Wirkung des Mondlichtes auf die Nachtaktivität von Zugvögeln. — Lotsenversuch an Rotkehlchen (Erithacus rubecula) und Gartenrotschwänzen (Phoenicurus phoenicurus)

Summary 8 Robins (Erithacus rubecula) and 3 Redstarts (Phoenicurus phoenicurus) were maintained in registration cages in autumn 1965. Locomotor activity was registered continuously under natural light conditions, temperature remaining fairly constant. All but one bird developed nocturnal restlessness (Zugunruhe) at least during the migratory season (Figure 1). 8 out of 10 birds showed a higher mean activity at night during full moon phases than during new moon phases; 2 birds showed roughly equal activity during both phases of the cycle (Figure 2). Since the measurements of nocturnal activity at least partially correspond to migratory motivation, it is reasonable to assume that free-living individuals of the species investigated are more active during nights in the full moon phase and possibly fly farther than at dark nights.     

Cytologie fine des cellules interstitielles du testicule du poissonLebistes reticulatus R.

Summary The active interstitial cells of the testis ofLebistes reticulatus R. have numerous, big, dense mitochondria of tubular structure and a developed endoplasmic reticulum. The formation of lipochrome pigment granules corresponds to a degenerative evolution of these cells.     

The interpretation of genetical data

Zusammenfassung Für die Interpretation genetischer Ergebnisse wird den Autoren vorgeschlagen, Grundannahmen jeweils ausführlich zu formulieren.     

Licht- und elektronenmikroskopische Befunde an den Geschmacksknospen der Axolotlzunge

Summary The investigation of the taste buds in the tongue of the neotene Mexican axolotl (Siredon mexicanum) by light and electron microscopy demonstrates 4 different cell types: 1) R-cells, marginal cells of less differentiated character. 2) G-cells, granulated cells in basal position. 3) Cells of type A with fibrills, vesicular elements, and dark bodies, showing supporting and secretory function. 4) Cells of type B with an agranular endoplasmic reticulum in stripe like arrangement, supposed to be receptor cells.     

Rocket UV flash spectra from the solar eclipse of March 7, 1970

Flash spectra of the total solar eclipse throughout all its phases have been obtained in the extreme ultraviolet for the first time.     

Effect of prostaglandin F2α on the secretion of pancreatic juice induced by secretin and by dopamine

Zusammenfassung Die Wirksamkeit von Prostaglandin F₂ (PGF₂) auf die exokrine Pankreassekretion wurde an einem mit Blut perfundiereten Pankreas-Präparat des Hundes untersucht. PGF₂ (100 g) hemmte die durch Sekretin stimuliete, aber nicht die durch Dopamin stimulierte Sekretion.