Biomedical subjects
Publications and source records attributed to Iu D Dumanskiĭ.
Experiments on white rats showed that electromagnetic radiation (24 MHz, 400 W/m and 20 W/m) caused leucopenia, reduction of E and EAC rosette formation of lymphocytes, functional activity of neutrophils within 2 months of radiation. No immunosuppressive effect was seen with 24 MHz, 100 W/m radiation, while 400 W/m inhibited E-rosette formation in the presence of tissue antigens.
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A study of behavioural reactions indicates that the effect of 24 MHz frequencies of the electromagnetic field results in changes of the ratio of excitatory and inhibitory processes in the nervous system of white rats with prevalence of inhibitory processes. By the 90-th day of effect of the above factor all changes returned to the initial level. This indicates stability of the adaptative reactions of the integrative level of the nervous system to the acting factor.
A detailed overview of a transmitting antenna of the decameter range is provided. It is shown that the field near such antennas has rather a complex structure. A comparative analysis of the existing design techniques for the determination of electromagnetic field intensity has been undertaken. On the basis of numerical design techniques the procedure of automated prediction of the electromagnetic situation is proposed. The basic components of the procedure are set forth. As illustrated by some antennas the dependence of sanitary and limitation zones on the wavelength, radiated power and the type of soil has been studied.
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A brief review is presented of the new views and methodological approach in hygienic standardization of the combined effect of the physical factors of the environment - ultrahigh frequency electromagnetic energy and noise. In the determination of the biological significance of the factors with their isolated or combined effect and integral logarithmic scale was introduced for the levels studied - the value of the factors, expressed in dB. The results from noise effect of the order 80 dB [A], ultrahigh frequency (UHE) - electromagnetic energy (P = 60 microW/cm2) and their combination reveal the ratio of the restoration periods I:I.9:2.6. Reduced to the logarithmic scale, the identical noise levels and UHF- electromagnetic energy (according to the exemplary result) have different biological significance. If the biological significance of noise is accepted as unity then the activity of the electromagnetic energy from UHF-range is with I.35 higher than that of the noise. With the combined effect of those factors reduced to an integral scale of the levels, the relative biological significance of the noise, electromagnetic energy and their combination has the values I:I.35:2.I. In that way of processing and analysis of the results from multiprofile researches the combined effect of the physical factors could be standardized.