Encontrados 329 documentos, a visualizar página 1 de 33
Efectividade da Rede de Referenciação Perinatal da Região Centro
Costa, E.; Moleiro, P.; Carvalho, L.; Neves, F.; Oliveira, J.; Ventura, A.; Teixeira, A. L.; Martins, J.; Figueiredo, N.; Costa, R.; Peixoto, J.Resumo Em 1990 foi desenvolvida em Portugal uma Rede de Referenciação Perinalal, com definição dos limites e as responsabilidades assistenciais dos Hospitais de Apoio Perinatal Diferenciado (HAPD) e dos Hospitais de Apoio Perinatal (HAP). Graças ao espírito de cooperação c complementaridade desenvolvidos, os critérios de transferência iu útero e pós natal estão bem estabelecidos* Com os resultados do Registo Na...
Wavelength Conversion with MZI-SOAs
T. Silveira; N. Yan; L. Oliveira; A. Teixeira; A. Ferreira; E. Tangdiongga; P. Monteiro; A.M.J. KoonenWavelength multicasting at 40Gb/s is demonstrated by all-optical multi-wavelength conversion based on a single MZI-SOA. Simultaneous ITU grid 200GHz spaced one-to-four conversion is achieved with negligible sensitivity difference among all the multicast channels. Furthermore, we propose some new all-optical applications enabled by this technology. ; Wavelength multicasting at 40Gb/s is demonstrated by all-opti...
Linear invariant systems theory for signal enhancement
A. M. Tomé; A. R. Teixeira; A. Teixeira; G. Miguel; P. Georgieva; E. w. LangThis paper discusses a linear time invariant (LTI) systems approach to signal enhancement via projective subspace techniques. It provides closed form expressions for the frequency response of data adaptive finite impulse response eigenfilters. An illustrative example using speech enhancement is also presented. ; Este artigo apresenta a aplicação da teoria de sistemas lineares invariantes no tempo...
Screening of novel yeast inulinases and further application to bioprocesses
Paixão, Susana M.; Teixeira, Pedro D.; Silva, Tiago P.; Teixeira, A. V.; Alves, Luís ManuelInulin is a carbohydrate composed of linear chains of ß-2,1-linked D-fructofuranose molecules terminated by a glucose residue through a sucrose-type linkage at the reducing end. Jerusalem artichoke (JA) is one of the most interesting materials among unconventional and renewable raw materials, with levels of inulin reaching 50–80% of dry matter. Inulin or inulin-rich materials can be actively hydrolyzed by micro...
Zygosaccharomyces bailii strain talf1 inulinases: a versatile tool for bioproce...
Paixão, Susana M.; Teixeira, Pedro D.; Silva, Tiago P.; Teixeira, A. V.; Alves, Luís ManuelFructans are one of the most abundant non-structural polysaccharides found in a wide range of plants. Inulin is a polydisperse fructan polymer composed by linear chains of b-2, 1-linked D-fructofuranose molecules terminated by a glucose residue through a sucrose-type linkage at the reducing end. Inulin or inulin-rich materials can be actively hydrolyzed into fermentable sugars (glucose and fructose) using inuli...
Flow cytometric method for cell viability evaluation of Gordonia alkanivorans s...
Teixeira, A. V.; Silva, Tiago P.; Silva, Teresa Lopes da; Paixão, Susana M.; Alves, Luís ManuelThis work reports the development of a rapid flow cytometric method for the viability assessment of Gordonia alkanivorans strain 1B, a bacterium used in the biodesulfurization process. To demonstrate that it is possible to monitor by flow cytometric analysis changes in this bacterium physiological state, positive controls using the 5(6)-carboxyfluorescein diacetate (CFDA) and propidium iodide (PI) staining mixt...
Flow cytometric method for cell viability evaluation of Gordonia alkanivorans s...
Teixeira, A. V.; Silva, Tiago P.; Silva, Teresa Lopes da; Paixão, Susana M.; Alves, Luís ManuelThe most commonly method used for sulfur removal from fossil fuels is hydrodesulfurization, a physico-chemical process at very high temperatures and pressures. An alternative to this process is biodedesulfurization (BDS), a microbiological process that works at atmospheric pressure and temperature making it easier to work with and less expensive. It also as the advantage of easily desulfurizing recalcitrant sul...
Optimization of low sulfur carob pulp liquor as carbon source for fossil fuels ...
Silva, Tiago P.; Paixão, Susana M.; Teixeira, A. V.; Roseiro, J. Carlos; Alves, Luís ManuelBackground:Biodesulfurization (BDS) is a complementary technology to hydrodesulfurization since it allows the removal of recalcitrant sulfur compounds present in fossil fuels. The cost of culture medium to produce the biocatalysts is still one limitation for BDS application. Carob pulp, as an alternative carbon source, can reduce this cost. However, the presence of sulfates is critical, since BDS is inhibited a...
Síntese de ácidos e ésteres mono- e bisfosfónicos derivados do indazole
Afonso, S. S.; Teixeira, A. P. S.; Martins, M. R.; Teixeira, Fátima C.Os bisfosfonatos (BPs) constituem um grupo de compostos derivados do ácido bisfosfónico e dos seus sais, onde o grupo P-O-P foi substituído por um bioisoster, resultando na estrutura P-C-P, que lhe confere maior estabilidade química e metabólica. Os bisfosfonatos (BPs) constituem uma classe importante de fármacos, com aplicações terapêuticas no tratamento de doenças do metabolismo mineral do osso, como a osteop...
New azaheterocyclic aromatic diphosphonates for hybrid materials for fuel cell ...
Teixeira, Fátima C.; Rangel, C. M.; Teixeira, A. P. S.New azaheterocyclic aromatic diphosphonate derivatives of benzimidazole and benzotriazole were synthesized by nickel-catalyzed Arbuzov reaction of 4,7-dibromo-2,1,3-benzothiadiazole with triethyl phosphite, followed by reductive sulfur extrusion reaction and cyclization. This new strategy allowed us to obtain these compounds with high efficiency, with the generation of these azaheterocyclic aromatic diphosphona...
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