Repeated in vivo observations were used to study regenerated nerve terminals in neuromuscular junctions of the adult frog Rana pipiens. Sartorius junctions in living animals were stained with the fluorescent vital dye RH414 and viewed with video fluorescence microscopy. Each junction was observed in the intact muscle and then again 7, 10, and 13 weeks after nerve crush. At 13 weeks, junctions w...

The distribution of intercellular junctions, other than synapses and their precursors, has been described in the developing spinal cord of Xenopus laevis between the neurula and free swimming tadpole stages. At the neurocoel, ventricular cells are joined in the apical contact zone by a sequence of junctions which usually has one or more intermediate junctions but often also includes close appos...

The ability of estradiol benzoate (E2 B) and diethylstilbestrol (DES) to affect the formation and internalization of gap junctions was examined in several uterine cell types from hypophysectomized rats. Both myometrial and serosal cells respond to daily administration of E2 B or DES by increasing gap junction membrane in a dose-dependent fashion. The myometrial cell response arises from a zero ...

In this study human myometrial tissues were examined for the presence of gap junctions by quantitative electron microscopy before and after incubation in tissue culture media with and without indomethacin. The area of gap junctions was very low in tissues from pregnant women at term but not labor, before incubation. After 24 and 48 h incubation without any treatment, segments of some of the sam...

The disappearance and reappearance of rat liver gap junctions with respect to the time elapsed after partial hepatectomy and the location in the liver acinar zones were analysed immunohistochemically and morphometrically using an affinity purified antibody against the rat liver gap junction protein. The specificity of antibody was assessed by comparing the immunofluorescent staining patterns of...

In This Issue In This Issue Conjunctions of junctions ike tight junctions in vertebrates, the ladder-like septate junctions found in most invertebrates act as barriers to epithelial permeability. A pair of papers L The ␣ subunit of a pump (the Na ϩ /K ϩ ATPase) is found at the barrier-forming septate junctions in flies. esides allowing ions to flow between adjacent cells, gap junctions selectiv...

In This Issue In This Issue Conjunctions of junctions ike tight junctions in vertebrates, the ladder-like septate junctions found in most invertebrates act as barriers to epithelial permeability. A pair of papers L The ␣ subunit of a pump (the Na ϩ /K ϩ ATPase) is found at the barrier-forming septate junctions in flies. esides allowing ions to flow between adjacent cells, gap junctions selectiv...

Magnetic tunnel junctions hold the key to more accurate and reliable devices.

Carbon nanotubes are molecules entirely made of carbon atoms. Owing to their special shape, they are extremely stiff but also very flexible. The electronic properties are determined by the exact symmetry of the nanotube lattice, resulting in either metallic or semiconducting behavior. Due to their small diameter, electronic motion is directed in the length direction of the nanotube, making them...

Line drawing vectorization is a daily task in graphic design, computer animation, and engineering, necessary to convert raster images set of curves for editing geometry processing. Despite recent progress the area, automatic tools often produce spurious branches or incorrect connectivity around curve junctions; smooth out sharp corners. These issues detract from use such tools, both an aestheti...