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3 results on '"Samuel Novais"'

1. Biodiversity and ecosystem services in the Campo Rupestre: A road map for the sustainability of the hottest Brazilian biodiversity hotspot

Author

G. Wilson Fernandes, Lucas Arantes-Garcia, Milton Barbosa, Newton P.U. Barbosa, Eugênia K.L. Batista, Wallace Beiroz, Fernando M. Resende, Anna Abrahão, Emmanuel D. Almada, Elaine Alves, Natacha J. Alves, Patrícia Angrisano, Montserrat Arista, Juan Arroyo, André Jardim Arruda, Thaise de Oliveira Bahia, Laura Braga, Lílian Brito, Marcos Callisto, Dario Caminha-Paiva, Marília Carvalho, Abel Augusto Conceição, Leda N. Costa, Antonio Cruz, Jessica Cunha-Blum, John Dagevos, Braulio F.S. Dias, Victor D. Pinto, Rodolfo Dirzo, Daniel Quedes Domingos, Lívia Echternacht, Stephannie Fernandes, Jose Eugenio C. Figueira, Cecilia F. Fiorini, Ana Maria Giulietti, Augusto Gomes, Vanessa M. Gomes, Bernardo Gontijo, Fernando Goulart, Tadeu J. Guerra, Patrícia A. Junqueira, Débora Lima-Santos, Julia Marques, Joao Meira-Neto, Deise T.B. Miola, Leonor Patrícia C. Morellato, Daniel Negreiros, Elizabeth Neire, Ana Carolina Neves, Frederico S. Neves, Samuel Novais, Yumi Oki, Elizabeth Oliveira, Rafael S. Oliveira, Marco O. Pivari, Euripedes Pontes Junior, Bernardo D. Ranieri, Rodrigo Pinheiro Ribas, Aldicir Scariot, Carlos E. Schaefer, Letícia Sena, Pedro G. da Silva, Paulo R. Siqueira, Natalia C. Soares, Britaldo Soares-Filho, Ricardo Solar, Marcelo Tabarelli, Rogério Vasconcellos, Evaldo Vilela, and Fernando A.O. Silveira

Subjects
Biodiversity conservation, Bioeconomy, Global change, Mountain ecology, Policy, Rupestrian grassland, Ecology, QH540-549.5, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

Global sustainability rests on a myriad of benefits provided by natural ecosystems that support human livelihoods and well-being, from biodiversity persistence to climate regulation. The undeniable importance of conserving tropical forests has drawn most of the conservation spotlight towards it. However, open ecosystems such as the Brazilian Campo Rupestre (rupestrian grassland), have been historically overlooked despite their high diversity and key associated ecosystem services. We highlight major current threats to the persistence of the Campo Rupestre emphasizing its ecological, social, cultural, geo-environmental, and economic importance. We call attention to the importance of the Campo Rupestre as a reservoir of biodiversity and ecosystem services and offer priority actions that resulted from discussions involving scientists, industry representatives, environmental managers, and other members of civil society. Proposed actions include efforts related to ecological restoration, sustainable ecotourism, protection of traditional ecological knowledge, identification of emerging research questions, and development of tailored public policies. Such issues are integrated into a framework that collectively represents a road map to safeguard the Campo Rupestre from further degradation and steer its historical overexploitation towards sustainable management. Safeguarding the future of non-forest biomes like this poses a challenge to current paradigms of nature conservation. By establishing priorities and guidelines, we propose an actionable plan, which we hope can support informed decision-making policy towards a sustainable use of the Campo Rupestre.

Published
2020
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2. Assessment of zirconia fluorescence after treatment with immersion in liquids, glass infiltration and aging

Author

Volpato, Claudia A. M., Carvalho, Óscar Samuel Novais, Volpato, Guilherme M., Fredel, Márcio C., Silva, Filipe Samuel, Pereira, Mário R., and Universidade do Minho

Subjects
Science & Technology, Optical properties, Biomedical applications (E), ZrO2, Ciências Médicas::Biotecnologia Médica, Glass, Optical properties (C), Glass (D), ZrO (D) 2, Biomedical applications
Abstract

The aim of this study was to evaluate the fluorescence of white zirconia immersed in coloring and fluorescence liquids subjected to glass infiltration and aging. Sixty zirconia discs were machined and divided into groups. Ten discs received no treated before sintering (NT group), ten discs were immersed in a coloring liquid (A2 group), and ten discs were immersed in a fluorescent liquid (F group). The other thirty discs were infiltrated by glass after the previous treatments (NT+I, A2+I, and F+I groups). The composition of the commercial liquids was characterized by X-Ray fluorescence. Diffuse reflectance and total fluorescence were evaluated before and after the aging protocol, made in autoclave for 4 hours at 134 °C. The X-Ray fluorescence analysis found a high concentration of Fe2O3 (80.7 at%) in the composition of the coloring liquid and of Bi2O3 (54.2 at%) and Cl (45.2 at%) in the fluorescence liquid. Greater reflectance was observed in the glass infiltrated groups, in particular NT+I and F+I. Fluorescence 3D maps of the groups submitted to immersion showed a higher total fluorescence than the NT group, except for the A2 group. The F group showed the highest fluorescence, being 12.8 times greater than the NT group. The fluorescence emission occurred in the region between 350 and 550 nm after an excitation between 290 and 360 nm. Regarding aging, the presence of the glass infiltrated layer protected the samples from hydrothermal degradation., This work was supported by the Coordination for the Improvement of Higher Education Personnel, Brazil [grant number 88881.119044/2016-01] ; and the Foundation for Science and Technology, Portugal [UID/EEA/04436/2013 by FEDER funds, POCI-01-0145-FEDER-006941 NORTE 01-0145-FEDER-000018] .

Published
2021

3. Translucency, contrast ratio and fluorescence of esthetic materials

Author

Kauling, A. E. C., Volpato, C. A. M, Carvalho, Óscar Samuel Novais, Pereira, Mário R., Guth, J. F., and Universidade do Minho

Subjects
Saúde de qualidade, Esthetic materials, Ciências Médicas::Outras Ciências Médicas, Fluorescence
Abstract

This study evaluated the translucency, contrast ratio and fluorescence of resin nanoceramic and zirconia materials employed for manufacturing of the indirect restorations.

Published
2018

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