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Microb Pathog 111:414-421, 2017

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Authors not listed · 2017

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Bacteria actively change gene expression to adapt to strong magnetic fields, proving biological systems respond to electromagnetic exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed Salmonella bacteria to a 200 mT static magnetic field for up to 9 hours and measured changes in gene expression. They found that three specific genes involved in cell membrane production increased their activity, suggesting the bacteria were adapting to the magnetic field exposure. This demonstrates that even bacteria can detect and respond to magnetic fields at the cellular level.

Why This Matters

This study adds to the growing body of evidence that magnetic fields can trigger biological responses at the cellular level, even in simple organisms like bacteria. The 200 mT field strength used here is roughly 4,000 times stronger than Earth's magnetic field and about 100 times stronger than typical MRI exposure levels, but it's within the range of some industrial magnetic applications and certain medical devices. What's particularly significant is that the bacteria didn't just survive this exposure - they actively changed their gene expression patterns to adapt to it. The affected genes control production of critical cell membrane components, suggesting the magnetic field was creating enough cellular stress to trigger adaptive responses. This research challenges the assumption that static magnetic fields are biologically inert and supports the principle that living systems can detect and respond to electromagnetic environments across the spectrum.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2017). Microb Pathog 111:414-421, 2017.
Show BibTeX
@article{microb_pathog_111414_421_2017_ce4161,
  author = {Unknown},
  title = {Microb Pathog 111:414-421, 2017},
  year = {2017},
  doi = {10.1016/j.micpath.2017.09.030},
  
}
DOI: 10.1016/j.micpath.2017.09.030PubMed: 28923603

Quick Questions About This Study

Yes, this study found that Salmonella bacteria significantly increased expression of three genes (cls, g3pd, and pssA) when exposed to 200 mT static magnetic fields, indicating active cellular adaptation to the electromagnetic environment.
Gene expression changes appeared as early as 3 hours of exposure for the cls gene, with g3pd and pssA genes showing increased activity after 6 hours, but effects diminished after 9 hours of continuous exposure.
The study found three responsive genes: cls (involved in cardiolipin production), g3pd and pssA (involved in phosphatidylethanolamine synthesis). These genes control production of critical cell membrane components essential for bacterial survival.
No, 200 mT is extremely strong - about 4,000 times Earth's magnetic field and 100 times typical MRI exposure. This level might be found near powerful industrial magnets or certain medical devices.
No, the study found that five genes (plsB, cdsA, pgpA, pgsA, and psd) showed no significant changes, while only three genes increased their expression, suggesting selective biological responses to magnetic field exposure.