RESUMO
Globular molecules of 1-chloroadamantane form a plastic phase in which the molecules rotate in a restrained way, but with their centers of mass forming a crystalline ordered lattice. Plastic phases can be regarded as test cases for the study of disordered phases since, contrary to what happens in the liquid phase, there is a lack of stochastic translational degrees of freedom. When the temperature is increased, a hump in the specific heat curve is observed indicating a change in the energetic footprint of the dynamics of the molecules. This change takes place without a change in the symmetry of the crystalline lattice, i.e. no first-order transition is observed between temperatures below and above the calorimetric hump. This implies that subtle changes in the dynamics of the disordered plastic phase concerning purely orientational degrees of freedom should appear at the thermodynamic anomaly. Accordingly, we describe, for the first time, the microscopic mechanisms behind a disorder-disorder transition through the analysis of neutron diffraction and QENS experiments. The results evince a change in the molecular rotational dynamics accompanied by a continuous change in density.
RESUMO
En este estudio presentamos todos los resultados derivados del procesamiento de los datos del registro de los pacientes de diálisis peritoneal que iniciaron tratamiento sustitutivo en Andalucía entre enero de 1999 y diciembre de 2008. Toda la información procede del Sistema de Información de la Coordinación Autonómica de Trasplante de Andalucía (SICATA). Se presentan datos demográficos, distribución por provincias, las causas de insuficiencia renal y motivo de elección de la diálisis peritoneal como técnica de tratamiento renal sustitutivo, la situación con respecto al trasplante, datos en relación con el catéter y técnica de diálisis peritoneal, las salidas del programa y sus causas, las peritonitis del año 2008, su evolución y resultado de los cultivos. Presentamos también en el informe datos evolutivos 1999-2008 en cuanto a inclusiones, diabetes, tratamiento con diálisis peritoneal automática e incidencia de peritonitis. Analizamos, por otra parte, la supervivencia global de los pacientes y de la técnica diálisis peritoneal, la comorbilidad al inicio del tratamiento y su impacto en la supervivencia (AU)
In this study we show the results derived from the processing of the data of the Registry of the patients on peritoneal dialysis that initiated renal replacement therapy in Andalucía between January of 1999 and December of2008. All the information comes from the base of the Registry of Renal Patients of the Andalucia´s Health Service. The results show demographic data, distribution by provinces, etiology of the end stage renal disease, reason for election of the peritoneal dialysis, inclusion or not in list of renal transplant, catheter data, with draws and their causes, and peritonitis data of 2008. We also analyze in the report, from 1999-2008: anual incidence, diabetes, automatic peritoneal dialysis and peritonitis incidence. Finally we have studied patient and technique survival and factors affecting mortality on peritoneal dialysis, the initial comorbid conditions and its impact in the patient´s survival (AU)
