Desta, A. B., Owen RD, Cress LW (2003):

The authors' aim was to replicate a study by Penafiel and colleagues (1997) that reported a 40% enhancement in ornithine decarboxylase (ODC) activity in murine L929 fibroblast cells after an 8-hour exposure to a digital wireless signal. The authors used the same methodology as Penafiel, even though in some instances they would have preferred a different approach. The senior author, Desta, had been a co-author in Penafiel's study.

The fibroblast cells were exposed to a RF signal from a TDMA phone operating at a frequency of 835 MHz. The exposure was for 8 hours, and at power levels at 0.25, 0.50, 0.75, 1.00, 1.50, 2.00, 2.50, 3.00 mW. These power levels meant that the SARs and temperature increases varied from experiment to experiment. An SAR of < 1 W/kg resulted in no detectable rise in temperature. At non-thermal SAR, there was no statistically significant difference in the mean ODC activities. A trend towards suppression of the mean ODC activity was observed with increasing SAR. This decrease in ODC activity was shown to occur with heating that occurred without RF radiation in a separate experiment. The decrease in ODC activity was statistically significant at SAR levels >5 W/kg.

Thus, the authors observe only the well-known ODC inhibition due to heating, rather than the previously reported enhancement attributed to RF-radiation exposure.

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