Electromagnetic Field Irradiation Research Articles

Stimulation of propagation of para-rubber tree grafts using electromagnetic field irradiation

Para Rubber trees (Hevea brasiliensis Müll.Arg.) are an important tree crop in Southern Thailand not only for latex but also for timber. Graft budding is normally used for propagation (≈3–4 months) followed by ~ 12 months in a nursery to become plantable young trees. The propagation method is slow, prone to diseases, has a low success rate and high labour costs. Magnetic field treatment was used to stimulate and accelerate sprouting of graftings separated into two main groups. The control group were treated using standard bud-grafting methods and watered with unmagnetised water. The second group were exposed to magnetic fields with field intensity ranging from 2 to 3.2 mT for times ranging from 1 to 5 h. After magnetic treatment the plants were divided into two subgroups: (1) no further magnetic treatments and watered daily with ordinary water, (2) the second sub-group was watered daily with magnetically treated water. Three replications were conducted. Graftings exposed to a magnetic field of 2–3.2 mT for 5 h grew with up to a 70% sprouting rate within 3 weeks, whereas the control graftings survived but with no sprouting. The lowest magnetic irradiation dose (time × intensity) had the lowest sprouting rate. Watering with magnetized water increased the growth rate of the magnetically irradiated plants. After 2 months, the magnetically irradiated plants, watered with magnetized water had an average height of 60 cm. Magnetic field treatment stimulated sprouting of rubber tree grafts and the shoots grew faster than normal. Faster propagation minimizes possible disease losses.

Study of the effects of ultra-low intensity electromagnetic fields on biological objects

The object of research is the efficiency of exposure to electromagnetic field (EMF) of ultra-low intensity on biological objects, which is formed by a generator of broadband radiation. The principle of action of the generator is based on formation of electromagnetic radiation induced by periodic pulsed gas discharge in coaxial system of electrodes, which is loaded on a dielectric rod antenna. The method of selection of signals and corresponding equipment, which energy characteristics of radiation correspond to the criterion of non-thermal influence on bioobjects, is developed for obtaining a comparative assessment of influence bioefficiency. The proposed new method for processing experimental data using statistical calculations that meet the requirements for the processing and interpretation of the results. The seeds of wheat and interaction of millimeter range electromagnetic oscillations with bone marrow cells of rats were used as biological objects for investigating the effect of millimeter range electromagnetic oscillations. A biosensory effect was obtained when exposed to broadband radiation of ultra-low intensity, compared to the control sample. A change in the properties of the seeds, in particular, heat resistance, is observed. According to the experimental data, seeds turn out to be less susceptible to heat as a result of their pretreatment with EMF. The biological response is observed to depend on the frequency and time of irradiation. Also, the dependence of the decrease in the number of dead cells on the time of EMF irradiation was experimentally proved. The equation of dependence of selective average proportion of dead cells in rat bone marrow on irradiation time was calculated. Biosensory effect of exposure to broadband ultra-low intensity EMF of the developed emitter was revealed. It was established and statistically proved that the minimum time with the maximum positive effect of exposure to electromagnetic radiation of millimeter range on bone marrow cells of rats is 30 minutes, compared with an unirradiated sample. The results make it possible to evaluate the positive effect of electromagnetic oscillations on biological objects and propose the results of studies for practical use in the development of medical systems.

Detrimental Effect of Mobile Phone Electromagnetic Field on Permeability of Blood-Brain Barrier

Background: Exposure to different frequencies would have a profound effect on the brain tissue extract supernatant’s optical density and hexakis-2-methoxyisobutylisonitrile (99mTc-MIBI) build-up. Objectives: This study aimed to investigate the blood-brain barrier permeability after electromagnetic field irradiation. Methods: In this study, 150 male albino rats were randomly divided into 25 groups. They had an intraperitoneal injection of Evans blue 24 hours before experiments. Before 15 or 30-min Electromagnetic Field (EMF) irradiation (900, 1700, and 1900 MHz), 500 μCi (18.5 MBq) of 99mTc -MIBI was injected via the caudal vein. The rats decapitated 15, 30, 45, or 60 min after radiotracer injection to evaluate the brain-specific activity and brain tissue extract supernatant’s optical density. Results: No significant difference was found between the groups in 60-min post-injection activity after 15-min EMF radiation at 900, 1700, and 1900 MHz. The brain-specific activity with 30-min EMF radiation showed a significant increase in the 900 MHz group compared to others. Brain/whole body-specific activity in all experimental groups after 15-min EMF radiation showed no significant differences. On the other hand, the brain/whole body-specific activity ratio with 30-min EMF radiation showed a significant increase in the 900 MHz group compared to other groups. A comparison between the brain tissue extract supernatant’s optical density in the experimental groups after 15 and 30-min EMF radiation showed no significant difference in Evans blue accumulations in brains. Conclusions: It may be concluded that mobile phone electromagnetic field radiation may increase the blood-brain barrier permeability. As most humans use mobile phones for daily communications, all users around the world need to be advised of the effects of modern call devices.

Field theory model of brain extracellular matrix

The perineural net (PNN) is responsible for synaptic stabilization of adult brain. It plays an important role in brain signal processing and non-synaptic signal transfer as well [ 1]. Since it is composed of largely negatively charged chains of disaccharides, it can be easily affected by strong external electromagnetic field irradiated by high-energy particles passing brain tissues. One of the effects of such exposure is a cognitive impairment. Since outside of the Bragg peak area local electromagnetic field irradiation strong enough to affect on the PNN's dynamics, it is very important to understand PNN's behavior in locally strong electromagnetic fields. The presented work is devoted to PNN modeling in field theory framework. As a toy model of PNN, we consider fractal lattice with Ising and XY model applied. More precise study requires application of the quantum electrodynamics on the lattice. We study how local excitations can change phase state of the overall lattice and its finite clusters. For this propose, the partition function of the Ising model is calculated using Monte Carlo simulation [ 2]. The two-dimensional Serpinsky Carpet lattice is applied to approximate structure of the brain extracellular matrix. Order parameter is calculated for different levels of the self-similarity of the Serpinsky Carpet. It is shown that starting from the level = 3, the lattice with fractal structure has irreversible phase transition: phase state after restoration differs from the initial one. In Fig. 1, the calculation of the correlation length change due to the energy dissipation after a local impact is shown. The column shows correlation strength (from 0 to 1), the right axis shows the cluster size ratio to the whole lattice size in percentage. The initial lattice was totally correlated (100% of the lattice has correlation strength that equals 1). The left side of the picture corresponds the locally excited lattice with no correlation, the right side of the picture corresponds the lattice after the relaxation to the equilibrium state due to the energy dissipation. It can be clearly seen that the lattice is not correlated after the relaxation. Fig. 1.Correlation length change due to the energy dissipation.ConclusionsLocal impact changes the correlation length of the fractal lattice: after the restoration, the correlation length becomes short, thus signal processing on the lattice changes significantly. Thus, it can be considered as a good model to study of the extracellular matrix change due to local excitations of strong electromagnetic field.

Electron dwell time through a quantum wire under a electromagnetic field irradiation

We study theoretically the dwell time for electrons travelling through a quantum wire irradiated under a transversely-polarized external electromagnetic field. Using the semiclassical method of an atom interaction with single-mode field originally proposed in quantum optics, we obtain a two-level electron-field interaction wavefunction in the framework of free-electron approximation. Consequently, using this wavefunction the electron dwell time through the quantum wire is calculated in accord with transport property.

Floquet scattering approach to electron transport for a quantum wire under longitudinallypolarized electromagnetic field irradiation

We theoretically study the electron transport property for a semiconductor quantum wireirradiated under a longitudinally polarized electromagnetic field within a finite range. Weobtain the non-perturbative solutions of the single-electron time-dependent Schrödingerequation both inside and outside the field-irradiated region of the wire according tothe Floquet theorem. A general infinite matrix equation which determines theFloquet scattering coefficients is derived straightforwardly through the wavefunctionmatching scheme at the two interfaces between regions with and without fieldirradiation. The examples of numerically calculated transmission dependenceon the electron incident energy for different field parameters exhibit both Fanoand Rabi resonances, and the structure of the transmission is sensitive to thefield parameters of amplitude and frequency as well as the irradiation length.

Spin current and noise in a mesoscopic ring under a quantum electromagnetic field irradiation

We have investigated the behaviors of spin transport in a mesoscopic ring interacting with a quantum electromagnetic field (QEMF). The mesoscopic ring is described by a non-interacting one-dimensional electron system. The QEMF is considered to be in coherent state (CS) or in squeezed coherent state (SCS) separately. This induces nonclassical AB and AC effects, and the novel dynamic spin current is associated with the U ( 1 ) × SU ( 2 ) gauge quantum field. The phase oscillations and spin current noise are derived by considering the spin fluctuations in a particular QEMF state. The Zeeman split term takes effect in the spin current formula for a state, while it disappears as ω → 0 . This means that there is no persistent spin current contributed by static scalar AC effect. The spin current noise exhibits nonclassical behaviors in our system. This indicates the situation that quantum effects are transferred to the spin current. The spin current and spin current noise versus photon energy exhibit stair-like behaviors which are different in different QEMF.

Conductivity of low-and high-Tc metal-type superconducting weak-links under electromagnetic field irradiation

We present comprehensive experimental results of our investigations of electromagnetic field influence in a wide range of frequencies 103÷1010 Hz on the critical current, energy gap and Andreev-reflection features. Peculiarities of adiabatic and nonadiabatic regimes photons absorption by quasiparticles for both conventional and high-Tc superconducting weak-links are discussed. The obtained results are compared with theoretical models.