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Bioelectromagnetics

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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
#1
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...
November 1, 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
#2
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...
October 29, 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
#3
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...
October 23, 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
#4
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...
October 16, 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
#5
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...
October 5, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30367825/issue-information-page
#6
(no author information available yet)
No abstract text is available yet for this article.
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30334586/dealing-with-crosstalk-in-electromagnetic-field-measurements-of-portable-devices
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/30260490/effect-of-magnetic-field-on-in-vitro-seedling-growth-and-shoot-regeneration-from-cotyledon-node-explants-of-lathyrus-chrysanthus-boiss
#11
Anzel Bahadir, Ramazan Beyaz, Mustafa Yildiz
The stimulatory effects on germination of seeds and growth of plants of static magnetic field (MF) pre-treatments depending on MF intensity, exposure time periods, signal form, flux density, and source frequencies on plants are reported. Seed germination frequency is low due to dormancy in Lathyrus chrysanthus Boiss. from Fabaceae family, consisting of 187 taxa. Tissue culture protocol for this plant has already been optimized. This plant is also used as a model for developing alternative methods to overcome dormancy...
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30091796/characterization-of-the-suppressive-effects-of-extremely-low-frequency-electric-fields-on-a-stress-induced-increase-in-the-plasma-glucocorticoid-level-in-mice
#12
Takuya Hori, Takaki Nedachi, Hiroshi Suzuki, Shinji Harakawa
We recently suggested that an increase in the plasma glucocorticoid (GC) level in immobilized mice is suppressed by a 50-Hz electric field (EF) in an EF strength-dependent manner. The present study aimed to assess the anti-stress effect of EFs in three scenarios: exposure to an EF of either 50 or 60 Hz, which are the standard power frequencies in most regions; varying levels of environmental brightness during EF exposure; complete or partial shielding of the mouse from the EF. We compared the GC levels and blood parameters among control, EF-alone, immobilization-alone, and co-treatment groups...
October 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/30091795/ataxia-telangiectasia-mutated-deficiency-does-not-result-in-genetic-susceptibility-to-50-hz-magnetic-fields-exposure-in-mouse-embryonic-fibroblasts
#13
Chuan Sun, Xiaoxia Wei, Aziguli Yimaer, Zhengping Xu, Guangdi Chen
Extremely low frequency magnetic field (ELF-MF) has been classified as a possible carcinogen to humans by the International Agency for Research on Cancer [2002]. However, debate on the genotoxic effects of ELF-MF has continued due to lack of sufficient experimental evidence. Ataxia telangiectasia mutated (ATM) plays a central role in DNA damage repair; its deficiency can result in cellular sensitivity to DNA-damaging agents. To evaluate the genotoxicity of ELF-MF, we investigated the effects of 50 Hz MF on DNA damage in ATM-proficient (Atm+/+ ) mouse embryonic fibroblasts (MEFs) and ATM-deficient (Atm-/- ) MEFs, a radiosensitive cell line...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29984850/the-interphase-interval-within-a-bipolar-nanosecond-electric-pulse-modulates-bipolar-cancellation
#14
Chris M Valdez, Ronald Barnes, Caleb C Roth, Erick Moen, Bennett Ibey
Nanosecond electric pulse (nsEP) exposure generates an array of physiological effects. The extent of these effects is impacted by whether the nsEP is a unipolar (UP) or bipolar (BP) exposure. A 600 ns pulse can generate 71% more YO-PRO-1 uptake compared to a 600 ns + 600 ns pulse exposure. This observation is termed "bipolar cancellation" (BPC) because despite the BP nsEP consisting of an additional 600 ns pulse, it generates reduced membrane perturbation. BPC is achieved by varying pulse amplitudes, and symmetrical and asymmetric pulse widths...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29984845/nanosecond-pulsed-electric-field-exposure-does-not-induce-the-unfolded-protein-response-in-adult-human-dermal-fibroblasts
#15
Stacey L Martens, Caleb C Roth, Bennett L Ibey
Cell-circuit models have suggested that nanosecond pulsed electric fields (nsPEFs) can disrupt intracellular membranes including endoplasmic reticulum (ER), mitochondria, and/or nucleus thereby inducing intrinsic apoptotic pathways. Therefore, we hypothesized that the unfolded protein response (UPR) would be activated, due to the fluctuations of ionic concentrations, upon poration of the ER membrane. Quantitative real-time polymerase chain reaction was utilized to measure changes in messenger RNA (mRNA) expression of specific ER stress genes in adult human dermal fibroblast (HDFa) cells treated with tunicamycin (TM) (known ER stress inducer) and cells exposed to nsPEFs (100, 10-ns pulses at 150 kV/cm delivered at a repetition rate of 1 Hz)...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29873401/effects-of-large-gradient-high-magnetic-field-lg-hmf-on-the-long-term-culture-of-aquatic-organisms-planarians-example
#16
Hui-Meng Lu, Xiao-Li Lu, Jia-Hui Zhai, Ren-Bin Zhou, Yong-Ming Liu, Wei-Hong Guo, Chen-Yan Zhang, Peng Shang, Da-Chuan Yin
Large gradient high magnetic field (LG-HMF) is a powerful tool to study the effects of altered gravity on organisms. In our study, a platform for the long-term culture of aquatic organisms was designed based on a special superconducting magnet with an LG-HMF, which can provide three apparent gravity levels (µ g, 1 g, and 2 g), along with a control condition on the ground. Planarians, Dugesia japonica, were head-amputated and cultured for 5 days in a platform for head reconstruction. After planarian head regeneration, all samples were taken out from the superconducting magnet for a behavioral test under geomagnetic field and normal gravity conditions...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29870083/dose-response-study-for-the-highly-aggressive-and-metastatic-primary-f3ii-mammary-carcinoma-under-direct-current
#17
Maraelys M González, Dasha F Morales, Luis E B Cabrales, Daniel J Pérez, Juan I Montijano, Antonio R S Castañeda, Victoriano G S González, Oscar O Posada, Janet A Martínez, Arlem G Delgado, Karina G Martínez, Mayrel L Mon, Kalet L Monzón, Héctor M C Ciria, Emilia O Beatón, Soraida C A Brooks, Tamara R González, Manuel V Jarque, Miguel A Ó Mateus, Jorge L G Rodríguez, Enaide M Calzado
Electrochemical treatment has been suggested as an effective alternative to local cancer therapy. Nevertheless, its effectiveness decreases when highly aggressive primary tumors are treated. The aim of this research was to understand the growth kinetics of the highly aggressive and metastatic primary F3II tumor growing in male and female BALB/c/Cenp mice under electrochemical treatment. Different amounts of electric charge (6, 9, and 18 C) were used. Two electrodes were inserted into the base, perpendicular to the tumor's long axis, keeping about 1 cm distance between them...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29869805/sar-investigations-on-the-exposure-compliance-of-wearable-wireless-devices-using-infrared-thermography
#18
Varshini Karthik, T Rama Rao
Wearable electronics have become the norm over the last few years. Extensive use of wearable wireless devices (WWD) in greater proximity to the body has increased concern about potential biological effects due to the interaction of human tissues with electromagnetic (EM) fields. Human tissues absorb radiofrequency (RF) waves that are capable of affecting energy states at a molecular level, leading to unsafe effects. Remarkably, thermal effect due to the absorption of RF waves is a better biological manifestation than traditional specific absorption rate (SAR) values...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29797587/effects-of-combined-magnetic-fields-on-bacteria-rhodospirillum-rubrum-vkm-b-1621
#19
Galina Khokhlova, Tatiana Abashina, Nataliya Belova, Victor Panchelyuga, Alexey Petrov, Fernanda Abreu, Mikhail Vainshtein
Bacteria are the simplest model of living organisms and thus are a convenient object for magnetobiological research. This paper describes some effects of combined magnetic fields (CMFs) on the bacterium Rhodospirillum rubrum strain VKM B-1621, which is not a pathogen but was selected due to its wide spectrum of growth abilities. The authors chose magnetic field-resonant phosphorus and iron (Fe3+ ) because P-containing biochemical compounds (standard abbreviations PP1 , AMP, ADP, ATP) provide energy flows in bacteria while iron could take part in formation of magnetosensitive intracellular inclusions...
September 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29719057/the-antitumor-effect-of-static-and-extremely-low-frequency-magnetic-fields-against-nephroblastoma-and-neuroblastoma
#20
Lin-Qing Yuan, Can Wang, Kun Zhu, Hua-Mei Li, Wei-Zhong Gu, Dong-Ming Zhou, Jia-Qi Lai, Duo Zhou, Yao Lv, Santi Tofani, Xi Chen
Certain magnetic fields (MF) have potential therapeutic antitumor effect whereas the underlying mechanism remains undefined. In this study, a well-characterized MF was applied to two common childhood malignancies, nephroblastoma and neuroblastoma. This MF has a time-averaged total intensity of 5.1 militesla (mT), and was generated as a superimposition of a static and an extremely low frequency (ELF) MF in 50 Hertz (Hz). In nephroblastoma and neuroblastoma cell lines including G401, CHLA255, and N2a, after MF exposure of 2 h per day, the cell viability decreased significantly after 2 days...
July 2018: Bioelectromagnetics
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