Gutiérrez-Mercado YK et al. · 2013
Researchers used 96 Wistar male rats divided into three groups of 32 rats each: a control group, a sham group, and an experimental group exposed to extremely low frequency magnetic fields at 120 Hz and 0.66 mT. All animals received colloidal carbon intravenously, and capillary permeability was studied using optical and transmission electron microscopy. In the exposed group, researchers detected an increase in capillary permeability and a significant increase in vascular area, effects not seen in the control or sham groups.
Gutiérrez-Mercado YK et al. · 2013
Researchers exposed rats to 120 Hz magnetic fields and found the fields made brain blood vessels leaky and dilated. This suggests EMF exposure might weaken the blood-brain barrier, which normally protects the brain from harmful substances in the bloodstream.
Esmekaya MA et al. · 2013
Researchers investigated the effects of a 50 Hz, 2 mT magnetic field, with or without iron(III) chloride, on the growth and morphology of Escherichia coli. No significant differences in cell viability were found between exposed and sham-exposed bacteria, and FeCl3 treatment also did not change cell viability. However, pore formations and membrane destruction were observed on the surface of cells exposed to the ELF field for 24 hours.
Esmekaya MA et al. · 2013
Scientists exposed E. coli bacteria to 50 Hz magnetic fields for 24 hours. While the bacteria survived normally, the magnetic field exposure damaged their cell surfaces, creating holes and destroying membranes. This shows EMF can harm cells even when they appear healthy overall.
El Gohary MI, Salama AA, El Saeid AA, El Sayed TM, Kotb HS. · 2013
Researchers studied how caffeine and extremely low-frequency magnetic field (ELF-MF) exposure affected brain electrical activity in rats over 15 days. Caffeine given at 10 mg/kg caused a reduction in the mean power amplitude of EEG signals across most frequency bands, especially the alpha band (8–12 Hz), and this effect was more evident in motor cortex than in visual cortex. Exposure to ELF-MF at 0.2 mT enhanced mean power amplitude in most EEG frequency bands, with the effect more pronounced in the right hemisphere than the left. When caffeine was given alongside ELF-MF exposure, a large increase in alpha-band amplitude appeared after 5 days at all recording sites.
El Gohary MI, Salama AA, El Saeid AA, El Sayed TM, Kotb HS. · 2013
Researchers exposed rats to extremely low frequency magnetic fields (the type emitted by power lines and appliances) for 15 days and found these fields significantly altered brain wave patterns, particularly enhancing activity in the right hemisphere. When caffeine was given alongside the magnetic field exposure, it appeared to partially counteract some of the brain changes, especially in areas controlling movement.
Unknown authors · 2013
Researchers exposed newly eclosed Drosophila melanogaster to a 50-Hz alternating magnetic field at 1, 11, and 21 G continuously for the first 5 days of adult life. The magnetic field decreased reproductive capacity by up to 4.3%, with the effect increasing at higher field intensities. The decline in reproductive capacity was attributed to severe DNA fragmentation and cell death in reproductive cells, detected by TUNEL assay during early and mid-oogenesis. The increase in DNA damage was more significant than the corresponding decrease in reproductive capacity (up to ~7.5%).
Bai WF, Xu WC, Feng Y, Huang H, Li XP, Deng CY, Zhang MS. · 2013
Researchers divided rat bone marrow stromal cells into three groups: one treated with electromagnetic fields, one induced without fields, and a control group. The cells in the EMF group expressed neuron-specific markers and genes, formed synaptic junctions, and pulsed excitatory postsynaptic currents. The researchers suggested that EMF appears to be a promising clinical option for stem cell transplantation therapies to combat central nervous system diseases.
Balassa T et al. · 2013
Researchers exposed rats to extremely low-frequency magnetic fields (0.5 and 3 mT, 50 Hz) during two critical periods of brain development: in utero during the second gestation week, or as newborns for 7 days starting 3 days after birth. Basic excitability of hippocampal slices was increased by both the fetal 0.5 mT and the newborn 3 mT treatments. Fetal exposure significantly inhibited paired-pulse depression and significantly decreased the efficacy of long-term potentiation induction in the neocortex, but not in the hippocampus. Neonatal treatment had no significant effect on plasticity phenomena.
Calabrò E et al. · 2013
Researchers used SH-SY5Y neuroblastoma cells as an experimental model to study the effects of a 50 Hz electromagnetic field in the range from 50 µT to 1.4 mT. Fourier transform infrared spectroscopy analysis showed a reduction in intensity of the amide A band and a slight increase of vibration bands corresponding to methylene groups. Exposure to a 50 Hz electromagnetic field higher than 0.8 mT was associated with a significant reduction of cell viability and reduced mitochondrial transmembrane potential.
Deng Y, Zhang Y, Jia S, Liu J, Liu Y, Xu W, Liu L. · 2013
Researchers divided sixty male SPF Kunming mice into four groups: a control group, an ELF-MF group exposed at 2 mT for 4 hours per day, a group given aluminum at 200 mg per kg, and a combined ELF-MF plus aluminum group. After 8 weeks of treatment, all three exposure groups showed learning memory impairment, with prolonged escaping latency to the platform and a reduced percentage of time in the platform quadrant in the Morris water maze task. All three exposed groups showed a statistically significant decrease in superoxide dismutase activity and an increase in malondialdehyde levels. The combined ELF-MF plus aluminum treatment induced no more damage than ELF-MF and aluminum did separately.
Duan Y, Wang Z, Zhang H, He Y, Lu R, Zhang R, Sun G, Sun X. · 2013
Researchers investigated whether lotus seedpod procyanidins (LSPCs) given by oral gavage could protect mice from cognitive deficits and oxidative damage caused by extremely low frequency electromagnetic field (ELF-EMF) exposure at 50 Hz and 8 mT for 28 days. A water maze test indicated that learning and memory abilities of the ELF-EMF group deteriorated significantly compared with the control group, but the ELF-EMF + LSPCs90 group had remarkably improved learning and memory abilities compared with the ELF-EMF group. ELF-EMF exposure was associated with significant increases in oxidative stress markers and decreases in antioxidant enzyme activities.
Manjhi J, Kumar S, Behari J, Mathur R. · 2013
Researchers studied whether extremely low frequency (ELF) magnetic field exposure could reduce osteoporosis caused by spinal cord injury in rats. Adult male Wistar rats (n = 24) were equally divided into sham, SCI, and SCI+MF groups. Starting one day after injury, the exposed group received ELF magnetic field at 17.96 micro-Tesla and 50 Hz for two hours per day over eight weeks. Bone mineral content, bone mineral density, and biochemical markers were significantly lower in spinal cord injury rats compared with the sham group, and these decreases were attenuated in the magnetic field-treated group, except for carbon content.
Park JE, Seo YK, Yoon HH, Kim CW, Park JK, Jeon S · 2013
Researchers treated human bone marrow derived mesenchymal stem cells (hBM-MSCs) with ELF-EMF at 50 Hz and 1 mT and measured neural marker expression and cell signaling. The expression of neural markers NF-L, MAP2, and NeuroD1 increased at 6 days, while phosphorylation of Akt and CREB, but not ERK, increased at 90 min. The researchers suggest that EMF induces neural differentiation through activation of EGFR signaling and mild generation of reactive oxygen species (ROS).
Balassa T et al. · 2013
Researchers exposed developing rats to 50 Hz magnetic fields (the same frequency as power lines) during critical brain development periods and found lasting changes in brain function. The exposed animals showed altered electrical activity in brain regions responsible for learning and memory, with some changes persisting weeks after exposure ended. This suggests that magnetic field exposure during early development may affect how the brain processes information later in life.
Duan Y, Wang Z, Zhang H, He Y, Lu R, Zhang R, Sun G, Sun X. · 2013
Researchers exposed mice to 50 Hz magnetic fields (the type from power lines) for 28 days and found it damaged their learning, memory, and brain cells through oxidative stress. When mice were given lotus seedpod antioxidants during exposure, these harmful effects were largely prevented. This suggests that extremely low frequency EMF exposure can cause measurable brain damage, but antioxidants may offer some protection.
Azanza MJ et al. · 2013
Azanza MJ et al. · 2013
Researchers exposed pairs of snail neurons to weak 50 Hz magnetic fields (similar to power line frequencies) to see if the fields could synchronize their electrical activity. They found that magnetic fields between 0.2 and 150 Gauss could indeed cause the neurons to fire in synchronized patterns, with stronger fields sometimes disrupting this synchronization. This suggests that extremely low frequency magnetic fields can directly influence how nerve cells communicate with each other.
Li L, Xiong DF, Liu JW, Li ZX, Zeng GC, Li HL. · 2013
Researchers tested cognitive and brain function in 310 Chinese electrical workers regularly exposed to power line electromagnetic fields during equipment inspections, comparing them to 300 unexposed office workers. The study found no differences in memory, reaction time, or other brain performance measures between the two groups. This suggests that occupational exposure to power frequency electromagnetic fields may not impair basic cognitive abilities.
Bułdak RJ et al. · 2012
Researchers assessed how cisplatin and an extremely low frequency electromagnetic field (ELF-EMF) affected antioxidant enzyme activity, lipid peroxidation, DNA damage, and reactive oxygen species (ROS) production in AT478 carcinoma cells. Cells were cultured with cisplatin for 24 and 72 hours and irradiated with 50 Hz/1 mT ELF-EMF for 16 minutes using a solenoid. When ELF-EMF was combined with cisplatin, ROS levels, antioxidant enzyme activity, and DNA damage all decreased compared to cisplatin alone, but ELF-EMF by itself increased DNA damage relative to control cells.
Cui Y, Ge Z, Rizak JD, Zhai C, Zhou Z, Gong S, Che Y. · 2012
Researchers examined the effects of extremely low frequency magnetic field (ELF-MF) exposure on learning in mice using two water maze tasks. ELF-MF exposure at 1 mT, 50 Hz was associated with oxidative stress in the hippocampus and striatum, and impaired both spatial learning and habit learning. The study provides evidence for an association between impaired learning and oxidative stress in the hippocampus and striatum induced by ELF-MF exposure.
Cui Y, Ge Z, Rizak JD, Zhai C, Zhou Z, Gong S, Che Y. · 2012
Researchers exposed mice to power line frequency magnetic fields for 4 hours daily over 12 weeks. The exposed mice showed impaired learning and memory abilities, plus brain damage from oxidative stress. This suggests household electrical fields may affect cognitive function.
Cui Y, Ge Z, Rizak JD, Zhai C, Zhou Z, Gong S, Che Y. · 2012
Researchers exposed mice to magnetic fields from power lines and appliances, then tested their learning abilities. The exposed mice showed significant learning problems and brain cell damage in memory regions, suggesting everyday electromagnetic fields may harm brain function.
Cho SI et al. · 2012
Researchers designed the study to confirm that extremely low-frequency magnetic fields affect neuronal NOS in several brain regions and to investigate the correlation between nitric oxide and nNOS activation. Exposure of rats to a 2 mT, 60 Hz ELF-MF for 5 days resulted in increases of nitric oxide levels in parallel with cGMP elevations in the cerebral cortex, striatum, and hippocampus. The numbers of nNOS-immunoreactive neurons were significantly increased in those cerebral areas in ELF-MF-exposed rats. Staining and electron microscopy showed no significant differences in the morphology or number of neurons in the cerebral cortex, striatum, and hippocampus.
Cho SI et al. · 2012
Researchers exposed rats to 60 Hz magnetic fields (like those from power lines) for five days and found increased nitric oxide production in key brain regions. While brain structure remained normal, the biochemical changes suggest power-frequency magnetic fields can alter brain chemistry and potentially affect neurological function.
