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Bioelectromagnetics

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https://www.readbyqxmd.com/read/28220944/magnetic-resonance-examination-of-patients-with-implanted-pacemakers-an-evaluation-of-magnetic-field-gradients-slew-rate
#1
Diego Trevisan, Gloria Miori, Armando Correale, Davide Libralon
Performing safe magnetic resonance imaging of patients with "MR conditional" pacemakers needs to meet some specific restrictions. One of these is related to the slew rate (SR) parameter, defined as the speed of magnetic field gradients rising up to their required strengths. Unfortunately, SR values cannot be easily checked at the tomograph console. The present work provides an accurate evaluation of the maximum SR for a set of widely used clinical MR sequences. The experimental approach is based on indirect measurement of time-varying spatial magnetic field gradients...
February 21, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28220941/comments-on-vladimir-binhi-and-frank-prato-s-a-physical-mechanism-of-magnetoreception-extension-and-analysis
#2
Frank Barnes, Ben Greenebaum
No abstract text is available yet for this article.
February 21, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28130880/pulsed-magnetic-field-enhances-therapeutic-efficiency-of-mesenchymal-stem-cells-in-chronic-neuropathic-pain-model
#3
Tufan Mert, Akif Hakan Kurt, İdiris Altun, Ahmet Celik, Furkan Baran, Ismail Gunay
Cell-based or magnetic field therapies as alternative approaches to pain management have been tested in several experimental pain models. The aim of this study therefore was to investigate the actions of the cell-based therapy (adipose tissue derived mesenchymal stem cells; ADMSC) or pulsed magnetic field (PMF) therapy and magneto-cell therapy (combination of ADMSC and PMF) in chronic constriction nerve injury model (CCI). The actions of individual ADMSC (route dependent [systemic or local], time-dependent [a day or a week after surgery]), or PMF and their combination (magneto-cell) therapies on hyperalgesia and allodynia were investigated by using thermal plantar test and a dynamic plantar aesthesiometer, respectively...
January 28, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28130781/time-dependent-changes-in-the-suppressive-effect-of-electric-field-exposure-on-immobilization-induced-plasma-glucocorticoid-increase-in-mice
#4
Shinji Harakawa, Takuya Hori, Noboru Inoue, Hiroshi Suzuki
We recently reported that increased glucocorticoid (GC) levels in immobilized mice were suppressed by exposure to a 50-Hz electric field (EF) in kV/m-dependent and exposure duration-dependent manners. Here, we characterized time-dependent changes in the effect of EF exposure in immobilized mice. Using control, EF-alone, immobilization-alone, and co-treated groups, plasma GC levels, and blood properties were first measured (0-60 min) to observe changes induced by each treatment and measured again (60-120 min) to assess recovery from each treatment...
January 28, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28106915/can-body-worn-devices-be-used-for-measuring-personal-exposure-to-mm-waves%C3%A2
#5
LETTER
Arno Thielens, Luc Martens, Wout Joseph
Fifth generation (5G) telecommunication networks will require more bandwidth and will use mm waves (30-300 GHz). Consequently, the aperture of antennas that are used for electromagnetic field measurements will be reduced in comparison to the ones currently used for lower frequencies (0.1-6 GHz). In combination with existing limits on incident power density prescribed by exposure guidelines, this provides an upper limit to received powers during exposure measurements. Simultaneously, an increase in the noise floor of transmitted signals will occur...
January 20, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28106913/efficacy-of-50%C3%A2-hz-electromagnetic-fields-on-human-epidermal-stem-cell-transplantation-seeded-in-collagen-sponge-scaffolds-for-wound-healing-in-a-murine-model
#6
Wen-Fang Bai, Wei-Cheng Xu, Hong-Xiang Zhu, Hong Huang, Bo Wu, Ming-Sheng Zhang
To explore the possible efficacy of electromagnetic fields (EMF) for skin tissue engineering, effects of EMF exposure on epidermal stem cells (ESC) seeded in collagen sponge scaffolds for wound healing in a murine model were investigated. The wound models of a full-thickness defect established with 36 7 ∼ 8-week-old nude mice were randomly divided into three groups: a control group, an ESC-only group, and an ESC with EMF exposure group (frequency of 50 Hz, magnetic induction of 5 mT, 60 min per day for 20 days)...
January 20, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28092407/study-of-potential-health-effects-of-electromagnetic-fields-of-telephony-and-wi-fi-using-chicken-embryo-development-as-animal-model
#7
Henri Woelders, Agnes de Wit, Alexander Lourens, Norbert Stockhofe, Bas Engel, Ina Hulsegge, Dirkjan Schokker, Paula van Heijningen, Stefan Vossen, Dave Bekers, Peter Zwamborn
The objective of this study is to investigate possible biological effects of radiofrequency electromagnetic fields (RF-EMF) as used in modern wireless telecommunication in a well-controlled experimental environment using chicken embryo development as animal model. Chicken eggs were incubated under continuous experimental exposure to GSM (1.8 GHz), DECT (1.88 GHz), UMTS (2.1 GHz), and WLAN (5.6 GHz) radiation, with the appropriate modulation protocol, using a homogeneous field distribution at a field strength of approximately 3 V/m, representing the maximum field level in a normal living environment...
January 16, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28072461/adverse-and-beneficial-effects-in-chinese-hamster-lung-fibroblast-cells-following-radiofrequency-exposure
#8
Anna Sannino, Olga Zeni, Stefania Romeo, Rita Massa, Maria Rosaria Scarfi
In this study, the effect of radiofrequency (RF) exposure to 1950 MHz, Universal Mobile Telecommunication System signal, was investigated in Chinese hamster lung fibroblast cell line (V79). Genotoxic and cytotoxic effects of 20-h exposure at specific absorption rate (SAR) values from 0.15 W/kg to 1.25 W/kg were measured by means of cytokinesis-block micronucleus (MN) assay. Exposure was carried out blinded under strictly controlled conditions of dosimetry and temperature. The effect of RF exposure alone at four SAR values was tested, that is, 0...
January 10, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28026095/pulsed-electromagnetic-field-at-different-stages-of-knee-osteoarthritis-in-rats-induced-by-low-dose-monosodium-iodoacetate-effect-on-subchondral-trabecular-bone-microarchitecture-and-cartilage-degradation
#9
Xiaotian Yang, Hongchen He, Yuan Zhou, Yujing Zhou, Qiang Gao, Pu Wang, Chengqi He
The aim of the study was to investigate the efficacy of pre-emptive, early, and delayed pulsed electromagnetic field (PEMF) treatment on cartilage and subchondral trabecular bone in knee osteoarthritis (OA) rats induced by low-dose monosodium iodoacetate (MIA). Seventy-five 12-week-old male Sprague-Dawley rats were assigned to five groups: OA (n = 30), pre-emptive PEMF (n = 10), early PEMF (n = 10), delayed PEMF (n = 10), and control (n = 15). Osteoarthritis was induced by injecting 0.2 mg MIA in rat's right knee joint...
December 27, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28026051/the-effects-of-electromagnetic-fields-on-b16-bl6-cells-are-dependent-on-their-spatial-and-temporal-character
#10
Carly A Buckner, Alison L Buckner, Stan A Koren, Michael A Persinger, Robert M Lafrenie
Exposure to low intensity, low frequency electromagnetic fields (EMF) has effects on several biological systems. Spatiotemporal characteristics of these EMFs are critical. The effect of several complex EMF patterns on the proliferation of B16-BL6 mouse melanoma cells was tested. Exposure to one of these patterns, the Thomas-EMF, inhibited cell proliferation and promoted calcium uptake. The Thomas-EMF is coded from a digital-to-analog file comprised of 849 points, which provides power to solenoids and can be set to alter timing, intensity, and duration of variable EMF...
December 27, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28026049/assessment-of-polarization-dependence-of-body-shadow-effect-on-dosimetry-measurements-in-2-4%C3%A2-ghz-band
#11
LETTER
Silvia de Miguel-Bilbao, Victoria Ramos, Juan Blas
Personal exposure meters (PEMs) are portable measuring devices of electromagnetic field levels. Extreme proximity of the wearer causes an underestimation in logged data, known as body shadow effect (BSE), which undermines the reliability of exposure measurements. This paper analyzes the influence of horizontal polarization of the radiation source on PEM measurements in four multipath environments and under dynamic conditions, at a frequency band of 2.4 GHz. By comparing experimental measurements and simulated results, the PEM wearer is modeled theoretically as a shadow angle whose value is determined in terms of maximum P-value and minimum root mean square error...
December 27, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28026048/consideration-of-different-heating-lengths-of-needles-with-induction-heating-and-resistance-system-a-novel-design-of-needle-module-for-thermal-ablation
#12
Huy-Tien Bui, Sheng-Jye Hwang, Huei-Huang Lee, Durn-Yuan Huang
Thermal ablation using alternating electromagnetic fields is a promising method to treat tissues including tumors. With this approach, an electromagnetic field is generated around an induction coil, which is supplied with high frequency current from a power source. Any electrically conducting object, which is placed in the electromagnetic field, is then heated due to eddy currents. Basic principles underlying this novel thermotherapy needle system are internal induction and resistance heating. This presents a new design of a standard gauge 18 percutaneous trans-hepatic cholangiography needle module combined with a compact power source...
December 27, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28026047/rf-emf-exposure-at-1800%C3%A2-mhz-did-not-elicit-dna-damage-or-abnormal-cellular-behaviors-in-different-neurogenic-cells
#13
Liling Su, Xiaoxia Wei, Zhengping Xu, Guangdi Chen
Despite many years of studies, the debate on genotoxic effects of radiofrequency electromagnetic fields (RF-EMF) continues. To systematically evaluate genotoxicity of RF-EMF, this study examined effects of RF-EMF on DNA damage and cellular behavior in different neurogenic cells. Neurogenic A172, U251, and SH-SY5Y cells were intermittently (5 min on/10 min off) exposed to 1800 MHz RF-EMF at an average specific absorption rate (SAR) of 4.0 W/kg for 1, 6, or 24 h. DNA damage was evaluated by quantification of γH2AX foci, an early marker of DNA double-strand breaks...
December 27, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28012193/theoretical-evidence-of-maximum-intracellular-currents-versus-frequency-in-an-escherichia-coli-cell-submitted-to-ac-voltage
#14
Pascal Xavier, Dominique Rauly, Eric Chamberod, Jean M F Martins
In this work, the problem of intracellular currents in longilinear bacteria, such as Escherichia coli, suspended in a physiological medium and submitted to a harmonic voltage (AC), is analyzed using the Finite-Element-based software COMSOL Multiphysics. Bacterium was modeled as a cylindrical capsule, ended by semi-spheres and surrounded by a dielectric cell wall. An equivalent single-layer cell wall was defined, starting from the well-recognized three-shell modeling approach. The bacterium was considered immersed in a physiological medium, which was also taken into account in the modeling...
December 23, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/28055150/issue-information-page
#15
(no author information available yet)
No abstract text is available yet for this article.
February 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27973686/effects-of-electromagnetic-fields-on-bone-loss-in-hyperthyroidism-rat-model
#16
Chaoxu Liu, Yingchi Zhang, Tao Fu, Yang Liu, Sheng Wei, Yong Yang, Dongming Zhao, Wenchun Zhao, Mingyu Song, Xiangyu Tang, Hua Wu
Optimal therapeutics for hyperthyroidism-induced osteoporosis are still lacking. As a noninvasive treatment, electromagnetic fields (EMF) have been proven to be effective for treating osteoporosis in non-hyperthyroidism conditions. We herein systematically evaluated the reduced effects of EMF on osteoporosis in a hyperthyroidism rat model. With the use of Helmholtz coils and an EMF stimulator, 15 Hz/1 mT EMF was generated. Forty-eight 5-month-old male Sprague-Dawley rats were randomly divided into four different groups: control, levothyroxine treated (L-T4), EMF exposure + levothyroxine (EMF + L-T4), and EMF exposure without levothyroxine administration (EMF)...
February 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27901288/dielectric-properties-of-brain-tissue-at-1%C3%A2-ghz-in-acute-ischemic-stroke-experimental-study-on-swine
#17
LETTER
Serguei Semenov, Toan Huynh, Thomas Williams, Brian Nicholson, Anna Vasilenko
No abstract text is available yet for this article.
February 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862074/three-dimensional-analysis-modeling-and-simulation-of-the-effect-of-static-magnetic-fields-on-neurons
#18
Soheil Hashemi, Ali Abdolali
The effect of static magnetic fields on neuron function has been studied. None of the possible explanations are decisive or fully consistent with evidence in the literature. Therefore, the purpose of this paper is to examine the different possibilities, for the first time, through a three-dimensional modeling strategy in an effort to find out which possibility or combination is effective on cell function. A full-wave analysis was employed to simulate various effects of magnetic fields. The possibilities included force exerted on mobile ions, magnetophoretic force exerted on ions with permeability different from intracellular or extracellular fluids, magnetophoretic force exerted on sensor proteins in ion channels, and magnetophoretic pressure exerted on the membrane and spatial rotation of anisotropic diamagnetic particles...
February 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862067/static-magnetic-field-effects-on-proteases-with-fibrinolytic-activity-produced-by-mucor-subtilissimus
#19
Wendell Albuquerque, Thiago Nascimento, Romero Brandão-Costa, Thiago Fernandes, Ana Porto
The influence of a static magnetic field (SMF) on crude enzyme extracts with proteolytic activity is described and discussed. Proteolytic enzymes, which hydrolyze peptide bonds, and fibrinolytic enzymes, which dissolve fibrin clots, have industrial relevance, and applicability dependent on improvements of productivity and activity. We investigated whether a moderate SMF affects proteolysis in different in vitro tests: general proteolysis of azocasein substrate, and static and dynamic fibrinolytic processes (to compare fibrin gel configuration under exposure)...
February 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862061/effect-of-static-magnetic-field-on-endospore-germination
#20
Wen Jie Wu, Si Li Liu, Pun To Yung
This work investigated the effect of static magnetic field (SMF) on Bacillus atrophaeus endospore germination. Germination was triggered by L-alanine in 1.3-T SMF and characterized by ion release, Ca(2+) -dipicolinic acid release, and water influx. These events were monitored by electrical conductivity, Tb-DPA fluorescence, and optical density, respectively. Culturability of endospore germinated in SMF exposure was evaluated by CFU enumeration. Results indicated that 1.3-T SMF failed to significantly affect endospore germination and culturability, suggesting that the three aforementioned processes were not sensitive to SMF...
February 2017: Bioelectromagnetics
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