Mariana Viana - Independent Researcher (original) (raw)

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Books by Mariana Viana

by leonor hungria, Eduarda Novo, Mariana Viana, Daniel Cruz Brandão, Joana Costa, Dária Salgado, Marta López, Birgitta Hosea, Glória Maria Lourenço Bastos, Vitor Carvalho, Manuela Rocha, Marta Alexandra Cruz Madureira, Tiago Rodrigues, Rita Carvalho, Stuart Medley, Paula Tavares, Blanca Lopez, sahra kunz, Manuel Albino, Daniel Silvestre, María Carmen Lorenzo Hernández, Eduardo Faria, Jorge Teixeira Marques, Jason Kennedy, Isabel Trigueiros, Miquel Alcaraz, Adriana Navarro-Álvarez, Eliane Gordeeff, Susan Hagan, Catarina Silva, and Jorge Pereira

Papers by Mariana Viana

PLoS ONE, 2012

Several approaches have been proposed to assess impacts on natural assemblages. Ideally, the pote... more Several approaches have been proposed to assess impacts on natural assemblages. Ideally, the potentially impacted site and multiple reference sites are sampled through time, before and after the impact. Often, however, the lack of information regarding the potential overall impact, the lack of knowledge about the environment in many regions worldwide, budgets constraints and the increasing dimensions of human activities compromise the reliability of the impact assessment. We evaluated the impact, if any, and its extent of a nuclear power plant effluent on sessile epibiota assemblages using a suitable and feasible sampling design with no 'before' data and budget and logistic constraints. Assemblages were sampled at multiple times and at increasing distances from the point of the discharge of the effluent. There was a clear and localized effect of the power plant effluent (up to 100 m from the point of the discharge). However, depending on the time of the year, the impact reaches up to 600 m. We found a significantly lower richness of taxa in the Effluent site when compared to other sites. Furthermore, at all times, the variability of assemblages near the discharge was also smaller than in other sites. Although the sampling design used here (in particular the number of replicates) did not allow an unambiguously evaluation of the full extent of the impact in relation to its intensity and temporal variability, the multiple temporal and spatial scales used allowed the detection of some differences in the intensity of the impact, depending on the time of sampling. Our findings greatly contribute to increase the knowledge on the effects of multiple stressors caused by the effluent of a power plant and also have important implications for management strategies and conservation ecology, in general.

Infrared Imaging for Breast Cancer Detection with Proper Selection of Properties: From Acquisition Protocol to Numerical Simulation

222. Molecular Mechanisms Involved in PGE2 Release Induced by the Snake Venom Metalloproteinase BaP1 in Synoviocytes

Toxicon, 2012

Combining approaches for early diagnosis of breast diseases using thermal imaging

International Journal of Innovative Computing and Applications, 2012

ABSTRACT This paper presents a combination of efforts on the construction of a tool to help in th... more ABSTRACT This paper presents a combination of efforts on the construction of a tool to help in the diagnosis by infrared breast images. It considers from the basic problem of image acquisition and storage in a database to the automatic extraction of the region of interest of each breast (left and right), the feature extraction, the decision and the limits of the diagno- sis as well. The main objective of this study is the analysis of the viability of the use of the IR images for automatic detection of pathologies by texture symmetric analysis. Moreover numerical simulations and experimentations are developed in order to analyse the relation between the internal temperature of the breast and the temperature on the breast surface during the image acquisition.