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Nonlinear pulses at the interface and its relation to state and temperature
Kevin H Kang1, Matthias F Schneider2
1Department of Physics, Technical University of Dortmund, Dortmund, Germany.
The European Physical Journal. E, Soft Matter
|February 5, 2020
Summary
Environmental temperature influences biological pulse velocity and excitability by altering the membrane
Area of Science:
- Biophysics
- Physical Chemistry
- Cell Biology
Background:
- Environmental temperature significantly impacts the pulse velocity and excitability of biological systems.
- A physical hydrodynamic model suggests the thermodynamic state of the hydrated interface governs pulse behavior.
Purpose of the Study:
- To investigate the hypothesis that environmental temperature affects biological pulse dynamics by altering the interface's thermodynamic state.
- To correlate membrane phase transitions with nonlinear acoustic pulse properties.
Main Methods:
- Measurement of temperature-dependent phase diagrams for a lipid monolayer.
- Excitation and characterization of nonlinear acoustic pulses along the membrane.
- Analysis of membrane compressibility and pulse velocity as a function of temperature.
Main Results:
- Lipid monolayers in the fluid-gel transition regime showed decreased compressibility (increased stiffness) with rising temperature.
- Nonlinear acoustic pulse velocity increased with temperature near the transition state, correlating with compressibility changes.
- Excitability was significantly reduced or abolished when the system moved away from the transition regime.
Conclusions:
- The thermodynamic state of the interface and its phase transitions are critical for understanding pulse propagation in excitable systems.
- Findings support the hypothesis that temperature-induced changes in membrane thermodynamic state underlie observed pulse behavior in biological systems.
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