Dielectric polarization transients in biological tissue moving in a static magnetic field
In this study, we examined the effect of dielectric polarization on the electric field (EF) induced by human movements in a strong magnetic field (MF). Analytic equations for brain and bone equivalent spheres translating and rotating in a uniform MF were derived from Maxwell equations. Several examples were computed by using Fast Fourier Transform to examine transient dielectric effects in a time domain. The results showed that dielectric polarization transients do arise, but in the case of homogeneous medium, they are vanishingly small. In contrast, the local dielectric transients are not vanishingly small in heterogeneou...
Source: Bioelectromagnetics - April 30, 2016 Category: Radiology Authors: Kari Jokela, Ilkka Laakso Tags: Research Article Source Type: research
Effects of pulsed electromagnetic fields on peripheral blood circulation in people with diabetes: A randomized controlled trial
We examined the effects of pulsed electromagnetic fields (PEMFs) on cutaneous circulation of dorsal feet. Twenty‐two patients with diabetes mellitus (DM) and 21 healthy control subjects were randomly allocated to receive either PEMFs or sham PEMFs (0.5 mT, 12 Hz, 30 min). Blood flow velocity and diameter of the small vein were examined by using ultrasound biomicroscopy; also, microcirculation at skin over the base of the 1st metatarsal bone (Flux1) and distal 1st phalange (Flux2) was measured by laser Doppler flowmetry before and after intervention. Results indicated that PEMFs produced significantly greater change...
Source: Bioelectromagnetics - April 30, 2016 Category: Radiology Authors: Jiahui Sun, Rachel Lai‐Chu Kwan, Yongping Zheng, Gladys Lai‐Ying Cheing Tags: Research Article Source Type: research
Time trend in incidence of malignant neoplasms of the central nervous system in relation to mobile phone use among young people in Japan
The aim of this study was to examine whether incidence of malignant neoplasms of the central nervous system from 1993 to 2010 has increased among young people in Japan, and whether the increase could be explained by increase in mobile phone use. Joinpoint regression analysis of incidence data was performed. Subsequently, the expected incidence rate was calculated assuming that the relative risk was 1.4 for those who used mobile phones more than 1640 h cumulatively. Annual percent change was 3.9% (95% confidence interval [CI], 1.6–6.3) for men in their 20s from 1993 to 2010, 12.3% (95% CI, 3.3–22.1) for women in their...
Source: Bioelectromagnetics - April 30, 2016 Category: Radiology Authors: Yasuto Sato, Kosuke Kiyohara, Noriko Kojimahara, Naohito Yamaguchi Tags: Research Article Source Type: research
The 2015 most influential Bioelectromagnetics journal paper by citation award
(Source: Bioelectromagnetics)
Source: Bioelectromagnetics - April 30, 2016 Category: Radiology Authors: James C. Lin Tags: Editorial Source Type: research
Comparative dosimetry for children and rodents exposed to extremely low‐frequency magnetic fields
We describe a method to correlate E‐fields induced by exposure to extremely low frequency magnetic fields in laboratory mice and rats during in vivo experiments to those induced in children. Four different approaches of mapping relative dose rates between humans and rodents are herein proposed and analyzed. Based on these mapping methods and volume averaging guidelines published by the International Commission on Non‐Ionizing Radiation Protection (ICNRP) in 2010, maximum and median induced field values for whole body and for tissues of children and rodents were evaluated and compared. Median induced electric fields in ...
Source: Bioelectromagnetics - April 30, 2016 Category: Radiology Authors: Yijian Gong, Myles Capstick, Clemens Dasenbrock, Maren Fedrowitz, Cesar Cobaleda, Isidro Sánchez‐García, Niels Kuster Tags: Research Article Source Type: research
Aggregation process of paramagnetic particles in fluid in the magnetic field
Magnetic targeting is a promising therapeutic strategy for localizing systemically delivered magnetic responsive drugs or cells to target tissue, but excessive aggregation of magnetic particles could result in vascular embolization. To analyze the reason for embolization, the attractive process of magnetic particles in magnetic field (MF) was studied in this paper by analyzing the form of the aggregated paramagnetic particles while the particle suspension flowed through a tube, which served as a model of blood vessels. The effects of magnetic flux density and fluid velocity on the formation of aggregated paramagnetic parti...
Source: Bioelectromagnetics - April 29, 2016 Category: Radiology Authors: Ning Pei, Xiaoye Cheng, Zheyong Huang, Xiang Wang, Kai Yang, Ye Wang, Yongyong Gong Tags: Research Article Source Type: research
On‐body calibration and measurements using personal radiofrequency exposimeters in indoor diffuse and specular environments
For the first time, response of personal exposimeters (PEMs) is studied under diffuse field exposure in indoor environments. To this aim, both numerical simulations, using finite‐difference time‐domain method, and calibration measurements were performed in the range of 880–5875 MHz covering 10 frequency bands in Belgium. Two PEMs were mounted on the body of a human male subject and calibrated on‐body in an anechoic chamber (non‐diffuse) and a reverberation chamber (RC) (diffuse fields). This was motivated by the fact that electromagnetic waves in indoor environments have both specular and diffuse components. Bo...
Source: Bioelectromagnetics - April 28, 2016 Category: Radiology Authors: Reza Aminzadeh, Arno Thielens, Aliou Bamba, Lamine Kone, Davy Paul Gaillot, Martine Lienard, Luc Martens, Wout Joseph Tags: Research Article Source Type: research
On ‐body calibration and measurements using personal radiofrequency exposimeters in indoor diffuse and specular environments
For the first time, response of personal exposimeters (PEMs) is studied under diffuse field exposure in indoor environments. To this aim, both numerical simulations, using finite‐difference time‐domain method, and calibration measurements were performed in the range of 880–5875 MHz covering 10 frequency bands in Belgium. Two PEMs were mounted on the body of a human male subject and calibrated on‐body in an anechoic chamber (non‐diffuse) and a reverberation chamber (RC) (diffuse fields). This was motivated by the fact that electromagnetic waves in indoor environments have both specular and diffuse components. Bo...
Source: Bioelectromagnetics - April 27, 2016 Category: Radiology Authors: Reza Aminzadeh, Arno Thielens, Aliou Bamba, Lamine Kone, Davy Paul Gaillot, Martine Lienard, Luc Martens, Wout Joseph Tags: Research Article Source Type: research
Issue Information ‐ Page
(Source: Bioelectromagnetics)
Source: Bioelectromagnetics - April 13, 2016 Category: Radiology Tags: Issue Information ‐ Page Source Type: research
Long‐term electromagnetic exposure of developing neuronal networks: A flexible experimental setup
Neuronal networks in vitro are considered one of the most promising targets of research to assess potential electromagnetic field induced effects on neuronal functionality. A few exposure studies revealed there is currently no evidence of any adverse health effects caused by weak electromagnetic fields. Nevertheless, some published results are inconsistent. Particularly, doubts have been raised regarding possible athermal biological effects in the young brain during neuronal development. Therefore, we developed and characterized a flexible experimental setup based on a transverse electromagnetic waveguide, allowing control...
Source: Bioelectromagnetics - March 31, 2016 Category: Radiology Authors: Stefan Oster, Andreas W. Daus, Christian Erbes, Michael Goldhammer, Ulrich Bochtler, Christiane Thielemann Tags: Research Article Source Type: research
Early exposure of rotating magnetic fields promotes central nervous regeneration in planarian Girardia sinensis
Magnetic field exposure is an accepted safe and effective modality for nerve injury. However, it is clinically used only as a supplement or salvage therapy at the later stage of treatment. Here, we used a planarian Girardia sinensis decapitated model to investigate beneficial effects of early rotary non‐uniform magnetic fields (RMFs) exposure on central nervous regeneration. Our results clearly indicated that magnetic stimulation induced from early RMFs exposure significantly promoted neural regeneration of planarians. This stimulating effect is frequency and intensity dependent. Optimum effects were obtained when decapi...
Source: Bioelectromagnetics - March 31, 2016 Category: Radiology Authors: Qiang Chen, Gui‐miao Lin, Nan Wu, Sheng‐wei Tang, Zhi‐jia Zheng, Marie Chia‐mi Lin, Gai‐xia Xu, Hao Liu, Yue‐yue Deng, Xiao‐yun Zhang, Si‐ping Chen, Xiao‐mei Wang, Han‐ben Niu Tags: Research Article Source Type: research
Detailed modeling of palpebral fissure and its influence on SAR and temperature rise in human eye under GHz exposures
This article investigates variations in specific absorption rate and temperature rise in human eye caused by changes in palpebral fissure, the extent of opening between eyelids, under GHz plane‐wave electromagnetic (EM) exposures. Detailed human head models with different palpebral fissure features were developed with a refined spatial resolution of 0.25 mm. These head models were then incorporated into both EM and bio‐heat simulations, but using finite‐difference time‐domain method and finite‐difference method, respectively. Maximum temperature rise in lens was found to be 0.8°C under EM exposure at 100 W/m...
Source: Bioelectromagnetics - March 31, 2016 Category: Radiology Authors: Yinliang Diao, Sai‐Wing Leung, Yaqing He, Weinong Sun, Kwok‐Hung Chan, Yun‐Ming Siu, Richard Kong Tags: Research Article Source Type: research
An HF exposure system for mice with improved efficiency
An exposure system that addresses difficulties that arise for exposure of small animals at low frequencies with a high exposure level is presented. The system, intended to operate at 27 MHz, consists of two identical transverse electro‐magnetic (TEM) cells for exposure and sham exposure of groups of 16 free‐running mice housed in pairs within standard cages, capable of exposure over extended daily periods while being provided food and water. Inclusion of the exposure cell in a half‐wavelength resonator has been developed as a new paradigm to enhance field strength for an increase of >50‐fold in available speci...
Source: Bioelectromagnetics - March 31, 2016 Category: Radiology Authors: Myles Capstick, Yijian Gong, Boris Pasche, Niels Kuster Tags: Research Article Source Type: research
Mutagenic and genotoxic potential of direct electric current in Escherichia coli and Salmonella thyphimurium strains
Direct electric current has several therapeutic uses such as antibacterial and antiprotozoal action, tissues scarring and regeneration, as well as tumor treatment. This method has shown promising results in vivo and in vitro, with significant efficacy and almost no side effects. Considering lack of studies regarding direct electric current mutagenic and/or genotoxic effects, the present work evaluated both aspects by using five different bacterial experimental assays: survival of repair‐deficient mutants, Salmonella‐histidine reversion mutagenesis (Ames test), forward mutations to rifampicin resistance, phage reactivat...
Source: Bioelectromagnetics - March 28, 2016 Category: Radiology Authors: Marina das Neves Gomes, Janine Simas Cardoso, Alvaro Costa Leitão, Carla Holandino Quaresma Tags: Research Article Source Type: research
Decline of cell viability and mitochondrial activity in mouse skeletal muscle cell in a hypomagnetic field
In this study, we created an HMF (<3 μT) by eliminating geomagnetic field (GMF, ∼50 μT) and exposed primary mouse skeletal muscle cells to this low magnetic field condition for a period of three days. HMF‐exposed cells showed a decline in cell viability relative to GMF control, even though cells appeared normal in terms of morphology and survival rate. After a 3‐day HMF‐exposure, glucose consumption of skeletal muscle cells was significantly lower than GMF control, accompanied by less adenosine triphosphate (ATP) and adenosine diphosphate (ADP) content and higher ADP/ATP ratio. In agreement with these find...
Source: Bioelectromagnetics - March 23, 2016 Category: Radiology Authors: Jing‐Peng Fu, Wei‐Chuan Mo, Ying Liu, Rong‐Qiao He Tags: Research Article Source Type: research
