O laboratório de microbiologia dos alimentos do Instituto Ricardo Jorge na investigação de surtos de toxinfeção alimentar

Apresentação do INSA, I.P., do Departamento de Alimentação e Nutrição e do Laboratório de Microbiologia. Conceitos de Microbiologia/ Microbiologia Alimentar. Importância da análise microbiológica. Vigilância microbiológica em unidades de restauração coletiva. Estudo e investigação de surtos de toxinfeções alimentares

Fractional variational problems depending on indefinite integrals and with delay

The aim of this paper is to exhibit a necessary and sufficient condition of optimality for functionals depending on fractional integrals and derivatives, on indefinite integrals and on presence of time delay. We exemplify with one example, where we nd analytically the minimizer.

A Caputo fractional derivative of a function with respect to another function

In this paper we consider a Caputo type fractional derivative with respect to another function. Some properties, like the semigroup law, a relationship between the fractional derivative and the fractional integral, Taylor’s Theorem, Fermat’s Theorem, etc., are studied. Also, a numerical method to deal with such operators, consisting in approximating the fractional derivative by a sum that depends on the first-order derivative, is presented. Relying on examples, we show the efficiency and applicability of the method. Finally, an application of the fractional derivative, by considering a Population Growth Model, and showing that we can model more accurately the process using different kernels for the fractional operator is provided.

Imagens da ficção portuguesa contemporânea : Almeida Faria

Recursos Educativos

Modeling some real phenomena by fractional differential equations

This paper deals with fractional differential equations, with dependence on a Caputo fractional derivative of real order. The goal is to show, based on concrete examples and experimental data from several experiments, that fractional differential equations may model more efficiently certain problems than ordinary differential equations. A numerical optimization approach based on least squares approximation is used to determine the order of the fractional operator that better describes real data, as well as other related parameters.

Determination of potassium and sodium in an ash sample by gamma-ray spectroscopy

Neutron activation analysis and gamma-ray spectroscopy were used to determine the quantity of potassium and sodium in an ash sample of Tabebuia sp bombarded with thermal neutrons. These techniques, widely applied in nuclear physics, can be used in the context of wood science as an alternative for the usual physical chemistry methods applied in this area. The quantity of K and Na in an 8.60 +/- 0.10 mg of ash was determined as being 1.3 +/- 0.3 mg and 11.0 +/- 1.8 mu g, respectively. The ratio of Tabebuia sp converted into ash was also determined as 0.758 +/- 0.004%.

La parodia como forma expresiva utilizada en la novela Tierra de Ricardo Lindo en su relectura del pasado colonial

La presente investigación sobre la parodia como forma expresiva en la novela “Tierra” de Ricardo Lindo, ofrece un estudio que permite conocer el pasado colonial salvadoreño y centroamericano inmerso en el texto. El análisis de la novela “Tierra”, como texto modélico, está enfocado en un estudio exhaustivo sobre aspectos narrativos que el escritor utilizó para representar un periodo de la historia salvadoreña, se habla de ese periodo de conquista y colonización. La finalidad de este trabajo es identificar la parodia como forma expresiva utilizada en la novela Tierra de Ricardo Lindo para leer el pasado colonial. Este trabajo en sí, aborda la relación de aquellos aspectos contextuales y estilísticos que contiene a la nueva novela histórica; en otras palabras, es un estudio que muestra el tipo de reciprocidad que existe entre el texto y contexto, aspectos esenciales de la nueva narrativa histórica como una nueva relectura del pasado colonial.

Silenciamento do canal de potássio Eag1 potencializa efeitos da temozolomida em células U-87 MG de glioblastoma multiforme

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciências da Saúde, Programa de Pós-Graduação em Ciências da Saúde, 2015.

Sociedade e cultura portuguesas II : Almeida Garrett e o romantismo liberal

Académico - Licenciaturas

Ricardo Pérez Monfort: “La historia es fundamental para generar una conciencia sobre la necesidad de una transformación”

Infatigable en la búsqueda, observación y conocimiento de las expresiones culturales en México, Pérez Montfort considera que el estudio y la divulgación de la historia representan un generador de conocimiento, conciencia e identidad para desentrañar el enigmático ser del mexicano.

Estudo de massa cerâmica triaxial visando à otimização do ciclo de queima da indústria de cerâmica estrutural

Over recent years the structural ceramics industry in Brazil has found a very favorable market for growth. However, difficulties related to productivity and product quality are partially inhibiting this possible growth. An alternative for trying to solve these problems and, thus, provide the pottery industry the feasibility of full development, is the substitution of firewood used in the burning process by natural gas. In order to contribute to this process of technological innovation, this paper studies the effect of co-use of ceramic phyllite and kaolin waste on the properties of a clay matrix, verifying the possible benefits that these raw materials can give to the final product, as well as the possibility of such materials to reduce the heat load necessary to obtain products with equal or superior quality. The study was divided into two steps: characterization of materials and study of formulations. Two clays, a phyllite and a residue of kaolin were characterized by the following techniques: laser granulometry, plasticity index by Atterberg limits, X-ray fluorescence, X-ray diffraction, mineralogical composition by Rietveld, thermogravimetric and differential thermal analysis. To study the formulations, specifically for evaluation of technological properties of the parts, was performed an experimental model that combined planning involving a mixture of three components (standard mass x phyllite x kaolin waste) and a 23 factorial design with central point associated with thermal processing parameters. The experiment was performed with restricted strip-plot randomization. In total, 13 compositional points were investigated within the following constraints: phyllite ≤ 20% by weight, kaolin waste ≤ 40% by weight, and standard mass ≥ 60% by weight. The thermal parameters were used at the following levels: 750 and 950 °C to the firing temperature, 5 and 15 °C/min at the heating rate, 15 and 45min to the baseline. The results showed that the introduction of phyllite and/or kaolin waste in ceramic body produced a number of benefits in properties of the final product, such as: decreased absorption of water, apparent porosity and linear retraction at burn; besides the increase in apparent specific mass and mechanical properties of parts. The best results were obtained in the compositional points where the sum of the levels of kaolin waste and phyllite was maximal (40% by weight), as well as conditions which were used in firing temperatures of 950 °C. Regarding the prospect of savings in heat energy required to form the desired microstructure, the phyllite and the residue of kaolin, for having small particle sizes and constitutions mineralogical phases with the presence of fluxes, contributed to the optimization of the firing cycle.

Músico fundador de la OSUANL: Ricardo Gómez Chavarría

El desempeño destacado del maestro Ricardo Gómez Chavarría como uno de los escasos ejecutantes de la viola y como maestro de violín le abrieron múltiples facetas en sus tareas universitarias tales como maestro en la Escuela de Música y ejecutante en la Orquesta Sinfónica de la Universidad de Nuevo León.

Relatório de estágio em psicomotricidade e intervenção precoce realizado no Hospital Beatriz Ângelo e no Agrupamento Vertical Almeida Garrett

No âmbito do ramo de aprofundamento de competências profissionais, inserido no Mestrado em Reabilitação Psicomotora, surge a possibilidade de elaborar o presente relatório com base no estágio curricular realizado no Hospital Beatriz Ângelo e no Agrupamento Vertical Almeida Garrett. Este estágio incidiu na área da psicomotricidade e da intervenção precoce e possibilitou desenvolver um trabalho com crianças e respetivas famílias. As atividades de estágio foram desenvolvidas com 11 crianças entre os 18 meses e os 10 anos de idade que apresentavam diversas problemáticas e que, por influência da sua condição ou do meio envolvente, as suas aprendizagens e comportamento encontram-se comprometidos. Todavia, foram escolhidos dois casos para uma análise mais detalhada das suas características, desenvolvimento global e contexto, seguindo de uma sequência lógica de processos da prática psicomotora - observação, avaliação, elaboração de planos de intervenção/sessão e intervenção.

siRNAs sintéticos direcionados à no sintase neuronal : efeitos sobre a expressão gênica e viabilidade celular do glioma

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, Programa de Pós-Graduação em Saúde Animal, 2011.