THE ACTION OF SHORT RADIO WAVES ON TISSUES III. A COMPARISON OF THE THERMAL SENSITIVITIES OF TRANSPLANTABLE TUMOURS IN VIVO AND IN VITRO
HERBERT J. JOHNSON · 1940
1940 research compared tumor responses to radio wave heating in living animals versus lab conditions.
Plain English Summary
This 1940 study compared how transplanted tumors responded to heat generated by short radio waves, testing both tumors grown in living animals versus laboratory conditions. Researchers used thermocouples to measure tissue heating and examine whether radio wave-induced thermal effects affected tumor sensitivity differently in these two environments.
Why This Matters
This research represents some of the earliest scientific investigation into how radio frequency energy interacts with living tissue, predating our modern understanding of non-thermal EMF effects by decades. While the study focused on deliberate heating for potential cancer treatment, it established fundamental principles about how electromagnetic fields transfer energy into biological systems. The comparison between living tissue and laboratory conditions was particularly prescient, as we now know that cellular responses to EMF can vary dramatically between isolated cells and complex living organisms. What makes this work especially relevant today is that it demonstrates scientists were already documenting biological effects from radio waves in 1940, yet we're still debating EMF safety nearly a century later. The thermal sensitivity differences this study likely found between living and laboratory conditions mirror current debates about whether lab studies adequately predict real-world EMF health effects.
Figures from the Original Paper
Diagram extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To establish a reliable means of measuring the heat produced by short radio waves in transplantable tumour tissues and to determine the thermal death times of these in vivo, at temperatures compatible with the survival of the host, while comparing with in vitro thermal sensitivities.
Transplanted tumours were exposed to short radio waves using a transmitter with critical tuning arra...
In vivo Walker rat carcinoma 256 appears to be more resistant to heat at the temperatures investigat...
The study demonstrates that accurate thermal measurements are the best means of determining the effectiveness or dosage of short radio waves. The thermal death times of tumours in vivo differ from those in vitro, with in vivo tumours showing greater resistance to heat at the investigated temperatures.
Show BibTeX
@article{the_action_of_short_radio_waves_on_tissues_iii_a_comparison_of_the_thermal_sensi_g7300,
author = {HERBERT J. JOHNSON},
title = {THE ACTION OF SHORT RADIO WAVES ON TISSUES III. A COMPARISON OF THE THERMAL SENSITIVITIES OF TRANSPLANTABLE TUMOURS IN VIVO AND IN VITRO},
year = {1940},
}