Blackman C F, House D E, Benane S G, Joines W T, Spiegel R J
Health Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711.
Bioelectromagnetics. 1988;9(2):129-40. doi: 10.1002/bem.2250090204.
Fertilized eggs of Gallus domesticus were exposed continuously during their 21-day incubation period to either 50- or 60-Hz sinusoidal electric fields at an average intensity of 10 Vrms/m. The exposure apparatus was housed in an environmental room maintained at 37 degrees C and 55-60% relative humidity (RH). Within 1.5 days after hatching, the chickens were removed from the apparatus and tested. The test consisted of examining the effect of 50- or 60-Hz electromagnetic fields at 15.9 Vrms/m and 73 nTrms (in a local geomagnetic field of 38 microT, 85 degrees N) on efflux of calcium ions from the chicken brain. For eggs exposed to 60-Hz electric fields during incubation, the chicken brains demonstrated a significant response to 50-Hz fields but not to 60-Hz fields, in agreement with the results from commercially incubated eggs [Blackman et al., 1985a]. In contrast, the brains from chicks exposed during incubation to 50-Hz fields were not affected by either 50- or 60-Hz fields. These results demonstrate that exposure of a developing organism to ambient power-line-frequency electric fields at levels typically found inside buildings can alter the response of brain tissue to field-induced calcium-ion efflux. The physiological significance of this finding has yet to be established.
将家鸡的受精卵在其21天的孵化期内持续暴露于平均强度为10 Vrms/m的50赫兹或60赫兹正弦电场中。暴露装置放置在一个环境舱内，该环境舱保持在37摄氏度和55%-60%的相对湿度（RH）。孵化后1.5天内，将鸡从装置中取出并进行测试。测试包括检查在15.9 Vrms/m和73 nTrms（在北纬85度、38微特斯拉的当地地磁场中）的50赫兹或60赫兹电磁场对鸡脑钙离子外流的影响。对于孵化期间暴露于60赫兹电场的鸡蛋，鸡脑对50赫兹场表现出显著反应，但对60赫兹场没有反应，这与商业孵化鸡蛋的结果一致[布莱克曼等人，1985a]。相比之下，孵化期间暴露于50赫兹场的小鸡的大脑对50赫兹或60赫兹场均无反应。这些结果表明，发育中的生物体暴露于建筑物内通常存在的环境输电线频率电场水平下，可改变脑组织对场诱导钙离子外流的反应。这一发现的生理意义尚待确定。
