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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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The Diffusion of Passive Tracers in Laminar Shear Flow
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Rapid Fickian Yet Non-Gaussian Diffusion after Subdiffusion.

Raffaele Pastore1, Antonio Ciarlo2, Giuseppe Pesce2

  • 1Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, Napoli 80125, Italy.

Physical Review Letters
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

Fickian yet non-Gaussian diffusion (FnGD) can emerge from subdiffusion. Increased optical force strengthens FnGD

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Area of Science:

  • Colloidal science
  • Soft matter physics
  • Statistical mechanics

Background:

  • Fickian yet non-Gaussian diffusion (FnGD) is a recently discovered phenomenon.
  • Understanding the origins and characteristics of FnGD is crucial for various scientific fields.

Purpose of the Study:

  • To investigate the relationship between subdiffusion and FnGD.
  • To explore the influence of optical forces on diffusion regimes.
  • To elucidate the memory effects in diffusion processes.

Main Methods:

  • Utilizing a quasi-2D suspension of colloidal beads.
  • Applying a static and spatially random optical force field.
  • Analyzing diffusion over a wide range of probabilities and timescales.

Main Results:

  • Demonstrated that a rapid FnGD regime can originate from earlier subdiffusion.
  • Showed that subdiffusion and FnGD are intricately linked.
  • Observed that increased optical force leads to deeper subdiffusion and more pronounced FnGD deviations.
  • Found that exponential tails of FnGD develop rapidly within the subdiffusive regime.

Conclusions:

  • FnGD may generally represent a memory effect of preceding subdiffusive processes.
  • The study provides new insights into previously observed experimental phenomena.
  • Highlights the interconnectedness of different diffusion regimes under external forces.