Avaliação sensorial de variedades de mandioca de mesa com raízes de cores diversas.

Este trabalho teve como objetivo avaliar a aceitabilidade de uma cultivar de raiz de cor amarela provavelmente com maior teor de carotenóides, através de teste sensorial em escala hedônica, por consumidores que têm preferência cultural por mandioca de mesa de raiz com cor variando de branca a creme

Vacuum Polarization in the Spacetime of a Scalar-Tensor Cosmic String

We study the vacuum polarization effect in the spacetime generated by a magnetic flux cosmic string in the framework of a scalar-tensor gravity. The vacuum expectation values of the energy-momentum tensor of a conformally coupled scalar field are calculated. The dilaton's contribution to the vacuum polarization effect is shown explicitly.Comment: 11 pages, LATEX file, 2 eps figure

Present status of controversies regarding the thermal Casimir force

It is well known that, beginning in 2000, the behavior of the thermal correction to the Casimir force between real metals has been hotly debated. As was shown by several research groups, the Lifshitz theory, which provides the theoretical foundation for the calculation of both the van der Waals and Casimir forces, leads to different results depending on the model of metal conductivity used. To resolve these controversies, the theoretical considerations based on the principles of thermodynamics and new experimental tests were invoked. We analyze the present status of the problem (in particular, the advantages and disadvantages of the approaches based on the surface impedance and on the Drude model dielectric function) using rigorous analytical calculations of the entropy of a fluctuating field. We also discuss the results of a new precise experiment on the determination of the Casimir pressure between two parallel plates by means of a micromechanical torsional oscillator.Comment: 14 pages, 1 figure, iopart.cls is used, to appear in J. Phys. A (special issue: Proceedings of QFEXT05, Barcelona, Sept. 5-9, 2005

Comparação entre protocolos de extração de DNA para Ramularia areola.

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Influence of açai fruits (Euterpe oleracea Mart.) conservation on the acceptance of açai drink.

The açai drink is consumed habitually by populations of northern Brazil, but one of the major bottlenecks in the production of this drink is the seasonality of fruit production. Hence the needs to study the influence of cold storage on the transport of fruits from distant locations, such as the archipelago of Bailique (AP, Brazil) until the consumer centers. In this context, fruits collected and packaged under refrigeration and room temperatures were transported by boat for twelve hours and were subsequently processed in a mixer. Sensory analysis was performed in two consecutive days and the samples were stored under refrigeration. This analysis was performed by affective method with global acceptance (n=54) and the samples presented in a balanced way. It was used a hedonic scale with 9 points, ranging from like extremely (9) to dislike extremely (1). The results show that cold storage of the fruits affected significantly (p=0.002467) the acceptance of beverages in both two days of sensory evaluation. On the first day, the drink originated from fruits transported at cold storage received note 8 (liked a lot), while the drink from fruits at room temperature reached grade 7 (like moderately). On the second day of evaluation, the drink from refrigerated fruits received note 7 (like moderately) and drink from fruits stored at room temperature obtained note 5 (indifferent). Considering the type of preservation of fruits, no sensory difference was detected between the drinks from refrigerated fruits served on the two consecutive days, as well as no significant difference in drink of fruits transported at room temperature in this same period. It was concluded that açai fruits collected in regions distant from the consumer center, but kept under refrigeration, produce a drink with a considerable acceptance level, and they could be an alternative for supply of raw material during the off season.Resumo P1.5.010

Características fisico-químicas de frutos de taperebá (Spondia mombin L.) coletados em área de ocorrência de mosca-das-frutas

Este trabalho teve por objetivo avaliar as características físico-químicas de frutos de taperebá a partir de amostras coletadas em dois pontos distintos no município de Mazagão (AP), local reconhecidamente de ocorrência de moscas-das-frutas