20 documents found, page 1 of 2
Portugal in the nuclear realm: A case of broad ‘multilateralization’
Fernandes, S.; Ferreira, D. S.Nuclear proliferation and nuclear disarmament have regained centrality in the global security agenda. The weakening of existing regimes and the search by a growing number of states to acquire or extend their nuclear capacities have contributed to shape recent developments. This paper analyses how Portugal’s foreign policy orientations, grounded on its Euro-Atlantic identity with a global vocation and a colonial...
Política nuclear americana durante a guerra na Ucrânia
Ferreira, D. S.Os Estados Unidos da América e a Rússia, cuja agenda é dominada por questões estratégicas, possuem mais de 90% das armas nucleares do mundo. Esforços para tentar reduzir o seu número e a sua saliência na estratégia nuclear americana têm sido afetados por resistência doméstica e desenvolvimentos na esfera internacional. Atualmente, ao padrão de desrespeito de Moscovo por tratados de controlo de armamento, num co...
Physico-chemical and sensory interactions of arabica coffee genotypes in differ...
Ferreira, D. S.; Do Amaral, J. F.T.; Pereira, L. L.; Ferreira, J. M.S.; Guarçoni, R. C.; Moreira, T. R.; De Oliveira, A. C.; Rodrigues, W. N.Made available in DSpace on 2022-04-28T19:30:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01; The production of specialty coffee has several factors and parameters that are added up in the course of production, so that the quality is expressed in the act of consumption. Based on this scenario, this study included the analysis of ten genotypes of arabica coffee, the materials being subjected to i...
Sistema de suporte à decisão baseado em simulação para evitar situações de tens...
Ferreira, D. S.Apesar do usual emprego de aços estruturais modernos de alta tenacidade (classe API) a gasodutos, permanece a O alto período de permanência e a superlotação nos departamentos de emergência, são dois problemas recorrentes no setor de saúde, seja no serviço público ou privado. Para diminuir o tempo médio de permanência e combater a superlotação, não há dúvidas quanto a necessidade de dimensionar adequadamente div...
Co-assembly, spatiotemporal control and morphogenesis of a hybrid protein-pepti...
Inostroza-Brito, K. E.; Collin, E.; Siton-Mendelson, O.; Smith, K. H.; Monge-Marcet, A.; Ferreira, D. S.; Rodríguez, R. P.; Alonso, M.Controlling molecular interactions between bioinspired molecules can enable the development of new materials with higher complexity and innovative properties. Here we report on a dynamic system that emerges from the conformational modification of an elastin-like protein by peptide amphiphiles and with the capacity to access, and be maintained in, non-equilibrium for substantial periods of time. The system enabl...
Aging and attentional set shifting on WCST: An event-related EEG study
Fernandes, L. S.; Ferreira, D. S.; Almeida, P. R.; Dias, Nuno Sérgio MendesAs the brain ages, it suffers several neurochemical, structural and functional changes. These deficits are primarily reflected on daily memory tasks. In the present work, we use the Wisconsin Card Sorting Task (WCST) task to assess P300 component of the event-related potential (ERP) as a marker for aging. Considering age-related effects, WCST was applied to young, middle-aged and elder participants. Early-late ...
Effects of age-related cognitive deficits on EEG phase coherence
Ferreira, D. S.; Reis, J.; Portugal, A. M.; Pinho, F.; Jacinto, L.; Dias, N.Body and brain undergo several changes with aging. One of these changes is the loss of neuroplasticity, which leads to the decrease of cognitive abilities. Hence the necessity of stopping or reversing these changes is of utmost importance to contemporary society. In the present work, electroencephalogram (EEG) markers of cognitive decline are sought whilst the subjects perform the Wisconsin Card Sorting Test (W...
Peptide-based microcapsules obtained by self-assembly and microfluidics as cont...
Ferreira, D. S.; Reis, R. L.; Azevedo, Helena S.Peptides are excellent building blocks to form precise nanostructures by self-assembly. They can selfassemble into fibril nanostructures, thus recreating some of the architectural features of the natural extracellular matrix. Here, we used a microfluidic approach to drive the self-assembly of peptides of opposite charge into capsular structures for cell encapsulation. The obtained capsules presented a core shel...
Hyaluronan and self-assembling peptides as building blocks to reconstruct the e...
Ferreira, D. S.; Marques, A. P.; Reis, R. L.; Azevedo, Helena S.Self-assembling bioactive membranes, incorporating hyaluronan, a structural component of the skin extracellular matrix (ECM), and peptide amphiphiles presenting biochemical signals, are proposed in this work for recapitulating some aspects of the skin tissue microenvironment. In the herein presented strategy, the availability of cell-adhesion ligands (0–50% RGDS epitope) within 2D membranes is controlled aiming...
Spectroscopy microsystem for the detection of early cancer
Ferreira, D. S.; Monteiro, T. S.; Minas, GraçaThe research team is focused on the development of a chip-sized spectroscopy microsystem for the detection of gastrointestinal (GI) early cancerous lesions. The paper will briefly cover the outstanding properties of diffuse reflectance and fluorescence spectroscopy detection and the concept of co-integration of highly selective thin-films optical interference filters on silicon photodiodes, in order to meet the...