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関連する概念動画

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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関連する実験動画

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

トンネリングによる多原子分子の拡散におけるタナビリティと,ペースアップの対比.

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
まとめ
この要約は機械生成です。

分子ウォーカーの拡散温度は,その構造を変えることで調整できます. シミュレーションでは,四足歩行者がペースの動きを示し,多原子有機分子表面拡散の理解に影響を与えることを明らかにしています.

さらに関連する動画

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
05:51

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

Published on: July 19, 2019

関連する実験動画

Last 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

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
05:51

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

Published on: July 19, 2019

科学分野:

  • 表面科学とは,地表科学のことである.
  • 分子ダイナミクス 分子ダイナミクス
  • オーガニック・ケミストリー オーガニック・ケミストリー

背景:

  • 分子ウォーカーは,基板を横断する一方的な動きのために設計されています.
  • 拡散特性を調節することは,表面上の分子運動を制御するために非常に重要です.
  • 拡散メカニズムの理解は,新しい分子システムの設計を伝える.

研究 の 目的:

  • 分子ウォーカーの拡散温度を調節する方法を調査する.
  • 四足の分子ウォーカーの拡散ダイナミクスを特徴づけるために.
  • 多原子有機分子の表面拡散におけるトンネル掘削の役割を評価する.

主な方法:

  • 密度関数理論 (DFT) シミュレーションは,分子動態をモデル化するために使用されました.
  • 分子構造は,芳香的背骨を拡張し,リンクナーを追加し,リングの置換によって変更されました.
  • 拡散モード (ペース,トロッティング,グライディング) を分析した.

主要な成果:

  • 拡散温度は,バックボーン拡張やリンクヤー追加などの構造変更によって調整可能です.
  • 四足の分子ウォーカーは"ペース"の拡散モードを示しています.
  • 識別された拡散モードは,量子トンネリング効果の洞察を提供します.

結論:

  • 構造工学は,分子ウォーカーの拡散温度を制御するための経路を提供します.
  • 四足歩行者のペースの動きは,重要な特徴です.
  • 拡散モードを理解することは,地表拡散に対するトンネル掘削の貢献を明らかにするために不可欠です.