Paulraj R, Behari J (2002).

Thirty five-day-old rats were exposed for 2 hours/day for 35 days to 2.45 GHz radiation. The SAR was 0.1 W/kg. Nine rats were exposed and nine sham-exposed. After the exposure the rats were sacrificed and their brains examined. Biochemical examinations were done blindly i.e. the researchers were unaware of the exposure status of the animal until after the examination was done.

The exposed animals' brains were significantly different from the sham-exposed in all three assays that were done. Ornithine decarboxylase activity was increased. This is thought to be a n integral step in tumour promotion. Protein kinase, which plays a role in signal transduction for a variety of substances that activate cellular function and proliferation, showed decreased activity. Calcium efflux was significantly increased. Calcium has many important functions in cell metabolism.

The authors conclude that their results "indicate that this type of radiation affects the membrane bound enzymes, which are associated with cell proliferation and differentiation, thereby pointing out its possible role as a tumor promoter".

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