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相关概念视频

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Diffusion01:21

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
Facilitated Transport01:19

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...
Facilitated Transport01:19

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...

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Updated: Jun 8, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

在多原子分子通过道扩散的可调性与节奏相比.

Zhihai Cheng1, Eric S Chu, Dezheng Sun

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|September 14, 2010
PubMed
概括
此摘要是机器生成的。

分子步行者的扩散温度可以通过改变它们的结构来调整. 模拟显示四足步行者表现出节奏运动,影响多原子有机分子表面扩散的理解.

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Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing (MTT)
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing (MTT)
12:19

Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing (MTT)

Published on: May 27, 2012

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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科学领域:

  • 表面科学是一门科学.
  • 分子动力学分子动力学
  • 有机化学 有机化学

背景情况:

  • 分子步行器是为跨越基板的单向运动而设计的.
  • 调节扩散特性对于控制表面上的分子运动至关重要.
  • 了解扩散机制有助于设计新的分子系统.

研究的目的:

  • 研究调节分子步行器的扩散温度的方法.
  • 描述四足分子步行者的扩散动态.
  • 评估道挖掘在多原子有机分子表面扩散中的作用.

主要方法:

  • 密度函数理论 (DFT) 模拟被用来建模分子动力学.
  • 通过扩展芳香骨干,添加链接器和环置换来修改分子结构.
  • 分析了扩散模式 (步行,慢跑,滑翔).

主要成果:

  • 扩散温度可以通过结构修改来调节,例如骨干延伸和链接器添加.
  • 四足分子步行者表现出"节奏"的扩散模式.
  • 已识别的扩散模式为量子道效应提供了洞察力.

结论:

  • 结构工程提供了一种控制分子步行者扩散温度的途径.
  • 四足行走者的节奏运动是一个关键的特征.
  • 了解扩散模式对于阐明道挖掘对表面扩散的贡献至关重要.