Comparison of the low-frequency magnetic field effects on bacteria Escherichia coli, Leclercia adecarboxylata and Staphylococcus aureus.
This work studies biological effects of low-frequency electromagnetic fields. We have exposed three different bacterial strains-Escherichia coli, Leclercia adecarboxylata and Staphylococcus aureus to the magnetic field (t<30 min, B(m)=10 mT, f=50 Hz) in order to compare their viability (number of colony-forming units (CFU)). We have measured the dependence of CFU on time of exposure and on the value of the magnetic field induction B(m). Viability decreases with longer exposure time and/or higher induction B(m) for all strains, but the quantity of the effect is strain-dependent. The highest decrease of the viability and the biggest magnetic field effect was observed with E. coli. The smallest magnetic field effect appears for S. aureus. From the measurement of the growth dynamics we have concluded that the decrease of the CFU starts immediately after the magnetic field was switched on.
Fojt
Lukás
L
Institute of Biophysics, Academy of Sciences of the Czech Republic, Královopolská 135, Brno 612 65, Czech Republic.
Strasák
Ludek
L
Vetterl
Vladimír
V
Smarda
Jan
J
D000222:Adaptation, Physiological / Q000528:radiation effects; D002455:Cell Division / Q000528:radiation effects; D002470:Cell Survival; D004307:Dose-Response Relationship, Radiation; D004560:Electricity; D004574:Electromagnetic Fields; D004755:Enterobacteriaceae / Q000166:cytology* / Q000502:physiology / Q000528:radiation effects*; D004926:Escherichia coli / Q000166:cytology* / Q000502:physiology / Q000528:radiation effects*; D011829:Radiation Dosage; D013045:Species Specificity; D013211:Staphylococcus aureus / Q000166:cytology* / Q000502:physiology / Q000528:radiation effects*