960 research outputs found

    Conceptos biomecánicos de los clavos «en cerrojo»

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    Se pasa revista a las propiedades mecánicas comparativas de los diferentes montajes alcanzables con los distintos modelos y concepciones de clavos «en cerrojo*. Es evidente que la rigidez y resistencia de los clavos macizos y después de los clavos huecos de sección cerrada es superior a los clavos convencionales o de primera generación. Igualmente el bloqueo por tornillos o pernos sobre cortical es mejor que el proporcionado por aletas u otros artilugios a nivel de la esponjosa. No cabe duda que los clavos «en cerrojo)) suponen un gran avance y ventaja en el tratamiento de las fracturas complejas de la extremidad inferior

    Tuning the endocytosis mechanism of Zr-based metal−organic frameworks through linker functionalization

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    A critical bottleneck for the use of metal-organic frameworks (MOFs) as drug delivery systems has been allowing them to reach their intracellular targets without being degraded in the acidic environment of the lysosomes. Cells take up particles by endocytosis through multiple biochemical pathways, and the fate of these particles depends on these routes of entry. Here, we show the effect of functional group incorporation into a series of Zr-based MOFs on their endocytosis mechanisms, allowing us to design an effi-cient drug delivery system. In particular, naphthalene-2,6-dicarboxylic acid and 4,4'-biphenyldicarboxylic acid ligands promote entry through the caveolin-pathway, allowing the particles to avoid lysosomal degradation and be delivered into the cytosol, en-hancing their therapeutic activity when loaded with drugs

    On the design and implementation of flexible software platforms to facilitate the development of advanced graphics applications

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    This thesis presents the design and implementation of a software development platform (ATLAS) which offers some tools and methods to greatly simplify the construction of fairly sophisticated applications. It allows thus programmers to include advanced features in their applications with no or very little extra information and effort. These features include: the splitting of the application in distinct processes that may be distributed over a network; a powerful configuration and scripting language; several tools including an input system to easily construct reasonable interfaces; a flexible journaling mechanism --offering fault-tolerance to crashes of processes or communications--; and other features designed for graphics applications, like a global data identification- --addressing the problem of volatile references and giving support to processes of constraint solving--, and a uniform but flexible view of inputs allowing many different dialogue modes.These can be seen as related or overlapping with CORBA or other systems like Horus or Arjuna, but none of them addresses simultaneously all aspects included in ATLAS; more specifically none of them offers a standardized input model, a configuration and macro language, a journaling mechanism or gives support to processes of constraints solving and parametric design.The contributions of ATLAS are in showing how all these requirements can be addressed together; also in showing means by which this can be attained with little or no performance cost and without imposing on developers the need of mastering all these techniques. Finally, the design of the ATLAS journaling system is to our knowledge original in the simultaneous solution of all of its requirements
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