Over five hundred and forty of seacucumbers eollected on the southern coasts of Tasmania have in the course of the present study. Seven families, 12 and 14 species are represented in the One is regarded are as new, adhaerens, TaVUtll. and Paraca.udina. Three other species have not been recorded previously from Tasmania but are known from the coast of Victoria. They are Cllcurnella Jnutans incon...

The behaviour of primary cultures of dissociated embryonic chick pigmented retina epithelial (PRE) cells has been investigated. Isolated PRE cells have a mean speed of locomotion of 7-16 mum/h. Collisions between the cells normally result in the development of stable contacts between the cells involved. This leads to a gradual reduction in the number of isolated cells and an increase in the num...

THE heart muscle was conceptualized as an anatomical syncytium for many years (Heidenhain, 1901; Godlewsky, 1902). With the development of electron microscopy, it was proved that cardiac fibers are composed of isolated cells separated by specialized zones—the so-called intercalated discs (Sjostrand and Andersson, 1954). The discs comprise three junctional specializations: (1) the macula adhaere...

The spatial relationships between the protein constituents to two junctional structures, adhaerens junctions and desmosomes, were determined by double immunofluorescence microscopy using marker proteins specific for these structures. Adhaerens junctions were visualized by immunofluorescent labeling for the membrane-associated protein vinculin and by their association with actin filaments. Desmo...

The enigmatic animal phylum Placozoa holds a key position in the metazoan Tree of Life. A simple bauplan makes it appear to be the most basal metazoan known and genetic evidence also points to a position close to the last common metazoan ancestor. Trichoplax adhaerens is the only formally described species in the phylum to date, making the Placozoa the only monotypic phylum in the animal kingdo...

Protein O-GlcNAcylation is a reversible post-translational signaling modification of nucleocytoplasmic proteins that is essential for embryonic development in bilateria. In a search for a reductionist model to study O-GlcNAc signaling, we discovered the presence of functional O-GlcNAc transferase (OGT), O-GlcNAcase (OGA), and nucleocytoplasmic protein O-GlcNAcylation in the most basal extant an...