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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Whole Body / General

Search for Millimeter Microwave Effects on Enzyme or Protein Functions

No Effects Found

P. Tuengler, F. Keilmann, L. Genzel · 1979

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Millimeter waves showed no effect on enzyme function at 50x typical 5G exposure levels.

Plain English Summary

Summary written for general audiences

German researchers exposed enzyme solutions and hemoglobin to millimeter wave radiation (40-115 GHz) at 10 mW/cm² to test for biological effects. They found no detectable changes in enzyme activity or oxygen binding, even with precise frequency scanning. This suggests millimeter waves at these intensities don't directly interfere with basic protein functions.

Cite This Study
P. Tuengler, F. Keilmann, L. Genzel (1979). Search for Millimeter Microwave Effects on Enzyme or Protein Functions.
Show BibTeX
@article{search_for_millimeter_microwave_effects_on_enzyme_or_protein_functions_g5206,
  author = {P. Tuengler and F. Keilmann and L. Genzel},
  title = {Search for Millimeter Microwave Effects on Enzyme or Protein Functions},
  year = {1979},
  
  
}

Quick Questions About This Study

Researchers continuously scanned from 40 to 115 GHz with resolution of a few MHz. This covers frequencies used in modern 5G networks and beyond, providing comprehensive testing across the millimeter wave spectrum.
The study used 10 mW/cm², approximately 50 times stronger than typical 5G tower exposures. This high intensity makes the lack of biological effects more significant for real-world exposure assessments.
Researchers tested alcohol dehydrogenase (which processes ethanol) and hemoglobin's oxygen binding. These represent fundamental biological processes, making them good indicators of potential millimeter wave interference with protein function.
The experimental setup could detect changes as small as 0.1% in enzyme reaction rates or oxygen binding. This high sensitivity means even subtle millimeter wave effects would have been detected.
Continuous frequency scanning with MHz resolution was used to catch any resonant biological responses that might occur only at specific frequencies, ensuring no narrow-band effects were missed.