2,515 results match your criteria Bioelectromagnetics[Journal]


A Resonant System for In Vitro Studies Emulating Wireless Power Transfer Exposure at 13.56 MHz.

Bioelectromagnetics 2020 May 25. Epub 2020 May 25.

CNRS, IETR (Institut d'Électronique et de Télécommunication de Rennes), University of Rennes, Rennes, France.

This paper presents the design of a resonant system for in vitro studies to emulate the exposure of a monolayer of cells to a wireless power transfer system operating at 13.56 MHz. The design procedure targets a system, which maximizes the specific absorption rate (SAR) uniformity on the plane where the layer is cultured, as well as SAR efficiency (defined as SAR over the input power), within the size constraints of a standard incubator. Read More

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http://dx.doi.org/10.1002/bem.22270DOI Listing

Low-Frequency Magnetic Fields in Cars and Office Premises and the Geomagnetic Field Variations.

Bioelectromagnetics 2020 May 20. Epub 2020 May 20.

Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia.

In this study, we measured and analyzed the spectral characteristics of a low-frequency magnetic field (MF) inside several gasoline-powered cars while driving on busy city roads. The spectra obtained upon measurements in the interior of the cars are compared with those measured in office locations at different times of the day and with different disturbances of the geomagnetic field (k-index of disturbance 2-8). The power spectral density of the electromagnetic field in cars moving on busy roads in the frequency range of 10 -10  Hz is one to three orders of magnitude higher than that in urban offices. Read More

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http://dx.doi.org/10.1002/bem.22269DOI Listing

Limitations of Incident Power Density as a Proxy for Induced Electromagnetic Fields.

Bioelectromagnetics 2020 May 14. Epub 2020 May 14.

IT'IS Foundation, Zürich, Switzerland.

The most recent safety guidelines define basic restrictions for electromagnetic field exposure at frequencies more than 6 GHz in terms of spatial- and time-averaged transmitted power density inside the body. To enable easy-to-perform evaluations in situ, the reference levels for the incident power density were derived. In this study, we examined whether compliance with the reference levels always ensures compliance with basic restrictions. Read More

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http://dx.doi.org/10.1002/bem.22268DOI Listing

Setting Guidelines for Electromagnetic Exposures and Research Needs.

Bioelectromagnetics 2020 Apr 20. Epub 2020 Apr 20.

Department of Physics, University of Wisconsin-Parkside, Kenosha, Wisconsin.

Current limits for exposures to nonionizing electromagnetic fields (EMF) are set, based on relatively short-term exposures. Long-term exposures to weak EMF are not addressed in the current guidelines. Nevertheless, a large and growing amount of evidence indicates that long-term exposure to weak fields can affect biological systems and might have effects on human health. Read More

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http://dx.doi.org/10.1002/bem.22267DOI Listing

The Influence of Changes in Magnetic Variations and Light-Dark Cycle on Life-History Traits of Daphnia magna.

Bioelectromagnetics 2020 Apr 15. Epub 2020 Apr 15.

I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Russia.

Day-night cycle is the main zeitgeber (time giver) for biological circadian rhythms. Recently, it was suggested that natural diurnal geomagnetic variation may also be utilized by organisms for the synchronization of these rhythms. In this study, life-history traits in Daphnia magna were evaluated after short-term and multigenerational exposure to 16 h day/8 h night cycle, 32 h day/16 h night cycle, diurnal geomagnetic variation of 24 h, simulated magnetic variation of 48 h, and combinations of these conditions. Read More

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http://dx.doi.org/10.1002/bem.22264DOI Listing

Pulsed Electromagnetic Field Versus Whole Body Vibration on Cartilage and Subchondral Trabecular Bone in Mice With Knee Osteoarthritis.

Bioelectromagnetics 2020 May 10;41(4):298-307. Epub 2020 Apr 10.

Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, People's Republic of China.

Pulsed electromagnetic field (PEMF) and whole body vibration (WBV) interventions are expected to be important strategies for management of osteoarthritis (OA). The aim of the study was to investigate the comparative effectiveness of PEMF versus WBV on cartilage and subchondral trabecular bone in mice with knee OA (KOA) induced by surgical destabilization of the medial meniscus (DMM). Forty 12-week-old male C57/BL mice were randomly divided into four groups (n = 10): Control, OA, PEMF, and WBV. Read More

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http://dx.doi.org/10.1002/bem.22263DOI Listing

Low-Frequency Magnetic Field of Appropriate Strengths Changed Secondary Metabolite Production and Na Concentration of Intracellular and Extracellular Monascus purpureus.

Bioelectromagnetics 2020 May 27;41(4):289-297. Epub 2020 Mar 27.

College of Life Science, Yangtze University, Jingzhou, China.

Monascus purpureus is used to yield edible pigments accompanied by mycotoxin-citrinin. A low-frequency (<300 Hz) magnetic field (LF-MF) affects microbial metabolism. The link of LF-MF with secondary metabolites and intracellular and extracellular Na levels in M. Read More

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http://dx.doi.org/10.1002/bem.22262DOI Listing
May 2020
1.705 Impact Factor

Distribution of AC Electric Field-Induced Transmembrane Voltage in Escherichia coli Cell Wall Layers.

Bioelectromagnetics 2020 May 24;41(4):279-288. Epub 2020 Mar 24.

Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, IMEP-LAHC, 38000, Grenoble, France.

On the basis of Gram-negative bacterium Escherichia coli models previously published in the literature, the transmembrane voltage induced by the application of an alternating current (AC) electric field on a bacterial suspension is calculated using COMSOL Multiphysics software, in the range 1-20 MHz, for longitudinal and transverse field orientations. The voltages developed on each of the three layers of the cell wall are then calculated using an electrical equivalent circuit. This study shows that the overall voltage on the cell wall, whose order of magnitude is a few tens of µV, is mainly distributed on inner and outer layers, while a near-zero voltage is found on the periplasm, due to its much higher electrical conductivity compared with the other layers. Read More

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http://dx.doi.org/10.1002/bem.22261DOI Listing

Effects and Mechanisms of Exogenous Electromagnetic Field on Bone Cells: A Review.

Bioelectromagnetics 2020 May 11;41(4):263-278. Epub 2020 Mar 11.

State Key Laboratory of Trauma, Burns and Combined Injury, Department of Wound Repair and Rehabilitation, Center of Bone Metabolism and Repair, Trauma Center, Research Institute of Surgery, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China.

Osteoporosis, fractures, and other bone diseases or injuries represent serious health problems in modern society. A variety of treatments including drugs, surgeries, physical therapies, etc. have been used to prevent or delay the progression of these diseases/injuries with limited effects. Read More

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http://dx.doi.org/10.1002/bem.22258DOI Listing

Valid Exposure Protocols Needed in Magnetic Resonance Imaging Genotoxic Research.

Bioelectromagnetics 2020 Apr 10;41(3):247-257. Epub 2020 Mar 10.

Department of Radiation Sciences, Radiation Physics, Umeå University, Umeå, Sweden.

Several in vitro and in vivo studies have investigated if a magnetic resonance imaging (MRI) examination can cause DNA damage in human blood cells. However, the electromagnetic field (EMF) exposure that the cells received in the MR scanner was not sufficiently described. The first studies looking into this could be regarded as hypothesis-generating studies. Read More

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http://dx.doi.org/10.1002/bem.22257DOI Listing

Design and Dosimetric Analysis of an Exposure Facility for Investigating Possible Effects of 2.45 GHz Wi-Fi Signals on Human Sleep.

Bioelectromagnetics 2020 Apr 27;41(3):230-240. Epub 2020 Feb 27.

Competence Center of Sleep Medicine, Charité-Universitaetsmedizin, Berlin, Germany.

A new head exposure system for double-blind provocation studies investigating possible effects of 2.45 GHz Wi-Fi exposure on human sleep was developed and dosimetrically analyzed. The exposure system includes six simultaneously radiating directional antennas arranged along a circle (radius 0. Read More

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http://dx.doi.org/10.1002/bem.22256DOI Listing

The Effects of Mobile Phone Radiofrequency Radiation on Cochlear Stria Marginal Cells in Sprague-Dawley Rats.

Bioelectromagnetics 2020 Apr 18;41(3):219-229. Epub 2020 Feb 18.

Department of Otorhinolaryngology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.

To investigate the possible mechanisms for biological effects of 1,800 MHz mobile radiofrequency radiation (RFR), the radiation-specific absorption rate was applied at 2 and 4 W/kg, and the exposure mode was 5 min on and 10 min off (conversation mode). Exposure time was 24 h short-term exposure. Following exposure, to detect cell DNA damage, cell apoptosis, and reactive oxygen species (ROS) generation, the Comet assay test, flow cytometry, DAPI (4',6-diamidino-2-phenylindole dihydrochloride) staining, and a fluorescent probe were used, respectively. Read More

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http://dx.doi.org/10.1002/bem.22255DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7154754PMC

Assessment of Low-Frequency Magnetic Fields Emitted by DC Fast Charging Columns.

Bioelectromagnetics 2020 May 11;41(4):308-317. Epub 2020 Feb 11.

European Commission, Joint Research Center (JRC), Ispra, Italy.

The expected imminent widespread use of electromobility in transport systems draws attention to the possible effects of human exposure to magnetic fields generated inside electric vehicles and during their recharge. The current trend is to increase the capacity of the battery inside the vehicles to extend the available driving range and to increase the power of recharging columns to reduce the time required for a full recharge. This leads to higher currents and potentially stronger magnetic fields. Read More

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http://dx.doi.org/10.1002/bem.22254DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7217217PMC

Effects of Long-Term Exposure to Low-Power 915 MHz Unmodulated Radiation on Phaseolus vulgaris L.

Bioelectromagnetics 2020 Apr 6;41(3):200-212. Epub 2020 Feb 6.

National Institute for Research and Development of Isotopic and Molecular Technologies (INCDTIM), Cluj-Napoca, Romania.

The morphophysiological response of Phaseolus vulgaris L. to low-power electromagnetic radiation was investigated in order to assess the potential harmful effects of long-term continuous exposure. The plants were grown in two separate electromagnetic field (EMF) shielded rooms, in a controlled, greenhouse-like environment. Read More

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http://dx.doi.org/10.1002/bem.22253DOI Listing

Possible Mechanism for Synchronized Detection of Weak Magnetic Fields by Nerve Cells.

Bioelectromagnetics 2020 Apr 28;41(3):213-218. Epub 2020 Jan 28.

Department of Physics, University of Wisconsin-Parkside, Kenosha, Wisconsin.

We propose that biological systems may detect static and slowly varying magnetic fields by the modification of the timing of firing of adjacent nerve cells through the local influence of the magnetic field generated by current from one cell's firing on its nearest neighbors. The time delay of an adjacent nerve cell pulse with respect to the initial clock nerve cell pulse could serve as a signal for sensing the magnitude and direction of the magnetic field in a direction perpendicular to the current flows in the cells. It has been shown that changes in static magnetic fields modify concentrations of reactive oxygen species, calcium, pH, the growth rates of fibrosarcoma cells, and membrane potentials. Read More

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http://dx.doi.org/10.1002/bem.22251DOI Listing

The Relative Permittivity Changes of EGF by 50 Hz MF Exposure Neither Affect the Interaction of EGF With EGFR Nor Its Biological Effects.

Bioelectromagnetics 2020 Apr 17;41(3):241-246. Epub 2020 Jan 17.

Bioelectromagnetics Laboratory, Department of Reproductive Endocrinology of Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China.

The biophysical mechanism of magnetic fields (MFs) acting on living systems is not clear. Previous research showed that, similar to epidermal growth factor (EGF), MF exposure induced EGF receptor (EGFR) clustering and activated EGFR signaling. In this study, we investigated whether MF exposure induced the changes in physical characteristics of EGF and downstream effects of EGF and EGFR interaction. Read More

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http://dx.doi.org/10.1002/bem.22249DOI Listing

The Lack of Toxic Effect of High-Power Short-Pulse 101 GHz Millimeter Waves on Healthy Mice.

Bioelectromagnetics 2020 Apr 17;41(3):188-199. Epub 2020 Jan 17.

Department of Molecular Biology, Ariel University, Ariel, Israel.

Irradiation of cancer cells by non-ionizing millimeter waves (MMW) causes increased cell mortality. We examined if MMW have toxic effects on healthy mice. To that end, the skin of healthy C57BL/6 mice was irradiated locally at the right flank with 101 GHz MMW in a pulsed (5-10 µs) regime using a free electron laser. Read More

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http://dx.doi.org/10.1002/bem.22247DOI Listing

Effect of Pulsed Electromagnetic Fields on Human Mesenchymal Stem Cells Using 3D Magnetic Scaffolds.

Bioelectromagnetics 2020 Apr 15;41(3):175-187. Epub 2020 Jan 15.

Department of Biomedical, Industrial & Human Factors Engineering, Wright State University, Dayton, Ohio.

Alternative bone regeneration strategies that do not rely on harvested tissue or exogenous growth factors are needed. One of the major challenges in tissue reconstruction is recreating the bone tissue microenvironment using the appropriate combination of cells, scaffold, and stimulation to direct differentiation. This study presents a bone regeneration formulation that involves the use of human adipose-derived mesenchymal stem cells (hASCs) and a three-dimensional (3D) hydrogel scaffold based on self-assembled RADA16 peptides containing superparamagnetic iron oxide nanoparticles (NPs). Read More

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http://dx.doi.org/10.1002/bem.22248DOI Listing

Exposure Assessment in Millimeter-Wave Reverberation Chamber Using Murine Phantoms.

Bioelectromagnetics 2020 Feb 13;41(2):121-135. Epub 2020 Jan 13.

Univ Rennes, INSA Rennes, CNRS, IETR-UMR 6164, F-35000 Rennes, France.

This study deals with the design and calibration of the first mode-stirred reverberation chamber (RC) in the 60-GHz-band adapted for in vivo bioelectromagnetic studies. In addition to the interface for electromagnetic and thermal dosimetry, the interfaces for lighting and ventilation were integrated into the RC walls while preserving acceptable shielding. The RC with mechanical and electronic steering capabilities is characterized in the 55-65 GHz range. Read More

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http://dx.doi.org/10.1002/bem.22243DOI Listing
February 2020

Dielectric Properties of Normal and Metastatic Lymph Nodes Ex Vivo From Lung Cancer Surgeries.

Bioelectromagnetics 2020 Feb 8;41(2):148-155. Epub 2020 Jan 8.

School of Medicine, South China University of Technology, Guangzhou, China.

The dielectric properties of normal and tumor human tissues have been widely reported in recent years. However, the dielectric properties of intrathoracic lymph nodes (LNs) have not been reported. In this communication, we measured the dielectric properties (i. Read More

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http://dx.doi.org/10.1002/bem.22246DOI Listing
February 2020

Phantom Model Testing of Active Implantable Cardiac Devices at 50/60 Hz Electric Field.

Bioelectromagnetics 2020 Feb 5;41(2):136-147. Epub 2020 Jan 5.

EDF SEM, Levallois-Perret, France.

Exposure to external extremely low-frequency (ELF) electric and magnetic fields induces the development of electric fields inside the human body, with their nature depending on multiple factors including the human body characteristics and frequency, amplitude, and wave shape of the field. The objective of this study was to determine whether active implanted cardiac devices may be perturbed by a 50 or 60 Hz electric field and at which level. A numerical method was used to design the experimental setup. Read More

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http://dx.doi.org/10.1002/bem.22245DOI Listing
February 2020

Discussion on Spatial and Time Averaging Restrictions Within the Electromagnetic Exposure Safety Framework in the Frequency Range Above 6 GHz for Pulsed and Localized Exposures.

Bioelectromagnetics 2020 Feb 30;41(2):164-168. Epub 2019 Dec 30.

Foundation for Research on Information Technologies in Society (IT'IS), Zurich, Switzerland.

Both the current and newly proposed safety guidelines for local human exposure to millimeter-wave frequencies aim at restricting the maximum local temperature increase in the skin to prevent tissue damage. In this study, we show that the application of the current and proposed limits for pulsed fields can lead to a temperature increase of 10°C for short pulses and frequencies between 6 and 30 GHz. We also show that the proposed averaging area of 4 cm , that is greatly reduced compared with the current limits, does not prevent high-temperature increases in the case of narrow beams. Read More

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http://dx.doi.org/10.1002/bem.22244DOI Listing
February 2020

Ultrasound-Assisted Enzyme-Catalyzed Hydrolysis of Collagen to Produce Peptides With Biomedical Potential: Collagenase From Aspergillus terreus UCP1276.

Bioelectromagnetics 2020 Feb 24;41(2):113-120. Epub 2019 Dec 24.

Department of Morphology and Animal Physiology, Laboratory of Bioactive Products, Federal Rural University of Pernambuco, Recife, Pernambuco, Brazil.

Ultrasound has been applied for varied purposes as it provides additional mechanical energy to a system, and is still profitable and straightforward, which are advantages for industrial applications. In this work, ultrasonic treatments were applied to purified collagenase fractions from a fermented extract by Aspergillus terreus UCP 1276 aiming to evaluate the potential effect on collagen hydrolysis. The physical agent was evaluated as an inductor of collagen degradation and consequently as a producer of peptides with anticoagulant activity. Read More

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http://dx.doi.org/10.1002/bem.22239DOI Listing
February 2020

Perturbing Circadian Oscillations in an In Vitro Suprachiasmatic Nucleus With Magnetic Stimulation.

Bioelectromagnetics 2020 Jan;41(1):63-72

Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, North Carolina.

Many neurological disorders are associated with abnormal oscillatory dynamics. The suprachiasmatic nucleus (SCN) is responsible for the timing and synchronization of physiological processes. We performed experiments on PERIOD2::LUCIFERASE transgenic "knock-in" mice. Read More

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http://dx.doi.org/10.1002/bem.22235DOI Listing
January 2020

Wireless Wearables and Implants: A Dosimetry Review.

Bioelectromagnetics 2020 Jan 18;41(1):3-20. Epub 2019 Dec 18.

ElectroScience Laboratory, Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio.

Wireless wearable and implantable devices are continuing to grow in popularity, and as this growth occurs, so too does the need to consider the safety of such devices. Wearable and implantable devices require the transmitting and receiving of electromagnetic waves near and through the body, which at high enough exposure levels may damage proximate tissues. The specific absorption rate (SAR) is the quantity commonly used to enumerate exposure levels, and various national and international organizations have defined regulations limiting exposure to ensure safe operation. Read More

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http://dx.doi.org/10.1002/bem.22240DOI Listing
January 2020

Gender and Age Differences in the Suppressive Effect of a 50 Hz Electric Field on the Immobilization-Induced Increase of Plasma Glucocorticoid in Mice.

Bioelectromagnetics 2020 Feb 12;41(2):156-163. Epub 2019 Dec 12.

Bio-Self-Regulating Science Laboratory, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.

We developed an experimental system to characterize the suppressive effect of extremely low-frequency (ELF) electric fields (EFs) on the stress response. We assessed differences in the EF effects by age and gender. Control, EF-alone, immobilization-alone, and co-treated groups were subjected to an EF (50 Hz, 10 kV/m). Read More

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http://dx.doi.org/10.1002/bem.22238DOI Listing
February 2020

An Extremely Low Frequency Magnetic Field and Global Cerebral Ischemia Affect Pituitary ACTH and TSH Cells in Gerbils.

Bioelectromagnetics 2020 Feb 11;41(2):91-103. Epub 2019 Dec 11.

Department of Neurophysiology, Institute for Biological Research "Siniša Stanković"-National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia.

The neuroendocrine system can be modulated by a magnetic field and cerebral ischemia as external and internal stressors, respectively. This study deals with the separate or combined effects of an extremely low frequency (ELF) magnetic field (50 Hz, average magnetic field of 0.5 mT) for 7 days and global cerebral ischemia for 10 min on the morpho-functional features of pituitary adrenocorticotrophic (ACTH) and thyrotrophic (TSH) cells in 3-month-old gerbils. Read More

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http://dx.doi.org/10.1002/bem.22237DOI Listing
February 2020

Effect of Exposure to a Radiofrequency Electromagnetic Field on Body Temperature in Anesthetized and Non-Anesthetized Rats.

Bioelectromagnetics 2020 Feb 11;41(2):104-112. Epub 2019 Dec 11.

Department of Neurosurgery, Ajou University School of Medicine, Suwon, Republic of Korea.

Exposure to a radiofrequency (RF) signal at a specific absorption rate (SAR) of 4 W/kg can increase the body temperature by more than 1 °C. In this study, we investigated the effect of anesthesia on the body temperature of rats after exposure to an RF electromagnetic field at 4 W/kg SAR. We also evaluated the influence of body mass on rats' body temperature. Read More

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http://dx.doi.org/10.1002/bem.22236DOI Listing
February 2020

Moderate Intensity Static Magnetic Fields Prevent Thrombus Formation in Rats and Mice.

Bioelectromagnetics 2020 Jan 4;41(1):52-62. Epub 2019 Dec 4.

Institute of Materia Medica, Zhejiang Academy of Medical Sciences, Hangzhou, P.R. China.

We established three types of thrombosis models to explore the effects of the static magnetic field (SMF) on thrombosis in rats and mice with three different MF intensities. In the carrageenan-induced thrombosis model in rats, the SMF treatments reduced the black tail length of rats, extracorporeal thrombus, and the mass of wet and dry thrombus, and improved the coagulation index value. In FeCl -induced arterial thrombosis model in rats, the SMF treatment showed some anti-thrombotic effects. Read More

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http://dx.doi.org/10.1002/bem.22232DOI Listing
January 2020
1.705 Impact Factor

Multifrequency Analysis of Single Inductive Coil Measurements Across a Gel Phantom Simulation of Internal Bleeding in the Brain.

Bioelectromagnetics 2020 Jan 21;41(1):21-33. Epub 2019 Nov 21.

Department of Physiology and Pharmacology, Tel-Aviv University, Tel-Aviv, Israel.

The present study is part of an ongoing effort to develop a simple diagnostic technology for detecting internal bleeding in the brain, which can be used in lieu or in support of medical imaging and thereby reduce the cost of diagnostics in general, and in particular, would make diagnostics accessible to economically disadvantaged populations. The study deals with a single coil inductive device to be used for detecting cerebral hemorrhage. It presents a first-order experimental study that examines the predictions of our recently published theoretical study. Read More

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http://dx.doi.org/10.1002/bem.22230DOI Listing
January 2020

RF Energy Absorption in Human Bodies Due to Wearable Antennas in the 2.4 GHz Frequency Band.

Bioelectromagnetics 2020 Jan 19;41(1):73-79. Epub 2019 Nov 19.

Department of Communications Engineering, University of the Basque Country (UPV/EHU), Bilbao, Spain.

Human exposure to electromagnetic fields produced by two wearable antennas operating in the 2.4 GHz frequency band was assessed by computational tools. Both antennas were designed to be attached to the skin, but they were intended for different applications. Read More

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http://dx.doi.org/10.1002/bem.22229DOI Listing
January 2020

Registry of Buildings With Transformer Stations as a Basis for Epidemiological Studies on Health Effects of Extremely Low-Frequency Magnetic Fields.

Bioelectromagnetics 2020 Jan 19;41(1):34-40. Epub 2019 Nov 19.

Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland.

Buildings with indoor transformer stations may serve as a basis for improved epidemiological studies on the health effects of extremely low-frequency magnetic fields (ELF MFs). Previous studies have shown that ELF MF exposure can be adequately assessed based on the fact that MF levels are high in apartments directly above transformers. In this paper, we describe the creation of a registry of Finnish residential buildings with built-in transformer stations and discuss its usability in epidemiological studies. Read More

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http://dx.doi.org/10.1002/bem.22228DOI Listing
January 2020

In Vitro Evaluation of the Effect of Stimulation with Magnetic Fields on Chondrocytes.

Bioelectromagnetics 2020 Jan 17;41(1):41-51. Epub 2019 Nov 17.

Biomimetics Laboratory, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, Colombia.

Magnetic fields (MFs) have been used as an external stimulus to increase cell proliferation in chondrocytes and extracellular matrix (ECM) synthesis of articular cartilage. However, previously published studies have not shown that MFs are homogeneous through cell culture systems. In addition, variables such as stimulation times and MF intensities have not been standardized to obtain the best cellular proliferative rate or an increase in molecular synthesis of ECM. Read More

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http://dx.doi.org/10.1002/bem.22231DOI Listing
January 2020

T-Cell Differentiation to T Helper 9 Phenotype is Elevated by Extremely Low-Frequency Electromagnetic Fields Via Induction of IL-2 Signaling.

Bioelectromagnetics 2019 Dec 29;40(8):588-601. Epub 2019 Oct 29.

College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea.

Owing to the development of information technology and the electronics industry, and the increase in the use of electronic products, an increasing number of people are exposed to electromagnetic fields (EMFs) in daily life. There has been concern about the effects of EMFs on the human body. Th9 cells, which are characterized by the generation of interleukin-(IL-9), are a recently defined subset of T helper (Th) cells. Read More

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http://dx.doi.org/10.1002/bem.22219DOI Listing
December 2019

Editorial.

Authors:
James Lin

Bioelectromagnetics 2019 Dec 25;40(8):606-610. Epub 2019 Oct 25.

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http://dx.doi.org/10.1002/bem.22227DOI Listing
December 2019

Effects of 171 MHz Low-Intensity Electromagnetic Field on Glucocorticoid and Mineral Corticoid Activity of the Adrenal Glands of Rats.

Bioelectromagnetics 2019 Dec 22;40(8):578-587. Epub 2019 Oct 22.

Department of Electrical & Computer Engineering, University of Maryland, College Park, Maryland.

A sub-acute electromagnetic field (EMF) biological effect study was carried out on rats exposed in the Transverse ElectroMagnetic exposure chamber at 171 MHz Continuous Wave (CW). The experiments involved three exposure levels (15, 25, and 35 V/m) for 15 days with triplicate parallel sham-exposed controls in each series. All exposure conditions were simulated for the evaluation of the electromagnetic energy distribution and specific absorption rate (SAR) in the rat phantoms. Read More

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http://dx.doi.org/10.1002/bem.22226DOI Listing
December 2019

Comment on Letter: "Post-Normal Science and the Management of Uncertainty in Bioelectromagnetic Controversies" by A.W. Wood.

Bioelectromagnetics 2020 01 13;41(1):80-84. Epub 2019 Oct 13.

Oceania Radiofrequency Scientific Advisory Association, Brisbane, Queensland, Australia.

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http://dx.doi.org/10.1002/bem.22225DOI Listing
January 2020

Millimeter-Wave Heating in In Vitro Studies: Effect of Convection in Continuous and Pulse-Modulated Regimes.

Bioelectromagnetics 2019 Dec 3;40(8):553-568. Epub 2019 Oct 3.

Inserm, EHESP, IRSET (Institut de Recherche en Santé, Environnement et Travail) UMR_S 1085, University of Rennes, Rennes, France.

Shallow penetration of millimeter waves (MMW) and non-uniform illumination in in vitro experiments result in a non-uniform distribution of the specific absorption rate (SAR). These SAR gradients trigger convective currents in liquids affecting transient and steady-state temperature distributions. We analyzed the effect of convection on temperature dynamics during MMW exposure in continuous-wave (CW) and pulsed-wave (PW) amplitude-modulated regimes using micro-thermocouples. Read More

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http://dx.doi.org/10.1002/bem.22223DOI Listing
December 2019

Comment on: Pulsed Electromagnetic Field Therapy in the Treatment of Pain and Other Symptoms in Fibromyalgia: A Randomized Controlled Study.

Authors:
Magda Havas

Bioelectromagnetics 2019 12 3;40(8):611. Epub 2019 Oct 3.

Trent School of the Environment, Trent University, Peterborough, Ontario, Canada.

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http://dx.doi.org/10.1002/bem.22224DOI Listing
December 2019
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Melatonin Levels and Low-Frequency Magnetic Fields in Humans and Rats: New Insights From a Bayesian Logistic Regression.

Bioelectromagnetics 2019 Dec 29;40(8):539-552. Epub 2019 Sep 29.

Department of Mathematics and Statistics, The Open University, Milton Keys, UK.

The present analysis revisits the impact of extremely low-frequency magnetic fields (ELF-MF) on melatonin (MLT) levels in human and rat subjects using both a parametric and non-parametric approach. In this analysis, we use 62 studies from review articles. The parametric approach consists of a Bayesian logistic regression (LR) analysis and the non-parametric approach consists of a Support Vector analysis, both of which are robust against spurious/false results. Read More

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http://dx.doi.org/10.1002/bem.22218DOI Listing
December 2019

Evaluation of Radiofrequency and Extremely Low-Frequency Field Levels at Children's Playground Sites in Greece From 2013 to 2018.

Bioelectromagnetics 2019 Dec 20;40(8):602-605. Epub 2019 Sep 20.

Non Ionizing Radiation Office, Greek Atomic Energy Commission (EEAE), Athens, Greece.

From 2013 to 2018, in-situ measurements of radiofrequency (RF) electromagnetic fields (EMF) and extremely low-frequency (ELF) electric and magnetic fields in 317 existing and under-construction children's playground facilities, in 16 municipalities all over Greece, were carried out by the Greek Atomic Energy Commission (EEAE). These measurements were conducted following legislative framework established in 2009, which requires that compliance with the established exposure limits for EMFs should be verified in playground areas. The results are presented by the value of the electric field (E) and exposure ratio (Λ) for the RF EMF, as well as the value of the electric field (E) and magnetic flux density (B) for the ELF electric and magnetic fields. Read More

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http://dx.doi.org/10.1002/bem.22220DOI Listing
December 2019
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Early-Life Exposure to Pulsed LTE Radiofrequency Fields Causes Persistent Changes in Activity and Behavior in C57BL/6 J Mice.

Bioelectromagnetics 2019 Oct 15;40(7):498-511. Epub 2019 Sep 15.

Centre for Radiation, Chemical and Environmental Hazards, Public Health England, Chilton, Oxfordshire, UK.

Despite much research, gaps remain in knowledge about the potential health effects of exposure to radiofrequency (RF) fields. This study investigated the effects of early-life exposure to pulsed long term evolution (LTE) 1,846 MHz downlink signals on innate mouse behavior. Animals were exposed for 30 min/day, 5 days/week at a whole-body average specific energy absorption rate (SAR) of 0. Read More

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http://dx.doi.org/10.1002/bem.22217DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6790696PMC
October 2019

3D magnetopneumography magnetic dipole model and its application using fluxgate gradiometers.

Authors:
Yunlong Fang

Bioelectromagnetics 2019 Oct 8;40(7):472-487. Epub 2019 Sep 8.

Department of Intelligent Medical, Tianjin Huizhixi Information Technology, Tianjin, China.

Magnetopneumography (MPG) as a non-invasive method for pneumoconiosis diagnosis has been developed to evaluate the load and spatial distribution of particles within the human lungs through scanning of remanent magnetic fields after magnetization of the subject in a strong direct current field. The measurement of particle spatial distribution is very important for pneumoconiosis diagnosis because localized deposits may be associated with some pathological changes such as pulmonary fibrosis. Previous research found that loads of magnetite particles were proportional to their magnetic dipole moments. Read More

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http://dx.doi.org/10.1002/bem.22216DOI Listing
October 2019

One man's career in bioelectricity: A tale of luck, pluck, and loving support.

Authors:
J Patrick Reilly

Bioelectromagnetics 2019 Oct 2;40(7):522-534. Epub 2019 Sep 2.

Johns Hopkins University, Baltimore, Maryland.

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http://dx.doi.org/10.1002/bem.22212DOI Listing
October 2019

Proposal of 28 GHz In Vitro Exposure System Based on Field Uniformity for Three-Dimensional Cell Culture Experiments.

Bioelectromagnetics 2019 Oct 20;40(7):445-457. Epub 2019 Aug 20.

Radio & Satellite Research Division, Electronics and Telecommunications Research Institute, Daejeon, Korea.

This paper proposes a novel in vitro exposure system operating at millimeter-wave (mmWave) 28 GHz, one of the frequency bands under consideration for fifth generation (5G) communication. We employed the field uniformity concept along cross-sectional observation planes at shorter distances from the radiation antenna for better efficiency and a small-size system. A choke-ring antenna was designed for this purpose in consideration of a wider beamwidth (BW) and a symmetric far-field pattern across three principal planes. Read More

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http://dx.doi.org/10.1002/bem.22215DOI Listing
October 2019
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Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure.

Bioelectromagnetics 2019 Oct 8;40(7):458-471. Epub 2019 Aug 8.

Foundation for Research on Information Technologies in Society (IT'IS), Zurich, Switzerland.

The Virtual Population (ViP) phantoms have been used in many dosimetry studies, yet, to date, anatomical phantom uncertainty in radiofrequency (RF) research has largely been neglected. The objective of this study is to gain insight, for the first time, regarding the uncertainty in RF-induced fields during magnetic resonance imaging associated with tissue assignment and segmentation quality and consistency in anatomical phantoms by evaluating the differences between two generations of ViP phantoms, ViP1.x and ViP3. Read More

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http://dx.doi.org/10.1002/bem.22206DOI Listing
October 2019

Application of Bio-Impedance Analysis to Estimate the Condition of Yellowtail (Seriola quinqueradiata) Muscle at Different Storage Temperatures.

Bioelectromagnetics 2019 Oct 7;40(7):488-497. Epub 2019 Aug 7.

Grauate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki, Japan.

Changes in impedance at 2 kHz, adenosine triphosphate (ATP) content, and muscle contraction were evaluated in yellowtail during 0 (ice), 5, 10, 15, and 20°C storage. Histological changes during ice storage were also measured. At any temperature, although impedance increased with both rigor mortis and ATP consumption during early storage, it began to decrease rapidly when ATP was almost depleted. Read More

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http://dx.doi.org/10.1002/bem.22211DOI Listing
October 2019

Characterization of Levels of Extremely Low Frequency Magnetic Fields Emitted From Portable Hand-Held Fans.

Bioelectromagnetics 2019 Dec 2;40(8):569-577. Epub 2019 Aug 2.

Department of Environmental Health, Korea National Open University, Seoul, Republic of Korea.

This study aims to assess the levels of extremely low frequency magnetic fields (ELF-MF) emitted from portable hand-held fans (HHFs) and their principal frequency and to identify factors influencing these levels. We collected a total of eleven models of HHF and monitored the ELF-MF as a function of fan speed and distance from the fan. EMDEX II was used to monitor the ELF-MF. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.22210
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http://dx.doi.org/10.1002/bem.22210DOI Listing
December 2019
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Intermittent pulsed electromagnetic field stimulation activates the mTOR pathway and stimulates the proliferation of osteoblast-like cells.

Bioelectromagnetics 2019 Sep 23;40(6):412-421. Epub 2019 Jul 23.

Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan.

Pulsed electromagnetic fields (PEMFs) have been shown to be a noninvasive physical stimulant for bone fracture healing. However, PEMF stimulation requires a relatively long period of time and its mechanism of action has not yet been fully clarified. Recently, the mammalian target of rapamycin (mTOR) pathway has been shown to be involved in bone formation. Read More

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http://dx.doi.org/10.1002/bem.22207DOI Listing
September 2019

Frequency-dependent and montage-based differences in phosphene perception thresholds via transcranial alternating current stimulation.

Bioelectromagnetics 2019 Sep 23;40(6):365-374. Epub 2019 Jul 23.

School of Psychology, University of Wollongong, Wollongong, Australia.

It is well known that applying transcranial alternating current stimulation (tACS) to the scalp can generate artefactual visual perceptions of flashing or shimmering light known as phosphenes. The thresholds for generating these phosphenes have been used by international standards bodies to provide conservative estimates of the field strength required to interfere with human neural functioning and set safety limits accordingly. However, the precise relationship between electric currents and phosphene perception thresholds remains uncertain. Read More

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http://dx.doi.org/10.1002/bem.22209DOI Listing
September 2019
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