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To investigate the effects of 50 Hz magnetic fields combined with static magnetic fields on the development of tadpoles.
Former studies have found biological effects of particularly weak AC magnetic fields but with a frequency close to the cyclotron resonance frequency corresponding to the charge-to-mass ratio of a calcium ion and to the applied DC field (for example Zhadin et al. (1999), Lisi et al. (2006), Garardi et al. (2008)).
Two experiments were performed: experiment 1) 50 Hz magnetic field plus static magnetic field of 65 µT (n=68) and a control group without exposure (n=68) and experiment 2) 50 Hz magnetic field without artificial static magnetic field (only geomagnetic field) (n=68) and a control group without exposure (n=68). Both experiments were repeated three times, i.e., in total 408 tadpoles were used per condition.
|ばく露時間||not reported, probably during the whole development|
|チャンバの詳細||aquarium with 0.26 m height, 0.26 m width and 0.40 m length|
|ばく露装置の詳細||solenoid had a length of 1.60 m and a diameter of 0.38 m and was made of 1600 copper wire turns (diameter 0.001 m); static field was obtained by adding a DC component to the AC component of the current generator|
In the first experiment, no significant differences were found between the exposed tadpoles (static magnetic field of 65 µT plus 50 Hz magnetic field) and the control ones. However, in the second experiment, a significant delay regarding the developmental stage was found in exposed tadpoles (geomagnetic field plus 50 Hz magnetic field) compared to those from the control group.
The authors conclude that the geomagnetic field could play an important role in the development of tadpoles when exposed to a 50 Hz magnetic field and further hypothesize a correlation to increased calcium ion energy levels.