Not who you're replying to, nor an expert in the field, but yeah. This is at most an exploratory experiment that requires replication.
The fact that no rat behavior change was reported until the 3 week mark heavily suggests external factors; hardly a cumulative effect as any long exposure effect would display.
Moreover an interesting paragraph:
> The average rectal temperatures of rat were observed to be 33.71±0.56 (control), 35.3±0.63 (EMR-900 MHz), 35.48±0.67 (EMR-1800 MHz) and 36.96±0.55 (EMR-2450 MHz) before and 33.91±0.82 (control), 35.5±0.51 (EMR-900 MHz), 35.66±0.60 (EMR-1800 MHz) and 37±0.78 (EMR-2450 MHz).
Seems to indicate the 2450 MHz rats were ill or otherwise stressed (rat body temperature hovers around 35.5, though it can increase at night), but no verification or mention is done on this whatsoever. I honestly believe many of effects described in the paper can be explained with the body temperature differential.
Also worth mentioning:
> The animals after being exposed to 900, 1800 and 2450 MHz EMR, the average power density was found to be 0.1227 W/m2. While the overall value of whole body average SAR was found to be approximately, 0.0227, 0.030 and 0.0616 W/kg.
Again not my field but I doubt 120mW/m2 can result in 50% absorption (61.6mW) per kg of rat. That means 2 kg of rats would absorb 100% of the radiation, while obviously not covering a full square meter. Please correct me if I misunderstood something.
I'm not saying that 2.4GHz radiation has no ill effects, there's tons of research on rats since the inception of the microwave, but it generally show changes at higher (and certainly more clear) SAR levels.
The fact that no rat behavior change was reported until the 3 week mark heavily suggests external factors; hardly a cumulative effect as any long exposure effect would display.
Moreover an interesting paragraph:
> The average rectal temperatures of rat were observed to be 33.71±0.56 (control), 35.3±0.63 (EMR-900 MHz), 35.48±0.67 (EMR-1800 MHz) and 36.96±0.55 (EMR-2450 MHz) before and 33.91±0.82 (control), 35.5±0.51 (EMR-900 MHz), 35.66±0.60 (EMR-1800 MHz) and 37±0.78 (EMR-2450 MHz).
Seems to indicate the 2450 MHz rats were ill or otherwise stressed (rat body temperature hovers around 35.5, though it can increase at night), but no verification or mention is done on this whatsoever. I honestly believe many of effects described in the paper can be explained with the body temperature differential.
Also worth mentioning:
> The animals after being exposed to 900, 1800 and 2450 MHz EMR, the average power density was found to be 0.1227 W/m2. While the overall value of whole body average SAR was found to be approximately, 0.0227, 0.030 and 0.0616 W/kg.
Again not my field but I doubt 120mW/m2 can result in 50% absorption (61.6mW) per kg of rat. That means 2 kg of rats would absorb 100% of the radiation, while obviously not covering a full square meter. Please correct me if I misunderstood something.
I'm not saying that 2.4GHz radiation has no ill effects, there's tons of research on rats since the inception of the microwave, but it generally show changes at higher (and certainly more clear) SAR levels.