Antarctica
Mostrando 1-12 de 194 artigos, teses e dissertações.
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1. HSCCC Separations of Rutin Esters Obtained by Enzymatic Reaction Catalyzed by Lipase
The flavonoid rutin presents several pharmacological effects, despite this, its application in the pharmaceutical industry can be significantly limited by its low bioavailability. The development of lipophilic derivatives by esterification of hydroxyl groups with fatty acid chains may be an effective strategy to change their physicochemical properties. This
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. 180 years of Botanical Investigations in Antarctica and the Role of Brazil
ABSTRACT Botany is one of the oldest sciences done above the 60oS parallel with more than 180 years passing since the first professional botanist collected plants in Antarctica. Far from being a barren place, plants constitute an important part of polar ecosystems. Brazil is one of only 29 countries in the world with consultative status and to currently d
Acta Bot. Bras.. Publicado em: 2020-06
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3. Pterodactyloid pterosaur bones from Cretaceous deposits of the Antarctic Peninsula
Abstract Fossil vertebrates from Antarctica are considerably rare, hampering our understanding of the evolutionary history of the biota from that continent. For several austral summers, the PALEOANTAR project has been carrying out fieldwork in the Antarctic Peninsula in search for fossils, particularly Cretaceous vertebrates. Among the specimens recovered so
An. Acad. Bras. Ciênc.. Publicado em: 02/12/2019
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4. ANTARCTICA AND ABNJ IN THE ANTHROPOCENE: CHALLENGES TO THE SUSTAINABLE MANAGEMENT OF MARINE GENETIC RESOURCES?
Resumo A época do Antropoceno traz novos desafios relacionados à tecnologia para o manejo sustentável da biodiversidade, incluindo o acesso a recursos genéticos marinhos. Embora separados em duas agendas multilaterais, a Antártica e as áreas fora da jurisdição nacional são casos comparáveis, uma vez que a regulação das atividades de bioprospecç�
Ambient. soc.. Publicado em: 25/11/2019
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5. Mapeamento de Estressores no Trabalho de Expedicionários do Programa Antártico Brasileiro (PROANTAR)
RESUMO O programa Antártico Brasileiro (PROANTAR) realiza expedições à Antártica, onde militares e civis são expostos a estressores. A presente pesquisa mapeou os estressores ambientais, ocupacionais e interpessoais percebidos por participantes do PROANTAR. Uma amostra de 38 pessoas, separadas em dois grupos, foi avaliada no início e final de uma expe
Psic.: Teor. e Pesq.. Publicado em: 28/10/2019
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6. Physicochemical Study of the Interaction between Gold Nanoparticles and Lipase from Candida sp. (CALB): Insights into the Nano-Bio Interface
The surface interactions between gold nanoparticles (AuNPs) and lipase from Candida antarctica fraction B (CALB) were investigated at macromolecular and colloidal length-scales. In order to elucidate the reciprocal effect of the interactions on the individual component’s properties, CALB was either added during the synthesis of AuNPs or added to pre-synthe
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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7. Policy networks in global environmental governance: connecting the Blue Amazon to Antarctica and the Biodiversity Beyond National Jurisdiction (BBNJ) agendas
Abstract Focusing on the domestic policy network around the Blue Amazon paradigm, this article challenges the frequently presented argument of Brazil as a key player in global environmental governance. In doing so, it applies a policy network approach to study the institutional framework that structures the country’s engagement in relation to the Antarctic
Rev. bras. polít. int.. Publicado em: 12/09/2019
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8. High-resolution topography for Digital Terrain Model (DTM) in Keller Peninsula, Maritime Antarctica
Abstract High resolution topography (HRT) surveys is an important tool to model landscapes, especially in zones subjected to strong environmental changes, such as Antarctica, where landform is highly influenced by cryoclasty and permafrost melting. The aim of this work was to obtain a high accurate DTM for Keller Peninsula, Maritime Antarctica. The survey st
An. Acad. Bras. Ciênc.. Publicado em: 26/07/2018
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9. A methodological proposal for the recovery of palynomorphs from snow and ice samples
ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in r
Acta Bot. Bras.. Publicado em: 09/04/2018
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10. Environmental Correlation and Spatial Autocorrelation of Soil Properties in Keller Peninsula, Maritime Antarctica
ABSTRACT: The pattern of variation in soil and landform properties in relation to environmental covariates are closely related to soil type distribution. The aim of this study was to apply digital soil mapping techniques to analysis of the pattern of soil property variation in relation to environmental covariates under periglacial conditions at Keller Penins
Rev. Bras. Ciênc. Solo. Publicado em: 08/01/2018
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11. Comparative genome-wide polymorphic microsatellite markers in Antarctic penguins through next generation sequencing
Abstract Microsatellites are valuable molecular markers for evolutionary and ecological studies. Next generation sequencing is responsible for the increasing number of microsatellites for non-model species. Penguins of the Pygoscelis genus are comprised of three species: Adélie (P. adeliae), Chinstrap (P. antarcticus) and Gentoo penguin (P. papua), all dist
Genet. Mol. Biol.. Publicado em: 2017-09
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12. Occurrence of arbuscular mycorrhizal fungi on King George Island, South Shetland Islands, Antarctica
ABSTRACT Arbuscular mycorrhizal fungi make up an important ecological niche in ecosystems, and knowledge of their diversity in extreme environments is still incipient. The objective of this work was to evaluate the density and diversity of arbuscular mycorrhizal fungi in the soil of King George Island in the South Shetland Islands archipelago, Antarctica. Fo
An. Acad. Bras. Ciênc.. Publicado em: 17/08/2017