Action Of Electromagnetic Field Research Articles

Changes in antioxidant capacity of blood due to mutual action of electromagnetic field (1800 MHz) and opioid drug (tramadol) in animal model of persistent inflammatory state

BackgroundThe biological effects and health implications of electromagnetic field (EMF) associated with cellular mobile telephones and related wireless systems and devices have become a focus of international scientific interest and world-wide public concern. It has also been proved that EMF influences the production of reactive oxygen species (ROS) in different tissues. MethodsExperiments were performed in healthy rats and in rats with persistent inflammatory state induced by Complete Freund's Adjuvant (CFA) injection, which was given 24h before EMF exposure and drug application. Rats were injected with CFA or the same volume of paraffin oil into the plantar surface of the left hind paw. Animals were exposed to the far-field range of an antenna at 1800MHz with the additional modulation which was identical to that generated by mobile phone GSM 1800. Rats were given 15min exposure, or were sham-exposed with no voltage applied to the field generator in control groups. Immediately before EMF exposure, rats were injected intraperitoneally with tramadol in the 20mg/kg dose or vehicle in the 1ml/kg volume. ResultsOur study revealed that single EMF exposure in 1800MHz frequency significantly reduced antioxidant capacity both in healthy animals and those with paw inflammation. A certain synergic mode of action between applied electromagnetic fields and administered tramadol in rats treated with CFA was observed. ConclusionsThe aim of the study was to examine the possible, parallel/combined effects of electromagnetic radiation, artificially induced inflammation and a centrally-acting synthetic opioid analgesic drug, tramadol, (used in the treatment of severe pain) on the antioxidant capacity of blood of rats. The antioxidant capacity of blood of healthy rats was higher than that of rats which received only tramadol and were exposed to electromagnetic fields.

Термодинамические особенности кристаллогидратов хлорида кобальта, выращенных из растворов, подвергшихся действию ВЧ-поля

Термодинамические особенности кристаллогидратов хлорида кобальта, выращенных из растворов, подвергшихся действию ВЧ-поля

Interference of the mechanisms of influence that weak extremely low-frequency electromagnetic fields have on the human body and animals

This review is devoted to the problem of interference between the mechanisms of biological action of natural and artificial electromagnetic fields (EMFs) for different levels of the organization of life. We discuss the problem of specific and nonspecific responses of the human body and animals to the action of EMFs on cellular and organismal levels.

Electromagnetic Gauges and Maxwell Lagrangians Applied to the Determination of Curvature in the Space-Time and their Applications

If we consider the finite actions of electromagnetic fields in Hamiltonian regime and use vector bundles of geodesic in movement of the charges with a shape operator (connection) that measures the curvature of a geometrical space on these geodesic (using the light caused from these points (charges) acting with the infinite null of gravitational field (background)) we can establish a model of the curvature through gauges inside the electromagnetic context. In partular this point of view is useful when it is about to go on in a quantized version from the curvature where the space is distorted by the interactions between particles. This demonstrates that curvature and torsion effect in the space-time are caused in the quantum dimension as back-reaction effects in photon propagation. Also this permits the observational verification and encodes of the gravity through of light fields deformations. The much theoretical information obtained using the observable effects like distortions is used to establish inside this Lagrangian context a classification of useful spaces of electro-dynamic configuration for the description of different interactions of field in the Universe related with gravity. We propose and design one detector of curvature using a cosmic censor of the space-time developed through distortional 3-dimensional sphere. Some technological applications of the used methods are exhibited.

Charged Perfect Fluid Cylindrical Gravitational Collapse

This paper is devoted to study the charged perfect fluid cylindrical gravitational collapse. For this purpose, we find a new analytical solution of the field equations for non-static cylindrically symmetric spacetime. We discuss physical properties of the solution which predict gravitational collapse. It is concluded that in the presence of electromagnetic field the outgoing gravitational waves are absent. Further, it turns out that when longitudinal length reduces to zero due to resultant action of gravity and electromagnetic field, then the end state of the gravitational collapse is a conical singularity. We also explore the smooth matching of the collapsing cylindrical solution to a static cylindrically symmetric solution. In this matching, we take a special choice of constant radius of the boundary surface. We conclude that the gravitational and Coulomb forces of the system balance each other.

Structural features of alloy 1417M of the Al – Ce system obtained with the use of electromagnetic effect in the process of crystallization

The effect of electromagnetic field in the process of crystallization on the kind of structure formed in alloy 1417M of the Al – Ce system is studied. The action of electromagnetic field on the morphology and dispersity of the eutectic component is determined. The size of the eutectic component is shown to be dependent on the diameter of the cast preform.

Electromagnetic screening of the elements of a high-voltage vacuum divider

The efficiency of constructional-technological measures for screening the most vulnerable components of high-voltage vacuum capacitive dividers, which are exposed during use to the destabilizing actions of intense external electromagnetic fields, is estimated.

Influence of pulsed magnetic fields on the morphology of bone cells in early stages of growth

The effect of electromagnetic fields on living systems has been studied both in vivo and in vitro in a wide range of organisms, cells and tissues. However, the mechanism of action of electromagnetic fields is not yet clearly defined. This paper presents the results of applying a pulsed magnetic field of 70 ms width, intensity of 0.65 mT at 4 Hz in human osteoblasts, during 45 min. The magnetic field application was conducted on crops of both 24 and 48 h of proliferation. The effect of applying magnetic fields was assessed using parameters such as cell density, protein content, distribution of F-actin fibrils and β-tubulin and integrity of nuclear structure. The results indicate no alteration in either protein synthesis or nuclear structure, or in the number of cells. However, we observed that exposure to these fields induces changes in the distribution of cytoskeletal proteins of osteoblasts.

Dynamics and Infradian Rhythmics of Thermal/Pain Sensitivity of the Helix Mollusc under the Action of Electromagnetic Fields

We measured characteristics of thermal/pain (th/p) sensitivity of Helix albescens (threshold and latency of the avoidance behavioral reaction) under conditions of the hot-plate test. As was found, weakening (shielding) of the background electromagnetic field, as well as the action of low-intensity radiations of extremalfrequency ranges, induced two-phase changes of these characteristics within a 21-day-long observation period with different manifestations and durations of the phases. Initial increase in the nociceptive sensitivity (hyperalgesia) was followed by an analgesic effect with subsequent return of the examined indices to the initial level. Low-intensity electromagnetic influences also induced modifications of the infradian rhythmics of th/p sensitivity of the molluscs; this was manifested in changes of the spectra and phase shifts of the identified rhythms and trends toward modulation of the amplitudes of these rhythmic components.

On the scaling rules for the anomaly-induced effective action of metric and electromagnetic field

The anomaly-induced effective action is a useful tool for deriving the contributions coming from quantum effects of massless conformal fields. It is well known that such corrections in the higher derivative vacuum sector of the gravitational action provide the same exponential inflation (Starobinsky model) as the cosmological constant term. At the same time, the presence of a classical electromagnetic field breaks down the exponential solution. In this Letter we explore the role of the anomaly-induced term in the radiation sector and, furthermore, derive the “equation of state” and the scaling laws for all terms in the Einstein equations. As one could expect, the scaling law for the vacuum anomaly-induced effective action is the same as for the cosmological constant.

Electromagnetic Field Treatment Protects Against and Reverses Cognitive Impairment in Alzheimer's Disease Mice

Despite numerous studies, there is no definitive evidence that high-frequency electromagnetic field (EMF) exposure is a risk to human health. To the contrary, this report presents the first evidence that long-term EMF exposure directly associated with cell phone use (918 MHz; 0.25 w/kg) provides cognitive benefits. Both cognitive-protective and cognitive-enhancing effects of EMF exposure were discovered for both normal mice and transgenic mice destined to develop Alzheimer's-like cognitive impairment. The cognitive interference task utilized in this study was designed from, and measure-for-measure analogous to, a human cognitive interference task. In Alzheimer's disease mice, long-term EMF exposure reduced brain amyloid-beta (Abeta) deposition through Abeta anti-aggregation actions and increased brain temperature during exposure periods. Several inter-related mechanisms of EMF action are proposed, including increased Abeta clearance from the brains of Alzheimer's disease mice, increased neuronal activity, and increased cerebral blood flow. Although caution should be taken in extrapolating these mouse studies to humans, we conclude that EMF exposure may represent a non-invasive, non-pharmacologic therapeutic against Alzheimer's disease and an effective memory-enhancing approach in general.

Thermal stressed state of a conducting ball under the action of pulsed electromagnetic fields

We pose the dynamic centrally symmetric problem of thermomechanics for a continuous conducting ball subjected to the nonstationary uniform electromagnetic action and propose a method for its solution based on the use of the cubic approximation of the azimuthal component of the magnetic vector and the radial component of the stress tensor in the radial coordinate. The solution of the problem is obtained and the thermal stressed state of the ball under the action of electromagnetic pulses is numerically investigated.

Noise-proof pyroelectric calorimeter for spectroenergetic measurements in the vacuum ultraviolet

A pyroelectric calorimeter with spectral selection of radiation, implemented with a set of crystalline and gas filters, is intended for the measurement of the spectroenergetic characteristics of powerful pulsed plasma radiators in the vacuum ultraviolet region. A system of measures has been developed to protect it from the action of high-speed plasma jets and pulsed electromagnetic fields. Energy calibration of the calorimeter has been carried out.

Microstructure and Tensile Property of Zn-Al Alloy Reinforced with Titanium Produced by Electrolysis

In this study, some low-titanium aluminum alloys produced by electrolysis were prepared and the effect of various titanium contents on microstructure and tensile property of Zn-Al alloy was investigated. The test results showed that addition of titanium by electrolysis is an effective way to refine the grain size of Zn-Al alloy. As the titanium content is 0.04 wt%, the grain size becomes to be a minimum value and the tensile property of the alloy reaches to the maximum. Electrolysis showed that titanium atoms are to be some inherent particles in low-titanium aluminum alloy. These titanium atoms enter into the aluminum melt liquid and spread to the whole melt rapidly under stirring action of electromagnetic field of the electric current. The heterogeneous phase nuclei are high melting TiC and TiAl3 particles formed from in-situ precipitating trace C and Ti during cooling process. These in-situ precipitating heterogeneous nucleation sites with small dimension, high dispersity, cleaning interface and fine soakage with melt, have better capacity of heterogeneous nucleation than of exotic particles. It may inhibit grain growth faster and more effective in pinning dislocations, grain boundaries or sub-boundaries.

Emission phenomena in a SHS combustion wave

There are numerous experimental data indicating that the action of electromagnetic and magnetic fields on the combustion wave of self-propagating high-temperature synthesis (SHS) changes the process kinetics and the structure and properties of the reaction products. Emission phenomena in the combustion wave have received less attention. High rates of chemical energy dissipation in SHS (1012 W/m3) are accompanied by physical phenomena such as the occurrence of a potential difference between the combustion front and reaction products, free electron emission from the combustion wave, and acoustic emission. Detailed studies of these nonequilibrium phenomena provide a deeper understanding of the reaction mechanism in solid flames to use nonthermal methods of combustion control.

Influence of low-intensity physical factors on plant growth indices: 1. Alternating magnetic fields and salt solutions

This paper is devoted to barley seeds processed by their soaking in sodium, potassium, calcium, and magnesium solutions with the action of simultaneous alternating electromagnetic fields (EMF), which considerably influence their growth under regular conditions. The efficiency of the combined salts and EMF action is maximum for potassium and minimal for magnesium. The EMF biological effect under the conditions of the substrate salinization depends on the field frequency—the metal ions’ accumulation may increase, decrease, or remain unchanged. Each ion is characterized by its own frequency spectrum of efficiency.

Dynamic Model for Metal Cleanness Evaluation by Melting in a Cold Crucible

Melting of metallic samples in a cold crucible causes inclusions to concentrate on the surface owing to the action of the electromagnetic force in the skin layer. This process is dynamic, involving the melting stage, then quasi-stationary particle separation, and finally the solidification in the cold crucible. The proposed modeling technique is based on the pseudospectral solution method for coupled turbulent fluid flow, thermal and electromagnetic fields within the time varying fluid volume contained by the free surface, and partially the solid crucible wall. The model uses two methods for particle tracking: (1) a direct Lagrangian particle path computation and (2) a drifting concentration model. Lagrangian tracking is implemented for arbitrary unsteady flow. A specific numerical time integration scheme is implemented using implicit advancement that permits relatively large time-steps in the Lagrangian model. The drifting concentration model is based on a local equilibrium drift velocity assumption. Both methods are compared and demonstrated to give qualitatively similar results for stationary flow situations. The particular results presented are obtained for iron alloys. Small size particles of the order of 1 μm are shown to be less prone to separation by electromagnetic field action. In contrast, larger particles, 10 to 100 μm, are easily “trapped” by the electromagnetic field and stay on the sample surface at predetermined locations depending on their size and properties. The model allows optimization for melting power, geometry, and solidification rate.

Exposure to Oscillating High Electrical Potential and the Associated Low Frequency Magnetic Field Enhances the Hepatoprotective Action of Schisandrin B in Vivo and in Vitro

The effect of electromagnetic manipulation (EM), consisting of an oscillating (50 Hz) high electrical potential (a maximum value of 20,000 V and an output current < 100 µA) and its associated alternating magnetic field (50-60 Guass), on the hepatoprotective action of schisandrin B (Sch B, an active ingredient isolated from the fruit of Schisandra chinensis) was examined in the mouse model of carbon tetrachloride (CCl4) hepatotoxicity and the AML12 cell model of menadione-induced toxicity. EM was found to enhance the Sch B-induced hepatoprotective action against CCl4 toxicity in mice and cytoprotective action against menadione toxicity in AML12 hepatocytes. The potentiating effect of EM on the pharmacological action of Sch B may be mediated by the increase in drug availability to tissues or cells and/or the pro-oxidant action of electromagnetic field in vivo.

Enhancing operational efficiency of gas-liquid reactor under the action of electromagnetic field

Sulfite method (absorption of air oxygen with Na2SO3 in the presence of CuSO4, followed by reaction) has been used to determine the operational efficiency of an experimental gas-liquid reactor under the action of electromagnetic field. The dependence of the sulfite number on the volumetric gas flow, the volume of the magnetic balls in the reaction space of the reactor, and the power of the electric field for creation of electromagnetic field has been determined. It has been found that the sulfite number in the reactor goes up 3–7 times under the action of electromagnetic field.

Development of cell hypoxia induced by factors of long-term spaceflight

308 Changes in erythrocyte shape and plasma membrane viscosity and selective permeability were studied as well as the content of oxygen and the efficiency of its retention by human erythrocytic hemoglobin after a long-term spaceflight (LSF) were determined. It has been found that 24 h after LSF, the discocyte count decreases, the plasma membrane viscosity and the activities of Na + /H + exchange and Ca 2+ -dependent a + channel increase, Ca 2+ -ATPase activity and the hemoglobin content decrease, and the efficiency of O 2 retention by hemoglobin increases. It is assumed that the detected changes are the cellular factors that are involved in hypoxia development in humans during LSF. LSF factors (zero gravity, the action of electromagnetic fields and radiation, hypodynamia, and psychological stress) cause integrated changes in the red blood lineage of cosmonauts [1‐6]. Decrease in the erythrocyte count and hemoglobin content accompanied by an increase in the count of transformed erythrocytes, changes in the plasma membrane permeability and cell metabolism, increase in the relative cholesterol concentration, and decrease in the level of phospholipids in the plasma membrane have been recorded [2, 7]. A decrease in the ATP content both during and after LSF is associated with the activation of active ion transport, possible changes in the state of plasma membrane, and altered hemoglobin synthesis. It is important that the LSF factors cause changes in both the hemoglobin composition (increase in the fraction of A 2 hemoglobin and methemoglobin and decrease in the activity of methemoglobin reductase) and physicochemical properties of globin (shift in hemoglobin isoelectric point to the alkaline region) [6]. Characteristic changes in the erythrocyte shape caused by the LSF factors have been detected. More precisely, the specific morphological features of the erythrocyte include changes in the diameter, hemoglobin content and concentration, and cell thickness and volume. Erythrocyte has the shape of a biconcave disc, which is optimal for the oxygen diffusion into the cell. In the case of spherical erythrocytes, the central part of the cell is less saturated with oxygen than the surface layers. In addition, erythrocyte in this case loses the ability to rapidly and reversibly change its configuration to pass freely through the spleen capillaries and sinuses. This may considerably influence its lifespan [6, 7]. The decreased count of discocytes and increased counts of transformed erythrocyte forms (spherocytes, stomatocytes, knizocytes, and echinocytes) is observed during the first days after LSF [2]. It has been found that the average erythrocyte volume, thickness, and specificity increase after LSF, whereas the average surface area decreases. LSF influences not only the cell shape, but also the electrophoretic mobility of hemoglobin molecule, which is likely to be accompanied by changes in the protein redistribution in the cytoplasm. We have earlier demonstrated that characteristic changes in the erythrocyte shape and volume as well as the cell plasma membrane viscosity and permeability