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

DNA & Genetic Damage

Genome-wide transcription analysis of Escherichia coli in response to extremely low-frequency magnetic fields

No Effects Found

Authors not listed · 2012

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E. coli bacteria showed zero gene expression changes when exposed to power line frequency magnetic fields 10,000 times stronger than typical home exposures.

Plain English Summary

Summary written for general audiences

Scientists exposed E. coli bacteria to 50 Hz magnetic fields (the same frequency as European power lines) at 1 mT strength for up to 15 hours. They found no changes in bacterial growth, survival, or gene expression across 4,358 genes tested. This suggests power line frequency magnetic fields don't affect basic cellular processes in this bacterial model.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale
Cite This Study
Unknown (2012). Genome-wide transcription analysis of Escherichia coli in response to extremely low-frequency magnetic fields.
Show BibTeX
@article{genome_wide_transcription_analysis_of_escherichia_coli_in_response_to_extremely_low_frequency_magnetic_fields_ce4052,
  author = {Unknown},
  title = {Genome-wide transcription analysis of Escherichia coli in response to extremely low-frequency magnetic fields},
  year = {2012},
  doi = {10.1002/bem.21709},
  
}
DOI: 10.1002/bem.21709PubMed: 22331529

Quick Questions About This Study

No, researchers found no statistically significant changes in gene expression across 4,358 genes when E. coli bacteria were exposed to 50 Hz magnetic fields at 1 mT strength for up to 15 hours.
The 1 mT field strength is extremely high compared to everyday exposures - approximately 10,000 times stronger than typical magnetic fields from power lines or household appliances in your home environment.
No, the study found that 50 Hz magnetic fields at 1 mT had no effect on E. coli growth rates, optical density measurements, or the number of viable bacterial cells.
This study used genome-wide microarray analysis to examine over 4,000 genes simultaneously, providing a comprehensive view of cellular response rather than looking at just selected biological markers or pathways.
No, even brief 8-minute exposures to 50 Hz magnetic fields showed no reliable changes in E. coli transcription or growth, similar to the longer exposure periods tested.