Antarctic Regions
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine mammals in the La Plata River Basin
Abstract The humpback whale (Megaptera novaeangliae) is distributed among most oceans and seas of the globe (except Mediterranean Sea). These whales migrate from feeding regions in the Antarctic waters to breeding areas in tropical and subtropical seas. Here we report the stranding of a female young humpback whale, which was founded dead in the vicinity of t
Pap. Avulsos Zool.. Publicado em: 19/03/2018
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2. Subspecies of Hypolepis rugosula (Dennstaedtiaceae; Pteridophyta) around the world: morphological and biogeographic perspectives
The "Hypolepis rugosula complex" has been the subject of great debate among pteridologists: some have considered H. rugosula a single subcosmopolitan (or circum-Antarctic) species, whereas others have considered it a species-complex, encompassing several species. In the 1920s and 1930s, four geographically distinct varietiesof H. rugosula were recognized. In
Acta Bot. Bras.. Publicado em: 2014-06
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3. Caracterização potenciométrica de substâncias húmicas extraídas de solos da Antártica Marítima
Monitoring of soil carbon storage may indicate possible effects of climate change on the terrestrial environment and it is therefore necessary to understand the influence of redox potential and chemical characteristics of humic substances (HS) of Antarctic soil. Five soils from King George Island were used. HS were extracted, quantified and characterized by
Quím. Nova. Publicado em: 2013
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4. Vigilância epidemiológica do vírus da doença de Newcastle em aves domésticas e selvagens pelo método de Real Time PCR. / Surveilance of Newcastle disease virus in domestics and wild birds by Real Time PCR.
Brazilian chicken meat exports ended 2007 with shipments of 3,3 million tons, which represented a 21% increase in comparison with 2006. These results were the best in the history of the poultry sector in Brazil. The production reached 10.2 million tons, a result that kept the country as the worlds largest chicken meat exporter and the third largest producer,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/06/2009
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5. Degradação de naftaleno, fenantreno e benzo(a)pireno em solos e sedimentos de ambientes costeiros, oceânicos e antárticos / Degradation of naphthalene, phenanthrene e benzo(a)pyrene in soil and sediments of coastal, oceanic and Antarctic environments
Petroleum is the main source of fuel, and the operations of exploration, transportation, refining and distribution are potential sources of environmental pollution. In contaminated environments, the degradation of PAHs (Polycyclic Aromatic Hydrocarbons) depends on climatic factors, soil and microbial population. This study aimed to assess the potential for d
Publicado em: 2008
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6. Influência do gelo marinho antártico no setor austral sudoeste do Atlântico Sul / The influence of antactic sea ice in the austral and southwest sector on the south atlantic
In this work the interaction between Antarctic sea-ice and the South Atlantic ocean (austral and southwestern sectors) is investigated. To accomplish this satellite-observed sea-ice concentration (SIC) and a coupled model from NCAR-CCSM3 (National Center for Atmospheric Research - Community Climate System Model version 3) were employed. Three 150-year simula
Publicado em: 2007
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7. AS AVES PROCELLARIIFORMES DO BRASIL: CATÁLOGO, DISTRIBUIÇÃO GEOGRÁFICA E PADRÃO SAZONAL DAS OCORRÊNCIAS.
A systematic catalogue of Procellariiformes confirmed to Brazil, based on extensive literature surveys and studies of museum specimens, is presented. The patterns of geographical distribution and seasonality of occurrences of these birds along the Brazilian seas are also described. The Brazilian Procellariiformes includes (1) birds from the North Hemisphere,
Publicado em: 2006
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8. Analyses of the satellite sounding data assimilation process and the impact on weather forecast using a physical-space statistical analysis system. / Análise do procedimento de assimilação de sondagens derivadas de satélites e de seu impacto na previsão de tempo utilizando um sistema estátístico em espaço físico
Many studies on evaluation of the impact of satellite sounding on forecasts, made by different institutions around the World, have shown that this kind of data are very important to improve the quality of weather forecasting in Southern Hemisphere. There are many methods of data assimilation and models of weather forecasting. In this study we used an adaptat
Publicado em: 2003
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9. Analyses of the vorticity, heat and moisture budgets in the CPTEC/COLA global model for weather forecasts / Análise dos balanços de vorticidade, calor e umidade no modelo global do CPTEC/COLA para previsão de tempo
Balanços de vorticidade, calor e umidade em grande escala, para fenômenos meteorológicos, tais como: Zona de Convergência do Atlântico Sul (ZCAS) e Alta da Bolívia (AB), Ciclogêneses e Sistemas Frontais, El Niño e La Niña são obtidos a partir das análises do National Centers for Environmental Prediction (NCEP). Os termos das equações são analis
Publicado em: 2000
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10. Relationship between the Heat Tolerance of Photosynthesis and the Thermal Stability of Rubisco Activase in Plants from Contrasting Thermal Environments1
Inhibition of net photosynthesis (Pn) by moderate heat stress has been attributed to an inability of Rubisco activase to maintain Rubisco in an active form. To examine this proposal, the temperature response of Pn, Rubisco activation, chlorophyll fluorescence, and the activities of Rubisco and Rubisco activase were examined in species from contrasting enviro
American Society of Plant Biologists.
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11. Structure, function and molecular adaptations of haemoglobins of the polar cartilaginous fish Bathyraja eatonii and Raja hyperborea
Cartilaginous fish are very ancient organisms. In the Antarctic sea, the modern chondrichthyan genera are poorly represented, with only three species of sharks and eight species of skates; the paucity of chondrichthyans is probably an ecological consequence of unusual trophic or habitat conditions in the Southern Ocean. In the Arctic, there are 26 species be
Portland Press Ltd..
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12. Nonequilibrium air clathrate hydrates in Antarctic ice: a paleopiezomdter for polar ice caps.
"Craigite," the mixed-air clathrate hydrate found in polar ice caps below the depth of air-bubble stability, is a clathrate mixed crystal of approximate composition (N2O2).6H2O. Recent observations on the Byrd Station Antarctic core show that the air hydrate is present at a depth of 727 m, well above the predicted depth for the onset of hydrate stability. We