Effects of Static Magnetic Field on Cell Growth, Viability, and Differential Gene Expression in <i>Salmonella</i>

May, Alya El; Snoussi, Sarra; Miloud, Najla Ben; Maatouk, Imed; Abdelmelek, Hafedh; Aissa, Ridha Ben; Landoulsi, Ahmed

doi:10.1089/fpd.2008.0244

Cited by 34 publications

(13 citation statements)

References 19 publications

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“…Many studies have shown that low-density static and low frequency magnetic field inhibited the growth of Escherichia coli (Filipic, Kraigher, Tepus, Kokol, & Mandic-Mulec, 2012;Fojt, Strasak, Vetterl, & Smarda, 2004). El May et al (2009) has proved that static magnetic field (SMF) exposure could alter cell growth, viability, and gene expression in some bacteria.…”

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confidence: 99%

Comparison study of static and alternating magnetic field treatments on the quality preservation effect of cherry tomato at low temperature

Yang

Zhang

Zhao

et al. 2020

J Food Process Engineering

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The objective of this study is to investigate the effects of a static magnetic field (SMF) and alternating magnetic field (AMF) treatment on thermophysical property and preservation quality of cherry tomato. Freshly harvested cherry tomatoes were treated with SMF and AMF at 40 Gs and 80 Gs when hydrocooling pretreatment was performed at 2°C for 30 min. Control tomato fruits were hydrocooled without magnetic field treatment at 2°C for 30 min. The cooling rate, weight loss, color difference, electrical conductivity, malondialdehyde, and catalase were measured. The results showed that the cooling time of SMF treatment was decreased by 16.7% compared with the control treatment. SMF and AMF treatments significantly (p < .05) increased catalase activity and improved the quality of cherry tomatoes during storage. AMF strength at 80 Gs, was the best treatment for reducing weight loss and increasing catalase activity, while the smallest color difference was observed when the SMF at 40 Gs was applied. The results demonstrated that SMF is an alternative method to delay the postharvest ripening process and maintaining the quality of the cherry tomato, which could be due to the higher activity of the antioxidant enzyme catalase. Practical applications The main aim of this study was to compare the effects of SMF and AMF treatment on the preservation quality of cherry tomato. The results demonstrated that magnetic field technology could be applied to fruit and vegetable preservation, and SMF treatment was more helpful to inhibit the ripening of the cherry tomato. This study will broaden the knowledge of food preservation engineers and provide an alternative technology of fruit and vegetable preservation. The parameters used in this study can provide a reference for the development of commercial equipment.

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confidence: 99%

Comparison study of static and alternating magnetic field treatments on the quality preservation effect of cherry tomato at low temperature

Yang

Zhang

Zhao

et al. 2020

J Food Process Engineering

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“…As it is more difficult to evaluate the effect of low-intensity magnetic fields because it may interfere with the earth's magnetic field and because results are often conflicting, we selected a high induction (200 mT) field. The static magnetic field exposure (200 mT) induced a stress status in S. Hadar (El May et al 2009). Furthermore, Pickering et al (2003) showed that the Staphylococcus epidermidis biofilms had greatly increased susceptibility to gentamicin.…”

Section: Discussionmentioning

confidence: 99%

“…Among these have been the effects on cell growth, proliferation and cell viability (Raylman et al 1996;Potenza et al 2004b;Ji et al 2009;Obermeier et al 2009), cell morphotype (Cellini et al 2008), increased calcium influx Amara et al 2004), altered DNA in terms of point mutations (Potenza et al 2004a), inhibition of nocturnal levels of melatonin (Brendel et al 2000), protein synthesis (Goodman et al 1993), transport of ions by cell membranes (D'Inzeo et al 1993) and gene transcription (Phillips et al 1992). In terms of electromagnetic field action in bacteria, several papers have reported alterations on growth, DNA molecules and gene expression Potenza et al 2004b;El May et al 2009). Escherichia coli cells exposed to an extremely low frequency magnetic field (0.1 T) for 6.5 h exhibited changes in viability compared to unexposed cells, which had a viability 100 times higher than the control (Justo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…In terms of electromagnetic field action in bacteria, several papers have reported alterations on growth, DNA molecules and gene expression Potenza et al 2004b;El May et al 2009). Escherichia coli cells exposed to an extremely low frequency magnetic field (0.1 T) for 6.5 h exhibited changes in viability compared to unexposed cells, which had a viability 100 times higher than the control (Justo et al 2006). El May et al (2009 reported that a static magnetic field (200 mT) induced a decrease of colony-forming units (CFU) of Salmonella enterica subsp.…”

Section: Introductionmentioning

confidence: 99%

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Static magnetic field increases the sensitivity of Salmonella to gentamicin

et al. 2010

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The present study was carried out to evaluate the effects of static magnetic field (SMF) on antibiotic sensitivity of Salmonella enterica subsp. enterica serovar Hadar. We have evaluated antibiotic susceptibility using the disc diffusion method following exposure to SMF. Our results showed that exposure to a 200-mT SMF static magnetic field increased the efficiency (p<0.01) of gentamicin against Salmonella Hadar but did not affect the diameter of the inhibition zone of some other antibiotics actives on Enterobacteria: penicillin, oxacillin, cephalotin, neomycin, amikacin, tetracyclin, erythromycin, spiramycin, chloramphenicol, nalidixic acid and vancomycin.

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“…For example, there was a decrease in the viability of Helicobacter pylori after exposure to ELF-EMF ( Di Campli et al , 2010 ), whereas Salmonella enterica subsp. enterica serovar Hadar showed overexpression of the genes rpoA , katN , and dnaK ( El May et al , 2009 ). To date, few studies have used omics techniques to evaluate the gene expression profile of organisms exposed to electromagnetic fields.…”

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Exposure to an extremely low-frequency electromagnetic field only slightly modifies the proteome of Chromobacterium violaceum ATCC 12472

et al. 2015

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Several studies of the physiological responses of different organisms exposed to extremely low-frequency electromagnetic fields (ELF-EMF) have been described. In this work, we report the minimal effects of in situ exposure to ELF-EMF on the global protein expression of Chromobacterium violaceum using a gel-based proteomic approach. The protein expression profile was only slightly altered, with five differentially expressed proteins detected in the exposed cultures; two of these proteins (DNA-binding stress protein, Dps, and alcohol dehydrogenase) were identified by MS/MS. The enhanced expression of Dps possibly helped to prevent physical damage to DNA. Although small, the changes in protein expression observed here were probably beneficial in helping the bacteria to adapt to the stress generated by the electromagnetic field.

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Effects of Static Magnetic Field on Cell Growth, Viability, and Differential Gene Expression in Salmonella

Cited by 34 publications

References 19 publications

Comparison study of static and alternating magnetic field treatments on the quality preservation effect of cherry tomato at low temperature

Comparison study of static and alternating magnetic field treatments on the quality preservation effect of cherry tomato at low temperature

Static magnetic field increases the sensitivity of Salmonella to gentamicin

Exposure to an extremely low-frequency electromagnetic field only slightly modifies the proteome of Chromobacterium violaceum ATCC 12472

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