突显了记忆效应在理解非Fickian扩散及其对膜行为的影响方面的重要性.
- 该研究为细胞生理学,药物输送和纳米孔膜设计的应用提供了改进的理论框架.
相关概念视频
01:17Pore Transport and Ion-Pair Transport
342
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
342
01:44The Significance of Membrane Transport
22.3K
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
22.3K
01:24Protein Diffusion in the Membrane
4.3K
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...
4.3K
01:16Facilitated Diffusion
285
The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
285
01:29Primary Active Transport
9.7K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
9.7K
01:18Fluid Movement Between Compartments
456
The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
456