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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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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Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
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Restricted diffusion in annular geometrical pores.

Bahman Ghadirian1, Allan M Torres, Nirbhay N Yadav

  • 1Nanoscale Organisation and Dynamics Group, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia.

The Journal of Chemical Physics
|March 15, 2013
PubMed
Summary
This summary is machine-generated.

New models improve nuclear magnetic resonance (NMR) diffusion analysis for biological systems by accurately simulating complex cellular shapes. This enhances the precision of diffusion MRI experiments and provides better diffusion coefficient measurements.

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Area of Science:

  • Physics
  • Biophysics
  • Materials Science

Background:

  • Nuclear magnetic resonance (NMR) diffusion experiments rely heavily on analytical models.
  • Current models inadequately represent complex biological cellular shapes, limiting experimental accuracy.
  • Improved models are needed for precise analysis of diffusion MRI data in biological systems.

Purpose of the Study:

  • To develop novel analytical models for diffusion within complex geometries relevant to biological systems.
  • To derive diffusion propagators and pulsed gradient spin-echo attenuation equations for annular regions of cylinders and spheres.
  • To investigate the impact of boundary relaxation and arbitrary orientation on diffusion measurements.

Main Methods:

  • Derivation of diffusion propagators and attenuation equations in the short gradient pulse limit.
  • Modeling diffusion in the annular region of concentric cylinders and spheres.
  • Inclusion of boundary relaxation and arbitrary cylinder orientation relative to the field gradient.

Main Results:

  • Novel analytical models for diffusion in finite-length concentric cylinders and concentric spheres.
  • Expressions for mean square displacements derived for complex geometries.
  • Consideration of limiting cases, including diffusion on cylindrical and spherical shells and in a ring.

Conclusions:

  • The developed models offer a more accurate representation of diffusion in complex biological structures compared to existing approximations.
  • These models enhance the capability of nuclear magnetic resonance (NMR) diffusion techniques, including diffusion MRI.
  • The derived expressions for mean square displacements are crucial for determining accurate diffusion coefficients in intricate geometries.