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Related Concept Videos

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Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Surface Tension
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Exchange Controls Coarsening of Surface Condensates.

Riccardo Rossetto1,2, Marcel Ernst1,2, David Zwicker1

  • 1Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany.

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Cells control protein patterns on biological membranes. This study shows how material exchange affects these surface condensates, revealing that active processes can arrest pattern coarsening and create complex structures.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Physical Chemistry

Background:

  • Biological membranes display heterogeneous protein patterns, crucial for cellular functions.
  • Strong patterns, such as polarity spots in yeast, form surface condensates driven by molecular interactions.
  • The impact of these interactions on material exchange with the cellular bulk remains poorly understood.

Purpose of the Study:

  • To investigate how physical interactions within surface condensates influence material exchange with the cellular bulk.
  • To model and understand the dynamics of pattern formation and coarsening in biological membranes.

Main Methods:

  • Analysis of a thermodynamically consistent theoretical model.
  • Mathematical modeling of nonlocal transport via diffusion through the bulk.

Main Results:

  • Passive material exchange generally accelerates the coarsening of surface condensates.
  • Active exchange can further accelerate coarsening or completely arrest it.
  • Active exchange can induce complex patterns across multiple length scales.

Conclusions:

  • Material exchange dynamics significantly impact the stability and morphology of surface condensates.
  • Nonlocal transport mechanisms explain observed scaling laws and provide insights into biological pattern formation.
  • The findings offer a framework for interpreting biologically relevant scenarios of membrane organization.