Encontrados 24 documentos, a visualizar página 1 de 3
General model for delayed feedback and its application to transimpedance amplif...
Alves, L. N.; Barbosa, L.; Macedo, E.A.L.; Aguiar, R.L.Delays in real systems can be of two types: i) intrinsic delays - due to the physical principles of operation of each electronic device; ii) designed delays - due to extra circuits used to add the desired delay. Previous work established the possibility of achieving bandwidth improvements using small delays inside the feedback loop of feedback amplifiers. The modeling approach followed on these contributions us...
Formação de raízes adventícias em microestacas de oliveira (Olea europaea L.); ...
Macedo, E.; Vieira, C.; Carrizo, D.; Porfírio, S.; Holger, H.; Arnholdt-Schmitt, B.; Calado, M.L.; Peixe, A.Com o objetivo de identificar tanto fenómenos histológicos como alterações na atividade das peroxidases e polifenoloxidases durante a formação de raízes adventícias, em oliveira realizaram-se ensaios utilizando microestacas da cultivar ‘Galega vulgar’ previamente instalada em cultura in vitro. As bases dos explantes foram submetidas a um tratamento indutor do enraizamento, por imersão rápida (10 segundos) numa ...
Involvement of alternative oxidase (AOX) in adventitious rooting of Olea europa...
Santos Macedo, E.; Sircar, D.; Cardoso, H.G.; Peixe, A; Arnholdt-Schmitt, BAlternative oxidase (AOX) has been proposed as a functional marker candidate in a number of events involving cell differentiation, including rooting efficiency in semi-hardwood shoot cuttings of olive (Olea europaea L.). To ascertain the general importance of AOX in olive rooting, the auxin-induced rooting process was studied in an in vitro system for microshoot propagation. Inhibition of AOX by salicylhydroxa...
Lysozyme and bovine serum albumin partitioning in polyethylene glycol–phenylala...
Silvério, Sara C.; Ferreira, Luísa A.; Martins, J. A.; Marcos, João Carlos; Macedo, E. A.; Teixeira, J. A.Polyethylene glycol (PEG) with average molecular weight of 8000 was used as a model polymer and modified by introducing an amino acid (phenylalanine) in its hydroxyl terminals. The effect of different percentages of the conjugate polymer in relation to the total polymer on binodal curve of PEG-8000–potassium phosphate buffer (KPB), pH 7.2 aqueous two-phase systems and solute partitioning was explored. The parti...
(Liquid + liquid) equilibria of polymer-salt aqueous two-phase systems for lacc...
Lladosa, Estela; Silvério, Sara C.; Rodríguez, Oscar; Teixeira, J. A.; Macedo, E. A.Aqueous two-phase systems (ATPS) are recognized as very suitable techniques for the recovery of target solutes in biological applications. Three new phase diagrams of (UCON 50-HB-5100 + potassium citrate + water), (UCON 50-HB-5100 + sodium formate + water), and (UCON 50-HB-5100 + potassium formate + water) systems were measured at 23 C. The binodal curves were successfully described using the empirical equation...
Expression studies of AOX during adventitious root induction in Olea europaea L.
Macedo, E.S.; Cardoso, H.G.; Peixe, A.; Arnholdt-Schmitt, B.Recently, identification of four alternative oxidase (AOX) gene sequences from olive (Olea europaea L.) has been reported from our group. Three genes could be classified as members of the sub-family AOX1 and one as belonging to the sub-family of AOX2. AOX has been proposed as functional marker candidate for easy-to-root olive genotypes. Validation of AOX as an appropriate marker candidate needs to highlight a c...
Solubility of drug-like molecules in pure, mixed and supercritical solvent syst...
Mota, F.L.; Queimada, A.J.; Pinho, Simão; Macedo, E.A.Most of the active pharmaceutical ingredients (API) are purified by crystallization being solubility a key property, and it also affects their efficacy, release, transport and absorption in the organism [1]. Although of extreme importance, data involving druglike molecules are still scarce. In recent years, efforts have been made towards the development of predictive tools to calculate phase behaviour of the AP...
Liquid-liquid equilibrium of water +1-butanol + amino acid (glycine or DL-alani...
Santos, G.R.; Souza, D.C.; Aznar, M.; Pinho, Simão; Macedo, E.A.Amino acid play an important role both in animal metabolism and in industrial processes. Since they are rarely found in nature in free form, they must be obtained form hydrolisis of protein-containing materials, or by fermentation. These production methods often results in aqueouse mixtures containing various solutes included several types of amino acids. As a consequence, the cost of the separation processses ...
Uma metodologia de estimação da carga tributária líquida brasileira trimestral ...
Santos,Claudio Hamilton M. dos; Silva,Antonio Carlos Macedo e; Ribeiro,Márcio BrunoEste artigo apresenta uma metodologia simplificada de estimação, em bases trimestrais, das transferências governamentais e da carga tributária líquida da economia brasileira no período 1995-2009. O artigo descreve, ainda, os principais fatos estilizados observados no comportamento das referidas séries (e de desagregações relevantes destas) no período em questão, chamando a atenção para o fato de que o perfil di...
Para uma antropologia da palavra
Silva, Ana Maria Cabral de Macedo eO presente trabalho tem por objectivo reflectir sobre as linhas de força que conduzem o pensamento especulativo de Álvaro Ribeiro, autor que determina os pressupostos da filosofia portuguesa, onde edifica a sua visão teológica, cosmológica e antropológica. Ribeiro procurou cimentar a existência do pensamento nacional, contido nos textos teológicos, poéticos e literários, numa perspectiva messiânica, influenciad...
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