Study type: Medical/biological study (experimental study)

Drastic high magnetic field effect on suppression of Escherichia coli death med./bio.

By: Horiuchi S, Ishizaki Y, Okuno K, Ano T, Shoda M
Published in: Bioelectrochemistry 2001; 53 (2): 149-153
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Aim of study (acc. to author)

To investigate the growth of the bacterium Escherichia coli during inhomogeneous magnetic field exposure (up to 80 hours, 5.2-6.1 T).

Endpoint

Exposure

Exposure Parameters
Exposure 1:
Exposure duration: up to ca. 80 h

Exposure 1

Main characteristics
Frequency
Type
Exposure duration up to ca. 80 h
Exposure setup
Exposure source
Chamber Incubator maintained at 43°C
Setup A flask containing bacterial cells was placed in the region where the magnetic field was inhomogeneous which decreased with a maximum gradient of 23 T/m. 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 was grown aerobically in a fourfold diluted standard medium supplemented with different amounts of glutamic acid at 43°C. Unexposed cultures (i.e. under geomagnetic filed conditions) served as control.
It was found that the cell number in the stationary phase was significantly increased (up to 100.000 times) due to magnetic field exposure at glutamic acid concentration of 1.5 g/L. Also the amount of sigma S factor was increased as determined by western blot analysis.

Study character:

Study funded by

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