Study type: Medical/biological study (experimental study)

Stimulating effects of modulated 150 MHz electromagnetic fields on the growth of Escherichia coli in a cavity resonator med./bio.

By: Grospietsch T, Schulz O, Hoelzel R, Lamprecht I, Kramer KD
Published in: Bioelectrochem Bioenerg 1995; 37 (1): 17-23
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Aim of study (acc. to author)

To investigate the effects of FM modulated 150 MHz electromagnetic fields on the growth of the bacterium Escherichia coli.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 150 MHz
Modulation type: pulsed
Exposure duration: continuously for 6 h
Exposure 2: 150 MHz
Modulation type: pulsed
Exposure duration: continuously for 6 h
Exposure 3: 150 MHz
Modulation type: pulsed
Exposure duration: continuously for 6 h
Exposure 4: 150 MHz
Exposure duration: continuously for 6 h

Exposure 1

Main characteristics
Frequency 150 MHz
Type
Waveform
Exposure duration continuously for 6 h
Additional info modulation-frequency: 72 Hz
Modulation
Modulation type pulsed
Duty cycle 50 %
Repetition frequency 72 Hz
Pulse type rectangular
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.6 kV/m maximum calculated - -
magnetic flux density 5.4 µT maximum measured - -

Exposure 2

Main characteristics
Frequency 150 MHz
Type
Waveform
Exposure duration continuously for 6 h
Additional info modulation-frequency: 217 Hz
Modulation
Modulation type pulsed
Duty cycle 50 %
Repetition frequency 217 Hz
Pulse type rectangular
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.6 kV/m maximum calculated - -
magnetic flux density 5.4 µT maximum measured - -

Exposure 3

Main characteristics
Frequency 150 MHz
Type
Waveform
Exposure duration continuously for 6 h
Additional info modulation-frequency: 1100 Hz
Modulation
Modulation type pulsed
Duty cycle 50 %
Repetition frequency 1,100 Hz
Pulse type rectangular
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.6 kV/m maximum calculated - -
magnetic flux density 5.4 µT maximum measured - -

Exposure 4

Main characteristics
Frequency 150 MHz
Type
Waveform
Exposure duration continuously for 6 h
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.6 kV/m maximum calculated - -
magnetic flux density 5.4 µT maximum measured - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

A stimulation effect of electromagnetic field exposure on the growth of E. coli was observed. The growth behaviour was identical within the various modulation frequencies and unmodulated field conditions. Microthermal effects at cellular level could not be excluded.

Study character:

Study funded by

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