30 ml plastic culture flasks containing E. coli in a fluid medium were used
coils were made up of 154 turns of copper wire with a diameter of 2.2 mm having inner and outer diameters of 40.5 and 45.5 cm, respectively; coils were placed in horizontal plane to produce vertically oriented magnetic field; distance between the coils was 21.375 cm; electrical parameters of the coils were resistance of 1.2 ohm and inductance of 19.6 mH; coils were driven with a variable transformer with a power of 2.7 kVA; system was mounted on a wooden frame; culture flasks were placed at the center of the coil-based exposure system (homogenous exposure region) in vertical position, so that the magnetic field was perpendicular to the bottom of the flasks
Bayir E et al.
The effects of different intensities, frequencies and exposure times of extremely low-frequency electromagnetic fields on the growth of Staphylococcus aureus and Escherichia coli O157:H7.
Nawrotek P et al.
Effects of 50 Hz rotating magnetic field on the viability of Escherichia coli and Staphylococcus aureus.