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Interaction of low-level microwave radiation with nervous system--a quasi-thermal effect?/Madala nivooga mikrolainekiirguse koosmoju narvisusteemiga--kas kvaasisoojuslik moju?

Hinrikus, Hiie ; Lass, Jaanus ; Tuulik, Viiu

Proceedings of the Estonian Academy of Sciences. Engineering, 2004-06, Vol.10 (2), p.82

Estonian Academy Publishers

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  • Título:
    Interaction of low-level microwave radiation with nervous system--a quasi-thermal effect?/Madala nivooga mikrolainekiirguse koosmoju narvisusteemiga--kas kvaasisoojuslik moju?
  • Autor: Hinrikus, Hiie ; Lass, Jaanus ; Tuulik, Viiu
  • É parte de: Proceedings of the Estonian Academy of Sciences. Engineering, 2004-06, Vol.10 (2), p.82
  • Descrição: This analytical review is focused on the discussion of a possible interaction mechanism of microwave radiation with the nervous system. Energy level of the non-thermal electromagnetic field effects has a lower boundary, limited by the principal physical noise, and an upper boundary, limited by the thermal effects. The thermal energy that introduces disturbances in energy distribution of ions and movement in neurones is about [10.sup.-5] eV. The electrical field of [10.sup.-10] V/cm can introduce an equivalent disturbance of the thermal equilibrium inside a cell of 10 µm radius. If caused by the low-level microwave exposure, this phenomenon may not be associated with an increase in temperature. Fluctuations, initiated by the high-frequency field in the movement of ions and membranes, affect the gating variables and nerve cell properties like the increase in temperature does. The hypothesis that microwave radiation can affect permeability of the membranes of nerve fibres or myelin sheaths was examined experimentally. A 450 MHz microwave field, with and without modulation, polarized perpendicular or parallel to the nerve axon, was applied. The measured field power density at the skin was 0.87 mW/[cm.sup.2]. The left and right nervus medianus motor nerve fibres of two young female subjects were under the study. The results of 20 cycles of measurements show that the low-level microwave field caused statistically significant increase in the nerve pulse propagation velocity in human motor nerve fibre. The increase was detected only for polarization, perpendicular to the nerve fibre. The 100% amplitude modulation decreased this effect. The effect may be related rather to the threshold voltage of the nerve axon than to the myelin sheath. Key words: EMF effects, low-level radiation, thermal effect, nerve axon, nerve pulse conduction velocity, active membrane permeability. Analuutilises ulevaates hinnatakse mikrolainekiirguse ja narvisusteemi voimalikke koosmojumehhanisme. Elektromagnetkiirguse mittesoojusliku moju piirang on altpoolt maaratud fuusikalise muraga ja ulaltpoolt soojusliku mojuga. Soojuslik energia, mis tekitab hairitust ioonide energeetilises jaotuses ja liikumises neuronites, on suurusjargus [10.sup.-5] eV. Seega elektrivali tugevusega [10.sup.-10] V/cm on voimeline tekitama uhesuguse hairituse soojuslikus tasakaalus rakkudes raadiusega 10 µm. Madala nivooga mikrolaine kiirguse poolt tekitatud hairitus ei ole seotud temperatuuri tousuga. Korgsagedusliku valja poolt esile kutsutud fluktuatsioonid ioonide liikumises ja membraanides mojutavad membraanide labitavust ja raku omadusi sarnaselt temperatuuri mojule. Eksperimentaalselt uuriti hupoteesi, et mikrolaine kiirgus mojutab narvikiu omadusi ja nende kaudu narviimpulsi levi kiirust. Kasutati pidevat ja moduleeritud kiirgust sagedusega 450 MHz, polariseeritud kas risti voi piki narvikiudu. Valja voimsustihedus naha pinnal oli 0,87 mW/[cm.sup.2]. Uuriti motoorset narvi kahe noore naise vasakul ja paremal kael. Kahekumne mootetsukli tulemused naitasid, et narvikiule risti polariseeritud vali tingis statistiliselt olulise narviimpulsi levi kiiruse suurenemise. See tulemus kinnitab hupoteesi mikrolainekiirguse kvaasisoojuslikust mojust.
  • Editor: Estonian Academy Publishers
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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