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Bioelectromagnetics

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https://www.readbyqxmd.com/read/29663474/effect-of-pharmacological-modulation-of-actin-and-myosin-on-collective-cell-electrotaxis
#1
Yashar Bashirzadeh, Jonathan Poole, Shizhi Qian, Venkat Maruthamuthu
Electrotaxis-the directional migration of cells in response to an electric field-is most evident in multicellular collectives and plays an important role in physiological contexts. While most cell types respond to applied electric fields of the order of a Volt per centimeter, our knowledge of the factors influencing this response is limited. This is especially true for collective cell electrotaxis, in which the subcellular migration response within a cell has to be coordinated with coupled neighboring cells...
April 17, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29575011/stroke-localization-and-classification-using-microwave-tomography-with-k-means-clustering-and-support-vector-machine
#2
Lei Guo, Amin Abbosh
For any chance for stroke patients to survive, the stroke type should be classified to enable giving medication within a few hours of the onset of symptoms. In this paper, a microwave-based stroke localization and classification framework is proposed. It is based on microwave tomography, k-means clustering, and a support vector machine (SVM) method. The dielectric profile of the brain is first calculated using the Born iterative method, whereas the amplitude of the dielectric profile is then taken as the input to k-means clustering...
March 25, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29568067/a-wide-band-bio-chip-for-real-time-optical-detection-of-bioelectromagnetic-interactions-with-cells
#3
Caterina Merla, Micaela Liberti, Paolo Marracino, Adeline Muscat, Antoine Azan, Francesca Apollonio, Lluis M Mir
The analytical and numerical design, implementation, and experimental validation of a new grounded closed coplanar waveguide for wide-band electromagnetic exposures of cells and their optical detection in real-time is reported. The realized device fulfills high-quality requirements for novel bioelectromagnetic experiments, involving elevated temporal and spatial resolutions. Excellent performances in terms of matching bandwidth (less than -10 dB up to at least 3 GHz), emission (below 1 × 10-6  W/m2 ) and efficiency (around 1) have been obtained as revealed by both numerical simulations and experimental measurements...
March 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29537695/effect-of-cell-phone-radiofrequency-radiation-on-body-temperature-in-rodents-pilot-studies-of-the-national-toxicology-program-s-reverberation-chamber-exposure-system
#4
Michael E Wyde, Thomas L Horn, Myles H Capstick, John M Ladbury, Galen Koepke, Perry F Wilson, Grace E Kissling, Matthew D Stout, Niels Kuster, Ronald L Melnick, James Gauger, John R Bucher, David L McCormick
Radiofrequency radiation (RFR) causes heating, which can lead to detrimental biological effects. To characterize the effects of RFR exposure on body temperature in relation to animal size and pregnancy, a series of short-term toxicity studies was conducted in a unique RFR exposure system. Young and old B6C3F1 mice and young, old, and pregnant Harlan Sprague-Dawley rats were exposed to Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA) RFR (rats = 900 MHz, mice = 1,900 MHz) at specific absorption rates (SARs) up to 12 W/kg for approximately 9 h a day for 5 days...
March 14, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29528124/from-the-basic-science-of-biological-effects-of-ultrashort-electrical-pulses-to-medical-therapies
#5
REVIEW
Karl H Schoenbach
This article is based on my presentation at the D'Arsonval Ceremony at the Joint Annual Meeting of the Bioelectromagnetics Society and the European BioElectromagnetics Association in Hangzhou, China, in June of 2017. It describes the pathway from the first studies on the effects of intense, nanosecond pulses on biological cells to the development of medical therapies based on these effects. The motivation for the initial studies of the effects of high voltage, nanosecond pulses on mammalian cells was based on a simple electrical circuit model, which predicted that such pulses allow us to affect not just the plasma membrane but also the subcellular structures...
March 12, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29482182/meeting-the-imperative-to-accelerate-environmental-bioelectromagnetics-research
#6
Lance McKee
In this article, the author draws on his experience in the world of geospatial information technology standards to suggest a path toward acceleration of bioelectromagnetics science. Many studies show biological effects of extremely low frequency (ELF) and radiofrequency (RF) radiation despite that fact that the radiation is too weak to cause temperature changes in biological features. Considered together in worst case scenarios, such effects, many of which appear to have long latencies, could have potentially disastrous consequences for the health and safety of humans and wildlife...
February 23, 2018: Environmental Research
https://www.readbyqxmd.com/read/29469164/heart-rate-variability-affected-by-radiofrequency-electromagnetic-field-in-adolescent-students
#7
Jakub Misek, Igor Belyaev, Viera Jakusova, Ingrid Tonhajzerova, Jan Barabas, Jan Jakus
This study examines the possible effect of radiofrequency (RF) electromagnetic fields (EMF) on the autonomic nervous system (ANS). The effect of RF EMF on ANS activity was studied by measuring heart rate variability (HRV) during ortho-clinostatic test (i.e., transition from lying to standing and back) in 46 healthy grammar school students. A 1788 MHz pulsed wave with intensity of 54 ± 1.6 V/m was applied intermittently for 18 min in each trial. Maximum specific absorption rate (SAR10 ) value was determined to 0...
February 22, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29456487/the-discontinuous-galerkin-finite-element-method-for-solving-the-meg-and-the-combined-meg-eeg-forward-problem
#8
Maria Carla Piastra, Andreas Nüßing, Johannes Vorwerk, Harald Bornfleth, Robert Oostenveld, Christian Engwer, Carsten H Wolters
In Electro- (EEG) and Magnetoencephalography (MEG), one important requirement of source reconstruction is the forward model. The continuous Galerkin finite element method (CG-FEM) has become one of the dominant approaches for solving the forward problem over the last decades. Recently, a discontinuous Galerkin FEM (DG-FEM) EEG forward approach has been proposed as an alternative to CG-FEM (Engwer et al., 2017). It was shown that DG-FEM preserves the property of conservation of charge and that it can, in certain situations such as the so-called skull leakages , be superior to the standard CG-FEM approach...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29446477/atp-sensitive-k-channel-subunits-kir6-1-kir6-2-are-the-candidate-mediators-regulating-ameliorating-effects-of-pulsed-magnetic-field-on-aortic-contractility-in-diabetic-rats
#9
Isil Ocal, Mehmet B Yilmaz, Sabriye Kocaturk-Sel, Turan Tufan, Mehmet A Erkoc, Gamze Comertpay, Hale Oksuz, Esma D Barc
Diabetes mellitus is a metabolic disease that causes increased morbidity and mortality in developed and developing countries. With recent advancements in technology, alternative treatment methods have begun to be investigated in the world. This study aims to evaluate the effect of pulsed magnetic field (PMF) on vascular complications and contractile activities of aortic rings along with Kir6.1 and Kir6.2 subunit expressions of ATP-sensitive potassium channels (KATP ) in aortas of controlled-diabetic and non-controlled diabetic rats...
February 15, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29418010/tissue-models-for-rf-exposure-evaluation-at-frequencies-above-6%C3%A2-ghz
#10
REVIEW
Marvin C Ziskin, Stanislav I Alekseev, Kenneth R Foster, Quirino Balzano
Exposures to radiofrequency (RF) energy above 6 GHz are characterized by shallow energy penetration, typically limited to the skin, but the subsequent increase in skin temperature is largely determined by heat transport in subcutaneous layers. A detailed analysis of the energy reflection, absorption, and power density distribution requires a knowledge of the properties of the skin layers and their variations. We consider an anatomically detailed model consisting of 3 or 4 layers (stratum corneum, viable epidermis plus dermis, subcutaneous fat, and muscle)...
February 8, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29393520/magnetic-field-pattern-synthesis-and-its-application-in-targeted-drug-delivery-design-and-implementation
#11
Amirhossein Hajiaghajani, Ali Abdolali
In cancer therapy, magnetic drug targeting is considered as an effective treatment to reduce chemotherapy's side effects. The accurate design and shaping of magnetic fields are crucial for healthy cells to be immune from chemotherapeutics. In this paper, arbitrary 2-dimensional spatial patterns of magnetic fields from DC to megahertz are represented in terms of spatial Fourier spectra with sinusoidal eigenfunctions. Realization of each spatial frequency was investigated by a set of elliptical coils. Therefore, it is shown that the desired pattern was synthesized by simultaneous use of coil sets...
February 2, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29350413/occupational-exposure-to-extremely-low-frequency-magnetic-fields-and-the-risk-of-als-a-systematic-review-and-meta-analysis
#12
Anke Huss, Susan Peters, Roel Vermeulen
We performed a meta-analysis to examine associations of occupational exposure to extremely-low frequency magnetic fields (ELF-MF) with amyotrophic lateral sclerosis (ALS). Epidemiologic studies were identified in EMBASE and MEDLINE, in reference lists and a specialist database. We included studies that reported risk estimates of ALS in association with occupational ELF-MF exposure. Summary relative risks (RR) or odds ratios (OR) were obtained with random effect meta-analysis, and analyses were stratified by type of exposure assessment...
February 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29350408/calibration-and-non-orthogonality-correction-of-three-axis-hall-sensors-for-the-monitoring-of-mri-workers-exposure-to-static-magnetic-fields
#13
Antoine Delmas, Lamia Belguerras, Nicolas Weber, Freddy Odille, Cédric Pasquier, Jacques Felblinger, Pierre-André Vuissoz
A Magnetic Resonance Imaging (MRI) scanner uses three different electromagnetic fields (EMF) to produce body images: a static permanent magnetic field (MF), several pulsed magnetic gradients, and a radiofrequency pulse. As a result, any occupation that includes an MRI exposes workers to a strong MF. The World Health Organization has now given the monitoring of occupational EMF exposure a high priority. One design for a low-cost, compact MF exposure monitor (« MR exposimeter ») uses a set of three orthogonally assembled Hall sensors...
February 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29251361/pulsed-electromagnetic-field-improves-subchondral-bone-microstructure-in-knee-osteoarthritis-rats-through-a-wnt-%C3%AE-catenin-signaling-associated-mechanism
#14
Xiaotian Yang, Hongchen He, Qiang Gao, Chengqi He
Pulsed electromagnetic field (PEMF) is often used for management of osteoarthritis (OA). The aim of the study was to determine whether PEMF can successfully improve subchondral bone microstructure through a Wnt/β-catenin signaling-associated pathway in rats with knee OA induced by low-dose monosodium iodoacetate (MIA). Seventy-two 12-week-old male Sprague-Dawley rats were randomly assigned to three groups: OA (n = 24), PEMF (n = 24), and Control (n = 24). OA was induced (OA and PEMF groups) by injecting 0...
February 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29251353/uniform-magnetic-targeting-of-magnetic-particles-attracted-by-a-new-ferromagnetic-biological-patch
#15
Ning Pei, Lanlan Cai, Kai Yang, Jiaqi Ma, Yongyong Gong, Qixin Wang, Zheyong Huang
A new non-toxic ferromagnetic biological patch (MBP) was designed in this paper. The MBP consisted of two external layers that were made of transparent silicone, and an internal layer that was made of a mixture of pure iron powder and silicon rubber. Finite-element analysis showed that the local inhomogeneous magnetic field (MF) around the MBP was generated when MBP was placed in a uniform MF. The local MF near the MBP varied with the uniform MF and shape of the MBP. Therefore, not only could the accumulation of paramagnetic particles be adjusted by controlling the strength of the uniform MF, but also the distribution of the paramagnetic particles could be improved with the different shape of the MBP...
February 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29194676/extremely-high-frequency-electromagnetic-radiation-enhances-neutrophil-response-to-particulate-agonists
#16
Irina I Vlasova, Elena V Mikhalchik, Alexandr A Gusev, Nadezhda G Balabushevich, Sergey A Gusev, Konstantin D Kazarinov
The growing use of extremely high-frequency electromagnetic radiation (EHF EMR) in information and communication technology and in biomedical applications has raised concerns regarding the potential biological impact of millimeter waves (MMWs). Here, we elucidated the effects of MMW radiation on neutrophil activation induced by opsonized zymosan or E. coli in whole blood ex vivo. After agonist addition to blood, two samples were prepared. A control sample was incubated at ambient conditions without any treatment, and a test sample was exposed to EHF EMR (32...
February 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29171064/analysis-of-ear-side-of-mobile-phone-use-in-the-general-population-of-japan
#17
Yasuto Sato, Noriko Kojimahara, Masao Taki, Naohito Yamaguchi
This study aimed to clarify the distribution of the ear side of mobile phone use in the general population of Japan and clarify what factors are associated with the ear side of mobile phone use. Children at elementary and junior high schools (n = 2,518) and adults aged ≥20 years (n = 1,529) completed an Internet-based survey. Data were subjected to a logistic regression analysis. In children, due to the tendency to use the dominant hand, we analyzed the factors associated with the use of right ear in right-handed people...
January 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29171038/effects-of-exposure-to-electromagnetic-field-from-915-mhz-radiofrequency-identification-system-on-circulating-blood-cells-in-the-healthy-adult-rat
#18
Hye Sun Kim, Jae Sung Park, Yeung-Bae Jin, Hyung Do Choi, Jong Hwa Kwon, Jeong-Ki Pack, Nam Kim, Young Hwan Ahn
We investigated whether exposure to the 915 MHz radiofrequency identification (RFID) signal affected circulating blood cells in rats. Sprague-Dawley rats were exposed to RFID at a whole-body specific absorption rate of 2 W/kg for 8 h per day, 5 days per week, for 2 weeks. Complete blood counts were performed after RFID exposure, and the CD4+ /CD8+ ratio was determined by flow cytometry. The number of red blood cells (RBCs) and the values of hemoglobin, hematocrit, and RBC indices were increased in the RFID-exposed group compared with those in the cage-control and sham-exposed groups (P < 0...
January 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29171034/retrospective-estimation-of-the-electric-and-magnetic-field-exposure-conditions-in-in-vitro-experimental-reports-reveal-considerable-potential-for-uncertainty
#19
Lucas A Portelli, Karsten Falldorf, György Thuróczy, Jan Cuppen
Experiments on cell cultures exposed to extremely low frequency (ELF, 3-300 Hz) magnetic fields are often subject to multiple sources of uncertainty associated with specific electric and magnetic field exposure conditions. Here we systemically quantify these uncertainties based on exposure conditions described in a group of bioelectromagnetic experimental reports for a representative sampling of the existing literature. The resulting uncertainties, stemming from insufficient, ambiguous, or erroneous description, design, implementation, or validation of the experimental methods and systems, were often substantial enough to potentially make any successful reproduction of the original experimental conditions difficult or impossible...
November 24, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/29149544/referees-for-bioelectromagnetics-2017
#20
EDITORIAL
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No abstract text is available yet for this article.
December 2017: Bioelectromagnetics
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