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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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Updated: Jun 3, 2026

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales
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Published on: November 25, 2020

El transporte a través de modos en medios aleatorios.

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
Resumen

Se analizaron excitaciones de medios complejos, como los niveles cuánticos y los modos clásicos. Los investigadores descompusieron los patrones de manchas del campo de microondas, revelando interferencias destructivas y armonizando las descripciones de difusión de ondas y partículas.

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Área de la Ciencia:

  • Propagación de ondas en medios complejos y desordenados.
  • El caos cuántico y la teoría de matrices aleatorias.
  • Mecánica estadística y física de la materia condensada.

Sus antecedentes:

  • Las excitaciones en sistemas complejos son superposiciones de estados propios (niveles/modos).
  • La conjetura de Wigner vincula las estadísticas de espaciado del nivel de energía con los valores propios de la matriz aleatoria, explicando los espectros de dispersión de neutrones.
  • El parámetro de Thouless (relación de ancho/espaciado promedio) describe las transiciones metal-aislador y la localización de Anderson.

Objetivo del estudio:

  • Desarrollar una descripción modal completa de la propagación de ondas en medios complejos, superando la congestión espectral.
  • Para analizar el patrón de manchas de campo de la radiación transmitida.
  • Para explicar las complejidades en la transmisión de ondas localizadas y conciliar la difusión onda/partícula.

Principales métodos:

  • Descomposición de patrones de manchas de campo de microondas transmitidos a través de esferas de alumina empacadas al azar.
  • Identificación de la frecuencia central y ancho de línea para los modos individuales.
  • Análisis de las correlaciones entre los patrones de manchas de campo modal.

Principales resultados:

  • Descompuso con éxito los patrones de manchas de campo en patrones de modo individuales.
  • Determinada frecuencia central y ancho de línea para cada modo.
  • Se observaron fuertes correlaciones entre los patrones de manchas del campo modal, lo que lleva a interferencias destructivas.
  • Explicó las complejidades de transmisión en estado estacionario y pulsado de ondas localizadas.

Conclusiones:

  • La descomposición modal proporciona una comprensión completa de la propagación de ondas en medios complejos.
  • La interferencia destructiva entre modos es un factor clave en la transmisión de ondas localizadas.
  • Este trabajo armoniza las descripciones de ondas y partículas de difusión en sistemas desordenados.