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Low-frequency electromagnetic fields alter the replication cycle of MS2 bacteriophage
J Staczek1, A A Marino, L B Gilleland
1Department of Microbiology & Immunology, Louisiana State University Medical Center, 1501 Kings Hwy., Shreveport, LA 71130-3932, USA.
Abstract:
The effect of exposure to 60-Hz electromagnetic fields (EMFs) on RNA coliphage MS2 replication was studied. EMF exposure commenced when the bacterial cultures were inoculated with the phage (t = 0). In 12 experiments in which the strength of the field was 5 G, a significant delay in phage yield was found in the EMF-exposed cultures 45-65 min after inoculation, compared with control cultures. However, the EMF did not alter the final phage concentration. Experiments at 25 G (N = 5) suggested that the stronger field resulted in both impeded phage replication and increased phage yield. No differences between test groups were found in experiments involving sham-EMF exposure, thereby indicating that the results obtained with the EMFs were not due to systematic error. It appears that MS2, which codes for only four proteins, is the simplest biological system in which an EMF-induced effect has been demonstrated. The MS2 system is, therefore, conducive to follow-up studies aimed at understanding the level and nature of the underlying interaction process, and perhaps to biophysical modeling of the interaction process.
Insights
Exposure to 60-Hz electromagnetic fields (EMFs) delayed RNA coliphage MS2 replication. While the final phage concentration remained unchanged, the simplest biological system yet studied showed EMF-induced effects.
Area of Science:
- Biophysics
- Molecular Biology
- Microbiology
Background:
- Electromagnetic fields (EMFs) are ubiquitous.
- Understanding EMFs' biological effects is crucial.
- RNA coliphage MS2 is a simple model system for studying viral replication.
Purpose of the Study:
- To investigate the impact of 60-Hz EMFs on RNA coliphage MS2 replication.
- To determine if EMF exposure affects phage yield and concentration.
- To establish MS2 as a model for studying EMF-biological interactions.
Main Methods:
- Bacterial cultures were inoculated with MS2 phage.
- Cultures were exposed to 60-Hz EMFs at 5 G and 25 G.
- Phage yield and concentration were measured over time, with sham exposures for control.
Main Results:
- A 5 G field caused a significant delay in phage yield (45-65 min post-inoculation).
- A 25 G field impeded replication and increased final phage yield.
- Sham exposures showed no differences, validating EMF-specific effects.
Conclusions:
- 60-Hz EMFs demonstrably affect MS2 phage replication.
- MS2 represents the simplest biological system showing EMF-induced effects.
- The MS2 system is suitable for further research into EMF-biological interaction mechanisms.