Effect Of Radiofrequency Waves Research Articles

The Effect of Radiofrequency Waves on Pregnant Mice in Association with Genes Involved in Neuronal Migration

Objective: We aimed to evaluate alterations in expression of the genes, which are known to have a role in neuronal migration by the administration of daily life exposure doses of radiofrequency to pregnant mice. Material and Methods: Two groups were established. Each of them contained 6 female, 2 male Balb/c mice. They were weighted 15-20 g. For the occurrence of pregnancy, male and female mice were placed in cages mixed. The study and control groups were exposed to the radiofrequency field with the average specific absorption rate value of 0.725 W/kg, 12 hours a day until birth. Total RNA and cDNA were obtained from postnatal brain tissue of newborn mice. Alterations in the expression of 7 (ARX, FLNA, DCX, LARGE, RELN, TUBA1, YWHA) genes that are known to have a role in neuronal migration were investigated by real-time polymerase chain reaction. Results: The expressions of 6 of the 7 genes were found to be significantly increased. These genes were ARX, FLNA, DCX, LARGE, RELN and YWHAE. This study proved that even at low levels, magnetic field may affect the development of foetuses as a consequence of gene expression changes. Conclusion: Magnetic field may affect foetusess during pregnancy and precautions must be taken to prevent exposure.

Effect of radio frequency waves on plasma

Effect of radio frequency waves on plasma

The mechanism of beneficial effect of radiofrequency therapy on masticatory muscles in temporomandibular disorders - a literature review.

Temporomandibular disorders (TMD) is one of the most common problem in contemporary dentistry. It is a term covering dysfunction of the masticatory muscles and the temporomandibular joints. Patients are suffering from severe pain, followed by limited mandibular opening and sounds in the temporomandibular joints during jaw movement. TMD influences the quality of life because the symptoms can become chronic and difficult to manage. Radiofrequency waves (RF) are electromagnetic waves with low energy and high frequency. They provide pain relief without causing significant damage to the nervous tissue. The RF therapy is commonly used for physiotherapeutic treatment of skeletal muscle relaxation, as a supportive therapy. The rehabilitation effect of these waves is based on diathermy by means of high-voltage quick alternating current. RF has also found application in physical therapy, as a therapeutic tool for various types of chronic pain syndromes. The aim of this literature review is to show the beneficial effect of radiofrequency waves on the pain of the masticatory muscles in the course of TMD.

Evaluation of the effects of radio frequency waves and mobile phone distance on cow brain tissue temperature

Evaluation of the effects of radio frequency waves and mobile phone distance on cow brain tissue temperature

Gyrokinetic simulation on the effect of radio frequency waves on ion-temperature-gradient-driven modes: Part II – transport analysis

ABSTRACTIn our earlier work [Imadera et al. REDS Plasma Sci. Technol., 2016, 171, 52], the ion-temperature-driven modes were studied in the presence of radio frequency (RF) waves by the use of gyrokinetic simulation code. It was shown that the RF waves through the ponderomotive force can stabilize the ion-temperature-gradient instabilities and contrary to the usual belief no RF wave-induced flow generation hypothesis was required. This might be a major way to explain many unknowns in the space plasma and can also help to create a transport barrier in the fusion energy generation. In this work, we extend our earlier work to investigate the consequent transport and report the effect on the ion turbulent diffusivity.

Gyrokinetic simulation on the effect of radio frequency waves on ion-temperature-gradient-driven modes

ABSTRACTThe ion-temperature-driven modes are studied in the presence of radio frequency waves by the use of the Gyro-Kinetic simulation Code. It is shown that the radio frequency waves through the ponderomotive force can stabilise the ion-temperature-gradient instabilities and contrary to the usual belief no radio frequency wave-induced flow generation hypothesis is required. This might be a major way to create a transport barrier in the fusion energy generation.

The proposed mechanisms of radio frequency waves (RFWs) on nervous system functions impairment

There is a general concern regarding the hazardous health effects of exposure to radiofrequency waves (RFWs) emitted from wireless communication devices. RFWs generated by base transceiver station (BTS) and/or mobile phone have been reported to generate deleterious effects on nervous system, possibly through the non-thermal effects and thermal effects. However, most studies have focused on the non-thermal effects of RFW. In this review, we will consider effects of radiofrequency waves on impairment of nervous system functions. Available data indicate that RFW of relatively low intensity (specific absorption rate (SAR) <2 W/kg) can affect the nervous system. Parameters of RFW exposure, such as frequency, duration, waveform, frequency and amplitude modulation, etc., are important determinants of biological responses. Changes in electrophysiology, blood-brain barrier, morphology, neurotransmitter functions, structural and functional changes in the cell membrane (i.e., NADH oxidase, phosphatidylserine, and voltage-gated calcium channels), genetic effects, and oxidative stress as an important factor have recently been reported in the brain of animals and humans after exposure to RFWs. These changes can lead to functional changes in the nervous system.

Effects of radio frequency waves on plasmas

A novel technique is proposed for creating transport barriers by the rf waves. This is that the transport barriers can be created by the rf induced ponderomotive force itself and no rf induced flow shear generation is necessary. It is demonstrated that the ponderomotive force of the rf waves can stabilize the ion temperature gradient mode, considered nowadays as the dominant source of anomalous energy losses in the low confinement (L) mode. The underlying physics of this stabilization mechanism is identified and is found to be rather general in the sense that all potential drift-like instabilities are expected to be affected in a similar way. It is also shown that this stabilization can be achieved for rather modest values of the rf power, and, hence should be easily obtained in actual fusion devices. Applications to other areas are also discussed.

Effect of Radio Frequency Waves of Electromagnetic Field on the Tubulin

Microtubules (MTs) are macromolecular structures consisting of tubulin heterodimers and present in almost every eukaryotic cell. MTs fulfill all conditions for generation of electromagnetic field and are electrically polar due to the electrical polarity of a tubulin heterodimer. The calculated static electric dipole moment of about 1000 Debye makes them capable of being aligned parallel to the applied electromagnetic field direction. In the present study, the tubulin heterodimers were extracted and purified from the rat brains. MTs were obtained by polymerization in vitro. Samples of microtubules were adsorbed in the absence and in the presence of electromagnetic fields with radio frequency of 900 Hz. Our results demonstrate the effect of electromagnetic field with 900 Hz frequency to change the structure of MTs. In this paper, a related patent was used that will help to better understand the studied subject.

The effect of radiofrequency waves produced by cell phones on the semen quality of infertile men

The effect of radiofrequency waves produced by cell phones on the semen quality of infertile men

Radiofrequency Shielding by Polypyrrole-Coated Nano and Regular Fibrous Mats

This work investigates radiofrequency shielding by polypyrrole (PPy)-coated fibrous mats consisting of nano and regular fibers. Radiofrequency shielding protects human beings as well as electronic devices from the harmful effects of radiofrequency waves. The results of this study show that, generally, lowering the fiber diameter of the coated mats increases the reflection but decreases the absorption of radiofrequency radiation in the range of 5 GHz to 8 GHz. Moreover, absorption of higher frequencies is greater than that of lower frequencies, whereas for reflection the opposite trend is observed. The sum of absorption and reflection of radiofrequencies in the range of 5 GHz to 8 GHz by PPy-coated mats is not affected by the fiber diameter of the mats. PPycoated regular poly(acrylonitrile) (PAN) and poly(ethylene terephthalate) (PET) fiber mats with weight per unit area of 16.67 mg/cm 2 provide radiofrequency shielding above 85%. Nanofibrous mats with weight per unit area of nearly 60 times less showed similar radiofrequency shielding effectiveness as regular fiber mats, highlighting the importance of the high specific surface area of nanofibers.

A theoretical analysis of the effects of radio frequency waves on interchange stability in mirror plasmas

A theoretical study is made of the effects of radio frequency (rf) waves in the range of ion cyclotron frequency on interchange modes in mirror plasmas. A two-fluid cold plasma model including particle collisions is utilized for the investigation. Both the equilibrium ponderomotive force produced by the gradient of rf wave amplitude and the sideband wave coupling mechanism originated from the nonlinear beating between high frequency waves are taken into account. A tractable form of the dispersion relation for the interchange mode is obtained and applied to carrying out a parametric study. Key parameters affecting the stability boundary are identified and the consequences of the parameter variation on the stability boundary change are analyzed near ion cyclotron resonance region.

Kinetic theory of interaction of high frequency waves with a rotating plasma

The equations of motion of charged particles of a strongly magnetized flowing plasma under the influence of high frequency waves are derived in the guiding center approximation. A quasilinear theory of the interactions of waves with rotating plasmas is formulated. This is applied to investigate the effect of radio frequency waves on a rotating tokamak plasma with a heated minority species. The angular momentum drive is mainly due to the rf-induced radial minority current. The return current by the bulk plasma gives an equal and opposite rotation drive on the bulk. Using moment equations and a small banana width approximation, the J×B drive was evaluated for the bulk plasma. Quite remarkably, although collisions are included, the net rotation drive is due to a term which can be obtained by neglecting collisions.

New characteristics of oxido-reduction reaction of KI and KMnO 4 irradiated by amplitude-modulated electromagnetic waves

The influence of static electric and magnetic fields on chemical reactions has been studied for many years. It has been known in spectrum analyses that materials absorb microwave energy resonantly, which shows the effect of microwave on the energy level of molecules. Now the effect of radio-frequency waves, especially microwaves, on chemical reactions is attracting scientists attention.

The effects of radio frequency waves on the sputtering of ion cyclotron resonance heating antenna Faraday shields

The sputtering of the graphite covered Faraday shield of an ion cyclotron resonance heating loop antenna has been studied. The antenna operated at 50 MHz and was exposed to a weakly magnetized plasma produced by the High Particle Flux Facility at Oak Ridge National Laboratory. The flux at the antenna was on the order of 3×1017 cm−2 s−1. A dc bias voltage applied to the antenna allowed the effective energy of the impinging hydrogen ions to be varied up to 65 eV. Coupled rf power varied from 0 to 3 kW. Sputtering depths were directly measured by surface topography. Sputtering enhancement due to rf was between a factor of 2 to 4, depending on the position along the antenna. Antenna voltage profiles were calculated and used to correlate measured erosion coefficients with ion energies. Various sputtering theories and possible chemical sputtering effects are discussed.

Studies on the Effect of Radio-Frequency Waves on Biological Macromolecules

The effect of radio-frequency electric fields on various biologic materials was examined. Particularly, the effects on alcohol dehydrogenase and DNA were carefully investigated. To avoid the effects of heating, a pulsed electric field was used, and samples were also rigorously cooled. The activity of alcohol dehydrogenase and the structure of DNA were not altered, however, even by the prolonged irradiation at high-field intensity between 1 and about 60 Mc/s.