Effect Of Low-intensity Magnetic Fields Research Articles

Effect of low-intensity magnetic field on the growth and metabolite of Grifola frondosa in submerged fermentation and its possible mechanisms

This study aimed to investigate the effects of low intensity alternating magnetic field on the submerged fermentation of Grifola frondosa, and its possible mechanism was also explored. Under the optimal shaking flask conditions, amino acids in mycelium with magnetic field treatment significantly increased, and the morphology of mycelium obviously changed. During the scale-up magnetic field-assisted fermentation, Mycelium biomass increased by 12%. The yield of polysaccharides and relative dissolved oxygen in the fermentation broth was higher than in the control group. Transcriptome sequencing results showed that the expression of genes related to amino acid metabolism increased significantly after magnetic treatment. In addition, magnetic field stimulation enhanced the mycelium biomass by upregulation the expression of genes related to cell repair and stress response. This study suggested that applying a magnetic field in submerged fermentation of G frondosa is an innovative approach to produce metabolites.

Effect of low-intensity magnetic fields on constructed wetland mesocosms treating chromium wastewater

Effect of low-intensity magnetic fields on constructed wetland mesocosms treating chromium wastewater

Cellular and molecular effects of electromagnetic radiation and sonic waves

Electromagnetic radiation (in the form of pulsed magnetic fields, radiofrequency and intense pulsed light) and mechanical agents (such as sonic waves) have been used in physical therapy. The aim of this study was to assess the effects of low-intensity magnetic fields, sonic and radiofrequency waves, and intense pulsed light on the survival of Escherichia coli cultures and on the electrophoretic mobility of plasmid DNA. Exponentially growing E. coli AB1157 cultures and plasmid DNA samples were exposed to these physical agents and 0.9% NaCl (negative control) and SnCl2 (positive control) solutions. Aliquots of the cultures were diluted and spread onto a solidified rich medium. The colony-forming units were counted after overnight incubation and the survival fraction was calculated. Agarose gel electrophoresis was performed to visualise and quantify the plasmid topological forms. The results suggest that these agents do not alter the survival of E. coli cells or plasmid DNA electrophoresis mobility. Moreover, they do not protect against the lesive action of SnCl2. These physical agents therefore had no cytotoxic or genotoxic effects under the conditions studied.

Transient effect of low-intensity magnetic field on human motor control

There is no consensus with respect to how extremely low frequency (ELF) magnetic fields (MF) affect biological systems. However, this information is crucial to establishing new guidelines for: (i) the new design of electronic devices, (ii) working conditions of exposed workers (e.g. electric linepersons), and in a general manner (iii) policies for human risk management. This study evaluates the effect of a sinusoidal 50 Hz, 1000 μT MF centered at the level of the head on human postural tremor of the index finger, using the wavelet analysis method. In addition to the detection of transient events in tremor time series linked with MF, this method was used to evaluate the differences between MF “on” and “off” conditions and between real and sham exposure in a counterbalanced protocol. Results indicate that neither transient events nor “off–on” or “on–off” MF transition effects were present in the postural tremor time series. Surprisingly, an unexpected significant time dependent decrease in tremor average power was noted along the 20 s recordings. Interestingly, this effect was significantly more pronounced in the presence of MF. These results suggest a relaxing effect of ELF MF on motor control resulting in an attenuation of postural tremor intensity.

Mechanical factors in human tremor frequency.

Mechanical factors in human tremor frequency.