Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
14.6 mT ELF magnetic field exposure yields no DNA breaks in model system Salmonella, but provides evidence of heat stress protection
No Effects Found
Authors not listed · 2006
Strong magnetic fields caused no DNA damage in bacteria but unexpectedly protected cells from heat stress.
Plain English Summary
Summary written for general audiences
Researchers exposed Salmonella bacteria to strong 60 Hz magnetic fields (14.6 mT) for 4 hours and found no DNA damage. However, the magnetic field exposure unexpectedly protected the bacteria from heat stress, with exposed cells showing 9 times better survival rates when subjected to high temperatures.
Exposure Information
Cite This Study
Unknown (2006). 14.6 mT ELF magnetic field exposure yields no DNA breaks in model system Salmonella, but provides evidence of heat stress protection.
Show BibTeX
@article{146_mt_elf_magnetic_field_exposure_yields_no_dna_breaks_in_model_system_salmonella_but_provides_evidence_of_heat_stress_protection_ce4257,
author = {Unknown},
title = {14.6 mT ELF magnetic field exposure yields no DNA breaks in model system Salmonella, but provides evidence of heat stress protection},
year = {2006},
doi = {10.1002/bem.20210},
}Quick Questions About This Study
No, this study found no significant DNA breaks in Salmonella bacteria exposed to 14.6 mT, 60 Hz magnetic fields for 4 hours. The researchers used sensitive genetic tests to detect both single and double-strand DNA breaks.
14.6 mT is extremely strong - about 140 times stronger than typical household magnetic field exposures. For comparison, standing next to a microwave oven produces roughly 0.1 mT of magnetic field exposure.
Yes, this study found that bacteria pre-exposed to magnetic fields survived heat stress 9 times better than unexposed bacteria. The 53°C heat treatment killed far fewer magnetically pre-conditioned cells than control cells.
The researchers used intermittent exposure - magnetic fields were turned on for 5 minutes, then off for 10 minutes, repeating this cycle for 4 total hours rather than continuous exposure throughout the experiment.
Salmonella bacteria offer many genetic tools and mutant strains that make it easy to detect DNA damage and study cellular responses. This bacterial system provides sensitive, well-established methods for measuring genetic effects.