Schirmacher A, Winters S, Fischer S, Goeke J, et al. (2000)
study used an in vitro model of the blood-brain barrier (BBB). This
model, which consisted of rat brain cells growing in a culture with
pig blood vessel cells, was tested using electron microscopy and immunocytochemistry,
and found to reflect vital properties of the BBB. The cultures were
exposed to 1800 MHz microwave radiation pulsed at a repetition rate
of 217 Hz. The overall average SAR was 0.3 W/kg, with a maximum value
of 0.46 W/kg at any point. No significant rise in temperature could
be detected within the measurement resolution of about 0.1° C.
The authors conclude that their experiment showed "a definite and reproducible effect of microwave exposure on the physiological properties of the BBB in vitro".