Research On Electric Properties Of Biological Tissues And Their Changes After Exposure To Electromagnetic Field

Electromagnetic pollution becoming increasingly severe today, it attracts theattention of many health agencies. How to determine the effect of existenceelectromagnetic radiation in environment on human health is one of the major issuesstudied by many scholars. Occurrence and development of the biological effects ofelectromagnetic fields is closely related to the characteristics of the electromagneticfield itself, as well as the electromagnetic properties of biological tissues. The mainwork of this thesis is summarized as the following:First, electrical properties of15living tissues of rats are measured by HP4275AMulti Frequency LCR Meter between10kHz-10MHz, and the value of εr10k/εr10Misused to evaluate the water content of different tissues. Electric properties of rat blood,testis and brain are measured during in vitro within half an hour. Results of thesemeasurements are analyzed to study the reasons of the electrical properties in differenttissues. The results show that different tissues showing very different electricalproperties, high conductivity denotes high water content of tissues, so value ofεr10k/εr10Mis larger in these tissues. Electrical properties of electromagnetic sensitivetissues in rat change with time in vitro. Dielectric constant of those tissues basicallyshow same trend in different frequency bands, with the increase of time in vitro, therelative permittivity become smaller. Conductivity of those tissues in differentfrequency basically shows the same characteristic that is most of them decreased withtime in vitro.Second, coupling results of electromagnetic field in body are calculated byelectrical properties of the measurements. Occurrence regularity of thermal effectsunder different frequency of different frequency electromagnetic radiation is alsocalculated.Third, characteristics of the interaction of biological tissues and electromagneticfield are studied by changes of the electrical properties in sensitive tissues of the ratexposure to electromagnetic field. Especially the electrical properties of the sensitive tissue in rat after exposure to static magnetic fields, extremely low frequencyelectromagnetic fields and infrared field are measured. The experimental results showthat exposure of electromagnetic field for a certain time can produce certain changes inthe electrical properties of the sensitive tissue in rats. Exposure of electromagneticfield can cause significant difference between experimental group and control group atsome frequency points. Possible mechanisms of electromagnetic fields effect onbiological tissue are analyzed via electromagnetic field theory and the changes ofelectrical properties in rat tissue.Fourth, Fourier transform infrared spectroscopy (FTIR) analysis method is used toanalyze the biological effect of static magnetic fields, extremely low frequencyelectromagnetic fields and infrared radiation. Infrared spectral characteristics of thesensitive tissues of rat blood, brain and testis are studied to analysis effects of varioustypes of electromagnetic field exposure on blood, nerve, reproductive system. Than,the peak position, peak shape and the second derivative spectra of the biological tissuesare also studied between experimental and control groups to clear whetherelectromagnetic radiation could cause damage and the proper mechanisms.Fifth, effects of infrared field exposure to the disease rats are studied. Effects ofexposure of infrared field on hyperglycemic rats are examined by analyzing theirelectrical properties and infrared spectral characteristics. Testing results of electricalproperties and infrared spectral properties show that the infrared field exposurecontributes to promoting the hyperglycemic rats close to normal rats. The studyconcluded that the infrared field exposure would help the recovery of hyperglycemicrats.