Encontrados 42 documentos, a visualizar página 1 de 5
Leonid Pavlovich Shilnikov: à memória de um atractor global
Em 26 de Dezembro de 2011, dobraram os sinos pela perda do matemático russo L. P. Shilnikov. De uma forma unânime à escala mundial, o seu trabalho tornou-se um clássico e uma referência obrigatória em qualquer manual da teoria de bifurcações, influenciando decisivamente o desenvolvimento da teoria qualitativadas equações diferenciais. A elegância dos seus resultados e o rigor das suas demonstrações constituíram ...
Tailor made degradable ureteral stents from natural origin polysaccharides
Barros, Alexandre A.; Duarte, Ana Rita C.; Pires, R. A.; Lima, Estêvão Augusto Rodrigues de; Mano, J. F.; Reis, R. L.A urinary stent is defined as a thin tube, which is inserted in the ureter to prevent or treat the obstruction of urine flow from the kidney. Silicone, latex, polyvinylchloride and polyurethanes are the most widely used materials for the preparation of stents. Nonetheless, severe clinical complications may result from the use of these materials such as fracture, encrustation and infection. In some of the cases,...
The effects of epiphytes on light harvesting and antioxidant responses in the s...
Costa, Monya; Silva, João; Olivé, Irene; Barrote, Isabel; Alexandre, A.; Albano, Sílvia; Santos, RuiPosidonia oceanica (L.) Delile is a subtidal seagrass whose leaves are commonly colonized by epiphytes. Epiphytes pose physical barriers to light penetration within the leaves, with possible significant impacts on photosynthesis. Furthermore, epiphytes can indirectly be responsible for leaf chlorosis, necrosis and senescence which are known to be related with the increase of oxygen reactive species (ROS) levels...
Identification of Foliar Diseases in Cotton Crop
Alexandre A. Bernardes; Jonathan G. Rogeri; Roberta B. Oliveira; Norian Marranghello; Aledir S. Pereira; Alex F. Araujo; João Manuel R.S. TavaresThe manifestation of pathogens in plantations is the most important cause of losses in several crops. These usually represent less income to the farmers due to the lower product quality as well as higher prices to the consumer due to the smaller offering of goods. The sooner the disease is identified the sooner one can control it through the use of agrochemicals, avoiding great damages to the plantation. This c...
Experimental testing, numerical modelling and seismic strengthening of traditio...
Alexandre A. Costa; António Arêde; Aníbal Costa; João Guedes; Bruno SilvaStone masonry is one of the oldest building techniques used worldwide and it is known to exhibit poor behaviour under seismic excitations. In this context, this work aims at assessing the in-plane behaviour of an existing double-leaf stone masonry pier by experimental testing. Additionally, a detailed 3D finite element numerical analysis based on micro-modelling of the original pier is presented (fully describi...
Out-of-plane behaviour of existing stone masonry buildings: experimental evalua...
Costa, Alexandre A.; António Arêde; Aníbal Costa; Carlos Sousa OliveiraMasonry structures can be considered as the simplest type of structures concerning its assemblage but, at the same time, it is one of the most complex construction materials in terms of mechanical properties and correct behaviour assessment. In this context, the work herein presented aims at describing an experimental testing campaign recently carried out in order to characterize the out-of-plane behaviour of t...
Alternativas de tratamento para pacientes pediátricos em ventilação mecânica cr...
Hanashiro,Milton; Franco,Antonio O. C.; Ferraro,Alexandre A.; Troster,Eduardo J.OBJETIVO: Determinar o impacto da transferência de uma população pediátrica para unidades de dependentes de ventilação mecânica (UDVMs) ou para ventilação mecânica domiciliar (VMD) na disponibilidade de leitos na unidade de terapia intensiva (UTI) pediátrica. MÉTODOS: Estudo longitudinal retrospectivo de crianças hospitalizadas que necessitavam de VM prolongada na UDVM do Hospital Auxiliar de Suzano, um hospita...
Electrodinâmica fluídica
Martins, Alexandre A.Este artigo irá tentar fornecer uma interpretação física das forças electromagnéticas e de inércia, mostrando um paralelo entre a equação da força electromagnética para uma partícula carregada e a equação da força hidrodinâmica para uma massa que se move imersa num fluido perfeito. As semelhanças entre estas duas equações contém evidências de que o vácuo se comporta como um fluido perfeito e de que as forças el...
Copulatory courtship song in Lutzomyia migonei (Diptera: Psychodidae)
Vigoder,Felipe M; Souza,Nataly A; Peixoto,Alexandre ALutzomyia migonei is a vector of leishmaniasis with a wide distribution in South America, which could favour population differentiation and speciation. Cryptic species of the Lutzomyia longipalpis complex, the widely distributed sand fly vector of visceral leishmaniasis in Latin America, have previously been shown to display distinct copulation songs. We found that Lu. migonei males also produce a song during c...
Sex pheromone and period gene characterization of Lutzomyia longipalpis sensu l...
Salomón,Oscar D; Araki,Alejandra S; Hamilton,James GC; Acardi,Soraya A; Peixoto,Alexandre ALutzomyia longipalpis s.l. is the primary vector of Leishmania (L.) infantum in the New World. In this study, male Lutzomyia longipalpis specimens from Posadas, Argentina were characterized for two polymorphic markers: the male sex pheromone and the period (per) gene. The male sex pheromone was identified as (S)-9-methylgermacrene-B, the same compound produced by Lu. longipalpis from Paraguay and many populatio...
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