Conclusive results of the effect of extremely low frequency magnetic fields (ELF MF) exposure on memory are controversial. The aim of the present study was to investigate and follow up the effect of exposure to 1, 2 and 3 mT ELF MF for 30 min daily for 7 days on mice long-term memory. Passive avoidance task was used, and assessments were carried out one day, one and two weeks after exposure. The results showed that all intensities impaired long-term memory compared to the control after one day and one week. 3mT group was more affected than 1 mT group after one day and more affected than 1 and 2 mT groups after one week. After 2 weeks of exposure, memory was significantly impaired only in 3 mT group in comparison to control and 1 mT groups. We concluded that ELF MF impair long-term memory, this impairment was more significant with the increase of exposure intensity. Memory impairment was temporary along the studied design in all studied exposure intensities.
In many radiation applications, there are clear dose effect relationships. On the other hand, there are many confusions about the radiation dose relationship that comes from depleted uranium on blood. Time study (0-16 hours) of three concentrations of uranyl acetate (1, 2 and 4 mM), which can reflect radiation dose multiplications, is used as depleted uranium on stored human blood. The exposed blood dielectric properties were measured using the three frequencies method at 25, 500 and 1000 KHz; the three doses at the different time intervals were compared. We find that some electric properties are not affected by increasing the dose during the whole time interval. No significant changes in neither the cell interior resistance nor in relative permittivity at 25, 500 and 1000 KHz at all the time interval, thus no dose relationship can be detected from them. The significant changes in plasma resistance, cell membrane capacitance and dielectric loss (at 25, 500 and 1000 KHz) are at only 9 hours of exposure and are dose related while there is no significant change at any other time interval. So we conclude that some electric properties if measured at certain time of exposure can give dose related relationship of depleted uranium on blood.
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