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Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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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.
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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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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
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Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
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Feedback-controlled solute transport through chemo-responsive polymer membranes.

Sebastian Milster1, Won Kyu Kim2, Joachim Dzubiella1

  • 1Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany.

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This study reveals that responsive polymer membranes can exhibit tunable, nonlinear transport behaviors. Membrane feedback significantly alters solute flux, offering potential for advanced self-regulating membrane devices.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Polymer membranes are often modeled as inert, neglecting particle flux and density effects.
  • Understanding membrane behavior under varying transport conditions is crucial for advanced applications.

Purpose of the Study:

  • To theoretically investigate the impact of membrane responsiveness and feedback on transport properties.
  • To analyze steady-state force-flux relations and permeability using a nonlinear-feedback model.

Main Methods:

  • Developed a nonlinear-feedback solution-diffusion model for transport through slab-like membranes.
  • Investigated solute concentration effects on polymer volume phase transitions and permeability.
  • Quantified nonlinear force-flux relations and differential permeability (PsysΔ).

Main Results:

  • Membrane feedback can modulate solute flux by orders of magnitude.
  • Flux modulation is tunable by solute-membrane interactions and sensitive to small changes in driving force.
  • Observed steady-state bistability and hysteresis in force-flux relations controllable by input parameters (c0, f).

Conclusions:

  • Membrane chemo-responsiveness offers significant nonlinear transport control.
  • Fine-tuning responsiveness enhances control features for future self-regulating membrane devices.
  • Highlights the potential of responsive membranes in advanced separation and filtration technologies.