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Review of the specific effects of microwave radiation on bacterial cells

Yury Shamis1, Rodney Croft, Alex Taube

  • 1Faculty of Life and Social Sciences, Swinburne University of Technology, Melbourne, Australia.

Applied Microbiology and Biotechnology
|August 10, 2012
PubMed

Insights

This review examines microwave (MW) effects on prokaryotic microorganisms, finding that claimed non-thermal impacts lack justification due to inadequate temperature controls. Unmeasurable micro-thermal effects specific to MW radiation remain a possibility.

Area of Science:

  • Microbiology
  • Biophysics
  • Electromagnetics

Background:

  • Microwave (MW) processing is increasingly used in microbiology.
  • There are claims of specific MW effects on prokaryotic microorganisms beyond thermal increases.
  • Understanding these effects is crucial for applications and safety.

Purpose of the Study:

  • To review and evaluate literature on purported non-thermal microwave effects on prokaryotic microorganisms.
  • To assess the validity of attributing observed effects solely to non-thermal mechanisms.
  • To explore potential explanations for observed phenomena.

Main Methods:

  • Literature review of studies investigating microwave effects on prokaryotic cells.
  • Analysis of experimental controls, particularly regarding temperature measurement.
  • Evaluation of reported cellular effects including membranes, proteins, enzyme activity, and cell death.

Main Results:

  • Attribution of effects to non-thermal mechanisms is not justified due to poor experimental controls.
  • The possibility of unmeasurable instantaneous temperature (T(i)) during MW processing complicates interpretation.
  • Lack of precise temperature control prevents definitive conclusions about non-thermal effects.

Conclusions:

  • Current evidence does not support non-thermal microwave effects on prokaryotes due to methodological limitations.
  • Ambiguity remains regarding the precise nature of MW-induced cellular changes.
  • The potential for internal 'micro'-thermal effects, specific to MW energy deposition patterns, is proposed.

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