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The role of coherence time in the effect of microwaves on ornithine decarboxylase activity
Author(s) -
Litovitz T. A.,
Krause D.,
Penafiel Miguel,
Elson Edward C.,
Mullins J. M.
Publication year - 1993
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.2250140502
Subject(s) - ornithine decarboxylase , microwave , amplitude , coherence (philosophical gambling strategy) , physics , chemistry , nuclear magnetic resonance , magnetic field , biophysics , optics , enzyme , biology , quantum mechanics
Previously, we demonstrated the requirement for a minimum coherence time of an applied, small amplitude (10 μT) ELF magnetic field if the field were to produce an enhancement of ornithine decarboxylase activity in L929 fibroblasts. Further investigation has revealed a remarkably similar coherence time phenomenon for enhancement of ornithine decarboxylase activity by amplitude‐modulated 915 MHz microwaves of large amplitude (SAR 2.5 W/kg). Microwave fields modulated at 55, 60, or 65 Hz approximately doubled ornithine decarboxylase activity after 8 h. Switching modulation frequencies from 55 to 65 Hz at coherence times of 1.0 s or less abolished enhancement, while times of 10 s or longer provided full enhancement. Our results show that the microwave coherence effects are remarkably similar to those observed with ELF fields. © 1993 Wiley‐Liss. Inc.