Enzymatic mechanisms of biological magnetic sensitivity
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 gr...
Source: Bioelectromagnetics - July 1, 2017 Category: Radiology Authors: Ulyana G. Letuta, Vitaly L. Berdinskiy, Chikako Udagawa, Yoshifumi Tanimoto Tags: Research Article Source Type: research
Hybrid model for the personal exposure meter response in an outdoor environment
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. Resp...
Source: Bioelectromagnetics - July 1, 2017 Category: Radiology Authors: Jung ‐Hwan Hwang, Sang‐Il Kwak, Jong‐Hwa Kwon, Hyung‐Do Choi Tags: Research Article Source Type: research
Influence of 340 mT static magnetic field on germination potential and mid‐infrared spectrum of wheat
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. One half of each of the exposed seed groups as well as of the unexposed control groups was sown, and the ot...
Source: Bioelectromagnetics - July 1, 2017 Category: Radiology Authors: Sa ša Ćirković, Jasmina Bačić, Novica Paunović, Tamara B. Popović, Alexander M. Trbovich, Nebojša Romčević, Jasna L. Ristić‐Djurović Tags: Research Article Source Type: research
Effects of pulsed electromagnetic fields on postmenopausal osteoporosis
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. PEMFs can enhance osteoblastoge...
Source: Bioelectromagnetics - June 30, 2017 Category: Radiology Authors: Siyi Zhu, Hongchen He, Chi Zhang, Haiming Wang, Chengfei Gao, Xijie Yu, Chengqi He Tags: Review Source Type: research
Biological effects related to geomagnetic activity and possible mechanisms
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. This variation, in turn, is viewed by way of a secondary zeitgeber for biological circadian rh...
Source: Bioelectromagnetics - June 21, 2017 Category: Radiology Authors: Viacheslav V. Krylov, Margaret Larkin Tags: Review Source Type: research
Influence of radiofrequency –electromagnetic waves from 3rd‐generation cellular phones on fertilization and embryo development in mice
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 sperma...
Source: Bioelectromagnetics - June 19, 2017 Category: Radiology Authors: Satoshi Suzuki, Miho Okutsu, Ryota Suganuma, Hiromi Komiya, Setsu Nakatani ‐Enomoto, Shunsuke Kobayashi, Yoshikazu Ugawa, Hiroyuki Tateno, Keiya Fujimori Tags: Research Article Source Type: research
Human exposure to power frequency magnetic fields up to 7.6 mT: An integrated EEG/fMRI study
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). Occipital EEG spectral power was computed in the alpha range (8–12 Hz, reportedly...
Source: Bioelectromagnetics - June 19, 2017 Category: Radiology Authors: Julien Modolo, Alex W. Thomas, Alexandre Legros Tags: Research Article Source Type: research
Influence of extremely low frequency magnetic fields on Ca2+ signaling and double messenger system in mice hippocampus and reversal function of procyanidins extracted from lotus seedpod
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 Ca2+‐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 Ca2+ content, and a decr...
Source: Bioelectromagnetics - June 2, 2017 Category: Radiology Authors: Haihui Zhang, Yuanyuan Dai, Yanxiang Cheng, Yuanqing He, Zandile Manyakara, Yuqing Duan, Guibo Sun, Xiaobo Sun Tags: Research Article Source Type: research
Issue Information ‐ Page
(Source: Bioelectromagnetics)
Source: Bioelectromagnetics - June 1, 2017 Category: Radiology Tags: Issue Information ‐ Page Source Type: research
Glycocalyx bending by an electric field increases cell motility
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. Several authors, however, have reported that cell directionality and motility behave differe...
Source: Bioelectromagnetics - May 1, 2017 Category: Radiology Authors: Francis X. Hart, John R. Palisano Tags: Research Article Source Type: research
Effect of intervention initiation timing of pulsed electromagnetic field on ovariectomy ‐induced osteoporosis in rats
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). The second batch comprised of sham‐ope...
Source: Bioelectromagnetics - May 1, 2017 Category: Radiology Authors: Jun Zhou, Yuan Liao, Yahua Zeng, Haitao Xie, Chengxiao Fu, Neng Li Tags: Research Article Source Type: research
Induced ‐orientation of nitrogen monoxide and azide ion vibrations in human hemoglobin in bidistilled water solution under a static magnetic field
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...
Source: Bioelectromagnetics - April 28, 2017 Category: Radiology Authors: Emanuele Calabr ò, Salvatore Magazù Tags: Research Article Source Type: research
Radiofrequency exposure levels in Amsterdam schools
(Source: Bioelectromagnetics)
Source: Bioelectromagnetics - April 25, 2017 Category: Radiology Authors: Luuk van Wel, Roel Vermeulen, Manon van Eijsden, Tanja Vrijkotte, Hans Kromhout, Anke Huss Tags: Letter To The Editor Source Type: research
Closed ‐form equation to estimate the dielectric properties of biological tissues as a function of age
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 i...
Source: Bioelectromagnetics - April 21, 2017 Category: Radiology Authors: Beadaa Mohammed, Konstanty Bialkowski, Amin Abbosh, Paul C. Mills, Andrew P. Bradley Tags: Research Article Source Type: research
Extremely low frequency electromagnetic field (ELF ‐EMF) reduces oxidative stress and improves functional and psychological status in ischemic stroke patients
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. Additionally, the ELF‐EMF group was exposed t...
Source: Bioelectromagnetics - April 21, 2017 Category: Radiology Authors: Natalia Cicho ń, Michał Bijak, Elżbieta Miller, Joanna Saluk Tags: Research Article Source Type: research
