N.A. Temuryants - Dr. Sc. (Biol.), V.I. Vernadsky Crimean Federal University, Simpheropl. E-mail: natemax@rambler.ru K.N. Tumanyants - Ph.D. (Biol.), V.I. Vernadsky Crimean Federal University, Simpheropl. E-mail: tumanyantsk@gmail.com

In the study of the influence of electromagnetic fields (EMF) of natural origin on biological objects an important part is played by experiments with electromagnetic shielding (EMS), which attenuates not only the static magnetic field of the earth, but also the alternating field of various ranges. The shielding chamber was manufactured of two layer iron Dinamo and was itself a room of dimensions 2x3x3 m. Its shielding properties were determined by means of measuring the spectral density of magnetic field (MF) in the freguency range from 10-4 to 105 Hz. In the range of infralow and low freguencies (0-100 Hz) the measurements were conducted with the aid of a ferroprobe magnetometer with sensitivity of I nT, the accuracy of measurement constituted ± 3%. In the region of higher freguencies (102-105 Hz) the measurements were conducted with the aid of a measuring coil and selective amplifier U2-8. Inside the chamber for freguencies from 10-4 to 30 Hz the shielding factor was within three-four, at industrial freguency 50 Hz and multiple harmonics 150 and 250 Hz - about three. At higher frequencies there is a tendency to weakening. The shielding factor for the static component of MF constituted: in the vertical constituent - 4,4 times, in the horizontal - 20 times. Nociception of mollusk are successfully used for studying the biological action of EMF of various parameters. Moderate electromagnetic shielding, which weakens variable and constant components of the geomagnetic field, causes the development of desynchronosis in mollusca. This desynchronosis can be diagnosed through characteristic changes in the infradian rhythmicity of nociception. Additional exposure of mollusca, who are kept under the EMS conditions, to low-intensity ultra-high frequency(UHF) electromagnetic radiation (EMR 42.2 GHz, 10 mW/sm2 power density) and to infra-low frequency (ILF) variable magnetic field (VMF 8 Hz, 50 nT) leads to alterations of the EMS-induced changes on periodic processes. ILF VMF stops the development of desynchronosis, whereas UHF EMR modifies its manifestations. Therefore, ILF VMF may be used to correct EMS- induced desynchronosis.

 

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