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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Water deprivation and circadian changes in plasma arginine vasotocin and mesotocin in the domestic hen (Gallus domesticus).

Possible circadian variations in plasma levels of arginine vasotocin (AVT) and mesotocin (MT) were assessed in domestic hens (Gallus domesticus) under a 12h:12h light-dark (LD) schedule. Blood samples were taken at 4h intervals, and neurohypophyseal hormone levels were determined by radioimmunoassay. Marked circadian changes in both AVT and MT were observed in hens provided free access to water. Minimal and maximal AVT levels occurred at 08:00 and 20:00, respectively. Minimal MT levels occurred at 20:00, whereas maximal MT levels occurred over a broad time period of 04:00 to 12:00. In water-deprived hens, plasma AVT levels were elevated at each time point, and the circadian variations in plasma AVT and MT levels were attenuated. These results demonstrate that rhythmicity in neurohypophyseal function in a lower vertebrate species, like that in mammals, is disrupted by osmotic stress.[1]

References

  1. Water deprivation and circadian changes in plasma arginine vasotocin and mesotocin in the domestic hen (Gallus domesticus). Chaturvedi, C.M., Chowdhury, A., Cornet, L.E. Chronobiol. Int. (2001) [Pubmed]
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