Influence of light and darkness on the hypothalamo-hypophysial system of Rana temporaria L.
Zeitschrift für Zellforschung und Mikroskopische Anatomie, ISSN: 0302-766X, Vol: 113, Issue: 2, Page: 174-187
1971
- 9Citations
- 1Captures
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Metrics Details
- Citations9
- Citation Indexes9
- CrossRef9
- Captures1
- Readers1
Article Description
The influence of a long daily photoperiod and continuous darkness was studied on the hypothalamo-hypophysial system of Rana temporaria. After six weeks of treatment (December-January 1968/1969) the secretory activity of the hypothalamo-hypophysial system of the light-treated animals was enhanced. The amount of aldehyde-fuchsin positive material in the preoptic nucleus increased as a result of the light treatment, and decreased in the median eminence, whereas in the posterior lobe no difference could be observed between the light- and dark-treated animals. The karyometric results showed an increase of the nuclear volume of the cells of the preoptic nucleus after light treatment; small differences were noticed between distinct areas of the preoptic nucleus. Autoradiographic data especially showed that light influenced the hypothalamo-hypophysial system to a high degree. Half an hour after the injection of S-cysteine, the incorporation of the isotope in the preoptic nucleus of the light-treated animals was five times as much as in the dark-treated animals. In the median eminence and in the posterior lobe, the autoradiographic results confirmed the results found with regard to the amount of aldehyde-fuchsin positive material. Labelled material is released only from the median eminence and not from the posterior lobe. © 1971 Springer-Verlag.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0014986391&origin=inward; http://dx.doi.org/10.1007/bf00339414; http://www.ncbi.nlm.nih.gov/pubmed/5540538; http://link.springer.com/10.1007/BF00339414; http://www.springerlink.com/index/pdf/10.1007/BF00339414; http://www.springerlink.com/index/10.1007/BF00339414; https://dx.doi.org/10.1007/bf00339414; https://link.springer.com/article/10.1007/BF00339414
Springer Nature
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