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Microbiol Res. 2015 Mar;172:26-33. doi: 10.1016/j.micres.2014.12.008. Epub 2015 Jan 19.

Bacterial growth rates are influenced by cellular characteristics of individual species when immersed in electromagnetic fields.

Author information

  • 1Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario, Canada P3E 2C6; Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6. Electronic address: lx_tessaro@laurentian.ca.
  • 2Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario, Canada P3E 2C6; Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6.
  • 3Behavioural Neuroscience Program, Laurentian University, Sudbury, Ontario, Canada P3E 2C6; Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6. Electronic address: mpersinger@laurentian.ca.

Abstract

Previous studies have shown that exposure to extremely low-frequency electromagnetic fields (ELF-EMFs) have negative effects on the rate of growth of bacteria. In the present study, two Gram-positive and two Gram-negative species were exposed to six magnetic field conditions in broth cultures. Three variations of the 'Thomas' pulsed frequency-modulated pattern; a strong-static "puck" magnet upwards of 5000G in intensity; a pair of these magnets rotating opposite one another at ∼30rpm; and finally a strong dynamic magnetic field generator termed the 'Resonator' with an average intensity of 250μT were used. Growth rate was discerned by optical density (OD) measurements every hour at 600nm. ELF-EMF conditions significantly affected the rates of growth of the bacterial cultures, while the two static magnetic field conditions were not statistically significant. Most interestingly, the 'Resonator' dynamic magnetic field increased the rates of growth of three species (Staphylococcus epidermidis, Staphylococcus aureus, and Escherichia coli), while slowing the growth of one (Serratia marcescens). We suggest that these effects are due to individual biophysical characteristics of the bacterial species.

KEYWORDS:

Bacteria; Biophysics; E. coli; Electromagnetic fields; Rates of growth

PMID:
25721476
DOI:
10.1016/j.micres.2014.12.008
[PubMed - indexed for MEDLINE]
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