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Drosophila melanogaster larvae were exposed to a 1 kHz square wave at 8.2 - 12.4 GHz at a calculated SAR of 9.8 mW/kg for 3-6 hrs, including one exposure group with a 30 minute rest separating 2x 3 hr exposures. Exposures were performed using a horn antenna. The authors report no effect of exposure on percent of larva to pupa transition, but did report a longer average pupation time for those larva transitioning to pupa at 36 hrs after exposure. This delay in pupation was more pronounced with longer exposure times. This delay was not observed, however, at 60, 80, or 96 hours post exposure (the effect was transient). The authors also observed a significantly lower number of offspring in the 3 hr, 4 hr, and 3hr - 30 min rest - 3 hr exposure groups (but not the 5 hr exposure group). Calculated heat increases were determined to be too small for effects to be thermal in nature. The authors speculate that a stress - heat shock response may be involved. |