Absence of nonlinear responses in cells and tissues exposed to RF energy at mobile phone frequencies using a doubly resonant cavity

Kowalczuk, Christine, Yarwood, Gemma, Blackwell, Roger, Priestner, Marisa, Sienkiewicz, Zenon, Bouffler, Simon, Ahmed, Iftekhar, Abd-Alhameed, Raed, Excell, Peter S, Hodzic, Vildana, Davis, Christopher, Gammon, Robert and Balzano, Quirino (2010) Absence of nonlinear responses in cells and tissues exposed to RF energy at mobile phone frequencies using a doubly resonant cavity.

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Guidelines for exposure to radiofrequency fields are based largely on thermal effects of these fields. However, controversy remains over the possibility of adverse health effects from exposure to low level fields such as those associated with the use of mobile phones. A plausible mechanism considers the demodulation of amplitude modulated RF fields by biological systems: if this were to operate, they would be exposed to low frequency fields similar to those of biological processes, and therefore with the potential for biological activity. This study performed the experiment originally proposed by Balzano [2002] to test whether biological cells exhibit the nonlinear responses necessary for demodulation. This would be indicated by the generation of a second-harmonic signal upon exposure of the sample to a pure fundamental signal at around 883 MHz. The experiment used a highly sensitive system employing a doubly-resonant cavity. Storage of the high-frequency energy in the highly-resonant cavity with very low noise amplification and the avoidance of any electrode contact with the samples allowed the experiments to approach the ultimate limits of physical sensitivity. Using a wide range of biological materials, the study was not able to demonstrate non-linear conversion of RF energy by biological materials. The results do not support the hypothesis that living cells possess the non-linear properties necessary to rectify or demodulate RF energy. Therefore biological systems do not appear to act as effective radio receivers, at frequencies above a few hundred MHz.

Item Type: Article
Additional Information: Metadata only available from this repository. Copyright © 2010 Wiley-Liss, Inc., A Wiley Company. Details of this article were first published in Bioelectromagnetics Online, Early view in advance of publishing in July 2010.These details are available at http://dx.doi.org/10.1002/bem.20597
Keywords: Bioelectromagnetics, mobile phones, demodulation, interaction mechanisms, non-thermal effects
Divisions: ?? GlyndwrUniversity ??
Depositing User: ULCC Admin
Date Deposited: 05 Oct 2011 09:13
Last Modified: 11 Dec 2017 20:06
URI: http://glyndwr.repository.guildhe.ac.uk/id/eprint/197

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