Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Studies on the Effect of Radio-Frequency Waves on Biological Macromolecules
Shiro Takashima · 1966
1966 research found no DNA or enzyme damage from 1-60 MHz radio frequencies, but tested limited biological endpoints.
Plain English Summary
This 1966 study examined whether radio-frequency electric fields between 1 and 60 MHz could damage biological molecules like DNA and enzymes. Using pulsed fields and cooling to avoid heating effects, researchers found no changes to the structure of DNA or the activity of alcohol dehydrogenase enzyme even after prolonged high-intensity exposure.
Why This Matters
This early study represents important foundational research in EMF biology, though its findings must be viewed in context. While the researchers found no effects on DNA structure or enzyme function at frequencies up to 60 MHz, this work predates our understanding of non-thermal biological mechanisms and was limited to just two biological targets. The frequency range tested (1-60 MHz) sits below modern cell phone frequencies (800-2700 MHz) but overlaps with FM radio and some wireless communications. What's significant is the researchers' careful attention to avoiding thermal effects through pulsed exposure and cooling, recognizing even in 1966 that heat could confound results. However, we now know that biological effects can occur through mechanisms beyond simple molecular damage, including changes in cellular signaling, membrane permeability, and calcium channel function that weren't measured in this study.
Finding
The activity of alcohol dehydrogenase and the structure of DNA were not altered, however, even by the prolonged irradiation at high-field intensity between 1 and about 60 Mc/s.
In their words
“The activity of alcohol dehydrogenase and the structure of DNA were not altered, however, even by the prolonged irradiation at high-field intensity between 1 and about 60 Mc/s.”
Figures from the Original Paper
Diagrams extracted from the original research document.
Show BibTeX
@article{studies_on_the_effect_of_radio_frequency_waves_on_biological_macromolecules_g5688,
author = {Shiro Takashima},
title = {Studies on the Effect of Radio-Frequency Waves on Biological Macromolecules},
year = {1966},
}