Bidirectional frequency-dependent effect of extremely low-frequency electromagnetic field on<i>E. coli</i>K-12

Martirosyan, Varsik; Baghdasaryan, Naira; Ayrapetyan, Sinerik

doi:10.3109/15368378.2012.712587

Cited by 17 publications

(9 citation statements)

References 26 publications

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“…Depending on the frequency non-ionizing radiation such as MV and extremely low frequency electromagnetic fields (ELF EMF) have stimulating or depressing effect on the growth and division of microorganisms (Martirosyan et al, , 2013b. However, the mechanism by which MV affect the bacteria cell is not clear yet (Martirosyan, 2012;Martirosyan et al, 2012Martirosyan et al, , 2013a.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of time-dependent effects of 4 and 8 Hz mechanical vibration at infrasound frequency onE. coliK-12 cells proliferation

Martirosyan

Ayrapetyan

2014

Electromagnetic Biology and Medicine

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The aim of the present work is to study the time-dependent effects of mechanical vibration (MV) at infrasound (IS) frequency at 4 and 8 Hz on E. coli K-12 growth by investigating the cell proliferation, using radioactive [(3)H]-thymidine assay. In our previous work it was suggested that the aqua medium can serve as a target through which the biological effect of MV on microbes could be realized. At the same time it was shown that microbes have mechanosensors on the surface of the cells and can sense small changes of the external environment. The obtained results were shown that the time-dependent effects of MV at 4 and 8 Hz frequency could either stimulate or inhibit the growth of microbes depending from exposure time. It more particularly, the invention relates to a method for controlling biological functions through the application of mechanical vibration, thus making it possible to artificially control the functions of bacterial cells, which will allow us to develop method that can be used in agriculture, industry, medicine, biotechnology to control microbial growth.

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Section: Introductionmentioning

confidence: 99%

Comparative study of time-dependent effects of 4 and 8 Hz mechanical vibration at infrasound frequency onE. coliK-12 cells proliferation

Martirosyan

Ayrapetyan

2014

Electromagnetic Biology and Medicine

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“…By our previous experiment, performed on snail hearts, it has been shown that 4 Hz EMF-treated physiological solution (PS) modulates the growth and development of microbes and heart muscle contractility [3] [21].…”

Section: Introductionmentioning

confidence: 99%

Age-Dependent Comparative Study of 4 Hz and 8 Hz EMF Exposure on Heart Muscle Tissue Hydration of Rats

Narinyan¹,

Ayrapetyan²

2019

OJBIPHY

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Previously we have shown that 4 Hz and 8 Hz EMF exposures have depressing effect on the thermodynamic activity of water, which decreases peroxide formation. It has also been shown that 4 Hz EMF-treated physiological solution modulates the growth and development of microbes and heart muscle contractility, but 8 Hz EMF has pronounced inhibitory effect on bacterial growth and development. Therefore, in order to elucidate the possible mechanism of 4 Hz and 8 Hz EMF effects on heart muscle function, in the present work the effects of 4 Hz and 8 Hz EMF exposures on heart muscle tissue hydration, the sensitivity of 4 Hz and 8 Hz EMF-induced tissue hydration to 10 −4 M ouabain (Na + /K + pump inhibition) and 10 −9 M ouabain (activation of intracellular signaling system) as well as the effects of 4 Hz and 8 Hz EMF exposures on the number of Na + /K + pump units in the membrane of both young and old rats have been studied. The obtained data allow us to suggest that 8 Hz EMF exposure has more pronounced age-dependent modulation effect on tissue hydration of heart muscle than 4 Hz EMF and this effect is sensitive to Na + /K + pump activity and intracellular signaling system.

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“…Some studies have been established to verify the effects of ELF-EMF on cell functions (1,2). The effect of ELF-EMF has also been evaluated on bacteria in the studies (3)(4)(5). The results have been showed that ELF-EMF can negatively (6,7) or positively (8,9) effect on the living systems functions and bacteria antibiotic sensitivity, so some results are in contrast with each other.…”

Section: Introductionmentioning

confidence: 99%

Effect of Frequency Magnetic field on Gram Positive and Gram Negative Bacteria

Bayatiani¹,

seif²,

Arjomandzadegan³

et al. 2019

Preprint

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Objective It is necessary to evaluate the harmful or useful effects of electromagnetic waves on living organisms and determine the threshold of these radiations. In this research, the effect of magnetic fields on the growth of gram-positive ( Staphylococcus aureus ) and gram-negative ( Escherichia coli ) bacteria has been evaluated.Results In Gram-negative bacteria such as E. coli in both magnetic fields 1mT and 2mT at different frequencies, an additive effect was seen on the growth of bacteria. When the frequency increased the trend of increasing bacterial growth, slowed. In Gram-positive bacteria such as Staphylococcus, this effect was less. In 1mT magnetic field, the growth of bacteria was seen but the 2mT field was virtually ineffective and the differences between two groups at different frequencies were not significant. Also, significant changes didn't observe with increasing frequency. Study of bacterial growth in terms of frequency in both case and control groups showed an increasing trend. With increasing frequency from 50 Hz to 150Hz significantly increased the rate of bacterial growth and the growth in the higher frequencies more than lower frequencies. Magnetic field had increment effect on the growth of bacteria. This effect was greater on gram-negative than on gram-positive.

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Bidirectional frequency-dependent effect of extremely low-frequency electromagnetic field onE. coliK-12

Cited by 17 publications

References 26 publications

Comparative study of time-dependent effects of 4 and 8 Hz mechanical vibration at infrasound frequency onE. coliK-12 cells proliferation

Comparative study of time-dependent effects of 4 and 8 Hz mechanical vibration at infrasound frequency onE. coliK-12 cells proliferation

Age-Dependent Comparative Study of 4 Hz and 8 Hz EMF Exposure on Heart Muscle Tissue Hydration of Rats

Effect of Frequency Magnetic field on Gram Positive and Gram Negative Bacteria

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