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Effect of High-Frequency Fields on Micro-Organisms

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Hugh Fleming · 1944

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1944 research confirmed high-frequency electromagnetic fields affect microorganisms, establishing early evidence of biological EMF effects.

Plain English Summary

Summary written for general audiences

This 1944 study by Fleming examined how high-frequency electromagnetic fields affect microorganisms like bacteria. The research investigated biological effects of RF fields on microbes, likely in connection with medical diathermy treatments. This represents early scientific inquiry into how electromagnetic energy interacts with living organisms at the cellular level.

Why This Matters

Fleming's 1944 research represents a fascinating piece of early EMF science, conducted when diathermy machines were becoming common medical tools. The fact that researchers were already documenting electromagnetic effects on microorganisms eight decades ago underscores how long we've known that RF fields can influence biological systems. What makes this particularly relevant today is that the high-frequency fields Fleming studied share characteristics with modern wireless technologies. While diathermy machines operate at much higher power levels than your phone or WiFi router, the fundamental physics of how RF energy interacts with living cells remains the same. This early work helped establish that electromagnetic fields aren't biologically inert - they can and do affect living organisms, even at the microscopic level.

Figures from the Original Paper

Diagrams extracted from the original research document.

diagramPage 2 - Figure 1. Schematic diagram of a vacuum-tube oscillator for 90-centimeter waves
p. 2 of the original PDF
chartPage 3 - AI-described figure: Figure 4. Effect of Frequency on Escherichia coli: A chart showing the percentage of nonviable organisms per cubic centimeter at different frequencies in megacycles.
p. 3 of the original PDF
chartPage 4 - AI-described figure: Figure 7. Time of treatment of Escherichia coli showing a graph plotting percentage of nonmovable bacteria against time in minutes.
p. 4 of the original PDF

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 14-60 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 14-60 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. Duration: one minute

Study Details

To investigate the effects of high-frequency fields on micro-organisms, particularly focusing on immobilizing and lethal effects of high-frequency currents on bacteria such as Escherichia coli, and to correlate electrical data with medical and bacteriological findings.

Laboratory analysis using variable-frequency tests, variable-voltage and current tests, time-variabl...

All frequencies tested had somewhat of a lethal effect upon the Escherichia coli. This effect became...

The experimental work demonstrated trends in the immobilizing effect of the variables listed. Germicidal results were easy to obtain even with small amounts of power, suggesting that sterilization by means of exposure to high-frequency fields is warranted economically. The best frequency to use for treating a given micro-organism depends upon the size of that organism, with the bactericidal range roughly assigned to the 1-20 meter band. It is possible that additional lethal effects might be experienced in the ultrahigh frequency range, but control is difficult when treating large masses of organic matter.

Cite This Study
Hugh Fleming (1944). Effect of High-Frequency Fields on Micro-Organisms.
Show BibTeX
@article{effect_of_high_frequency_fields_on_micro_organisms_g3899,
  author = {Hugh Fleming},
  title = {Effect of High-Frequency Fields on Micro-Organisms},
  year = {1944},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Fleming studied bacteria and other microorganisms exposed to high-frequency electromagnetic fields. The research focused on understanding how RF energy affects these microscopic life forms, likely including common bacterial strains used in laboratory research during the 1940s.
Fleming's diathermy research used high-frequency fields similar in principle to modern wireless technologies. While medical diathermy operates at much higher power levels, the basic physics of RF interaction with biological tissue remains relevant to understanding today's EMF exposures.
Scientists were investigating biological effects of diathermy machines used in medical treatments. Understanding how high-frequency fields affected microorganisms helped researchers better comprehend the mechanisms behind electromagnetic therapy and potential biological interactions with RF energy.
This research represents early scientific recognition that electromagnetic fields can affect living organisms. It established foundational evidence that RF energy isn't biologically neutral, contributing to our understanding of electromagnetic bioeffects decades before modern wireless technology emerged.
Yes, Fleming's 1944 work demonstrates scientists already recognized electromagnetic fields could influence biological systems. This early research on microorganisms helped establish that RF energy produces measurable effects on living cells, contradicting claims that EMF bioeffects are recent discoveries.