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Low-level, magnetic-field-induced growth modification of Bacillus subtilis

โœ Scribed by Dr. Ceon Ramon; J. T. Martin; M. R. Powell

Book ID
102758866
Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
618 KB
Volume
8
Category
Article
ISSN
0197-8462

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โœฆ Synopsis

Experimental studies showed an increase in the growth of Bacillus subfilis mutant strain FJ7 above controls by exposing the bacterial culture to 800-Hz or 1-KHz magnetic fields with a 2-s-on /2-s-off period. The magnetic field strength was between 0.8 and 2. 5 mT. Light microscopy and scanning electron microscopy demonstrated the morphology of controls to grow in a macrofiber of right-handed helix formation. In contrast, the fieldexposed group showed little to no cohesion; the cells appeared to be homogeneously distributed throughout the sample. These results suggest that growth patterns of Bacillus subtilis can be altered as a result of magnetic-field-induced effects.

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## Abstract Cultures of Escherichia coli kept at 0 ยฐC in a phosphate buffer solution were exposed to a sinusoidal weak 60โ€ or 600โ€Hz magnetic field of strength 2 ร— 10^โˆ’3^ Tesla. A decrease of more than 40% in bacterial count was observed after a 60โ€h exposure to the magnetic field. Electron microgr