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Abstract
Chick embryos were exposed in vivo to a 30-Hz magnetic field (MF); the frequency was chosen to produce near-resonance conditions for calcium and sodium ions in the local geomagnetic field. After a 48-hour incubation and exposure to the MF, a morphological analysis of the embryos was performed and they were classified as normal or not normal. The not normals were developed embryos with slight (abnormals) or strong (malformed) abnormalities and non-developed organisms. The results showed that the proportions of normal and not-normal embryos were not modified by the MF. However, significant changes were observed among the not normal embryos: The proportion of abnormals and malformed was decreased, while the non-developed embryos significantly increased. The results support the hypothesis that a resonance-like effect on calcium and/or sodium ions was produced in organisms which already had some developmental defects.