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Interaction of microwaves and a temporally incoherent magnetic field on single and double DNA strand breaks in rat brain cells

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Lai H, Singh NP · 2005

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Exposing rats simultaneously to a temporally incoherent magnetic field noise blocked microwave-induced DNA strand breaks in brain cells.

Plain English Summary

Summary written for general audiences

Researchers studied four groups of rats: one exposed to 2450-MHz microwaves at 1 mW/cm2, one to magnetic field noise at 45 mG, one to both simultaneously, and a sham-exposed group. Brain cells of microwave-exposed rats had significantly higher levels of DNA single- and double-strand breaks compared with sham-exposed animals. Noise exposure alone did not significantly affect DNA strand break levels, but simultaneous noise exposure blocked the microwave-induced increases.

Why This Matters

Animals were exposed for 2 hours, and DNA strand breaks were measured 4 hours later using a microgel electrophoresis assay. The microwave exposure used a whole-body specific absorption rate of 0.6 W/kg. The researchers concluded that simultaneous exposure to a temporally incoherent magnetic field could block microwave-induced DNA damage in rat brain cells.

Exposure Details

Magnetic Field
0.0045 mT
SAR
0.6 W/kg
Power Density
1 mW/cm²
Source/Device
2450-MHz microwaves and noise magnetic fields
Exposure Duration
2h

Exposure Context

This study used 1 mW/cm² for radio frequency:

This study used 0.0045 mT for magnetic fields:

This study used 0.6 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1 mW/cm²Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The effect of a temporally incoherent magnetic field noise on microwave-induced DNA single and double strand breaks in rat brain cells was investigated.

Four treatment groups of rats were studied: microwave-exposure (continuous-wave 2450-MHz microwaves,...

Results show that brain cells of microwave-exposed rats had significantly higher levels of DNA singl...

These data indicate that simultaneous exposure to a temporally incoherent magnetic field could block microwave-induced DNA damage in brain cells of the rat.

Cite This Study
Lai H, Singh NP (2005). Interaction of microwaves and a temporally incoherent magnetic field on single and double DNA strand breaks in rat brain cells Electromag Biol Med 24:23- 29, 2005.
Show BibTeX
@article{h_2005_interaction_of_microwaves_and_36,
  author = {Lai H and Singh NP},
  title = {Interaction of microwaves and a temporally incoherent magnetic field on single and double DNA strand breaks in rat brain cells},
  year = {2005},
  doi = {10.1081/JBC-200055046},
  url = {http://informahealthcare.com/doi/abs/10.1081/JBC-200055046},
}
DOI: 10.1081/JBC-200055046

Cited By (52 papers)

View all 52 citing papers on Semantic Scholar

Quick Questions About This Study

Microwave-exposed rats had significantly higher levels of both DNA single- and double-strand breaks compared with sham-exposed animals.
Noise exposure alone did not significantly affect DNA strand break levels, which were similar to those of sham-exposed rats.
Simultaneous noise exposure blocked the microwave-induced increases in DNA strand breaks.
The study used continuous-wave 2450-MHz microwaves at a power density of 1 mW/cm2 and a whole-body specific absorption rate of 0.6 W/kg.
DNA single- and double-strand breaks were assayed using a microgel electrophoresis assay.