Encontrados 117 documentos, a visualizar página 1 de 12
Síndrome Febril e Coma. Considerações a Propósito de Um Caso Clínico
M., Leite; J., Estrada; J., Ramos; A., Marques; L., Ventura; J. P., Vieira; C., Trigo; D., BarataA endocardite infecciosa é relativamente pouco frequente na idade pediátrica, mas a sua morbilidade e mortalidade são elevadas.Os autores descrevem um caso clínico de endocardite infecciosa aguda por Staphylococcus aureus numa criança de 5 anos de idade, sem factores de risco conhecidos, diagnosticada na sequência de complicações neurológicas (degradação súbita do estado de consciência e sinais neurológicos foc...
Síndroma de Imunodeficiência Severa Combinada. A Propósito de um Caso
Carvalho, C.; Marques, L.; Ferreira, P.; Araújo, F.; Chorão, A.; Santos, E.; Vilarinho, A.As Imunodeficiências Severas Combinadas (SCID) são um grupo heterogéneo de doenças. caracterizadas por profunda deficiência da imunidade celular e humoral e que compreende entidades funcional e geneticamente muito diversas. Os doentes afectados morrem geralmente durante o primeiro ano de vida, a menos que seja efectuado transplante medular ou tratamento enzimático substitutivo.Os autores descrevem um caso de um...
Amine-modified Carbon Aerogels for CO2 Capture
Marques, L.M.; Carrott, P.J.M.; Ribeiro Carrott, M.M.L.Ten different amines of different molar mass and structure were deposited from aqueous and methanolic solutions of different concentrations onto two types of carbon aerogel. Thermogravimetric analysis (TGA) was used to quantify the loading, thermal stability and CO2 capture capacity of the materials. Our results show that the amount of amine deposited did not depend on the solvent used, but was generally greate...
CO2 capture by amine impregnated carbon aerogels
Marques, L.M.; Carrott, P.J.M.; Ribeiro Carrott, M.M.L.In this work, CO2 adsorption/ desorption performance over carbon aerogels impregnated with amines of different molecular mass and structure, is reported.
Caracterização das infeções em doentes com Síndrome de deleção 22q11.2
Oliveira, M.; Teixeira, C.; Vasconcelos, J.; Neves, E.; Álvares, S.; Guedes, M.; Marques, L.RESUMO Introdução: O Síndrome de deleção 22q11.2 (SD22q11.2) tem uma incidência de 1/2000 a 1/7000 nados-vivos. Caracteriza-se por um grau variável de imunodeficiência que predispõe a infeções, nomeadamente sinopulmonares. Material e métodos: Estudo retrospetivo de 12 doentes, todos apresentando a del22q11.2 de novo, incidindo na caracterização imunológica e no tipo e número de infeções documentadas. Resultados...
Influence of composition, bonding characteristics and microstructure on the ele...
Borges, Joel; Fonseca, C.; Barradas, Nuno P.; Alves, Eduardo; Girardeau, Thierry; Paumier, Fabien; Vaz, F.; Marques, L.Thin films of AlOxNy were deposited by magnetron sputtering in a wide composition range. Different structures and morphologies were observed, depending on the composition and bonding states, which opened the possibility to tailor the properties of this oxynitride system between those of pure Al and those of nitride and oxide films. In a wide range of stoichiometries, one can report the formation of nanocomposit...
First-principles study of eletronic properties of radical polymers for organic ...
Barbosa, Helder M. C.; Marques, L.; Ramos, Marta M. D.Nowadays, there is an increasing demand for suitable energy storage devices to power the electronic devices used in a society continually oriented to technology and mobility. In order to solve this problem, and allied to environmental concerns, organic radical batteries (ORB) have been considered as possible solution by the electronic industry. In these devices, the electrodes consist on a moiety of a radical ...
Experiments and modelling in N2-H2 capacitively coupled radio-frequency discha...
Marques, L.; Mahjoub, A.; Pintassilgo, C. D.; Carrasco, N.; Cernogora, G.; Alves, L. L.This work uses experiments and simulations to analyze the modifications induced in pure N2 capacitively coupled radio-frequency discharges, running at low pressure (0.6–1.2 mbar) and low power (5–20 W), by the addition of small amounts of H2 (up to 5%). Simulations use a hybrid code coupling a two-dimensional time-dependent fluid module, describing the dynamics of the charged particles, to a zero-dimensional ki...
Pulsed laser deposition of semiconducting nanoparticles : optical emission spec...
Marques, L.; Ramos, Marta M. D.; Gomes, M. J. M.Memory devices that use seminconductor nanocrystals (NC) for charge storage began to receive considerable attention in recent years due to their excellent performance, high capacity of memory and miniaturization. In order to integrate these materials into devices, formation of NCs and oxide layers with controlled stoichiometry, dimensions and homogeneity are required. Pulsed laser deposition (PLD) techniques ar...
Influence of electrode degradation on organic solar cells functioning – a compu...
Barbosa, Hélder M. C.; Correia, Helena M. G.; Marques, L.; Ramos, Marta M. D.Recently, organic solar cells (OSC) have reached the efficiency of 10% becoming a reliable alternative to the conventional high cost inorganic solar cells. However, to gain a place in the competitive market of solar cells it is necessary to improve their lifetime. Due to the nature of the materials used, there are several degradation mechanisms [1] that lead to a decrease on device efficiency and thus to its fa...
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