Study type: Medical/biological study (experimental study)

Millimeter waves thermally alter the firing rate of the Lymnaea pacemaker neuron med./bio.

By: Alekseev SI, Ziskin MC, Kochetkova NV, Bolshakov MA
Published in: Bioelectromagnetics 1997; 18 (2): 89-98
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Aim of study (acc. to author)

To examine the effect of millimeter waves on the firing rate of a pacemaker neuron.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 75 GHz
Modulation type: CW
Exposure duration: short term exposure 2 min
  • SAR: 1.55 W/g (at 4.6 mW)
  • SAR: 2.8 W/g (at 9.0 mW)
  • SAR: 600 mW/g (at 1.8 mW.)
  • SAR: 3.15 W/g (at 9.7 mW)
  • SAR: 4.2 W/g (at 12.6 mW)
Exposure 2: 75 GHz
Modulation type: CW
Exposure duration: long term exposure of 12-22 min
  • SAR: 1.55 W/g (at 4.6 mW)
  • SAR: 2.8 W/g (at 9.0 mW)
  • SAR: 600 mW/g (at 1.8 mW.)
  • SAR: 3.15 W/g (at 9.7 mW)
  • SAR: 4.2 W/g (at 12.6 mW)

Exposure 1

Main characteristics
Frequency 75 GHz
Type
Exposure duration short term exposure 2 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber Plexiglass chamber/ 2 ml
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.55 W/g - - cf. remarks at 4.6 mW
SAR 2.8 W/g - - cf. remarks at 9.0 mW
SAR 600 mW/g - - cf. remarks at 1.8 mW.
SAR 3.15 W/g - - cf. remarks at 9.7 mW
SAR 4.2 W/g - - cf. remarks at 12.6 mW

Exposure 2

Main characteristics
Frequency 75 GHz
Type
Exposure duration long term exposure of 12-22 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber Plexiglass chamber/ 2 ml
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.55 W/g - - cf. remarks at 4.6 mW
SAR 2.8 W/g - - cf. remarks at 9.0 mW
SAR 600 mW/g - - cf. remarks at 1.8 mW.
SAR 3.15 W/g - - cf. remarks at 9.7 mW
SAR 4.2 W/g - - cf. remarks at 12.6 mW

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Irradiation at an SAR of 4200 W/kg caused a biphasic change in the firing rate, i.e., a transient decrease in the firing rate followed by a gradual increase to a new level that was above control. The biphasic changes in the firing rate were reproduced by heating under the condition that the magnitude (2°C) and the rate of temperature rise (0.96°C/s) were equal to those produced by the irradiation (for an SAR of 4030 W/kg). It was demonstrated that the rate of temperature rise played an important role in the development of a transient neuronal response.

Study character:

Study funded by

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