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相关概念视频

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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相关实验视频

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

通过随机介质中的模式进行传输.

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
概括

分析了复杂的媒介激发,如量子水平和经典模式. 研究人员分解了微波场的斑点图案,揭示了破坏性干扰和协调波和粒子扩散描述.

科学领域:

  • 在复杂和无序的介质中波浪的传播.
  • 量子混沌和随机矩阵理论.
  • 统计力学和凝聚物质物理学.

背景情况:

  • 复杂系统中的激发是自身状态 (级别/模式) 的叠加.
  • 维格纳推测将能量水平间隔统计与随机矩阵固有值联系起来,解释中子散射光谱.
  • 图勒斯的参数 (平均宽度/间距比) 描述了金属绝缘体过渡和安德森定位.

研究的目的:

  • 在复杂的介质中开发波传播的综合模式描述,克服光谱拥堵.
  • 为了分析传输辐射的光斑场图案.
  • 解释局部波的传输复杂性和调和波/粒子扩散.

主要方法:

  • 微波场斑点图案的分解通过随机包装的球传递.
  • 确定各个模式的中心频率和线路宽度.
  • 模态场斑点模式之间的相关性分析.

主要成果:

  • 成功地将现场斑点模式分解成个别模式模式.
  • 确定每个模式的中心频率和线宽.
  • 观察到模态场斑点模式之间的强相关性,导致破坏性干扰.
  • 解释了局部波的稳定状态和脉冲传输复杂性.

更多相关视频

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

相关实验视频

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

结论:

  • 模态分解为复杂介质中的波传播提供了全面的理解.
  • 模式之间的破坏性干扰是局部波传输的关键因素.
  • 这项工作协调了波和粒子在无序系统中扩散的描述.