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Bioelectromagnetics

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https://www.readbyqxmd.com/read/28072461/adverse-and-beneficial-effects-in-chinese-hamster-lung-fibroblast-cells-following-radiofrequency-exposure
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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/27973686/effects-of-electromagnetic-fields-on-bone-loss-in-hyperthyroidism-rat-model
#8
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)...
December 14, 2016: 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
#9
LETTER
Serguei Semenov, Toan Huynh, Thomas Williams, Brian Nicholson, Anna Vasilenko
No abstract text is available yet for this article.
November 30, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/27859499/growth-characteristics-of-maize-seeds-exposed-to-magnetic-field
#10
Ananta Vashisth, Devendra Kumar Joshi
Standardization of magnetic field was done for maximum enhancement in germination characteristics of maize seeds. Seeds of maize were exposed to static magnetic fields of strength 50, 100, 150, 200, and 250 for 1, 2, 3, and 4 h for all field strengths. Results indicate that magnetic field application enhanced seed performance in terms of percentage germination, speed of germination, seedling length, and seedling dry weight significantly compared to unexposed control. Among the various combinations of field strength and duration, 200 mT for 1 h exposure gave best results...
November 17, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862074/three-dimensional-analysis-modeling-and-simulation-of-the-effect-of-static-magnetic-fields-on-neurons
#11
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...
November 14, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862067/static-magnetic-field-effects-on-proteases-with-fibrinolytic-activity-produced-by-mucor-subtilissimus
#12
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)...
November 14, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/27862061/effect-of-static-magnetic-field-on-endospore-germination
#13
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...
November 10, 2016: Bioelectromagnetics
https://www.readbyqxmd.com/read/27783424/direct-electric-current-modifies-important-cellular-aspects-and-ultrastructure-features-of-candida-albicans-yeasts-influence-of-doses-and-polarities
#14
Gleyce Moreno Barbosa, Eldio Gonçalves Dos Santos, Francielle Neves Carvalho Capella, Fortune Homsani, Carina de Pointis Marçal, Roberta Dos Santos Valle, Érika de Araújo Abi-Chacra, Lys Adriana Braga-Silva, Marcelo Henrique de Oliveira Sales, Inácio Domingos da Silva Neto, Venicio Feo da Veiga, André Luis Souza Dos Santos, Carla Holandino
Available treatments against human fungal pathogens present high levels of resistance, motivating the development of new antifungal therapies. In this context, the present work aimed to analyze direct electric current (DC) antifungal action, using an in vitro apparatus equipped with platinum electrodes. Candida albicans yeast cells were submitted to three distinct conditions of DC treatment (anodic flow-AF; electroionic flow-EIF; and cathodic flow-CF), as well as different charges, ranging from 0.03 to 2.40 C...
October 26, 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/27925322/issue-information-page
#16
(no author information available yet)
No abstract text is available yet for this article.
January 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27859405/effects-of-bmp9-and-pulsed-electromagnetic-fields-on-the-proliferation-and-osteogenic-differentiation-of-human-periodontal-ligament-stem-cells
#17
Tingting Wang, Pei Wang, Zhizhong Cao, Xingxing Wang, Dalin Wang, Yaxian Shen, Da Jing, Erping Luo, Weizhong Tang
Periodontal ligament stem cells (PDLSCs) have been confirmed to have self-renewal capacity and multidifferentiation potential and are good candidates for periodontal tissue regeneration. Pulsed electromagnetic field (PEMF) has been demonstrated to promote osteogenesis in non-union fractures, partly by regulating mesenchymal stem cells or osteoblast activity. However, there is no report about the osteo-inductive effect of PEMF stimulation on human PDLSCs (hPDLSCs). Thus, we tested the hypothesis that PEMF biophysical stimulation alone has an influence on the proliferation and osteogenic differentiation of hPDLSCs...
January 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27859403/a-physical-mechanism-of-magnetoreception-extension-and-analysis
#18
Vladimir N Binhi, Frank S Prato
Proposed is a general physical mechanism of magnetoreception of weak magnetic fields (MFs). The mechanism is based on classical precessional dynamics of a magnetic moment in a thermally disturbed environment and includes a minimum of necessary parameters-the gyromagnetic ratio, thermal relaxation time, and rate of downstream events generated by changes in the state of the magnetic moment. The mechanism imposes general restrictions on the probability of initial biophysical magnetic transduction event before the involvement of specific biophysical and biochemical mechanisms-i...
January 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27770441/effect-of-static-magnetic-field-on-pain-level-and-expression-of-p2x3-receptors-in-the-trigeminal-ganglion-in-mice-following-experimental-tooth-movement
#19
Yafen Zhu, Shengguo Wang, Hu Long, Jingyi Zhu, Fan Jian, Niansong Ye, Wenli Lai
Recent research has demonstrated that static magnetic fields (SMF) can generate an analgesic effect in different conditions. The present study explored effects of SMF on pain levels and expressions of P2X3 receptors in trigeminal ganglion (TG) in mice after experimental tooth movement (tooth movement induced by springs between teeth). Experiments were performed in male mice (body mass: 25-30 g) and divided into SMF + force group, force group, and no force group. Exposure time was over 22 h per day. Mouse Grimace Scale was used for evaluating orofacial pain levels during experimental tooth movement at 4 h and 1, 3, 7, and 14 days...
January 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/27748977/enhancing-cold-atmospheric-plasma-treatment-of-cancer-cells-by-static-magnetic-field
#20
Xiaoqian Cheng, Kenan Rajjoub, Alexey Shashurin, Dayun Yan, Jonathan H Sherman, Ka Bian, Ferid Murad, Michael Keidar
It has been reported since late 1970 that magnetic field interacts strongly with biological systems. Cold atmospheric plasma (CAP) has also been widely studied over the past few decades in physics, biology, and medicine. In this study, we propose a novel idea to combine static magnetic field (SMF) with CAP as a tool for cancer therapy. Breast cancer cells and wild type fibroblasts were cultured in 96-well plates and treated by CAP with or without SMF. Breast cancer cells MDA-MB-231 showed a significant decrease in viability after direct plasma treatment with SMF (compared to only plasma treatment)...
January 2017: Bioelectromagnetics
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