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Electric field effects on bacteria and yeast cells

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Summary

Comparative studies were carried out describing the lethal effects of electric pulses on GRAM-negative bacteria, GRAM-positive bacteria, and yeast cells. Microorganisms are killed by the pulse treatment without visible morphological destruction. The observed survival rates are figured as functions of the field strengthE and the treatment timet (pulse number × time constant) revealing three explicit parameters as sufficient to explain the kinetics of the results. These parameters are determined by the species of microorganism used and moreover depend on the physiological properties of the microbial population. GRAM-positive bacteria and yeasts were found to be less sensitive to electric pulse treatment than GRAM-negative bacteria, when low pulse numbers are applied. Treatment with high pulse numbers reveals survival rates below 1% for all microorganisms examined. Cells from the logarithmic growth phase are killed in markedly higher percentage than cells harvested from the stationary growth phase. The obtained results as well as further studies confirm the hypothesis of an electric induced selective damage of inner cell membranes.

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Authors and Affiliations

  1. Institut für Mikrobiologie, Medizinische Hochschule Hannover, Konstanty-Gutschow-Strasse, D-3000, Hannover, Germany

    H. Hülsheger, J. Potel & E. -G. Niemann

  2. Institut für Biophysik, Universität Hannover, Herrenhäuserstr. 2, D-3000, Hannover, FRG

    E. -G. Niemann

Authors
  1. H. Hülsheger
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  2. J. Potel
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  3. E. -G. Niemann
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Hülsheger, H., Potel, J. & Niemann, E.G. Electric field effects on bacteria and yeast cells. Radiat Environ Biophys 22, 149–162 (1983). https://doi.org/10.1007/BF01338893

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  • DOI: https://doi.org/10.1007/BF01338893

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