Study type: Medical/biological study (experimental study)

Different effects of microwave energy and conventional heat on the activity of a thermophilic beta-galactosidase from Bacillus acidocaldarius. med./bio.

Published in: Bioelectromagnetics 1999; 20 (3): 172-176

Aim of study (acc. to author)

To test the effect of microwave irradiation on the activity of the thermostable enzyme β-galactosidase purified from the thermoacidophilic eubacterium Bacillus acidocaldarius.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 10.4 GHz
Exposure duration: 15, 30, 45, 60 min
  • SAR: 1.7 W/g average over time
Exposure 2: 10.4 GHz
Exposure duration: continuous for 1 h
  • SAR: 1.1 W/g average over time
  • SAR: 1.7 W/g average over time

General information

control samples were kept at 70 °C without microwave irradiation

Exposure 1

Main characteristics
Frequency 10.4 GHz
Type
Exposure duration 15, 30, 45, 60 min
Exposure setup
Exposure source
Setup samples placed inside the waveguide
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.7 W/g average over time calculated - -

Exposure 2

Main characteristics
Frequency 10.4 GHz
Type
Exposure duration continuous for 1 h
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.1 W/g average over time calculated - -
SAR 1.7 W/g average over time calculated - -

Reference articles

  • d'Ambrosio G et al. (1995): Genotoxic Effects of Amplitude-Modulated Microwaves on Human Lymphocytes Exposed in Vitro under Controlled Conditions.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

An irreversible enzym inactivation induced by microwave irradiation was observed, depending on protein concentration and microwave intensity. This effect was not found at high protein concentration. Enzym inactivation was not observed in control experiments without microwave irradiation.

Study character:

Study funded by

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