Ribbon synapses continuously transmit graded membrane potential changes into changes of synaptic vesicle exocytosis and rely on intense synaptic membrane trafficking. The synaptic ribbon is considered central to this process. In the present study we asked whether tonically active ribbon synapses are associated with the generation of certain lipids, specifically the highly active signaling phosp...

Research into the effects of weightlessness on rat vestibular maculae has consistently shown that ribbon synapses in hair cells of the utricular maculae exhibit statistically significant changes in number, kind, and distribution when rats are exposed to space flight (Ross, 1993, 1994, 2000). Synaptic plasticity was most evident when all type II hair cells of these maculae were considered and wa...

The ground state physical properties of Gd 1-x Ce x Ni 5 (x = 0; 0.2; 0.5; 0.8 and 1) melt-spun ribbons were investigated by X-ray diffraction, magnetization specific heat measurements. produced ribbon samples are single phases with the hexagonal CaCu -type crystal structure. magnetic transition temperature decreases increasing content. At a around 100 K for CeNi ribbon, spin fluctuations effec...

This thesis begins with the study of a class of symmetric functions {x} which are generating functions for ribbon tableaux (hereon called ribbon functions), first defined by Lascoux, Leclerc and Thibon. Following work of Fomin and Greene, I introduce a set of operators called ribbon Schur operators on the space of partitions. I develop the theory of ribbon functions using these operators in an ...

PURPOSE Efficient and precise release of glutamate from retinal bipolar cells is ensured by the positioning of L-type Ca(2+) channels close to release sites at the base of the synaptic ribbon. We investigated whether Ca(2+) channels at bipolar cell ribbon synapses are fixed in position or capable of moving in the membrane. METHODS We tracked the movements of individual L-type Ca(2+) channels ...

PURPOSE Synaptic ribbons are organelles found at presynaptic active zones of sensory neurons that generate sustained graded electrical signals in response to stimuli, including retinal photoreceptor cells and bipolar neurons. RIBEYE is the major and specific protein constituent of ribbons; however, over the past decade an increasing number of other proteins have been identified at ribbon active...

the miocene pyroxene andesite lava flows are exposed in southeastern edge of urumieh dokhtar magmatic assemblage in iran. the hypocrystalline andesite in parts contain conspicuous co-magmatic igneous enclaves which are dark grey and occur mostly as spherical and occasionally as ribbon shapes with some showing chilled margins. petrographic study shows that the ribbon type enclaves have been form...

Width-controlled M-type hexagonal SrFe12O19 nanoribbons were synthesized for the first time via polyvinylpyrrolidone (PVP) sol assisted electrospinning followed by heat treatment in air, and their chemical composition, microstructure and magnetic performance were investigated. Results demonstrated that as-obtained SrFe12O19 nanoribbons were well-crystallized with high purity. Each nanoribbon wa...