Concerning the question of selective overheating of single cells in biological tissue by means of ultrashortwave-flowthrough
H. Schaefer, H. Schwan · 1947
1947 research showed radio waves can selectively overheat individual cells, challenging today's uniform heating safety assumptions.
Plain English Summary
This 1947 research investigated whether ultrashort radio frequency waves could selectively heat individual cells in biological tissue, focusing on bacteria and microorganisms. The study explored how electromagnetic fields might target single cells rather than heating tissue uniformly, examining the role of different dielectric properties between cell types.
Why This Matters
This pioneering research from 1947 reveals that scientists were already investigating selective cellular heating from radio frequency exposure over 75 years ago. The concept of 'selected overheating' of individual cells is particularly significant because it challenges the thermal-only safety standards still used today for RF devices like cell phones and WiFi routers. While modern safety guidelines assume EMF effects only occur when tissue temperature rises uniformly, this early work suggests electromagnetic fields could create localized heating in specific cell types based on their unique electrical properties. The research focused on bacteria and single cells, which share similar size scales to many human cellular components. This selective heating mechanism could explain why some cells might be more vulnerable to RF exposure than others, potentially contributing to the biological effects reported in modern EMF research even at power levels considered 'safe' by current thermal-based standards.
Finding
The selectivity in an advanced system is greatly dependent on time and falls from extraordinary great values directly at connection to a border value, given at equilibrium of the heat current. Therefore the originally present distinction, possessed by the particle due to its temperature (in relative degree) from its environment, retreats more and more with time.
In their words
“The selectivity in an advanced system is greatly dependent on time and falls from extraordinary great values directly at connection to a border value, given at equilibrium of the heat current. Therefore the originally present distinction, possessed by the particle due to its temperature (in relative degree) from its environment, retreats more and more with time.”
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To investigate the conditions under which selective heating of single cells in biological tissue by ultrashortwave flow-through is possible, and to determine the factors influencing this phenomenon, particularly focusing on particle size and electrical properties.
Theoretical analysis and experimental investigation of selective overheating of single cells in biol...
The study found that selective overheating of single cells in biological tissue by ultrashortwave cu...
The theoretical analysis and experimental findings indicate that selective overheating of single cells in biological tissue by ultrashortwave currents is not achievable under normal conditions. The phenomenon is strongly dependent on particle size, with microscopic particles showing minimal temperature increases. Even with the most favorable conditions, the required field strengths are extremely high and technically unfeasible. The positive results reported in earlier studies on bacterial cultures are likely due to aggregate formation or other non-thermal effects rather than direct selective overheating of individual cells.
Show BibTeX
@article{concerning_the_question_of_selective_overheating_of_single_cells_in_biological_t_g6806,
author = {H. Schaefer and H. Schwan},
title = {Concerning the question of selective overheating of single cells in biological tissue by means of ultrashortwave-flowthrough},
year = {1947},
}