Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Effect of Microwaves on Escherichia coli and Bacillus subtilis
Samuel A. Goldblith, Daniel I. C. Wang · 1967
Microwave radiation at 2,450 MHz kills bacteria purely through heating, not electromagnetic effects.
Plain English Summary
Researchers exposed E. coli bacteria and B. subtilis spores to 2,450 MHz microwave radiation and compared their death rates to conventional heating. They found that microwaves killed the microorganisms at exactly the same rate as regular heat at the same temperature. This suggests microwaves work purely through heating effects, not through any special electromagnetic properties.
Why This Matters
This 1967 study provides important context for understanding how microwaves affect biological systems. The finding that 2,450 MHz radiation killed bacteria solely through thermal effects, not electromagnetic mechanisms, helps explain why your microwave oven works so effectively at heating food. The frequency tested is identical to what your kitchen microwave uses today. While this research focused on microorganisms rather than human cells, it demonstrates a fundamental principle: at the power levels used in microwave ovens, the biological effects come from heat generation, not from the electromagnetic fields themselves. This thermal mechanism is well-established science and differs significantly from the non-thermal effects that researchers study with much lower-power EMF exposures from devices like cell phones and WiFi routers.
Figures from the Original Paper
Diagrams extracted from the original research document.
Show BibTeX
@article{effect_of_microwaves_on_escherichia_coli_and_bacillus_subtilis_g7043,
author = {Samuel A. Goldblith and Daniel I. C. Wang},
title = {Effect of Microwaves on Escherichia coli and Bacillus subtilis},
year = {1967},
}