Encontrados 230 documentos, a visualizar página 1 de 23
Suicides in the Centre of Portugal: seven years analysis
Dias, Daniel; Mendonça, M. Cristina; Real, Francisco Corte; Vieira, Duarte Nuno; Teixeira, Helena M.As one of the more specific and distinctive problems of human beings, suicide has been investigated with increasing attention all over the world. Several risk factors have been described as well as limitations arising from their study. The World Health Organization estimates that this scourge affects one million people annually, which corresponds to one death every 40 s worldwide. According to recent studies, P...
Disrafismo espinhal oculto - acuidade para o diagnóstico
Silva, Helena M.; Centro Hospitalar do Porto - Hospital Maria Pia; Carvalho, Carmen; Centro Hospitalar do Porto - Maternidade Júlio DinisOs disrafismos espinhais ocultos apresentam uma incidência global desconhecida, representando uma entidade subdiagnosticada. O espectro clínico é amplo, podendo englobar anomalias cutâneas, malformações ortopédicas e/ou neuro-urológicas. Os sinais cutâneos axiais lombossagrados estão presentes em 50 a 80% dos casos, incluindo fossetas sacrococcígeas, sinus dérmicos, hemangiomas, lipomas, apêndices caudais, tufo...
Mastoidite aguda: aumento da incidência e das complicações?
Silva, Helena M.; Centro Hospitalar do Porto; Unidade Maria Pia- Serviço de Pediatria; Zilhão, Carla; Centro Hospitalar do PortoIntrodução: A mastoidite aguda é a principal complicação da otite média aguda (OMA).Vários estudos recentes revelam uma incidência crescente, frequentemente com complicações associadas. Objectivos: Descrever os casos de mastoidite aguda e detetar factores associados a uma maior morbilidade clínica. Métodos: Revisão dos processos clínicos referentes aos internamentos por mastoidite aguda no Serviço de Pediatria...
Cleanup of industrial effluents containing heavy metals: a new opportunity of v...
Soares, Eduardo V.; Soares, Helena M. V. M.Heavy metal pollution is a matter of concern in industrialised countries. Contrary to organic pollutants, heavy metals are not metabolically degraded. This fact has two main consequences: its bioremediation requires another strategy and heavy metals can be indefinitely recycled. Yeast cells of Saccharomyces cerevisiae are produced at high amounts as a by-product of brewing industry constituting a cheap raw mate...
Theoretical study of exciton migration in polymer-based solar cells
Barbosa, Helder M. C.; Correia, Helena M. G.; Marques, Luís; Ramos, Marta M. D.Poster apresentado no "11º Encontro Nacional de Química Física - 11ºENQF", Porto, Portugal, 09-10 maio 2013. ; Organic solar cells (OSC) are one of the most promising green technologies for energy harvesting. In these devices the active layer is composed of an organic blend of two polymers or by low weight molecule and a polymer. In either case, due to the nature of the materials used, especially of the polyme...
Understand the importance of molecular organization at polymer-polymer interfac...
Correia, Helena M. G.; Barbosa, Helder M. C.; Marques, Luís; Ramos, Marta M. D.Comunicação em painel apresentada no E-MRS 2013 - Symposium B ; To improve the efficiency of organic solar cells is necessary, for instance, to increase the open-circuit voltage or increase sun-light absorption by covering complementary regions of the solar spectrum. This can be achieved by using a donor-acceptor system composed of two polymers. The versatility of these materials has the advantage of enabling ...
Unravelling the effect of strand orientation on exciton migration in conjugated...
Correia, Helena M. G.; Barbosa, Helder M. C.; Marques, Luís; Ramos, Marta M. D.The study of the average distance that singlet excitons travel during their lifetime in conjugated polymers has attracted considerable attention during the past decade, because of its importance in the functioning of many polymer-based optoelectronic devices, like solar cells and photodetectors. Intriguingly, different values of exciton diffusion length have been extracted from experiments on seemingly identica...
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...
Cleanup of industrial effluents containing heavy metals : a new opportunity of ...
Soares, Eduardo V.; Soares, Helena M. V. M.Heavy metal pollution is a matter of concern in industrialised countries. Contrary to organic pollutants, heavy metals are not metabolically degraded. This fact has two main consequences: its bioremediation requires another strategy and heavy metals can be indefinitely recycled. Yeast cells of Saccharomyces cerevisiae are produced at high amounts as a by-product of brewing industry constituting a cheap raw mate...
Sexualidade e risco de gravidez na adolescência: desafios de uma nova realidade...
Silva, Helena M; Centro Hospitalar do Porto, Unidade Maria Pia, PortoIntrodução: A gravidez na adolescência tem assumido uma expressão significativa na sociedade portuguesa com uma prevalência a rondar os 14%. Este facto, aliado ao recente alargamentode atendimento pediátrico para os 18 anos, coloca novos desafios ao pediatra.Objectivos: Conhecer os padrões de sexualidade e contracepção na adolescência, procurando avaliar condutas sexuais com risco de gravidez.Métodos: Estudo tr...
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