Browsing by Issue Date, starting with "1996"
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- Agostinho, o roubo das pêras e os porcosPublication . Antunes, DavidTrata-se de um ensaio longo, em que se explora a questão da infelicidade da linguagem, e da consequente impossibilidade de enunciados unívocos, na esteira das teses da Desconstrução. Neste texto, contudo, essa questão é mais acutilante porque o objecto de análise é um texto de natureza confessional e autobiográfica, a saber: o Livro II das Confissões de S. Agostinho.
- MUS-E Portugal fonte de equilíbrio e de tolerância: projecto pedagógico multicultural num meio escolar desfavorecidoPublication . Cruz, Cristina Brito DaProjecto pedagógico multicultural num meio escolar desfavorecido.
- Da força argumentativa de até agora: a oralidade no pré-escolarPublication . Sousa, OtíliaA expressão até agora marca a constreução de uma situação durativa limitada à direita. O limite é estabelecido por agora, marcador que refere o tempo da fala...
- As mulheres jornalistasPublication . Subtil, Filipa Mónica de Brito GonçalvesHá poucos anos atrás, José Eduardo Moniz resolveu despedir Maria Elisa e Margarida Marante. Que pôde a notoriedade das televedetas perante o poder de decisão administrativa do director de programas? Quase sem presença até 1974, as jornalistas representam agora cerca de 30% do total dos profissionais: 1142 mulheres, num universo de 3879.[1] Mas ao lado dos grandes proprietários das empresas de imprensa como Francisco Pinto Balsemão, Luís Silva ou Carlos Barbosa não se encontra nenhuma mulher. Situação idêntica ocorre na direcção dos principais jornais, rádios e televisões. Até ao momento em que escrevo este texto, nenhuma mulher tem o nome no lugar onde nos habituámos a ver os de Vicente Jorge Silva, Bettencourt Resendes ou José António Saraiva. Excepção feita ao semanário O Diabo, as únicas mulheres directoras de órgãos de comunicação social encontram-se nas revistas dirigidas ao público feminino. São também escassos os cargos de chefia ocupados por mulheres nas redacções. A elite jornalística continua, portanto, a ser predominantemente masculina, o que significa que ao ingresso das mulheres na profissão não tem correspondido idêntico acesso a lugares de relevo. No jornalismo, as mulheres encontram-se, na sua esmagadora maioria, a desempenhar funções de execução. À visibilidade crescente não corresponde o poder nas redacções.
- Sequencing of a 17.6 kb segment on the right arm of yeast chromosome VII reveals 12 ORFs, including CCT, ADE3 and TR-I genes, homologues of the yeast PMT and EF1G genes, of the human and bacterial electron-transferring flavoproteins (beta-chain) and of the Escherichia coli phosphoserine phosphohydrolase, and five new ORFs.Publication . Guerreiro, Paulo; Barreiros, Tânia; Soares, Helena; Cyrne, Luísa; Maia e Silva, Alexandra; Rodrigues-Pousada, ClaudinaA 17.6 kb DNA fragment from the right arm of chromosome VII of Saccharomyces cerevisiae has been sequenced and analysed. The sequence contains twelve open reading frames (ORFs) longer than 100 amino acids. Three genes had already been cloned and sequenced: CCT, ADE3 and TR-I. Two ORFs are similar to other yeast genes: G7722 with the YAL023 (PMT2) and PMT1 genes, encoding two integral membrane proteins, and G7727 with the first half of the genes encoding elongation factors 1gamma, TEF3 and TEF4. Two other ORFs, G7742 and G7744, are most probably yeast orthologues of the human and Paracoccus denitrificans electron-transferring flavoproteins (beta chain) and of the Escherichia coli phosphoserine phosphohydrolase. The five remaining identified ORFs do not show detectable homology with other protein sequences deposited in data banks. The sequence has been deposited in the EMBL data library under Accession Number Z49133.
- The Tetrahymena chaperonin subunit CCT eta gene is coexpressed with CCT gamma gene during cilia biogenesis and cell sexual reproductionPublication . Cyrne, Luísa; Guerreiro, Paulo; Cardoso, Ana Cristina; Rodrigues-Pousada, Claudina; Soares, HelenaWe report here the cloning and the characterization of the T. pyriformis CCT eta gene (TpCCT eta) and also a partial sequence of the corresponding T. thermophila gene (TtCCT eta). The TpCCt eta gene encodes a protein sharing a 60.3% identity with the mouse CCT eta. We have studied the expression of these genes in Tetrahymena exponentially growing cells, cells regenerating their cilia for different periods and during different stages of the cell sexual reproduction. These genes have similar patterns of expression to those of the previously identified TpCCt gamma gene. Indeed, the Tetrahymena CCT eta and CCT gamma genes are up-regulated at 60-120 min of cilia recovery, and in conjugation when vegetative growth was resumed and cell division took place. Our results seem to indicate that both CCT subunits play an important role in the biogenesis of the newly synthesized cilia of Tetrahymena and during its cell division.
- Particle agglomeration study in rf silane plasmas: In situ study by polarization-sensitive laser light scatteringPublication . Courteille, C.; Hollenstein, C.; Dorier, J. L.; Gay, P.; Schwarzenbach, W.; Howling, A. A.; Bertran, E.; Viera, G.; Martins, R.; Maçarico, António Filipe Ruas da TrindadeTo determine self-consistently the time evolution of particle size and their number density in situ multi-angle polarization-sensitive laser light scattering was used. Cross-polarization intensities (incident and scattered light intensities with opposite polarization) measured at 135 degrees and ex situ transmission electronic microscopy analysis demonstrate the existence of nonspherical agglomerates during the early phase of agglomeration. Later in the particle time development both techniques reveal spherical particles again. The presence of strong cross-polarization intensities is accompanied by low-frequency instabilities detected on the scattered light intensities and plasma emission. It is found that the particle radius and particle number density during the agglomeration phase can be well described by the Brownian free molecule coagulation model. Application of this neutral particle coagulation model is justified by calculation of the particle charge whereby it is shown that particles of a few tens of nanometer can be considered as neutral under our experimental conditions. The measured particle dispersion can be well described by a Brownian free molecule coagulation model including a log-normal particle size distribution. (C) 1996 American Institute of Physics.
- A light stop and electroweak baryogenesisPublication . Delepine, D.; Gerard, J. M.; Felipe, Ricardo Gonzalez; Weyers, J.The possibility of creating baryon asymmetry at the electroweak phase transition in the minimal supersymmetric standard model is considered for the case when right-handed squarks are much lighter than left-handed ones. It is shown that the usual requirement upsilon(T-c)/T-c greater than or similar to 1 for baryogenesis can be satisfied in a range of the parameters of the model, consistent with present experimental bounds.
- The three-loop SSM beta-functionsPublication . Ferreira, P. M.; Jack, I.; Jones, D. R. T.We present the supersymmetric standard model three-loop beta-functions for gauge and Yukawa couplings and consider the effect of three-loop corrections on the standard running coupling analyses.
- Characterization of a polyubiquitin gene in T. thermophila and of ubiquitin gene expression during sexual reproduction and under stress conditionsPublication . Guerreiro, Paulo; Rodrigues-Pousada, ClaudinaA 5-unit polyubiquitin gene, TTU3, was isolated from a T. thermophila genomic library and sequenced. This gene presents an extra triplet coding for Phe, a AGAGA motif and a putative HSE element in its 5'-non-coding region. The ubiquitin gene expression in this ciliate was investigated by Northern blot hybridization in conjugating cells or cells under stress conditions. Exponentially growing cells express two ubiquitin mRNAs of 0.75 and 1.8 kb and a new species of 1.4 kb is induced under hyperthermic stress. During sexual reproduction of the cells (conjugation) the 1.8-kb mRNA is still transcribed whereas the steady-state population of the 0.75 mRNA transcripts is strongly diminished. Southern blot analysis suggests that ubiquitin in T. thermophila constitutes a large family of about ten members.