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Diffusion01:12

Diffusion

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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 plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Effective diffusivity of microswimmers in a crowded environment.

Marvin Brun-Cosme-Bruny1, Eric Bertin1, Benoît Coasne1

  • 1University of Grenoble Alpes, CNRS, LIPhy, F-38000 Grenoble, France.

The Journal of Chemical Physics
|March 17, 2019
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Summary
This summary is machine-generated.

Microalgae swimming behavior in complex environments was studied using a model system. Increased pillar density in the microalgae

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Area of Science:

  • Microbiology
  • Biophysics
  • Soft Matter Physics

Background:

  • Microorganisms like Chlamydomonas Reinhardtii exhibit complex swimming patterns.
  • Understanding microswimmer behavior in structured environments is crucial for various applications.
  • The run-and-tumble model describes microbial motility as a persistent random walk.

Purpose of the Study:

  • To investigate the impact of complex, pillar-filled environments on microalgae swimming.
  • To analyze how microfabrication-generated lattices affect microswimmer trajectories and dynamics.
  • To quantify the relationship between environmental complexity and microswimmer motion statistics.

Main Methods:

  • Utilized Chlamydomonas Reinhardtii as a model micro-organism.
  • Employed soft lithography to create regular pillar lattices as the complex medium.
  • Tracked and analyzed individual cell trajectories within the microfabricated pillar environments.
  • Measured statistical observables such as mean correlation time and effective diffusion coefficient.

Main Results:

  • Observed a decrease in the mean correlation time of direction with increasing pillar density.
  • Found that the effective diffusion coefficient also decreases as pillar density increases.
  • Demonstrated that the complex medium significantly alters microswimmer dynamics.

Conclusions:

  • Microalgae swimming is effectively modified by structured, complex environments.
  • Pillar density is a key factor influencing microswimmer diffusion and directional persistence.
  • Findings offer insights into the behavior of active matter in heterogeneous surroundings.