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Results of Endovascular Procedures Performed in Dysfunctional Arteriovenous Acc...
Machado, S; Ferreira, A; Lucas, C; Gil, C; Fortes, A; Neves, FAim. Percutaneous endovascular procedures have become the standard treatment of arteriovenous fistulae and graft stenosis. This study evaluates the immediate results of angiographic procedures performed by nephrologists in patients with dysfunctional arteriovenous fistulae and arteriovenous graft stenosis. Patients and Methods. A retrospective analysis was performed on patients referred to the three Interventio...
Alterações nas capacidades motoras Bbsicas, em idosos institucionalizados subme...
Taveira, Daniel Gil C. R.Dissertação apresentado à Escola Superior de Educação do Instituto Politécnico de Castelo Branco com vista à obtenção do grau de Mestre em Actividade Física na Especialidade de Gerontomotricidade. ; Com o presente estudo pretendia-se conhecer, da forma mais aprofundada possível, a aptidão física funcional dos idosos institucionalizados a frequentarem aulas de actividade física, verificando se as habilidades mo...
Brain Natriuretic Peptide Levels Predict Morbidity and Mortality in Haemodialys...
Matias, P; Jorge, C; Aires, I; Lage, H; Gil, C; Gomes, F; Arranhado, E; Ferreira, ABackground: Brain natriuretic peptide is a predictor of mortality in multiple cardiovascular diseases but its value in patients with chronic kidney disease is still a matter of debate. Patients and methods: We studied 48 haemodialysis patients with mean age 70.0±13.9 years,62.5% female, 43.8% diabetics, with a mean haemodialysis time of 38.1±29.3 months. To evaluate the role of brain natriuretic peptide as a pr...
Effects of Sevelamer Hydrochloride and Calcium Carbonate on Renal Osteodystroph...
Ferreira, A; Frazão, JM; Monier-Faugere, MC; Gil, C; Galvão, J; Oliveira, C; Baldaia, J; Rodrigues, I; Santos, C; Ribeiro, S; Hoenger, R; Duggal, ADisturbances in mineral metabolism play a central role in the development of renal bone disease. In a 54-wk, randomized, open-label study, 119 hemodialysis patients were enrolled to compare the effects of sevelamer hydrochloride and calcium carbonate on bone. Biopsy-proven adynamic bone disease was the most frequent bone abnormality at baseline (59%). Serum phosphorus, calcium, and intact parathyroid hormone we...
Positron studies of the temperature-dependence of free volumes in Polydimethyls...
Marques, M. F. Ferreira; Gordo, P. M.; Kajcsos, Zs.; Gil, C. Lopes; Lima, A. P. de; Queiroz, D. P.; Pinho, M .N. deFree-volume parameters in polyurethane/urea membranes have been studied by positron annihilation lifetime and Doppler broadening measurements. The bi-soft segment membranes were obtained by varying the ratio of the structural constituents, polypropylene oxide and polydimethylsiloxane (PU/PDMS), with PDMS content from 25 to 75 wt%. The free-volume holes determined by PALS are correlated with gas permeation featu...
Positron annihilation and constant photocurrent method measurements on a-Si:H f...
Gordo, P. M.; Marques, M. F. Ferreira; Gil, C. Lopes; Lima, A. P. de; Lavareda, G.; Carvalho, C. Nunes de; Amaral, A.; Kajcsos, Zs.Defect structure of hydrogenated amorphous silicon thin-films was studied by positron annihilation spectroscopy (PAS), whereas the density of states below the Fermi level was measured by constant photocurrent method (CPM). Divacancies and large vacancy clusters were identified as the main defects present in these films, with relative concentrations strongly dependent on the rf-power. Correlation between PAS, CP...
Competitive positron and positronium trapping in porous media
Kajcsos, Zs.; Liszkay, L.; Duplâtre, G.; Lázár, K.; Lohonyai, L.; Varga, L.; Gordo, P. M.; Lima, A. P. de; Gil, C. Lopes de; Marques, M. F. FerreiraPositron annihilation acquired acceptance for structural investigation of solids but results in porous media--where positron lifetime spectroscopy (LT) reveals substantial Ps formation--were ambiguous. Data on zeolites lead to the conclusion that Ps trapping in competing "extended free volume" sites, inhomogeneous regions and grain boundaries occurs. Furthermore, positron trapping must also be considered. Syste...
Symmetry breakdown and coupling constants of leptons
Marques,Gil C.; Spehler,DominiqueBased on a new approach to symmetries of the fundamental interactions we deal, in this paper, with the electroweak interactions of leptons. We show that the coupling constants, arising in the way leptons are coupled to intermediate bosons, can be understood as parameters associated to the breakdown of SU(2) and parity symmetries. The breakdown of both symmetries is characterized by a new parameter (the asymetry...
Very high position resolution gamma imaging with resistive plate chambers
Blanco, A.; Carolino, N.; Correia, C. M. B. A.; Fazendeiro, L.; Ferreira, Nuno C.; Marques, M. F. Ferreira; Marques, R. Ferreira; Fonte, P.; Gil, C.In this study we present experimental results from a first prototype of a positron emission tomography system based on the resistive plate chamber (RPC) technology. The system is composed of two counting heads, each one containing 16 single-gap RPC detectors capable of detecting the photon interaction point in the transaxial plane. Uniformity studies were performed for image resolution and sensitivity, yielding...
Spatial resolution on a small animal RPC-PET prototype operating under magnetic...
Blanco, A.; Carolino, N.; Correia, C. M. B. A.; Fazendeiro, L.; Ferreira, Nuno C.; Marques, M. F. Ferreira; Marques, R. Ferreira; Fonte, P.; Gil, C.It has been demonstrated in previous work that the RPC-PET technology is able to deliver radioisotope image resolutions approaching the physical limits of the PET principle. Here we study, by simulation, the effect of the magnetic field on the positron range to evaluate whether the spatial resolution of the RPC-PET could be improved by using an intense magnetic field. Six positron emitters of interest to small ...
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