Módulos de pré-concentração miniaturizados mediante o uso da tecnologia LTCC e zeólitas.

A conjugação do binômio miniaturizaçãointegração tem permitido estabelecer a base conceitual para o desenvolvimento de uma nova geração de dispositivos miniaturizados, capazes de integrar todas as etapas necessárias para a realização de uma análise química. As cerâmicas verdes apresentam-se muito mais versáteis que qualquer dos materiais com os quais já se trabalhou até o momento no campo da miniaturização, dado que permitem a construção de dispositivos tridimensionais, de uma maneira rápida e simples. O objetivo desse trabalho é avaliar a zeólita natural como material para a construção de filtros empregados na préconcentração de fosfatos presentes na água, mediante sua integração em um dispositivo reutilizável baseado em cerâmicas verdes

Chronic mild prenatal stress exacerbates the allergen-induced airway inflammation in rats.

The effects of chronic mild prenatal stress on leukocyte infiltration into the airways was investigated in rat offspring. The chronic prenatal stress consisted of transitory and variable changes in the rat's living conditions. Offspring at adult age were actively sensitized (day 0) and intratracheally challenged (day 14) with ovalbumin. Bronchoalveolar lavage was performed in the offspring at 48 h after intratracheal challenge with ovalbumin. A significant increase in total leukocyte infiltration was observed in the non-stressed offspring group and this was associated with a marked recruitment of eosinophils without a significant effect on the influx of neutrophils and mononuclear cells. In the prenatal stressed offspring, the counts of both total leukocyte and eosinophils, as well as mononuclear cells, was increased by 50% compared to the non-stressed offspring. We provide here the first experimental evidence that chronic mild unpredictable prenatal stress produces a marked increase in the allergen-induced airway inflammation in the rat offspring

Desenvolvimento de metodologia analítica para análise de carrapaticidas em carne bovina.

A metodologia proposta mostrou-se apropriada para analisar traços de clorfenvinfos, fipronil e cipermetrina em carne bovina, a qual dispensa o uso de solventes orgânicos, além de ser rápida, sensível e seletiva

Multimode Hong-Ou-Mandel Interferometry

We review some recent experiments based upon multimode two-photon interference of photon pairs created by spontaneous parametric down-conversion. The new element provided by these experiments is the inclusion of the transverse spatial profiles of the pump, signal and idler fields. We discuss multimode Hong-Ou-Mandel interference, and show that the transverse profile of the pump beam can be manipulated in order to control two-photon interference. We present the basic theory and experimental results as well as several applications to the field of quantum information.Comment: 20 pages, 14 figures, Brief Review to be published in Modern Physics Letters

Criticality in the 2+1-dimensional compact Higgs model and fractionalized insulators

We use a novel method of computing the third moment M_3 of the action of the 2+1-dimensional compact Higgs model in the adjoint representation with q=2 to extract correlation length and specific heat exponents nu and alpha, without invoking hyperscaling. Finite-size scaling analysis of M_3 yields the ratio (1+alpha)/nu and 1/nu separately. We find that alpha and nu vary along the critical line of the theory, which however exhibits a remarkable resilience of Z_2 criticality. We propose this novel universality class to be that of the quantum phase transition from a Mott-Hubbard insulator to a charge-fractionalized insulator in two spatial dimensions.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let

The DEPURANAT project : sustainable management of wastewater in rural areas

The DEPURANATt project received co-financing from the European Union through its interregional cooperation programme, Interreg IIIB Atlantic Arc Programme. This project, coordinated by the Canary Islands Institute of Technology, allowed French, Portuguese and Spanish institutions to work together on sustainable management of wastewater in rural and protected areas. Within the framework of this project, twelve natural wastewater treatment systems have been built or adapted from pre-existing systems in Portugal, Andalusia and the Canary islands. In these systems, a shared ambitious protocol of physical-chemical and microbiological analyses was established, and several studies carried out with respect to the agronomical quality of the effluents and the physiology of the plants. These analytical campaigns also attempted to promote a positive image of these systems to, and in, the rural areas. Moreover, it is important for the target publics to value correctly the possibilities created by regenerated wastewater and vegetal biomass, and thus accept the same as integral methods which contribute to sustainable local development. Several studies relating to social integration were focused, to this end, on measuring people’s acceptance of these systems in their areas, whereas the environmental impact of the systems was determined using an adapted life cycle assessment methodology. The economic analysis of the systems focused on analysing the financial indicators, empirical cost functions, and the potential market for these technologies. Furthermore, maps of potential areas where natural wastewater treatment systems may be implemented have been created. Finally, a support tool for deciding upon the installation of conventional or natural wastewater treatment systems has been designed with the aim of informing at technicians about the most suitable technology to be applied in each situation

Parâmetros de produção e desenvolvimento vegetativo do cajueiro "EMBRAPA 51" sob diferentes níveis de irrigação.

O objetivo deste trabalho foi avaliar o comportamento produtivo e vegetativo do clone Embrapa 51, de cajueiro-anão-precoce, submetido a diferentes regimes hídricos, nas condições edafoclimáticas dos tabuleiros costeiros do Meio-Norte

Nitrous oxide fluxes in an integrated crop-livestock-forest system in Sinop-MT.

The objective of this study was to evaluate the mitigation potential of crop-livestock-forest integration system (ICLF) or monoculture forest, farming and grazing, check the seasonal differences in emissions between them and the effect of management operations of cultures on N2O fluxes