Study type: Medical/biological study (experimental study)

Electrostimulation of proliferation of the denitrifying bacterium Pseudomonas stutzeri med./bio.

By: Hoenes I, Pospischil A, Berg H
Published in: Bioelectrochem Bioenerg 1998; 44 (2): 275-277
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Aim of study (acc. to author)

To investigate the effects of a low frequency electromagnetic field on the proliferation of the anaerobic denitrifying bacterium Pseudomonas stutzeri.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 350 Hz–100 kHz
Modulation type: pulsed
Exposure duration: continuous for 10 h

Exposure 1

Main characteristics
Frequency 350 Hz–100 kHz
Type
Waveform
Exposure duration continuous for 10 h
Modulation
Modulation type pulsed
Pulse width 10 µs
Pulse type rectangular
Additional info

bursts of 8 pulses (delay time 220 µs) with a time lag of 1 ms in between [Grosse et al., 1988]
Exposure setup
Exposure source
Chamber electric field fermenter (EFF) with copper coils wrapped around
Additional info Both coils had a resistance of 0.15 Ω together.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 1.3 mT mean measured - -
magnetic flux density 0.6 mT mean measured - -
Measurement and calculation details

The mean generator output was measured using a Teslameter.

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

Bacterial cultures were exposed to 1.3 mT or 0.6 mT, respectively. No changes were found for the latter case. In the first case a marked proliferation increase was observed but the relative nitrate reductase activity (i.e. enzyme activity/mg protein) was not altered.

Study character:

Study funded by

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