Additionally, the question whether electromagnetic field affects intracellular calcium concentration should be analyzed.
11 to 28 amphibian embryos per group were investigated in the development range from 2-cell-stage (or later) to the tail bud stage (after five days).
Embryos exposed to the extremely low frequency electromagnetic field showed an accelerated rate of early development compared to control group. This effect of electromagnetic field was magnetic flux density dependent exerted preferentially at the gastrula stage, and the period of gastrulation was shortened.
Electromagnetic field increased the intracellular calcium concentration particularly in the cells isolated from gastrula.
No clear abnormality concerning morphological aspects in gastrulation was observed under the influence of electromagnetic field.
The data indicate that electromagnetic field specifically increased the intracellular calcium concentration of gastrula cells, thereby, accelerating the rate of cell development during gastrulation.