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Published on: June 14, 2013
Harmonic generation by yeast cells in response to low-frequency electric fields
D Nawarathna1, J R Claycomb, G Cardenas
1Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5005, USA.
Summary
Budding yeast cells generate electrical harmonics in response to electric fields. The proton pump (H+-ATPase) activity significantly influences these harmonics, showing dependence on field amplitude and frequency.
Area of Science:
- Biophysics
- Cellular Electrophysiology
- Nonlinear Dynamics
Background:
- Budding yeast (Saccharomyces cerevisiae) possess complex cellular mechanisms.
- Cellular responses to external electric fields are not fully understood.
- Nonlinear phenomena in biological systems are of significant scientific interest.
Purpose of the Study:
- To investigate harmonic generation in yeast cells exposed to sinusoidal electric fields.
- To elucidate the role of the proton pump (H+-ATPase) in cellular harmonic generation.
- To analyze the dependence of harmonic production on electric field parameters and cellular perturbations.
Main Methods:
- Yeast cell suspensions (Saccharomyces cerevisiae) were subjected to controlled sinusoidal electric fields (10-300 Hz, 0-5 V/cm).
- Harmonic generation was measured and analyzed.
- The effects of sodium metavanadate (H+-ATPase inhibitor) and glucose (H+-ATPase substrate) were assessed.
- Cellular responses to membrane depolarizers were also investigated.
Main Results:
- Yeast cells generated electrical harmonics with strong amplitude and frequency dependence.
- H+-ATPase activity modulated harmonic production: increasing it at low amplitudes and decreasing it at high amplitudes.
- Perturbations like inhibitors, substrates, or depolarizers caused significant changes in harmonic characteristics over time.
Conclusions:
- The nonlinear response of the P-type proton pump (H+-ATPase) is a key mechanism for harmonic generation in yeast cells at low frequencies.
- Cellular electrophysiology and metabolic state critically influence the generation of electrical harmonics.
- This study provides insights into the nonlinear electrical behavior of biological cells.
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