Study suggests microwaves produce non-thermal effects.
A study by de Pomerai and his colleagues in Nature suggests that prolonged exposure to low-intensity microwave fields may produce biological effects that are non-thermal. The authors found that the microwave fields induced heat-shock responses in the soil nematode Caenorhabditis elegans, and present evidence that these responses are non-thermal. They suggest that "because of the universality of the heat-shock response, a similar non-thermal induction might also occur in human tissues exposed to microwaves, a possibility that needs investigation".
Reference: de Pomerai D, Daniells C, David H, Allan J, et al. Non-thermal heat-shock response to microwaves. Nature 2000;405:417-418.
In November 1999 "What's New Archives" a study was reviewed that examined the effects of RF exposures simulating digital phones on the development of brain tumours in rats. A non-significant trend towards increased survival was seen in the rats exposed to RF fields.
The same authors - Adey et al. - now report a study in which the RF exposure was similar to that seen in analogue phones. No effects were found to be associated with lifetime exposure of the rats to frequency-modulated microwave fields.
Reference: Adey WR, Byus CV, Cain CD, Higgins J, et al. Spontaneous and nitrosourea-induced primary tumors of the central nervous system in Fischer 344 rats exposed to frequency-modulated microwave fields. Cancer Research 2000;60:1857-1863.
Reference: Krause CM, Sillanmaki L, Koivisto M, Haggquist A, et al. Effects of electromagnetic field emitted by cellular phones on the EEG during a memory task. Neuroreport 2000;11:761-764.