Study type: Medical/biological study (experimental study)

Effects of a 60 Hz magnetic field on photosynthetic CO(2) uptake and early growth of radish seedlings. med./bio.

Published in: Bioelectromagnetics 2004; 25 (8): 572-581

Aim of study (acc. to author)

To investigate the photosynthetic CO2 uptake rate and early growth parameters of radish seedlings exposed to an extremely low frequency magnetic field.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 60 Hz
Exposure duration: continuous for 6 days
Exposure 2: 60 Hz
Exposure duration: continuous for 15 days
Exposure 3: 60 Hz
Exposure duration: intermittent, 1 h on/1 h off

Exposure 1

Main characteristics
Frequency 60 Hz
Type
Waveform
Exposure duration continuous for 6 days
Additional info a combination of 60 Hz magnetic field and static magnetic field was applied
Exposure setup
Exposure source
Setup culture vessel of seedling was positioned at the center of coil system
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 50 µT effective value measured - -
magnetic flux density 48 µT - measured - static magnetic field in x direction

Exposure 2

Main characteristics
Frequency 60 Hz
Type
Waveform
Exposure duration continuous for 15 days
Additional info A combination of 60 Hz magnetic field and static magnetic field was applied
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 48 µT - measured - static magnetic field in x direction
magnetic flux density 50 µT effective value measured - -

Exposure 3

Main characteristics
Frequency 60 Hz
Type
Exposure duration intermittent, 1 h on/1 h off
Additional info A combination of 60 Hz magnetic field and static magnetic field was applied
Exposure setup
Exposure source
  • same setup as exposure 1
  • electromagnetically shielded room
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 48 µT - measured - static magnetic field in x direction
magnetic flux density 50 µT effective value measured - -

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)

Experiment 1 and 2 (continuous exposure for 6 and 15 days): The CO2 uptake rate of extremely low frequency electromagnetic field exposed seedlings on day 5 and later was lower than that of the control plants. The dry weight and the cotyledon area of exposed seedlings on day 6 and the fresh weight, the dry weight and the leaf area of exposed plants on day 15 were significantly lower than those of the control seedlings, respectively.
Experiment 3 (short term exposure): There was no difference in the CO2 uptake rate of plants exposed to the extremely low frequency electromagnetic field or the ambient magnetic field.
These data indicate that continuous exposure to 60 Hz sinusoidal magnetic field with a parallel static magnetic field affects the early growth of radish seedlings, but the effect is not so severe that modification of photosynthetic CO2 uptake can be observed during short term magnetic field exposure.

Study character:

Study funded by

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