By National Council on Radiation Protection and Measurements
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5 h, the sample was cooled to room temperature for assaying. There was less than a 1-"C difference between conventionally and microwave-heated samples. 1). Gel electrophoresis also showed no differences. 7 and 2450 MHz and that relaxation of bound water 19 / 3. MACROMOLECULAR AND CELLULAR EFFECTS Fig. 1. Difference spectra under RFEM irradiation. Each of the 2 figures illustrates the actual scans of the three curves: unirradiated us unirradiated (control), after start of irradiation us unirradiated, after 30 min of irradiation us unirradiated.
Electrical and biological shielding and shadowing 10. , heat, humidity, light, and air velocity) 11. Physiological and psychological status of subjects (anesthesia, restraint, handling, nutritional state, feeding and watering schedule) 12. ) 13. 7 SUMMARY AND CONCLUSIONS / 39 There is ample evidence of thermal effects of RFEM fields a t high power densities. However, until more data are obtained from carefully controlled and executed experiments, definitive conclusions on the cellular effects of microwaves at low power densities will have to wait.
Chen and Lin (1978) exposed Chinese hamster somatic cells (V-79) to 2450-MHz CW at a power density of 500 mW/cm2 (SAR, 1059 W/kg). 1 "C in a constant-temperature circulator within a waveguide exposure system. A 100-pl pipet held the suspension. Another suspension was sham-exposed under the same conditions. 14). They observed vacuoles that increased in volume and in irregularity during continued growth. Later, starshaped, giant ruffle cells were formed. 15. These changes appeared to be irreversible.