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We report a highly diastereo- and enantioselective allylation of azlactones catalyzed by the combination of a metallacyclic iridium complex and an optically inactive phosphate anion. The process demonstrates an approach for conducting diastereoselective reactions with prochiral nucleophiles in the presence of metallacyclic allyliridium complexes. The reaction provides access to an array of enantioenriched allylated azlactones containing adjacent tertiary and quaternary carbon centers. Preliminary mechanistic studies suggest that the phosphate and methyl carbonate anions together induce the unusually high diastereoselectivity.
Health systems that standardize their EHRs and that own and manage hospitals and medical groups have higher rates of advanced HIT adoption and use. System leaders looking to increase the use of advanced HIT capabilities should consider ways to better standardize their EHRs across organizations.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Este articulo responde a la edicion especial de Qualitative Sociology (V. 20; N° 3; verano del 2005) dedicado al libro Body and Soul: Notebooks of an Apprentice Boxer [Entre las cuerdas. Cuadernos de un 1 aprendiz de boxeador]. Cuatro temas son tratados: el posicionamiento del investigador y la cuestion de la aceptacion social y de la pertenencia; la dinamica de la corporizacion y el rol variable de la raza como una propiedad estructural, interactiva y dispocisional; el funcionamiento del gimnasio donde se practica boxeo como una maquina civilizadora y masculinizadora en miniatura, junto con el enigma de las “mujeres ausentes”; y, finalmente, el aprendizaje como un modo de transmision de conocimiento y tecnica para la investigacion social, el area de la sociologia carnal, y el trabajo textual necesario para transmitir la textura multicolor y el encanto del mundo social. Esto nos lleva a clarificar la constitucion empirica, retorica y conceptual de Entre las cuerdas... en relacion a su triple intento de elucidar los trabajos de una competencia sociocultural que reside en las capacidades pre-discursivas; el desplegar y desarrollar el concepto de habitus como una filosofia operativa de la accion y guia metodologica; y ofrecer un informe, no para la sociologia del cuerpo (como un producto social e inteligible) sino para una sociologia desde el cuerpo (como florecimiento social y vector de conocimiento), ejemplificando una manera distintiva de hacer y escribir etnografia, que reconoce y toma una gran ventaja epistemica de la naturaleza visceral de la vida social.
The interest in imaging materials with improved environmental characteristics has led us to consider imaging formulations coated from and developed in aqueous media, thus avoiding the need for both organic solvents and basic aqueous developer solutions. We have previously reported on the design of several negative-tone resists operating via radiation-induced crosslinking, and while the performance of these negative-tone systems met our basic goals, the resolution that could be achieved was limited due to swelling occurring during development. We now report on various other designs based on polyoxazoline, poly(vinyl alcohol), and methacrylate resins that circumvent this problem with approaches towards both negative- and positive- tone systems.
The local activity theory [Chua, 97] offers a constructive analytical tool for predicting whether a nonlinear system composed of coupled cells, such as reaction-diffusion and lattice dynamical systems, can exhibit complexity. The fundamental result of the local activity theory asserts that a system cannot exhibit emergence and complexity unless its cells are locally active. This paper gives the first in-depth application of this new theory to a specific Cellular Nonlinear Network (CNN) with cells described by the FitzHugh–Nagumo Equation. Explicit inequalities which define uniquely the local activity parameter domain for the FitzHugh–Nagumo Equation are presented. It is shown that when the cell parameters are chosen within a subset of the local activity parameter domain, where at least one of the equilibrium state of the decoupled cells is stable, the probability of the emergence of complex nonhomogenous static as well as dynamic patterns is greatly enhanced regardless of the coupling parameters. This precisely-defined parameter domain is called the "edge of chaos", a terminology previously used loosely in the literature to define a related but much more ambiguous concept. Numerical simulations of the CNN dynamics corresponding to a large variety of cell parameters chosen on, or nearby, the "edge of chaos" confirmed the existence of a wide spectrum of complex behaviors, many of them with computational potentials in image processing and other applications. Several examples are presented to demonstrate the potential of the local activity theory as a novel tool in nonlinear dynamics not only from the perspective of understanding the genesis and emergence of complexity, but also as an efficient tool for choosing cell parameters in such a way that the resulting CNN is endowed with a brain-like information processing capability.
Achirale Polysiloxane mit para ‐Alkoxybenzoesäure‐Seitengruppen können über Wasserstoffbrückenbindungen viele Moleküle eines optisch aktiven trans ‐Stilbazols binden. Das durch Selbstorganisation resultierende System 1 zeigt ferroelektrische Eigenschaften, die sich über die Zahl der Stilbazoleinheiten pro Polymermolekül und die Länge der (CH 2 ) n ‐Spacer steuern lassen. magnified image
