Seasonality of pineal melatonin production in the rat: possible synchronization by the geomagnetic field.

@article{Bartsch1994SeasonalityOP,
  title={Seasonality of pineal melatonin production in the rat: possible synchronization by the geomagnetic field.},
  author={Hella Bartsch and Christian Bartsch and Dieter Mecke and Theodor Hermann Lippert},
  journal={Chronobiology international},
  year={1994},
  volume={11 1},
  pages={21-6}
}
Pineal melatonin production was estimated by means of urinary 6-sulfatoxymelatonin (aMT6s) determination in two groups of female rats for 1 year each. Seasonal changes of nocturnal aMT6s excretion were found with peak levels in summer despite constant photoperiods. We hypothesize that the horizontal component H of the geomagnetic field may act as a seasonal zeitgeber because H shows a similar seasonal rhythm, and changes in the direction and intensity of H can affect pineal activity. The… CONTINUE READING
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