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Related Concept Videos

Transition State Theory01:25

Transition State Theory

Transition-state theory, also known as activated-complex theory, provides a molecular-level explanation of reaction rates in both gas-phase and solution-phase reactions. It extends earlier kinetic models by considering the formation of a short-lived, high-energy configuration during a reaction.The progress of a chemical reaction can be represented using a reaction profile, which plots potential energy against the reaction coordinate. As two reactant molecules approach one another, their...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Membrane Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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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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Introduction to Solid Supported Membrane Based Electrophysiology
19:56

Introduction to Solid Supported Membrane Based Electrophysiology

Published on: May 11, 2013

Adaptive transition rates in excitable membranes.

Shimon Marom1

  • 1Department of Physiology in the Faculty of Medicine and the Network Biology Research Laboratories, Technion - Israel Institute of Technology Haifa, Israel. marom@technion.ac.il

Frontiers in Computational Neuroscience
|February 20, 2009
PubMed
Summary

This study reinterprets cellular adaptation in excitable membranes using population dynamics. It reveals a simple logistic-like equation governing ion channel kinetics, offering a new perspective on cellular adaptation mechanisms.

Keywords:
adaptationcomplex adaptationexcitabilitygraceful adaptationinactivationionic channellogistic equationpopulation dynamics

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Area of Science:

  • Computational neuroscience
  • Biophysics
  • Systems biology

Background:

  • Excitable membranes exhibit adaptation over diverse timescales.
  • Current models often use complex multi-state systems for ion channel kinetics.

Purpose of the Study:

  • To present a novel approach to understanding adaptation in excitable membranes.
  • To model ion channel kinetics using population dynamics.

Main Methods:

  • Interpreting ion channel kinetics through population dynamics.
  • Developing a logistic-like equation for adaptation.
  • Analyzing feedback loops and adaptive transition rates.

Main Results:

  • Adaptation in excitable membranes can be described by a simplified logistic-like equation.
  • A feedback loop involving activation history and adaptive transition rates is identified.
  • A single, physiologically measurable dimension of inactive states modulates system stability and input-output relations.

Conclusions:

  • Cellular adaptation in excitable membranes emerges from microscopic biophysical properties.
  • This model provides a scale-free mechanism for cellular adaptation.
  • The findings offer a complementary perspective to traditional multi-state models of ion channel kinetics.