To study the influence of electromagnetic field exposure on water flea parthenogenetic eggs.
Control and experimental egg samples had strict synchronization and genetic identity.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
45–500 Hz
Exposure duration:
up to 43.70 h
|
|
| Frequency | 45–500 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | up to 43.70 h |
| Exposure source | |
|---|---|
| Setup | pair of horizontal Helmholtz coils with a diameter of 30 cm; dishes with eggs placed in the center of the coils |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 75 µT | - | measured | - | - |
Biological effects occured during exposure to electromagnetic fields with 45, 110, 175, 435 and 500 Hz frequencies. Under exposure with these frequencies parthenogenetic eggs of Daphnia magna have shown accelerated rates of embryonic development (accelerated release from the internal egg membrane), except for 500 Hz. Females that developed from exposed eggs have shown deteriorated production characteristics in their first brood (decrease in number of viable offspring, increase of abortive offspring). Size-weight characteristics of females and number of produced offspring in the second brood did not differ from the controls, except for 175 Hz (where it was significantly lower).
The data showed that developing organisms reacted to electromagnetic exposure during embryogenesis by a modification of some processes but returned to normal physiological condition later.
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