Hasil untuk "cs.SC"

E. L. Briggs, Wenchang Lu, J. Bernholc

AbstractA multi-order Adaptive Finite Differencing (AFD) method is developed for the kinetic energy operator in real-space, grid-based electronic structure codes. It uses atomic pseudo orbitals produced by the corresponding pseudopotential codes to optimize the standard finite difference (SFD) operators for improved precision. Results are presented for a variety of test systems and Bravais lattice types, including the well-known Δ test for 71 elements in the periodic table, the Mott insulator NiO, and borax decahydrate, which contains covalent, ionic, and hydrogen bonds. The tests show that an 8th-order AFD operator leads to the same average Δ value as that achieved by plane-wave codes and is typically far more accurate and has a much lower computational cost than a 12th-order SFD operator. The scalability of real-space electronic calculations is demonstrated for a 2016-atom NiO cell, for which the computational time decreases nearly linearly when scaled from 18 to 144 CPU-GPU nodes.

Sesegma G. Dorzhieva, Bair G. Bazarov, Alexander A. Bush et al.

Kyoung Ho Lee, Ki-Woong Chae, Chae Il Cheon et al.

EK Dutton, CS Uhm, SJ Samuelsson et al.

We used a novel mammalian coculture system to study ACh receptor (AChR) redistribution and synaptic structure at nerve-muscle contacts. Ventral spinal cord (VSC) neurons were plated on cultures containing extensive myotubes but few fibroblasts. Neurite-induced redistribution of AChRs occurred within 6 hr after plating neurons and was maximal between 36– 48 hr. This AChR redistribution appeared in two patterns: (1) AChR density at sites directly apposed to the neurite where neurites crossed preexisting AChR patches was sharply reduced, (2) Newly aggregated AChRs formed swaths lateral to the neurite path. VSC neurons induced more AChR aggregation than hippocampal, superior cervical ganglion and dorsal root ganglion neurons. The 43 and 58 kDa postsynaptic proteins were colocalized with AChR-enriched domains in all VSC neurite-induced aggregates whereas the colocalization of laminin was variable. Electron microscopy of regions with neurite-induced AChR aggregation showed postsynaptic membrane specializations characteristic of developing synapses and, in older cultures, features of more mature synaptic structure. Thus, the coculture system is useful for studying early stages of neuromuscular junction (NMJ) formation. Neurites in these cocultures were identified as axons or dendrites by morphological criteria and by their immunoreactivity for synaptophysin and phosphorylated heavy neurofilament subunits or for microtubule associated protein 2 (MAP2), respectively. Axons showed a 10-fold higher induction of AChR aggregation than did dendrites. Thus, at least one essential signaling molecule necessary for the induction of AChR aggregation at sites of interaction with muscle appears to be expressed in a polarized fashion in developing VSC neurons.

Wen Li, Billy Cs Leung, James Yw Lau et al.

Editorial Revista Juridica OAB-SC

O editorial da Revista Jurídica da OAB/SC, Volume 4 (2024), destaca a conquista da indexação no EBSCO Host, refletindo a relevância acadêmica da revista. Além disso, todos os artigos publicados são credenciados com DOI, o que assegura maior visibilidade e integridade científica. A edição reúne dez artigos que abordam temas diversos, como a aplicação da inteligência artificial no Direito, os impactos da tokenização de ativos, e o reconhecimento das famílias paralelas no Brasil.

MM Morales, RM Lassance, LF Prota et al.

A. H. Sommer, H. H. Whitaker, B. F. Williams

The Cs content of GaAs(Cs) and GaAs(Cs–O) photocathodes was determined by direct chemical analysis. The surface films were found to be of monolayer dimension. From this result, it is concluded that the effect of these films on electron emission is probably not associated with the bulk properties of cesium oxide.