Mapping of central monoamine neurons in the monkey

Zusammenfassung Verteilung und Morphologie von Katecholamin-(KA) 5-Hydroxytryptamin-Neuronen im Affengehirn stimmt mit früheren Befunden über das Rattengehirn gut überein. Die Zahl der KA-Zellkörper in Area Subceorulea ist jedoch bedeutend grösser bei Affen, und eine neue Art terminaler KA-Nervenfasern von starker Fluoreszenzintensität und im Durchmesser variierender Varikosität wurde aufgefunden.     

Zur zellulären Aminosäure-Inkorporation im in- und exkretorischen Pankreas unter experimentellen Bedingungen

Summary After glucagon and tolbutamide administration, the protein synthesis in the nucleus increases, especially in the B- but to a lesser extent also in the A-cells. Similar effects are noted in the cytoplasma of B-cells. Already 2 h following alloxan premedication, there is no activity in the nucleus and cytoplasm of B-cells, whereas in the A-cells they are markedly labelled.     

Use of a zonal rotor for demonstrating that human myelin is formed by a continuum of particles of different densities]

Human myelin isolated from frozen brain consists of a continuum of particles as shown by sucrose continuous gradient (between 0,4 and 0,85 M) on zonal rotor. This was determined by measuring the O. D. at 260 and 280 millimicron, the protein concentration by Lowry method and sucrose concentration by polarimetry in 60 fractions. Most of the material is concentrated between 20-23% sucrose, the maximum being found at 21.5% (0.63 M). The fractions are dialyzed for 62 hrs. to remove the sucrose and the pellet obtained after centrifugation shows that the protein concentration increases from the ligher fraction to the heavier.     

Experimental dissociation between hippocampal theta activity in wakefulness and hippocampal theta activity in paradoxal sleep in the rat]

The effects of electrolytic lesion of the septum on the theta activity of the dorsal hippocampus were studied in the chronically implanted Rat during wakefulness and paradoxical sleep. The experimental results show that depending on its localization, septal lesion can either: (1) eliminate the wakefulness theta rhythm without suppressing that of paradoxical sleep; (2) eliminate the paradoxical sleep theta rhythm without suppressing that of wakefulness. These results suggest that there are two kinds of theta activity having different anatomophysiological bases and a different functional significance: one associated with wakefulness and the other with paradoxical sleep.     

Sex differences in blocking thyroid radioiodine uptake in mice

Zusammenfassung Weibliche und männliche Mäuse unterscheiden sich nach Vorbehandlung mit Schilddrüsenhormonen in der Aufnahme von Jod-131.