Freeze-fracture replicas demonstrate that the apical membrane of the chloride cells of young adult lampreys (Geotria australis) undergoes a structural change when the animal is acclimated from freshwater to seawater. Although the particles on both the P face and the E face of this membrane are randomly distributed in freshwater animals, they are usually… (More)
Connexins constitute the channel-forming proteins of gap junctions. Gap junctions are considered to be involved in the regulation of cell proliferation. To verify this hypothesis for connexin43, the most abundant connexin in brain tissue, we have analyzed the expression of this gap junction protein in the subependymal layer and the rostral migratory stream… (More)
Short-term treatment of the endothelium with dihydropyridine calcium antagonists resulted in an increased release in NO that is not due to a modulation of L-type calcium channels, because macrovascular endothelial cells do not express this channel. We investigated whether long-term (48 hours) treatment of porcine endothelial cell cultures with the… (More)
The Crystal Ball detector at the Doris II storage ring at DESY has been used to study the electron energy spectrum of the decay r + euF. In the Standard Model, the Lorentz structure of the decay matrix element is of the well-known V-A type, resulting in a Michel parameter of p = 0.75. Our spectrum is found to be consistent with this value.
Scanning electron microscopy (SEM) was used to study the changes that occur in the morphological relationships between chloride and pavement cells in the gills during acclimation of young adult lampreys to seawater. Because chloride cells are located predominantly between lamellae and are thus obscured from view, the lamellae were removed with the use of a… (More)
The intramembrane organization of the sarcolemma at the sites of myotendinous and myomuscular junctions was studied in the gill sac-muscle of the Atlantic hagfish, Myxine glutinosa, by using freeze-fracture replicas. At these sites rows of irregularly shaped particles (diameter approximately 6 nm) and short fibrils are present on the P face and a… (More)