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Electromagnetic Radiation

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https://www.readbyqxmd.com/read/28533987/exoskeleton-may-influence-the-internal-body-temperatures-of-neotropical-dung-beetles-col-scarabaeinae
#1
Valentina Amore, Malva I M Hernández, Luis M Carrascal, Jorge M Lobo
The insect exoskeleton is a multifunctional coat with a continuum of mechanical and structural properties constituting the barrier between electromagnetic waves and the internal body parts. This paper examines the ability of beetle exoskeleton to regulate internal body temperature considering its thermal permeability or isolation to simulated solar irradiance and infrared radiation. Seven Neotropical species of dung beetles (Coleoptera, Scarabaeinae) differing in colour, surface sculptures, size, sexual dimorphism, period of activity, guild category and altitudinal distribution were studied...
2017: PeerJ
https://www.readbyqxmd.com/read/28527967/feasibility-and-safety-of-the-transbronchial-access-tool-for-peripheral-pulmonary-nodule-and-mass
#2
Mark R Bowling, Craig Brown, Carlos J Anciano
BACKGROUND: Navigational bronchoscopy and other imaging modalities have improved the ability to evaluate pulmonary nodules/mass. Many of these lesions are located outside the bronchial airway and are difficult to access even with these devices. The Transbronchial Access Tool (Medtronic, Minneapolis, MN) allows the bronchoscopist to create a pathway from the bronchial airway, across the lung parenchyma, and into the target lesion. We are reporting the feasibility and safety of this new device...
May 17, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28524900/tumor-treating-fields-nursing-implications-for-an-emerging-technology%C3%A2
#3
Alice Chang
Tumor-treating fields (TTFields) are a new technology used for cancer treatment consisting of battery-powered, insulated electromagnetic transducers that are placed on the scalp. This wearable, adhesive device is a certified physician-prescribed therapy for patients with glioblastoma multiforme, a type of primary brain cancer. TTFields are being used concomitantly with temozolomide (Temodar®) in patients with newly diagnosed glioblastoma and as a monotherapy in patients with recurrent glioblastoma after radiation therapy and chemotherapy...
June 1, 2017: Clinical Journal of Oncology Nursing
https://www.readbyqxmd.com/read/28524701/helical-water-wires
#4
A R Liboff, C Poggi, P Pratesi
A helitetrahedral model has been proposed to help explain reports of low-frequency oscillations in pure water following electromagnetic excitation at the hydronium ion cyclotron resonance frequency. The Lorentz force and the intrinsic structure constrain the motion of the H3O(+) ion so that it enjoys a unique form of proton-hopping, one whose path is helical. This model may also explain the numerous previously observed cyclotron resonance (ICR) biological couplings for cations other than hydronium by merely substituting hydrogen-bonded versions of these for hydronium in the tetrahedral structure...
May 19, 2017: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/28524674/holography-of-wi-fi-radiation
#5
Philipp M Holl, Friedemann Reinhard
Wireless data transmission systems such as wi-fi or Bluetooth emit coherent light-electromagnetic waves with a precisely known amplitude and phase. Propagating in space, this radiation forms a hologram-a two-dimensional wave front encoding a three-dimensional view of all objects traversed by the light beam. Here we demonstrate a scheme to record this hologram in a phase-coherent fashion across a meter-sized imaging region. We recover three-dimensional views of objects and emitters by feeding the resulting data into digital reconstruction algorithms...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28523373/role-of-sod-gene-in-response-to-static-magnetic-fields-in-pseudomonas-aeruginosa
#6
Raouia Hanini, Abdelwaheb Chatti, Selma Ben Ghorbel, Ahmed Landoulsi
The protective role of superoxide dismutase (SOD) against non-ionizing radiation such as static electromagnetic field (200 mT) has been studied in wild-type and mutant strain of Pseudomonas aeruginosa lacking cytosolic Mn-SOD (sodM), Fe-SOD (sodB), or both SODs (sodMB). Our results showed that inactivation of sodM and/or sodB genes increases the sensitivity of P. aeruginosa toward stress induced by the static magnetic field (200 mT). Furthermore, our results showed an enhancement of SOD, catalase, and peroxidases after exposure to the magnetic field...
May 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28522858/mapping-anomalous-dispersion-of-air-with-ultrashort-mid-infrared-pulses
#7
A V Mitrofanov, A A Voronin, D A Sidorov-Biryukov, M V Rozhko, E A Stepanov, A B Fedotov, V Shumakova, S Ališauskas, A Pugžlys, A Baltuška, A M Zheltikov
We present experimental studies of long-distance transmission of ultrashort mid-infrared laser pulses through atmospheric air, probing air dispersion in the 3.6-4.2-μm wavelength range. Atmospheric air is still highly transparent to electromagnetic radiation in this spectral region, making it interesting for long-distance signal transmission. However, unlike most of the high-transmission regions in gas media, the group-velocity dispersion, as we show in this work, is anomalous at these wavelengths due to the nearby asymmetric-stretch rovibrational band of atmospheric carbon dioxide...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28516790/oxidative-effects-of-extremely-low-frequency-magnetic-field-and-radio-frequency-radiation-on-testes-tissues-of-diabetic-and-healthy-rats
#8
D Kuzay, C Ozer, B Sirav, A G Canseven, N Seyhan
With the development of technology, people are increasingly under the exposure of electromagnetic fields. Individuals with chronic diseases such as diabetes are now long-term exposed to Radio Frequency-RF radiation and extremely low frequency (ELF) magnetic fields (MFs). The purpose of this present study is to investigate oxidative effects and antioxidant parameters of ELF MFs and RF radiation on testis tissue in diabetic and healthy rats. Wistar male rats were divided into 10 groups. Intraperitoneal single dose STZ (65 mg/kg) dissolved in citrate buffer (0...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/28504324/electromagnetic-fields-pulsed-radiofrequency-radiation-and-epigenetics-how-wireless-technologies-may-affect-childhood-development
#9
Cindy Sage, Ernesto Burgio
Mobile phones and other wireless devices that produce electromagnetic fields (EMF) and pulsed radiofrequency radiation (RFR) are widely documented to cause potentially harmful health impacts that can be detrimental to young people. New epigenetic studies are profiled in this review to account for some neurodevelopmental and neurobehavioral changes due to exposure to wireless technologies. Symptoms of retarded memory, learning, cognition, attention, and behavioral problems have been reported in numerous studies and are similarly manifested in autism and attention deficit hyperactivity disorders, as a result of EMF and RFR exposures where both epigenetic drivers and genetic (DNA) damage are likely contributors...
May 15, 2017: Child Development
https://www.readbyqxmd.com/read/28492569/-electromagnetic-interference-in-the-current-era-of-cardiac-implantable-electronic-devices-designed-for-magnetic-resonance-environment
#10
Valentina Ribatti, Luca Santini, Giovanni B Forleo, Domenico Della Rocca, Germana Panattoni, Marta Scali, Valentina Schirripa, Nicola Danisi, Fabrizio Ammirati, Massimo Santini
In the last decades we are observing a continuous increase in the number of patients wearing cardiac implantable electronic devices (CIEDs). At the same time, we face daily with a domestic and public environment featured more and more by the presence and the utilization of new emitters and finally, more medical procedures are based on electromagnetic fields as well. Therefore, the topic of the interaction of devices with electromagnetic interference (EMI) is increasingly a real and actual problem.In the medical environment most attention is paid to magnetic resonance, nevertheless the risk of interaction is present also with ionizing radiation, electrical nerve stimulation and electrosurgery...
April 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28486438/remote-detection-of-radioactive-material-using-high-power-pulsed-electromagnetic-radiation
#11
Dongsung Kim, Dongho Yu, Ashwini Sawant, Mun Seok Choe, Ingeun Lee, Sung Gug Kim, EunMi Choi
Remote detection of radioactive materials is impossible when the measurement location is far from the radioactive source such that the leakage of high-energy photons or electrons from the source cannot be measured. Current technologies are less effective in this respect because they only allow the detection at distances to which the high-energy photons or electrons can reach the detector. Here we demonstrate an experimental method for remote detection of radioactive materials by inducing plasma breakdown with the high-power pulsed electromagnetic waves...
May 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28471343/influence-of-static-magnetic-fields-in-phototaxis-and-osmotic-stress-in-gymnodinium-catenatum-dinophyceae
#12
Paulo Vale
Phototaxis response of the toxic microalgae Gymnodinium catenatum was studied in vitro. The percentage of cells remaining at mid-depth 20 min after stirring increased with solar radio, X-ray and solar flares output. It also increased with geomagnetic activity and temperature, and was dependent on culture time. Increase in the local static magnetic field with a permanent magnet did not influence the positive phototaxis response. However, survival and growth to a provoked hypo-osmotic shock in an altered static magnetic field was dependent on culture time and geomagnetic activity at a threshold below 22 nT...
May 4, 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/28470981/active-phase-transition-via-loss-engineering-in-a-terahertz-mems-metamaterial
#13
Longqing Cong, Prakash Pitchappa, Chengkuo Lee, Ranjan Singh
Controlling the phase of local radiation by using exotic metasurfaces has enabled promising applications in a diversified set of electromagnetic wave manipulation such as anomalous wavefront deflection, flat lenses, and holograms. Here, we theoretically and experimentally demonstrate an active phase transition in a micro-electromechanical system-based metadevice where both the phase response and the dispersion of the metamaterial cavity are dynamically tailored. The phase transition is determined by the radiative and the absorptive losses in a metal-insulator-metal cavity that obeys the coupled-mode theory...
May 4, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28470342/ten-gigahertz-microwave-radiation-impairs-spatial-memory-enzymes-activity-and-histopathology-of-developing-mice-brain
#14
Archana Sharma, Kavindra Kumar Kesari, Virender Kumar Saxena, Rashmi Sisodia
For decades, there has been an increasing concern about the potential hazards of non-ionizing electromagnetic fields that are present in the environment and alarming as a major pollutant or electro-pollutant for health risk and neuronal diseases. Therefore, the objective of the present study was to explore the effects of 10 GHz microwave radiation on developing mice brain. Two weeks old mice were selected and divided into two groups (i) sham-exposed and (ii) microwave-exposed groups. Animals were exposed for 2 h/day for 15 consecutive days...
May 3, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28461547/use-of-electromagnetic-device-to-insert-postpyloric-feeding-tubes-in-a-pediatric-intensive-care-unit
#15
Ann-Marie Brown, Christine Perebzak, Colleen Handwork, M David Gothard, Kristine Nagy
BACKGROUND: The preferred route for providing nutrition in the pediatric intensive care unit is enteral. Placement of postpyloric feeding tubes using an electromagnetic-tipped stylet that emits a signal detected by a device held over the patient's abdomen is effective in adult intensive care units, but has not been well studied in pediatric units. OBJECTIVES: To determine the effectiveness of the electromagnetic device in reducing the numbers of radiation exposures, intrahospital transports, tubes used, and tube placement attempts in the pediatric intensive care unit...
May 2017: American Journal of Critical Care: An Official Publication, American Association of Critical-Care Nurses
https://www.readbyqxmd.com/read/28461458/photonic-hypercrystals-for-control-of-light-matter-interactions
#16
Tal Galfsky, Jie Gu, Evgenii E Narimanov, Vinod M Menon
Photonic crystals (PCs) have emerged as one of the most widely used platforms for controlling light-matter interaction in solid-state systems. They rely on Bragg scattering from wavelength-sized periodic modulation in the dielectric environment for manipulating the electromagnetic field. A complementary approach to manipulate light-matter interaction is offered by artificial media known as metamaterials that rely on the average response of deep-subwavelength unit cells. Here we demonstrate a class of artificial photonic media termed "photonic hypercrystals" (PHCs) that combine the large broadband photonic density of states provided by hyperbolic metamaterials with the light-scattering efficiency of PCs...
May 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28459678/multi-imager-compatible-mr-safe-remote-center-of-motion-needle-guide-robot
#17
Dan Stoianovici, Changhan Jun, Sunghwan Lim, Pan Li, Doru Petrisor, Stanley Fricke, Karun Sharma, Kevin Cleary
We report the development of a new robotic system for direct image-guided interventions, DIGI (images acquired at the time of the intervention). The manipulator uses our previously reported Pneumatic Step Motors and is entirely made of electrically nonconductive, nonmetallic, and nonmagnetic materials. It orients a needle-guide with 2 degrees of freedom (DoF) about a fulcrum point located below the guide using an innovative Remote Center of Motion (RCM) parallelogram type mechanism. The depth of manual needle insertion is preset with a 3rd DoF, located remotely of the manipulator...
April 25, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28458615/gravitational-waves-and-electrodynamics-new-perspectives
#18
Francisco Cabral, Francisco S N Lobo
Given the recent direct measurement of gravitational waves (GWs) by the LIGO-VIRGO collaboration, the coupling between electromagnetic fields and gravity have a special relevance since it opens new perspectives for future GW detectors and also potentially provides information on the physics of highly energetic GW sources. We explore such couplings using the field equations of electrodynamics on (pseudo) Riemann manifolds and apply it to the background of a GW, seen as a linear perturbation of Minkowski geometry...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28452557/time-reversal-symmetry-bounds-on-the-electromagnetic-response-of-asymmetric-structures
#19
Dimitrios L Sounas, Andrea Alù
Asymmetric structures support different field distributions and electromagnetic responses when excited from different directions. Here we show that time-reversal symmetry imposes fundamental constraints on their overall response, beyond those dictated by reciprocity. For two-port devices, the asymmetry in field distribution for opposite excitations is shown to be fundamentally bounded by the reflection at the ports, and the fields are identical everywhere in space in the case of full transmission. In multiport and open scenarios, these bounds have implications on radiation and scattering at different ports and towards different directions...
April 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28452537/turbulent-kinetic-energy-in-the-energy-balance-of-a-solar-flare
#20
E P Kontar, J E Perez, L K Harra, A A Kuznetsov, A G Emslie, N L S Jeffrey, N H Bian, B R Dennis
The energy released in solar flares derives from a reconfiguration of magnetic fields to a lower energy state, and is manifested in several forms, including bulk kinetic energy of the coronal mass ejection, acceleration of electrons and ions, and enhanced thermal energy that is ultimately radiated away across the electromagnetic spectrum from optical to x rays. Using an unprecedented set of coordinated observations, from a suite of instruments, we here report on a hitherto largely overlooked energy component-the kinetic energy associated with small-scale turbulent mass motions...
April 14, 2017: Physical Review Letters
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