keyword
MENU ▼
Read by QxMD icon Read
search

Pulsed electromagnetic field

keyword
https://www.readbyqxmd.com/read/28337895/use-of-supercharged-cover-screw-as-static-magnetic-field-generator-for-bone-healing-1st-part-in-vitro-enhancement-of-osteoblast-like-cell-differentiation
#1
F Bambini, A Santarelli, A Putignano, M Procaccini, G Orsini, L Memè, D Sartini, M Emanuelli, L Lo Muzio
Since 1979, Pulsed electromagnetic fields (PEMFs) have been approved by the Food and Drug Administration as an effective method in the treatment of non-unions. As well as PEMFs, also static magnetic fields (SMFs) have been widely investigated in orthopaedic studies. Even if the exact mechanism of action is not well understood, a large number of studies showed specific effects both at cellular and tissue levels. As bone fracture healing and osseointegration share the same biological events, the application of magnetic field stimulation in order to facilitate the osseointegration process has been suggested...
January 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28336426/sar-simulations-safety
#2
Thomas M Fiedler, Mark E Ladd, Andreas K Bitz
At ultra-high fields, the assessment of radiofrequency (RF) safety presents several new challenges compared to low-field systems. Multi-channel RF transmit coils in combination with parallel transmit techniques produce time-dependent and spatially varying power loss densities in the tissue. Further, in ultra-high-field systems, localized field effects can be more pronounced due to a transition from the quasistationary to the electromagnetic field regime. Consequently, local information on the RF field is required for reliable RF safety assessment as well as for monitoring of RF exposure during MR examinations...
March 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28323003/pulsed-or-continuous-electromagnetic-field-induce-p53-p21-mediated-apoptotic-signaling-pathway-in-mouse-spermatogenic-cells-in-vitro-and-thus-may-affect-male-fertility
#3
Przemyslaw Solek, Lena Majchrowicz, Dominika Bloniarz, Ewelina Krotoszynska, Marek Koziorowski
The impact of electromagnetic field (EMF) on the human health and surrounding environment is a common topic investigated over the years. A significant increase in the electromagnetic field concentration arouses public concern about the long-term effects of EMF on living organisms associated with many aspects. In the present study, we investigated the effects of pulsed and continuous electromagnetic field (PEMF/CEMF) on mouse spermatogenic cell lines (GC-1 spg and GC-2 spd) in terms of cellular and biochemical features in vitro...
March 16, 2017: Toxicology
https://www.readbyqxmd.com/read/28301678/effectiveness-of-adjunctive-interventions-for-accelerating-orthodontic-tooth-movement-a-systematic-review-of-systematic-reviews
#4
REVIEW
Jianru Yi, Jiani Xiao, Hanshi Li, Yu Li, Xiaobing Li, Zhihe Zhao
This study was aimed to summarize published systematic reviews that assess the effects of adjunctive interventions on the acceleration of orthodontic tooth movement (OTM). Electronic and manual searches were performed up to Aug 2016. Systematic reviews investigating the impact of adjunctive techniques on the promotion of OTM were included. The methodological quality of the included reviews was evaluated using the AMSTAR scale. The quality of evidence for each intervention was assessed using GRADE. The Jadad decision algorithm was used to select a study to provide body evidence from discordant reviews on the same intervention...
March 16, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28268316/improving-resolution-of-robotic-capsule-locomotion-using-dynamic-electromagnetic-field
#5
Fahad N Alsunaydih, Jean-Michel Redoute, Mehmet R Yuce
This paper describes a new method to control the motion of swallowable wireless capsule endoscopy devices. A dynamic magnetic field produced by a set of external magnetic coils is used to manage the locomotion of the capsule. A permanent magnet is embedded into the capsule in order to manipulate the capsule by changing the external magnetic field strength for each specific position. The dynamic magnetic field is externally controlled to reach and maintain the equilibrium state for holding the capsule in a specific location...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267751/cost-effectiveness-of-adjunct-non-pharmacological-interventions-for-osteoarthritis-of-the-knee
#6
Beth Woods, Andrea Manca, Helen Weatherly, Pedro Saramago, Eleftherios Sideris, Christina Giannopoulou, Stephen Rice, Mark Corbett, Andrew Vickers, Matthew Bowes, Hugh MacPherson, Mark Sculpher
BACKGROUND: There is limited information on the costs and benefits of alternative adjunct non-pharmacological treatments for knee osteoarthritis and little guidance on which should be prioritised for commissioning within the NHS. This study estimates the costs and benefits of acupuncture, braces, heat treatment, insoles, interferential therapy, laser/light therapy, manual therapy, neuromuscular electrical stimulation, pulsed electrical stimulation, pulsed electromagnetic fields, static magnets and transcutaneous electrical nerve Stimulation (TENS), based on all relevant data, to facilitate a more complete assessment of value...
2017: PloS One
https://www.readbyqxmd.com/read/28255202/adenosine-receptors-as-a-biological-pathway-for-the-anti-inflammatory-and-beneficial-effects-of-low-frequency-low-energy-pulsed-electromagnetic-fields
#7
REVIEW
Katia Varani, Fabrizio Vincenzi, Annalisa Ravani, Silvia Pasquini, Stefania Merighi, Stefania Gessi, Stefania Setti, Matteo Cadossi, Pier Andrea Borea, Ruggero Cadossi
Several studies explored the biological effects of low frequency low energy pulsed electromagnetic fields (PEMFs) on human body reporting different functional changes. Much research activity has focused on the mechanisms of interaction between PEMFs and membrane receptors such as the involvement of adenosine receptors (ARs). In particular, PEMF exposure mediates a significant upregulation of A2A and A3ARs expressed in various cells or tissues involving a reduction in most of the proinflammatory cytokines. Of particular interest is the observation that PEMFs, acting as modulators of adenosine, are able to increase the functionality of the endogenous agonist...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28247598/-genic-and-non-genic-regulation-of-low-frequence-pulsed-electromagnetic-fields-on-osteoblasts-differentiation
#8
Qingqing Fang, Zhizhong Li, Jian Zhou, Wengui Shi, Juanli Yan, Keming Chen
Objective: To study the genic and non-genic regulation of 50 Hz 0.6 mT pulsed electromagnenic fields (PEMF) on rat calvarial osteoblasts (ROB) differentiation. Methods: ROBs were achieved by enzyme digestion, and treated with 50 Hz 0.6 mT PEMFs for 1.5 hours after subculture. The alkaline phosphatase (ALP) activity, mRNA transcription of ALP, Runx2 and OSX and protein expression of Runx2 and OSX were detected at 0, 3, 6, 9 and 12 hours after PEMF treatment. Results: The ALP activity at 3 hours after treatment was significantly higher than that in the control(P<0...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28238117/membrane-permeabilization-of-pathogenic-yeast-in-alternating-sub-microsecond-electromagnetic-fields-in-combination-with-conventional-electroporation
#9
Vitalij Novickij, Eglė Lastauskienė, Jurgita Švedienė, Audrius Grainys, Gediminas Staigvila, Algimantas Paškevičius, Irutė Girkontaitė, Auksė Zinkevičienė, Svetlana Markovskaja, Jurij Novickij
Recently, a novel contactless treatment method based on high-power pulsed electromagnetic fields (PEMF) was proposed, which results in cell membrane permeabilization effects similar to electroporation. In this work, a new PEMF generator based on multi-stage Marx circuit topology, which is capable of delivering 3.3 T, 0.19 kV/cm sub-microsecond pulses was used to permeabilize pathogenic yeast Candida albicans separately and in combination with conventional square wave electroporation (8-17 kV/cm, 100 μs)...
February 25, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28236321/effects-of-local-vibration-and-pulsed-electromagnetic-field-on-bone-fracture-a-comparative-study
#10
Hakkı Murat Bilgin, Ferhat Çelik, Mehmet Gem, Veysi Akpolat, İsmail Yıldız, Aysun Ekinci, Mehmet Siraç Özerdem, Selçuk Tunik
The effectiveness of various therapeutic methods on bone fracture has been demonstrated in several studies. In the present study, we tried to evaluate the effect of local low-magnitude, high-frequency vibration (LMHFV) on rat tibia fracture in comparison with pulsed electromagnetic fields (PEMF) during the healing process. Mid-diaphysis tibiae fractures were induced in 30 Sprague-Dawley rats. The rats were assigned into groups such as control (CONT), LMHFV (15 min/day, 7 days/week), and PEMF (3.5 h/day, 7 days/week) for a three-week treatment...
February 25, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28226477/improving-resolution-of-robotic-capsule-locomotion-using-dynamic-electromagnetic-field
#11
Fahad N Alsunaydih, Jean-Michel Redoute, Mehmet R Yuce, Fahad N Alsunaydih, Jean-Michel Redoute, Mehmet R Yuce, Jean-Michel Redoute, Mehmet R Yuce, Fahad N Alsunaydih
This paper describes a new method to control the motion of swallowable wireless capsule endoscopy devices. A dynamic magnetic field produced by a set of external magnetic coils is used to manage the locomotion of the capsule. A permanent magnet is embedded into the capsule in order to manipulate the capsule by changing the external magnetic field strength for each specific position. The dynamic magnetic field is externally controlled to reach and maintain the equilibrium state for holding the capsule in a specific location...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220060/a-pulsed-electromagnetic-field-protects-against-glutamate-induced-excitotoxicity-by-modulating-the-endocannabinoid-system-in-ht22-cells
#12
Xin Li, Haoxiang Xu, Tao Lei, Yuefan Yang, Da Jing, Shuhui Dai, Peng Luo, Qiaoling Xu
Glutamate-induced excitotoxicity is common in the pathogenesis of many neurological diseases. A pulsed electromagnetic field (PEMF) exerts therapeutic effects on the nervous system, but its specific mechanism associated with excitotoxicity is still unknown. We investigated the role of PEMF exposure in regulating glutamate-induced excitotoxicity through the endocannabinoid (eCB) system. PEMF exposure improved viability of HT22 cells after excitotoxicity and reduced lactate dehydrogenase release and cell death...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28219997/phase-resolved-pulse-propagation-through-metallic-photonic-crystal-slabs-plasmonic-slow-light
#13
Anja Schönhardt, Dietmar Nau, Christina Bauer, André Christ, Hedi Gräbeldinger, Harald Giessen
We characterized the electromagnetic field of ultra-short laser pulses after propagation through metallic photonic crystal structures featuring photonic and plasmonic resonances. The complete pulse information, i.e. the envelope and phase of the electromagnetic field, was measured using the technique of cross-correlation frequency resolved optical gating. In good agreement, measurements and scattering matrix simulations show a dispersive behaviour of the spectral phase at the position of the resonances. Asymmetric Fano-type resonances go along with asymmetric phase characteristics...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28208417/terahertz-generation-from-laser-driven-ultrafast-current-propagation-along-a-wire-target
#14
H B Zhuo, S J Zhang, X H Li, H Y Zhou, X Z Li, D B Zou, M Y Yu, H C Wu, Z M Sheng, C T Zhou
Generation of intense coherent THz radiation by obliquely incidenting an intense laser pulse on a wire target is studied using particle-in-cell simulation. The laser-accelerated fast electrons are confined and guided along the surface of the wire, which then acts like a current-carrying line antenna and under appropriate conditions can emit electromagnetic radiation in the THz regime. For a driving laser intensity ∼3×10^{18}W/cm^{2} and pulse duration ∼10 fs, a transient current above 10 KA is produced on the wire surface...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28201884/equation-of-motion-for-the-solvent-polarization-apparent-charges-in-the-polarizable-continuum-model-application-to-time-dependent-ci
#15
Silvio Pipolo, Stefano Corni, Roberto Cammi
The dynamics of the electrons for a molecule in solution is coupled to the dynamics of its polarizable environment, i.e., the solvent. To theoretically investigate such electronic dynamics, we have recently developed equations of motion (EOM) for the apparent solvent polarization charges that generate the reaction field in the Polarizable Continuum Model (PCM) for solvation and we have coupled them to a real-time time-dependent density functional theory (RT TDDFT) description of the solute [S. Corni et al., J...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28197174/extremely-low-frequency-electromagnetic-fields-stimulation-modulates-autoimmunity-and-immune-responses-a-possible-immuno-modulatory-therapeutic-effect-in-neurodegenerative-diseases
#16
REVIEW
Fabio Guerriero, Giovanni Ricevuti
Increasing evidence shows that extremely low frequency electromagnetic fields (ELF-EMFs) stimulation is able to exert a certain action on autoimmunity and immune cells. In the past, the efficacy of pulsed ELF-EMFs in alleviating the symptoms and the progression of multiple sclerosis has been supported through their action on neurotransmission and on the autoimmune mechanisms responsible for demyelination. Regarding the immune system, ELF-EMF exposure contributes to a general activation of macrophages, resulting in changes of autoimmunity and several immunological reactions, such as increased reactive oxygen species-formation, enhanced phagocytic activity and increased production of chemokines...
December 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/28194649/numerical-modeling-of-percutaneous-auricular-vagus-nerve-stimulation-a-realistic-3d-model-to-evaluate-sensitivity-of-neural-activation-to-electrode-position
#17
Amine M Samoudi, Stefan Kampusch, Emmeric Tanghe, Jozsef C Széles, Luc Martens, Eugenijus Kaniusas, Wout Joseph
OBJECTIVE: Percutaneous stimulation of the auricular branch of the vagus nerve (pVNS) by miniaturized needle electrodes in the auricle gained importance as a treatment for acute and chronic pain. The objective is to establish a realistic numerical model of pVNS and investigate the effects of stimulation waveform, electrodes' depth, and electrodes' position on nerve excitation threshold and the percentage of stimulated nerves. METHODS: Simulations were performed with Sim4Life...
February 13, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28187249/parallel-transmission-rf-pulse-design-with-strict-temperature-constraints
#18
Cem M Deniz, Giuseppe Carluccio, Christopher Collins
RF safety in parallel transmission (pTx) is generally ensured by imposing specific absorption rate (SAR) limits during pTx RF pulse design. There is increasing interest in using temperature to ensure safety in MRI. In this work, we present a local temperature correlation matrix formalism and apply it to impose strict constraints on maximum absolute temperature in pTx RF pulse design for head and hip regions. Electromagnetic field simulations were performed on the head and hip of virtual body models. Temperature correlation matrices were calculated for four different exposure durations ranging between 6 and 24 min using simulated fields and body-specific constants...
February 10, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28173722/effect-of-a-low-frequency-pulsed-electromagnetic-field-on-expression-and-secretion-of-il-1%C3%AE-and-tnf-%C3%AE-in-nucleus-pulposus-cells
#19
Jun Zou, Yufeng Chen, Jiale Qian, Huilin Yang
Objective To investigate changes in nucleus pulposus cell expression and secretion of interleukin (IL)-1β and tumour necrosis factor (TNF)-α following stimulation with a low-frequency (LF) pulsed electromagnetic field (PEMF). Methods Primary rat nucleus pulposus cells were isolated and cultured in vitro, followed by stimulation with LF-PEMFs at a frequency of 2 Hz and different intensities, ranging from 0.5-3.0 A/m. Cells were observed for morphological changes, and proliferation rates were measured by cell viability counts...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28157854/time-domain-electromagnetic-scattering-by-a-sphere-in-uniform-translational-motion
#20
Timothy J Garner, Akhlesh Lakhtakia, James K Breakall, Craig F Bohren
Scattering by a uniformly translating sphere of a pulse that modulates the amplitude of a linearly polarized plane wave was formulated using the frame-hopping method involving a laboratory inertial reference frame and the sphere's comoving inertial reference frame. The incident signal was defined in the laboratory frame and transformed to the comoving frame with the Lorentz transformation, thereby altering the incident signal's spectrum, direction of propagation of the carrier plane wave, and the direction of the incident electric field, depending on the sphere's velocity...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
keyword
keyword
62690
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"