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Related Concept Videos

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.
Nonlinear Pharmacokinetics: Role of Transporters01:27

Nonlinear Pharmacokinetics: Role of Transporters

A drug's nonlinear kinetics can be influenced by a diverse range of transporter proteins that serve as crucial players in drug distribution. These transporters, found within cells, can enhance or reduce local drug concentrations by facilitating the influx or efflux of drugs. For instance, the expression of xenobiotic transporters can be influenced by factors such as age and gender, potentially impacting the linearity of drug response.
Polymorphisms occurring in drug transporters can alter...
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...
Secondary Active Transport01:32

Secondary Active Transport

One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
Secondary Active Transport01:55

Secondary Active Transport

One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...

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Related Experiment Video

Updated: Jun 5, 2026

Optimizing Visualization of Axonal Transport of Endogenous Cargo by Fluorescence Microscopy in Living Caenorhabditis elegans
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Published on: February 16, 2024

Anomalous physical transport in complex networks.

Christos Nicolaides1, Luis Cueto-Felgueroso, Ruben Juanes

  • 1Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 48-319, Cambridge, Massachusetts 02139, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Transport in complex networks exhibits scaling due to network topology and dynamics. This study reveals power-law scaling in velocity distributions and anomalous scaling in particle displacement, linking network structure to transport behavior.

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Area of Science:

  • Complex systems
  • Network science
  • Statistical physics

Background:

  • Transport phenomena in interconnected systems are influenced by network topology and underlying physical dynamics.
  • Understanding scaling behaviors is crucial for characterizing transport efficiency and predictability.

Purpose of the Study:

  • To investigate transport dynamics (advection and diffusion) in scale-free and Erdős-Rényi networks.
  • To analyze the relationship between network connectivity, velocity distributions, and particle displacement scaling.
  • To connect observed transport behaviors with existing theories of anomalous transport in disordered systems.

Main Methods:

  • Derivation of velocity distributions from a flow potential.
  • Stochastic particle simulations to model transport.
  • Analysis of power-law scaling in velocity and mean-square displacement.

Main Results:

  • Velocity distributions exhibit power-law scaling with an exponent related to network connectivity (ν≈γ+1).
  • Particle simulations reveal anomalous (nonlinear) scaling of mean-square displacement over time.
  • Transport behavior is explained by the interplay between particle jump lengths and transition times.

Conclusions:

  • Network topology significantly dictates scaling in transport phenomena.
  • Anomalous transport scaling is a key characteristic in these complex networks.
  • The coupled nature of particle dynamics provides a framework for understanding emergent transport properties.