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Related Concept Videos

Reynolds Transport Theorem01:24

Reynolds Transport Theorem

The Reynolds transport theorem provides a framework to relate the time rate of change of an extensive property within a system to that in a control volume, which is crucial for analyzing fluid dynamics. Extensive properties, such as mass, velocity, acceleration, temperature, and momentum, can be expressed in terms of the mass of a fluid portion. These properties are called extensive because they depend on the system's size, while intensive properties are their corresponding values per unit mass.
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.
Transport Number01:31

Transport Number

The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
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...

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Related Experiment Video

Updated: May 30, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Mesoscopic transport revisited.

Mukunda P Das1, Frederick Green

  • 1Department of Theoretical Physics, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200, Australia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 6, 2011
PubMed
Summary
This summary is machine-generated.

Nanoelectronics is transitioning from extraordinary to commonplace, requiring advanced predictive modeling for practical applications. Reassessing foundational assumptions in mesoscopic transport is crucial for optimizing this maturing technology.

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

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Related Experiment Videos

Last Updated: May 30, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

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

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

Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Nanoelectronics has driven significant progress in physics.
  • The field is moving towards widespread practical applications.
  • Transitioning from proof-of-concept to functional artifacts presents challenges.

Purpose of the Study:

  • To address the challenge of translating nanoelectronic concepts into practical devices.
  • To highlight the need for advanced predictive modeling in mesoscopic technology.
  • To reassess the foundational assumptions underpinning current mesoscopic transport understanding.

Main Methods:

  • Overview of underlying assumptions in mesoscopic transport.
  • Analysis of current state-of-the-field assumptions.
  • Discussion on the requirements for optimizing mesoscopic technology.

Main Results:

  • Identification of key assumptions in mesoscopic transport.
  • Highlighting the gap between current understanding and practical needs.
  • Emphasis on the role of predictive modeling.

Conclusions:

  • Optimizing mesoscopic technology requires a reassessment of fundamental assumptions.
  • Advanced predictive modeling is essential for the maturation of nanoelectronics.
  • Bridging the gap between concept and artifact necessitates a deeper understanding of mesoscopic transport.