37,134 research outputs found
57Fe Mossbauer and electron spectroscopy study on a new synthetic hercyniye-based pigment
No full textA new blue hercynite-based pigment, stable at the processing temperatures for the ceramic application, has been synthesized. It is constituted by corundum and Ti-bearing hercynite. In order to clarify the complex Fe distribution evidenced by Baldi et al. [Proc. CIMTEC 2002(2003)], a 57Fe Mössbauer and diffuse reflectance spectroscopy study has been undertaken. Fe was found to be distributed between corundum, as trivalent, and hercynite, both as Fe(II) and Fe(III). Moreover, Fe(II) occupies both tetrahedral and octahedral sites in the latter mineral, according to a temperature dependent disorder. UV-VIS investigation revealed the presence of a broad band in the blue region, the shape and position of which was found to be due to an intervalence charge transfer mechanism between Fe(II) and Ti(IV) in two edge-sharing octahedra of hercynite. © 2003 Elsevier Ltd. All rights reserved
Adjuvant electrochemotherapy for the treatment of incompletely resected canine mast cell tumors
No full textBackground: Electrochemotherapy (ECT) is a novel anticancer therapy that combines the delivery of trains of appropriate waveforms with the local administration of chemotherapy agents. The purpose of this investigation was to assess the adjuvant potentials of ECT for the treatment of incompletely excised mast cell tumors (MCT). Materials and Methods: Twenty-eight privately-owned dogs with incompletely removed MCT were treated with intralesional bleomycin (1.5 IU/cm2) followed by the application of trains of biphasic pulses (8 pulses, 1300 V/cm, 50 + 50 μs duration, 1 Hz frequency). Results: The overall response rate was 85% with a mean estimated time to recurrence of 52.76±6.5 months (range: 39.99 to 65.54 months, 95% CI). At the time of writing this report, the median survival time was not reached. Three dogs died of metastatic disease that they developed at the same time of local recurrence, one developed multiple cutaneous nodules at different locations and one with recurrence was re-treated and is currently disease-free after 22 months. No major local or systemic toxicities were noted for the duration of the study. Conclusion: ECT is a safe and effective therapy for incompletely excised MCTs in companion animals. Its ease of administration, lack of toxicities and low cost make it an attractive alternative to standard treatments and warrants further investigation
Dall’Unione alla fusione dei Comuni: le ragioni, le criticità e le forme
No full textSi tratta del saggio finale di un numero monografico dedicato al processo di trasformazione delle Unioni di comuni ed espone le le ragioni che possono spingere i Comuni ad intraprendere un processo di fusione, illustrandone al tempo stesso le possibili forme e le inevitabili criticità. A partire da una ricostruzione del quadro normativo, vengono analizzate le principali ragioni della costituzione di un Comune unico: ricerca di efficienza ed efficacia nell’azione di governo; legittimazione democratica e accountability; i costi della politica e gli incentivi finanziari. Le criticità attengono invece ai temi delle identità, dell'autonomia e della rappresentanza. Il saggio riflette sulle forme assunte dal fenomeno tanto su scala nazionale quanto a livello regionale
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