Study type: Medical/biological study (experimental study)

Comparison of bacterial growth to high-intensity microwave exposure and conventional heating med./bio.

Published in: Bioelectromagnetics 1982; 3 (4): 471-474

Aim of study (acc. to author)

To compare growth rate of Escherichia coli cultures exposed to high-intensity pulsed 8.8 GHz-microwaves and conventional heating.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 8.8 GHz
Modulation type: pulsed
Exposure duration: continuous for 2, 5, 10, or 15 h

Exposure 1

Main characteristics
Frequency 8.8 GHz
Type
Charakteristic
Polarization
Exposure duration continuous for 2, 5, 10, or 15 h
Modulation
Modulation type pulsed
Pulse width 1 µs
Duty cycle 0.1 %
Repetition frequency 1,000 Hz
Exposure setup
Exposure source
Distance between exposed object and exposure source 50 cm
Chamber Two foamed polystyrene chambers were supplied with the same temperature-controlled air (35.2 °C), one for exposure in the anechoic room and the other one for control.
Setup Cell suspensions (3 ml, about 3 mm thick) were placed in 35-mm plastic Petri dishes sealed in Saran wrap and exposed from above.
Additional info For conventional heating, samples were incubated at 42.2 °C for 0, 2, 5, 10, and 15 h. Control samples were also incubated at 35.2 °C for up to 15 h.
Parameters
Measurand Value Type Method Mass Remarks
power density 20 mW/cm² mean - - -
SAR 40 W/kg - measured - -

Reference articles

  • Allis JW et al. (1977): Measurement of microwave radiation absorbed by biological systems, 1. Analysis of heating and cooling data

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

8.8 GHz pulsed microwave radiation has no effect on the growth of E. coli beyond that associated with temperature increase.

Study character:

Study funded by

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