Based on the concepts of composition ring and composition hyperring, in this note we introduce the notion of composition structure for (m,n)-hyperrings and study the connections with composition hyperrings. Moreover we show that particular strong endomorphisms of (m,n)-hyperrings can determine the composition structure of a such (m,n)-hyperrings. Finally, the three isomorphism theorems are pres...

RÉSUMÉ — Composition et structure des réseaux sociaux Les réseaux sociaux représentent une ou plusieurs relation entre des individus, et des informations sur ces individus eux-mêmes. Les réseaux sociaux montrent à la fois la structure du réseau et des informations sur les individus. Des modèles probabilistes peuvent être utilisés pour analyser les interrelations entre les variables structurelle...

Communication between neurons within the brain occurs at chemical synapses and is fundamental for all brain functions. Modulation of the strength of communication is controlled by both presynaptic and postsynaptic mechanisms and is termed synaptic plasticity. One postsynaptic structure postulated to regulate synaptic strength is the postsynaptic density (PSD), a large electron dense protein com...

We introduce composition in the function-behaviour-structure framework for design, as described by John Gero, in order to deal with complexity. We do this by connecting the frameworks for the design of several models, in which one is constrained by the others. The result is a framework for the design of an object that supports modularity. This framework can easily be extended for the design of ...

Department of Cellular & Molecular Medicine, University of Ottawa, 451 Smyth Road, Ottawa, K1H 8M5, Canada, 2 INRA, Institut National de la Recherche Agronomique, UR83 Recherches Avicoles, F-37380, Nouzilly, France, 3 Max-Planck-Institut für Biochemie, Abteilung Proteomics und Signaltransduktion, Am Klopferspitz 18, D-82152 Martinsried, Germany, 4 Minerology and Petrology, University of Granada...

Purified phycobilisomes of Porphyridium cruentum were solubilized in sodium dodecyl sulfate and resolved by sodium dodecyl sulfate-acrylamide gel electrophoresis into nine colored and nine colorless polypeptides. The colored polypeptides accounted for about 84% of the total stainable protein, and the colorless polypeptides accounted for the remaining 16%. Five of the colored polypeptides rangin...

Earlier studies using atomic force microscopy (AFM) demonstrated the presence of fusion pores at the cell plasma membrane in a number of live secretory cells, revealing their morphology and dynamics at nm resolution and in real time. Fusion pores were stable structures at the cell plasma membrane where secretory vesicles dock and fuse to release vesicular contents. In the present study, transmi...