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関連する概念動画

Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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...
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...
Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport01:23

Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport

Drugs need to permeate cell membranes to reach their target sites after administration. Orally administered drugs must transcend intestinal epithelial membrane barriers to infiltrate the systemic circulation. Drugs with a molecular weight of less than 500 Daltons diffuse through gaps between neighboring cells, called paracellular pathways.
However, most drugs use the transcellular route, traversing directly through the cell membranes via two mechanisms: passive and active transport. Passive...

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関連する実験動画

Updated: Jun 3, 2026

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales
12:32

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales

Published on: November 25, 2020

ランダムメディアのモードを通した輸送.

Jing Wang1, Azriel Z Genack

  • 1Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA.

Nature
|March 18, 2011
PubMed
まとめ

量子レベルや古典的モードのような複雑な媒体の興奮を分析した. 研究者は,マイクロ波場のスペックルパターンを分解し,破壊的な干渉を明らかにし,波と粒子拡散の記述を調和させました.

科学分野:

  • 複雑で無秩序な媒介における波の伝播.
  • 量子カオスとランダムマトリックス理論.
  • 統計力学と凝縮物質物理学.

背景:

  • 複雑なシステムの興奮は,固有状態 (レベル/モード) の重組である.
  • ウィーグナー推論は,エネルギーレベル間隔の統計をランダム行列の固有値と結びつけ,中性子散乱スペクトルを説明する.
  • トゥーレスパラメータ (平均幅/間隔比) は,金属・断熱器の移行とアンダーソンの局所化を記述する.

研究 の 目的:

  • 複雑な媒介における波の伝播の包括的なモダルの記述を開発し,スペクトル混雑を克服する.
  • 送信される放射線のスペックルパターンのフィールドを分析するために.
  • 局所的な波の伝達における複雑さを説明し,波/粒子拡散を調和させるため.

主な方法:

  • ランダムに詰め込まれたアルミニウム球体を通して伝達されたマイクロ波場のスペックルパターンの分解.
  • 各モードの中央周波数とライン幅の識別.
  • モダルフィールドのスペックルパターン間の相関の分析.

主要な成果:

  • フィールドスペックルパターンを個々のモードパターンに分解しました.
  • 各モードの中央周波数とライン幅を決定する.

さらに関連する動画

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
18:57

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

関連する実験動画

Last Updated: Jun 3, 2026

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales
12:32

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales

Published on: November 25, 2020

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
18:57

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

  • モダルフィールドのスペックルパターンの間の強い相関が観察され,破壊的な干渉につながった.
  • 局所波の安定状態とパルス伝送の複雑さを説明しました.

    • 結論:

    • モダルの分解は,複雑な媒介における波の伝播に関する包括的な理解を提供します.
    • モード間の破壊的な干渉は,局所的な波伝送の重要な要因です.
    • この研究は,乱雑なシステムにおける拡散の波と粒子の記述を調和させています.