Study type: Medical/biological study (experimental study)

Twelve hours exposure to inhomogeneous high magnetic field after logarithmic growth phase is sufficient for drastic suppression of Escherichia coli death. med./bio.

Published in: Bioelectrochemistry 2001; 54 (2): 101-105

Aim of study (acc. to author)

To determine the appropriate exposure time of an inhomogeneous high magnetic field able to supress the cell death of the bacterium Escherichia coli. Cell growth and death were investigated in special gene-deficient E. coli strain ass well.

Endpoint

Exposure

Exposure Parameters
Exposure 1:
Exposure duration: up to 72 h

Exposure 1

Main characteristics
Frequency
Type
Waveform
  • unspecified
Exposure duration up to 72 h
Additional info Inhomogeneous magnetic field with a maximum gradient of 23 T/m was applied
Exposure setup
Exposure source
Chamber Incubator maintained at 37°C
Setup A flask containing bacterial cells was placed in the region where the magnetic field was inhemogeneous
Additional info For control purpose, an incubator was covered with a double-walled cylindrical shell of permalloy to bring the magnetic field lower than the geomagnetic field
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 5.2 T minimum unspecified - to 6.1 T

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

E. coli B showed a drastic cell death after the end of the logarithmic growth phase, when grown aerobically at 43°C in an fourfold diluted standard medium containing 1.5 g/L glutamic acid. This observed cell death was dramatically suppressed by the use of an inhomogeneous high magnetic field. (q.v. publication 10598)
A twelve hour exposure to an inhomogeneous high magnetic field after the logarithmic growth phase were found to be sufficient to evoke the effect of cell death suppression. This magnetic field effect was not found on the rpoS- gene-deficient KT1005 E. coli strain.

Study character:

Study funded by

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