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The role of temporal sensing in bioelectromagnetic effects
T A Litovitz1, M Penafiel, D Krause
1Department of Physics, Catholic University of America, Washington, DC 20064, USA.
Bioelectromagnetics
|January 1, 1997
Summary
Cellular response to electromagnetic fields depends on temporal sensing. Cells detect changes in fields over approximately 10 seconds, not just field coherence, indicating a temporal sensing mechanism.
Area of Science:
- Cell Biology
- Biophysics
- Electromagnetism
Background:
- Cellular responses to electromagnetic (EM) fields are not fully understood.
- Temporal sensing mechanisms in cells are being investigated for EM field detection.
Purpose of the Study:
- To investigate if cellular responses to EM fields involve temporal sensing.
- To determine the time constants critical for cellular detection of EM field changes.
Main Methods:
- L929 cells exposed to 60 Hz magnetic fields.
- Measurement of ornithine decarboxylase (ODC) activity as a cellular response indicator.
- Varying field on/off intervals and interruption durations to assess temporal detection.
Main Results:
- Constant field intervals greater than 10 seconds enhanced ODC activity by ~1.7 times.
- Field interruptions of 100 ms or longer were detected by cells, eliminating ODC enhancement.
- Two time constants, approximately 0.1 s (averaging) and 10 s (memory), were identified for cellular EM field detection.
Conclusions:
- Cellular response to EM fields relies on the duration of constant field parameters, not just coherence.
- A temporal sensing mechanism, analogous to bacterial chemotaxis, is proposed for cellular EM field detection.
- Cells appear to average EM field information over ~0.1 s and respond to sustained changes over ~10 s.