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Bioelectromagnetics

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https://www.readbyqxmd.com/read/30615800/post-normal-science-and-the-management-of-uncertainty-in-bioelectromagnetic-controversies
#1
Andrew W Wood
No abstract text is available yet for this article.
January 7, 2019: Bioelectromagnetics
https://www.readbyqxmd.com/read/30537234/50-hz-mf-does-not-affect-global-dna-methylation-of-sh-sy5y-cells-treated-with-the-neurotoxin-mpp
#2
Barbara Benassi, Stefania Santangeli, Caterina Merla, Letizia Tarantini, Valentina Bollati, Alessio Butera, Carmela Marino, Claudia Consales
Exposure to extremely low frequency magnetic fields (ELF-MFs) has been associated with an increased risk of neurodegenerative disorders. The underlying mechanisms, however, are still debated. Since epigenetics play a key role in the neurodegenerative process, we investigated whether exposure to ELF-MF (50 Hz, 1 mT) might affect global DNA methylation of SH-SY5Y dopaminergic-like neuroblastoma cells. We assessed the percentage of 5-methylcytosine (5-mC) of three repetitive interspersed sequences (ALU, LINE-1, or SATα), through pyrosequencing analysis...
December 7, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30476358/an-empirical-formula-for-temperature-adjustment-of-complex-permittivity-of-human-skin-in-the-terahertz-frequencies
#3
LETTER
Zoltan Vilagosh, Alireza Lajevardipour, Andrew Wood
No abstract text is available yet for this article.
November 26, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30476352/hypomagnetic-fields-cause-anxiety-in-adult-male-mice
#4
Hai-Min Ding, Xue Wang, Wei-Chuan Mo, Ling-Ling Qin, Steven Wong, Jing-Peng Fu, Yan Tan, Ying Liu, Rong-Qiao He, Qian Hua
Hypomagnetic fields (HMF), that is, the elimination of the geomagnetic field (GMF), are a risk factor to the health of astronauts in outer space. It has been established that continuous HMF exposure affects cytoskeleton assembly, cell proliferation, embryonic development, and even learning and memory. In addition, although there were some previous studies that focused on the effects of long-term HMF-exposure, so far very limited investigations have been conducted to examine the short-term HMF effect in animals...
November 26, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30466197/high-voltage-electrostatic-field-induced-oxidative-stress-characterization-of-the-physiological-effects-in-sitobion-avenae-hemiptera-aphididae-across-multiple-generations
#5
Kun Luo, Chen Luo, Guangyu Li, Xinjian Yao, Rui Gao, Zuqing Hu, Gaisheng Zhang, Huiyan Zhao
In recent decades, man-made electric fields have greatly increased the intensity of electrostatic fields that are pervasively present in the environment. To better understand the physiological alterations exhibited by herbivorous insects in response to changing electric environments, we determined the activities of anti-oxidative enzymes and the metabolic rate of Sitobion avenae Fabricius (Hemiptera: Aphididae) over multiple generations in response to direct and host-seed exposure to a high-voltage electrostatic field (HVEF) of varying strength for different durations...
November 22, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30466173/effects-of-7-t-static-magnetic-fields-on-the-expression-of-biological-markers-and-the-formation-of-bone-in-rats
#6
Sachiko Yamaguchi-Sekino, Tsutomu Kira, Masaki Sekino, Manabu Akahane
In this study, we aimed to evaluate the effects of 7 T static magnetic fields (SMFs) on rat mesenchymal stem cells (MSCs) in order to determine whether strong SMFs affected the osteogenesis of MSCs. MSCs were prepared from bone marrow cells obtained from the femurs of 7-week-old male Fischer 344 rats. MSCs were then combined with β-tricalcium phosphate (β-TCP), yielding two types of TCP/MSC constructs (TCP/P-1 and P-2) on day 0. Exposure was performed for 3 h/day for 6 days, and the experiments were performed twice using different exposure apparatus (cryovials or 4-well chambers) for each experiment...
November 22, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30562416/modulation-of-resting-state-brain-functional-connectivity-by-exposure-to-acute-fourth-generation-long-term-evolution-electromagnetic-field-an-fmri-study
#7
Yiwen Wei, Jiayi Yang, Zhiye Chen, Tongning Wu, Bin Lv
By now, the neurophysiological effect of electromagnetic field (EMF) exposure and its underlying regulating mechanisms are not well manifested. In this study, we aimed to investigate whether acute long-term evolution (LTE) EMF exposure could modulate brain functional connectivity using regional homogeneity (ReHo) method and seed-based analysis on resting-state functional magnetic resonance imaging (fMRI). We performed the LTE-EMF exposure experiment and acquired the resting-state brain activities before and after EMF exposure...
January 2019: Bioelectromagnetics
https://www.readbyqxmd.com/read/30562415/biological-effects-of-static-magnetic-fields-and-zinc-isotopes-on-e-coli-bacteria
#8
Ulyana G Letuta, Vitaly L Berdinskiy
The sensitivity of intracellular enzymatic systems to static magnetic fields (SMFs) and magnetic isotopes has been shown both in vitro and in vivo. These effects are determined by the spin-dependent magnetosensitive stages of enzymatic reactions. The search for experimental evidence of the combined effect of SMFs and zinc magnetic isotope 67 Zn on the intracellular processes on Escherichia coliEscherichia coli bacteria has taken place in vivo. The joint effects of external SMFs and magnetic zinc isotope 67 Zn on vital functions of E...
January 2019: Bioelectromagnetics
https://www.readbyqxmd.com/read/30500987/emf-exposure-variation-among-mri-sequences-from-pediatric-examination-protocols
#9
Jennifer Frankel, Kjell Hansson Mild, Johan Olsrud, Jonna Wilén
The magnetic resonance imaging (MRI) exposure environment is unique due to the mixture and intensity of magnetic fields involved. Current safety regulations are based on well-known acute effects of heating and neuroexcitation while the scientific grounds for possible long-term effects from MRI exposure are lacking. Epidemiological research requires careful exposure characterization, and as a first step toward improved exposure assessment we set out to characterize the MRI-patient exposure environment. Seven MRI sequences were run on a 3-Tesla scanner while the radiofrequency and gradient magnetic fields were measured inside the scanner bore...
January 2019: Bioelectromagnetics
https://www.readbyqxmd.com/read/30462847/editorial
#10
EDITORIAL
James Lin
No abstract text is available yet for this article.
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30462846/the-effects-of-electromagnetic-fields-on-cultured-human-retinal-pigment-epithelial-cells
#11
Niyousha Nasrabadi, Zahra-Soheila Soheili, Abouzar Bagheri, Hamid Ahmadieh, Yashar Amizadeh, Farzin Sahebjam, Faraj Tabeie, Mozhgan Rezaei Kanavi
A great deal of evidence has confirmed that electromagnetic fields (EMFs) can affect the central nervous system. In this study, cultured neonatal human retinal pigment epithelial (hRPE) cells were exposed to pulsed EMF of 1 mT intensity and 50 Hz frequency 8 h daily for 3 days. In addition to cell proliferation and cell death assays, immunocytochemistry for RPE65, PAX6, nestin, and cytokeratin 8/18 proteins were performed. Real-time reverse transcriptase polymerase chain reaction (RT-PCR) was performed for NES, PAX6, RPE65, and ACTA2 gene expression...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30383885/theoretical-and-numerical-assessment-of-maximally-allowable-power-density-averaging-area-for-conservative-electromagnetic-exposure-assessment-above-6-ghz
#12
Esra Neufeld, Eduardo Carrasco, Manuel Murbach, Quirino Balzano, Andreas Christ, Niels Kuster
The objective of this paper is to determine a maximum averaging area for power density (PD) that limits the maximum temperature increase to a given threshold for frequencies above 6 GHz. This maximum area should be conservative for any transmitter at any distance >2 mm from the primary transmitting antennas or secondary field-generating sources. To derive a generically valid maximum averaging area, an analytical approximation for the peak temperature increase caused by localized exposure was derived...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30371954/synergistic-effect-of-rice-bran-extract-and-extremely-low-frequency-electromagnetic-fields-on-dermal-papilla-melanocytes-in-melanogenesis
#13
Soon-Joung Kwon, Yu-Mi Kim, Hyun-Jun Jang, Young-Kwon Seo
Melanocytes in hair are located around dermal papilla cells at the tip of the hair follicle. In this study, we examined the melanogenesis of a three-dimensional (3D) hair dermal papilla model treated with natural extracts and electromagnetic fields (EMFs). The 3D model involved dermal papilla-like tissue (DPLT), an aggregation of a mixture of dermal papilla cells, and melanocytes in microwells. Rice bran extract (RBE), an EMF, and RBE/EMF were applied to different DPLT groups. The LDH assay indicated no cell stress in all experimental groups, and detection of tyrosinase activity demonstrated high activity in the RBE/EMF group...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30350869/pulsed-electromagnetic-fields-prevented-the-decrease-of-bone-formation-in-hindlimb-suspended-rats-by-activating-sac-camp-pka-creb-signaling-pathway
#14
Wen-Yuan Li, Xue-Yan Li, Yong-Hui Tian, Xin-Ru Chen, Jian Zhou, Bao-Ying Zhu, Hui-Rong Xi, Yu-Hai Gao, Cory J Xian, Ke-Ming Chen
Microgravity is one of the main threats to the health of astronauts. Pulsed electromagnetic fields (PEMFs) have been considered as one of the potential countermeasures for bone loss induced by space flight. However, the optimal therapeutic parameters of PEMFs have not been obtained and the action mechanism is still largely unknown. In this study, a set of optimal therapeutic parameters for PEMFs (50 Hz, 0.6 mT 50% duty cycle and 90 min/day) selected based on high-throughput screening with cultured osteoblasts was used to prevent bone loss in rats induced by hindlimb suspension, a commonly accepted animal model to simulate the space environment...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30328127/effect-of-low-level-1800-mhz-radiofrequency-radiation-on-the-rat-sciatic-nerve-and-the-protective-role-of-paricalcitol
#15
Ulku Comelekoglu, Savas Aktas, Burcu Demirbag, Meryem Ilkay Karagul, Serap Yalin, Metin Yildirim, Aysegul Akar, Begum Korunur Engiz, Fatma Sogut, Erkan Ozbay
The nervous system is an important target of radiofrequency (RF) radiation exposure since it is the excitable component that is potentially able to interact with electromagnetic fields. The present study was designed to investigate the effects of 1,800 MHz RF radiation and the protective role of paricalcitol on the rat sciatic nerve. Rats were divided into four groups as control, paricalcitol, RF, and RF + paricalcitol. In RF groups, the rats were exposed to 1,800 MHz RF for 1 h per day for 4 weeks...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30289993/custom-edge-element-fem-solver-and-its-application-to-eddy-current-simulation-of-realistic-2m-element-human-brain-phantom
#16
Wuliang Yin, Mingyang Lu, Jiawei Tang, Qian Zhao, Zhijie Zhang, Kai Li, Yan Han, Anthony Peyton
Extensive research papers of three-dimensional computational techniques are widely used for the investigation of human brain pathophysiology. Eddy current analyzing could provide an indication of conductivity change within a biological body. A significant obstacle to current trend analyses is the development of a numerically stable and efficiency-finite element scheme that performs well at low frequency and does not require a large number of degrees of freedom. Here, a custom finite element method (FEM) solver based on edge elements is proposed using the weakly coupled theory, which separates the solution into two steps...
December 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30334586/dealing-with-crosstalk-in-electromagnetic-field-measurements-of-portable-devices
#17
Marloes Eeftens, Benjamin Struchen, Katharina Roser, Marco Zahner, Jürg Fröhlich, Martin Röösli
Portable devices measuring radiofrequency electromagnetic fields (RF-EMF) are affected by crosstalk: signals originating in one frequency band that are unintentionally registered in another. If this is not corrected, total exposure to RF-EMF is biased, particularly affecting closely spaced frequency bands such as GSM 1800 downlink (1,805-1,880 MHz), DECT (1,880-1,900 MHz), and UMTS uplink (1,920-1,980 MHz). This study presents an approach to detect and correct crosstalk in RF-EMF measurements, taking into account the real-life setting in which crosstalk is intermittently present, depending on the exact frequency of the signal...
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30307039/evaluation-of-occupational-exposure-to-static-magnetic-field-in-mri-sites-based-on-body-pose-estimation-and-smf-analytical-computation
#18
Lamia Belguerras, A Rahim Kadkhodamohammadi, Antoine Delmas, Meysam Miralipoor, Nicolas Weber, Afshin Gangi, Jacques Felblinger, Nicolas Padoy, Cédric Pasquier
This paper tackles the problem of estimating exposure to static magnetic field (SMF) in magnetic resonance imaging (MRI) sites using a non-invasive approach. The proposed approach relies on a vision-based system to detect people's body parts and on a mathematical model to compute SMF exposure. A multi-view camera system was used to capture the MRI room, and a vision-based system was applied to detect body parts. The detected localization was then fed into a mathematical model to compute SMF exposure. In this study, we focused on exposure at the neck due to two main reasons...
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30303544/some-recommendations-for-experimental-work-in-magnetobiology-revisited
#19
LETTER
Leonardo Makinistian, David J Muehsam, Ferdinando Bersani, Igor Belyaev
No abstract text is available yet for this article.
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30289990/the-effect-of-20-week-continuous-60-hz-magnetic-field-exposure-on-testicular-function-in-sprague-dawley-rats
#20
Sungman Park, Young-Jin Kim, Min Soo Kim, Hee-Sung Kim, Min-Woo Kim, Yeon-Mi Kang, Sang-Kon Lee, Kyoung-Chan Choi, Nam Kim, Youn-Myoung Gimm, Yoon-Won Kim
Accumulating evidence does not yet confirm the effect of power line frequency magnetic field (MF) on human health and fertility. We recently reported that, at continuous 60 Hz MF exposure in mice, the dose given as magnetic flux density (tesla; T) and duration of exposure was related to induce testicular germ cell apoptosis. We aimed to characterize the effect of a 20-week continuous exposure to 60 Hz MF on the motility, morphology, and number of sperm as well as the apoptosis of testicular germ cell in rats...
October 2018: Bioelectromagnetics
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