Ein einfaches Verfahren zur Anzucht von Farnprothallien

Ohne ZusammenfassungMit 1 AbbildungFrau Prof. Dr.E. Schiemann zum 80. Geburtstag gewidmet.     

Untersuchungen zum circadianen Sekretionszyklus der neurosekretorischen Kerngebiete der Maus*

Abstract Investigations on the circadian cycle of secretion in the neurosecretory nuclei of mouse. The circadian cycle of secretion of both hypothalamic neurosecretory nuclei N. supraopticus and N. paraventricularis in mice was studied by histological, histochemical, biochemical and electron-microscopical methods. Both areas undergo a circadian secretion cycle (24 h-rhytm). The activity of metabolism increases at the beginning of night, whereas by day the cells are considered to be in a phase of restitution and transportation of the secretion. Especially increases the volume of the cell nuclei (synthesis of RNA and proteins) and the activity of the extralysosomal unspecific esterase rises to maximal values. From midnight till the beginning of the light-phase the cells show a maximal volume of the nuclei and an increased secretion as well as higher activity of acid phosphatase and lactate dehydrogenase. Unspecific esterase activity, on the other hand, diminished. There was a noticable increase in the quantity of neurosecretion in both areas, it reached a maximum at the beginning of the light-phase, whereas the volume of the nuclei and the activity of acid phosphatase and thiamine pyrophosphatase diminished. The neurosecretion is more and more transported to the hypophysis. The cells restitute during the light-phase and reach their starting level.