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Leprosy and rheumatoid arthritis: consequence or association?
Henriques, C; Lopéz, B; Mestre, T; Grima, B; Panarra, A; Riso, NLeprosy or Hansen's disease is a chronic granulomatous infectious disease caused by Mycobacterium leprae with a high prevalence in some developing countries however, it is rarely seen in non-endemic regions. Arthritis has been described in all types of Hansen's disease. Chronic arthritis is known to exist even in paucibacillary forms, resolved or treated disease and in patients without reaction, suggesting a pe...
Aberrant signaling in T-cell acute lymphoblastic leukemia: biological and thera...
Cardoso,B.A.; Gírio,A.; Henriques,C.; Martins,L.R.; Santos,C.; Silva,A.; Barata,J.T.T-cell acute lymphoblastic leukemia (T-ALL) is a biologically heterogeneous disease with respect to phenotype, gene expression profile and activation of particular intracellular signaling pathways. Despite very significant improvements, current therapeutic regimens still fail to cure a portion of the patients and frequently implicate the use of aggressive protocols with long-term side effects. In this review, w...
Al-containing MCM-41 type materials prepared by different synthesis methods: hy...
Lourenço, J. P.; Fernandes, A.; Henriques, C.; Ribeiro, M. F.Al-containing MCM-41 type materials were prepared by three different synthesis methods (aluminum grafting on the calcined MCM-41, pH adjustment during the crystallization period and crystallization in the presence of zeolite seeds). The samples were characterized by powder XRD, nitrogen adsorption, 27Al MAS NMR and FTIR with pyridine as probe molecule. All the samples exhibit a high hydrothermal stability at hi...
Influence of thermal treatments on the basic and catalytic properties of Mg,Al-...
Bastiani,R.; Zonno,I. V.; Santos,I. A. V.; Henriques,C. A.; Monteiro,J. L. F.This work studied the influence of calcination conditions on basic properties and catalytic performance of Mg,Al-mixed oxides derived from a hydrotalcite sample (Al/(Al+Mg)=0.20). Various heating rates, calcination atmospheres and lengths of calcination at 723K were evaluated. TPD of CO2 and retroaldolization of diacetone alcohol (DAA) were used to determine the basic properties of the mixed oxides. The basic s...
Extraction of aluminium surface energies from slab calculations: perturbative a...
Fiolhais, Carlos; Almeida, L. M.; Henriques, C.Surface energies of aluminium ((1 1 1), (1 1 0) and (1 0 0)) were calculated in second-order perturbation theory based on the jellium model, and by full atomistic models using a Gaussian basis set, in the framework of density functional theory. In both cases, surface energies were extracted from slab calculations using the incremental method, which considers two slabs with consecutive numbers of layers (6 and 7...
Dependence of metal surface properties on the valence-electron density in the s...
Brajczewska, M.; Henriques, C.; Fiolhais, C.The stabilized jellium model is the simplest model which yields realistic results for the physical properties of simple metals. For the surface properties, its single input is the valence-electron density, which is described by the density parameter rs. We remark that the surface energy and the work function as a function of rs, within that model, are reasonably approximated by power laws and compare that behav...
Metallic slabs: perturbative treatments based on jellium
Fiolhais, C.; Henriques, C.; Sarría, I.; Pitarke, J. M.We examine first-order perturbative results based on jellium for the surface energy of slabs of simple metals, using various local pseudo-potentials (Ashcroft, Heine–Abarenkov and evanescent core). The difference between the pseudo-potential and the jellium potential is averaged along the plane parallel to the surface. We compare these perturbative results with those of the stabilized-jellium model (a modificat...
Efficient co-templating roles of amines and amides admixed with alkylammonium s...
Borges, C.; Ribeiro, M. F.; Henriques, C.; Duarte, M.; Lourenço, J. P.; Gabelica, Z.Two different aluminophosphate structures were synthesised in aqueous media using as main template methylamine (MA), directly added, or generated in situ from methylformamide (MF). Both involve novel AlPO4-n topologies that undergo structural transformations upon template removal, yielding above 350°C microporous thermostable materials with interesting properties. Tetraalkylammonium (TEA) cations were used opti...
Slabs of stabilized jellium: Quantum-size and self-compression effects
Sarria, I.; Henriques, C.; Fiolhais, C.; Pitarke, J. M.We examine thin films of two simple metals (aluminum and lithium) in the stabilized jellium model, a modification of the regular jellium model in which a constant potential is added inside the metal to stabilize the system for a given background density. We investigate quantum-size effects on the surface energy and the work function. For a given film thickness we also evaluate the density yielding energy stabil...
Synthesis and acidity characterization of CoAPO-37
Costa, C. S.; Lourenço, J. P.; Henriques, C.; Antunes, A. P.; Ribeiro, F. R.; Ribeiro, M. F.; Gabelica, Z.A well-crystallized sample of CoAPO-37 was prepared. The incorporation of cobalt in the FAU structure framework was indirectly shown by FTIR spectroscopy, which shows peaks assigned to Bronstëd acid sites.
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