RESULTS AND DISCUSSION Data on the survival of treated eggs are presented in Table 1. The general trend for decreasing survival with increasing age is typical for the late summar season when the study was conducted. A survival of 58.7% was found in a control group of brood that was reared within a nursery colony and never exposed within either chamber. Orthogonal comparisons (conducted following an inverse sign transformation of the data) indicated no significant differences (0.10 level) between [1] microwave and sham treatments at any power density; [2] between exposures conducted within the microwave and sham chambers for all six levels grouped for each chamber; [3] between the combined microwave (3, 6, 9, 25 and 50 mW/cm2) and sham exposures when the five microwave treatment levels were combined; or [4] between the zero level exposures compared with all other exposure levels combined. The consistently lower level of survival in the microwave-treated groups at 10 and 20 days post-treatment may be accounted for as follows. Slightly higher brood mortality was observed in the bottom chamber of nursery colonies throughout the study. This effect should have been distributed equally between brood groups, according to our experimental design, by alternating the placement of treated and sham groups in
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