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Bioelectromagnetics

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https://www.readbyqxmd.com/read/28799651/thermal-mapping-on-male-genital-and-skin-tissues-of-laptop-thermal-sources-and-electromagnetic-interaction
#1
Mahdi Safari, Navid Mosleminiya, Ali Abdolali
Since the development of communication devices and expansion of their applications, there have been concerns about their harmful health effects. The main aim of this study was to investigate laptop thermal effects caused by exposure to electromagnetic fields and thermal sources simultaneously; propose a nondestructive, replicable process that is less expensive than clinical measurements; and to study the effects of positioning any new device near the human body in steady state conditions to ensure safety by U...
August 11, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28782873/stable-morphological-physiological-and-neural-protein-expression-changes-in-rat-bone-marrow-mesenchymal-stem-cells-treated-with-electromagnetic-field-and-nitric-oxide
#2
Nazanin Haghighat, Parviz Abdolmaleki, Mehrdad Behmanesh, Mohammad Satari
As an external physical factor, electromagnetic field (EMF) may influence cellular processes and nitric oxide (NO) by serving as a secondary messenger molecule in intracellular signaling cascades. Effects of these factors were evaluated simultaneously on viability, morphology, and variation of calcium ion content, and neural protein marker expression in rat bone marrow mesenchymal stem cells (BMSCs). The mesenchymal stem cells were isolated from rat bone marrow and cultured. Deta-NO as a donor molecule of NO was added to cell culture medium after several passages...
August 7, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28782834/magnetosensitivity-of-bacteria-e-coli-magnetic-isotope-and-magnetic-field-effects
#3
Ulyana G Letuta, Vitaly L Berdinskiy
The biological effects of a (25) Mg nuclear spin and weak magnetic fields have been found and studied by using bacterial cells of Escherichia coli (E. coli) grown on standard M9 nutrient media with different isotopes of magnesium: (24) Mg, (25) Mg, (26) Mg, and a natural mixture of Mg isotopes. Among these isotopes only (25) Mg has a nuclear spin I = 5/2 and nuclear magnetic moment which have been known to affect enzymatic processes in vitro due to hyperfine interactions with uncoupled electrons of substrates...
August 7, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28741320/differential-intensity-dependent-effects-of-pulsed-electromagnetic-fields-on-rankl-induced-osteoclast-formation-apoptosis-and-bone-resorbing-ability-in-raw264-7-cells
#4
Pan Wang, Juan Liu, Yuefan Yang, Mingming Zhai, Xi Shao, Zedong Yan, Xuhui Zhang, Yan Wu, Lu Cao, Bingdong Sui, Erping Luo, Da Jing
Pulsed electromagnetic fields (PEMF) have been proven to be effective for promoting bone mass and regulating bone turnover both experimentally and clinically. However, the exact mechanisms for the regulation of PEMF on osteoclastogenesis as well as optical exposure parameters of PEMF on inhibiting osteoclastic activities and functions remain unclear, representing significant limitations for extensive scientific application of PEMF in clinics. In this study, RAW264.7 cells incubated with RANKL were exposed to 15 Hz PEMF (2 h/day) at various intensities (0...
July 24, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28741293/the-2016-most-influential-bioelectromagnetics-journal-paper-by-citation-award
#5
EDITORIAL
James C Lin
No abstract text is available yet for this article.
July 24, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28715607/variation-in-the-dielectric-properties-of-freshly-excised-colorectal-cancerous-tissues-at-different-tumor-stages
#6
Zhou Li, Weiwei Wang, Zhai Cai, Shuai Han, Shiming Lin, Linyun He, Miaoliang Chen, Dongyue Pan, Guanhua Deng, Song Duan, Sherman Xuegang Xin
The study was designed to identify differences in the dielectric properties of ex vivo colorectal cancerous tissues at different tumor stages. To date, 130 freshly excised colorectal cancerous specimens underwent measurement of both relative permittivity and conductivity on the serosal and mucosal surfaces of the carcinoma nidus, and the mucosa of the surgical resection margin ranging from 50 to 500 MHz at the Larmor frequencies. Tumor node metastasis staging was determined according to pathological reports for each patient...
July 17, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28715606/enzymatic-mechanisms-of-biological-magnetic-sensitivity
#7
Ulyana G Letuta, Vitaly L Berdinskiy, Chikako Udagawa, Yoshifumi Tanimoto
Primary biological magnetoreceptors in living organisms is one of the main research problems in magnetobiology. Intracellular enzymatic reactions accompanied by electron transfer have been shown to be receptors of magnetic fields, and spin-dependent ion-radical processes can be a universal mechanism of biological magnetosensitivity. Magnetic interactions in intermediate ion-radical pairs, such as Zeeman and hyperfine (HFI) interactions, in accordance with proposed strict quantum mechanical theory, can determine magnetic-field dependencies of reactions that produce biologically important molecules needed for cell growth...
July 17, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28708936/hybrid-model-for-the-personal-exposure-meter-response-in-an-outdoor-environment
#8
Jung-Hwan Hwang, Sang-Il Kwak, Jong-Hwa Kwon, Hyung-Do Choi
When a personal exposure meter (PEM) is worn by a human subject, the electric-field strength measured at the PEM is affected by a body shadowing effect. In our study, a hybrid model is proposed for modeling the body shadowing effect for when the PEM is used in an outdoor environment. The hybrid model contains responses to direct and diffused waves, the factors related to the transmission path and cross-polarization discrimination, respectively. To derive the hybrid model, responses for the direct and diffused waves are measured using a human phantom in an anechoic chamber and a reverberation chamber, respectively...
July 14, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28700087/influence-of-340%C3%A2-mt-static-magnetic-field-on-germination-potential-and-mid-infrared-spectrum-of-wheat
#9
Saša Ćirković, Jasmina Bačić, Novica Paunović, Tamara B Popović, Alexander M Trbovich, Nebojša Romčević, Jasna L Ristić-Djurović
In a number of studies, a static magnetic field was observed to positively influence the growing process of various plants; however, the effect has not yet been related to possible structural changes. We investigate if the static magnetic field that improves germination of wheat also alters wheat's near-infrared spectrum. Two groups of seeds were exposed to 340 mT for 16 h cumulatively. The first group was exposed 8 days for 2 h per day, while the second group was exposed 4 h per day for 4 consecutive days...
July 12, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28665487/effects-of-pulsed-electromagnetic-fields-on-postmenopausal-osteoporosis
#10
REVIEW
Siyi Zhu, Hongchen He, Chi Zhang, Haiming Wang, Chengfei Gao, Xijie Yu, Chengqi He
Postmenopausal osteoporosis (PMOP) is considered to be a well-defined subject that has caused high morbidity and mortality. In elderly women diagnosed with PMOP, low bone mass and fragile bone strength have been proven to significantly increase risk of fragility fractures. Currently, various anabolic and anti-resorptive therapies have been employed in an attempt to retain healthy bone mass and strength. Pulsed electromagnetic fields (PEMFs), first applied in treating patients with delayed fracture healing and nonunions, may turn out to be another potential and effective therapy for PMOP...
June 30, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28636777/biological-effects-related-to-geomagnetic-activity-and-possible-mechanisms
#11
REVIEW
Viacheslav V Krylov, Margaret Larkin
This review presents contemporary data on the biological effects of geomagnetic activity. Correlations between geomagnetic indices and biological parameters and experimental studies that used simulated geomagnetic storms to detect possible responses of organisms to these events in nature are discussed. Possible mechanisms by which geomagnetic activity influences organisms are also considered. Special attention is paid to the idea that geomagnetic activity is perceived by organisms as a disruption of diurnal geomagnetic variation...
June 21, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28628224/human-exposure-to-power-frequency-magnetic-fields-up-to-7-6%C3%A2-mt-an-integrated-eeg-fmri-study
#12
Julien Modolo, Alex W Thomas, Alexandre Legros
We assessed the effects of power-line frequency (60 Hz in North America) magnetic fields (MF) in humans using simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Twenty-five participants were enrolled in a pseudo-double-blind experiment involving "real" or "sham" exposure to sinusoidal 60 Hz MF exposures delivered using the gradient coil of an MRI scanner following two conditions: (i) 10 s exposures at 3 mT (10 repetitions); (ii) 2 s exposures at 7.6 mT (100 repetitions)...
June 19, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28628221/influence-of-radiofrequency-electromagnetic-waves-from-3rd-generation-cellular-phones-on-fertilization-and-embryo-development-in-mice
#13
Satoshi Suzuki, Miho Okutsu, Ryota Suganuma, Hiromi Komiya, Setsu Nakatani-Enomoto, Shunsuke Kobayashi, Yoshikazu Ugawa, Hiroyuki Tateno, Keiya Fujimori
The purpose of this study was to evaluate the effects of 3rd-generation (3G) cellular phone radiofrequency-electromagnetic wave (RF-EMW) exposure on fertilization and embryogenesis in mice. Oocytes and spermatozoa were exposed to 3G cellular phone RF-EMWs, 1.95 GHz wideband code division multiple access, at a specific absorption rate of 2 mW/g for 60 min, or to sham exposure. After RF-EMW exposure, in vitro fertilization and intracytoplasmic sperm injection were performed. Rates of fertilization, embryogenesis (8-cell embryo, blastocyst), and chromosome aberration were compared between the combined spermatozoa and oocyte groups: both exposed, both non-exposed, one exposed, and the other non-exposed...
June 19, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28586318/modelling-of-induced-electric-fields-based-on-incompletely-known-magnetic-fields
#14
Ilkka Laakso, Valerio De Santis, Silvano Cruciani, Tommaso Campi, Mauro Feliziani
Determining the induced electric fields in the human body is a fundamental problem in bioelectromagnetics that is important for both evaluation of safety of electromagnetic fields and medical applications. However, existing techniques for numerical modelling of induced electric fields require detailed information about the sources of the magnetic field, which may be unknown or difficult to model in realistic scenarios. Here, we show how induced electric fields can accurately be determined in the case where the magnetic fields are known only approximately, e...
July 28, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28570746/influence-of-extremely-low-frequency-magnetic-fields-on-ca-2-signaling-and-double-messenger-system-in-mice-hippocampus-and-reversal-function-of-procyanidins-extracted-from-lotus-seedpod
#15
Haihui Zhang, Yuanyuan Dai, Yanxiang Cheng, Yuanqing He, Zandile Manyakara, Yuqing Duan, Guibo Sun, Xiaobo Sun
This research investigated the influence of extremely low frequency magnetic fields (ELF-MF; 50 Hz, 8 mT, 4 h per day, for 28 days) on calcium ion signaling and the double messenger system in the hippocampus of mice. Messengers that were studied included: G-protein, Ins(1,4,5)P3 (IP3 ), diacylglycerol (DAG), cAMP-dependent protein kinase (PKA), and Ca(2+) -dependent protein kinase C (PKC). The results showed that ELF-MF caused an increase in the levels of Gi protein, IP3, DAG, PKA and PKC beta, calcium and calmodulin-dependent protein phosphatase calcineuring (PP2B), and intracellular Ca(2+) content, and a decrease in calcium/calmodulin-dependent protein kinase II (CaMK II) and PKC alpha...
June 1, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28543319/glycocalyx-bending-by-an-electric-field-increases-cell-motility
#16
Francis X Hart, John R Palisano
The application of physiological strength electric fields may produce a wide range of effects on cells. The mechanisms by which cells detect the presence of these fields, however, are not fully understood. Previous experiments have shown that directionality of cells in the field is governed by an electromechanical mechanism in which the field exerts a torque on the negatively charged, inner glycocalyx that is then transmitted as a force on the cytoskeleton. This mechanism is similar to that by which cells detect fluid shear forces...
May 24, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28510268/effect-of-intervention-initiation-timing-of-pulsed-electromagnetic-field-on-ovariectomy-induced-osteoporosis-in-rats
#17
Jun Zhou, Yuan Liao, Yahua Zeng, Haitao Xie, Chengxiao Fu, Neng Li
The aim of this study is to explore the effect of timing of initiation of pulsed electromagnetic field (PEMF) therapy on bone mass, microarchitecture, and biomechanical properties, and to investigate receptor activator of NF-kB (RANK) expression in ovariectomized (OVX) rats. Sixty female Sprague-Dawley rats were randomly divided into two equal batches of three groups each (10 rats in each group). The first batch comprised of sham-operated (Sham-0 group), ovariectomized (OVX-0 group), and ovariectomized plus treated with PEMF starting from the day of OVX (Early PEMF group)...
May 16, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28453873/induced-orientation-of-nitrogen-monoxide-and-azide-ion-vibrations-in-human-hemoglobin-in-bidistilled-water-solution-under-a-static-magnetic-field
#18
Emanuele Calabrò, Salvatore Magazù
In this study, we report the effects of static magnetic fields (SMFs) at 200 mT on different hemoglobin aqueous solutions, in the absence and in the presence of sucrose and trehalose, studied by FTIR spectroscopic techniques. Significant decrease in intensity of Amide I and Amide II vibration bands was observed after 6 h exposure for hemoglobin in bidistilled water solution. Also, it was observed that the decrease in intensity of the Amide I band was larger than the Amide II after exposure. This result can be explained assuming that an SMF induces increase of hydrogen bonding in hemoglobin in bidistilled water solution...
April 28, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28431194/closed-form-equation-to-estimate-the-dielectric-properties-of-biological-tissues-as-a-function-of-age
#19
Beadaa Mohammed, Konstanty Bialkowski, Amin Abbosh, Paul C Mills, Andrew P Bradley
Developing microwave systems for biomedical applications requires accurate dielectric properties of biological tissues for reliable modeling before prototyping and subject testing. Dielectric properties of tissues decrease with age due to the change in their water content, but there are no detailed age-dependent data, especially for young tissue-like newborns, in the literature. In this article, an age-dependent formula to predict the dielectric properties of biological tissues was derived. In the proposed method, the variation of water concentration in each type of tissue as a function of age was used to calculate its relative permittivity and conductivity...
April 21, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28430370/extremely-low-frequency-electromagnetic-field-elf-emf-reduces-oxidative-stress-and-improves-functional-and-psychological-status-in-ischemic-stroke-patients
#20
Natalia Cichoń, Michał Bijak, Elżbieta Miller, Joanna Saluk
As a result of ischaemia/reperfusion, massive generation of reactive oxygen species occurs, followed by decreased activity of antioxidant enzymes. Extremely low frequency electromagnetic fields (ELF-EMF) can modulate oxidative stress, but there are no clinical antioxidant studies in brain stroke patients. The aim of our study was to investigate the effect of ELF-EMF on clinical and antioxidant status in post-stroke patients. Fifty-seven patients were divided into two groups: ELF-EMF and non-ELF-EMF. Both groups underwent the same 4-week rehabilitation program...
July 2017: Bioelectromagnetics
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