Study type: Medical/biological study (experimental study)

Influence of non-thermic AC magnetic fields on spore germination in a dimorphic fungus. med./bio.

Published in: Radiat Environ Biophys 1990; 29 (2): 143-152

Aim of study (acc. to author)

To investigate the effects of a pulsed 150-MHz exposure on spore germination of the fungus Mycotypha africana.

Background/further details

Depending upon an appropriate carbon nutrition source the fungus M. africana grows as a mycelium (M-culture) or in a yeast-like form (Y-culture).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 150 MHz
Exposure duration: continuous for 5 h
Exposure 2: 150 MHz
Exposure duration: continuous for 24 h

Exposure 1

Main characteristics
Frequency 150 MHz
Exposure duration continuous for 5 h
Modulation
Modulation type cf. additional info
Additional info

Modulated at 10 Hz, rise time < 5 ns and decay time 125 µs.

Exposure setup
Exposure source
Distance between exposed object and exposure source 0.006 m
Setup Petri dishes were placed on the top of the coil at a constant temperature of 21°C.
Additional info Control dishes were kept in the same room at 3.5 m away from the coil where no magnetic field was detected.
Parameters
Measurand Value Type Method Mass Remarks
power 200 µW - cf. remarks - 101 mW
electric field strength 3 mV/m minimum cf. remarks - 500 mV/cm

Exposure 2

Main characteristics
Frequency 150 MHz
Exposure duration continuous for 24 h
Modulation
Modulation type cf. additional info
Additional info

Modulated at 10 Hz, rise time < 5 ns and decay time 125 µs.

Exposure setup
Exposure source
Distance between exposed object and exposure source 0.006 m
Parameters
Measurand Value Type Method Mass Remarks
power 200 µW - cf. remarks - 101 mW
electric field strength 3 mV/m minimum cf. remarks - 500 mV/cm

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

5 h and 24 h exposure of Y-cultures led to the same effects. At low intensity levels an 2 to 3 fold increased germination rate was observed, whereas a mid intensity level decreased it up to a factor of 4.
M-cultures exhibited the same germination pattern for a 5 h exposure but no effect was found for a 24 h exposure.

Study character:

Study funded by

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