Marine Sediments
Mostrando 13-24 de 271 artigos, teses e dissertações.
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13. Marcadores orgânicos moleculares como ferramentas no monitoramento ambiental: Avaliação da distribuição de Alquilbenzeno Lineares (LABs) em organismos e sedimentos, como indicativo de exposição ao esgoto em áreas costeiras / Organic molecular markers as tools in environmental monitoring: Evaluation of Linear Alkylbenzene (LABs) distribution in organisms and sediments, as indicative of exposure to sewage in coastal areas
The sewage disposal in coastal areas can cause impacts to marine life, altering the balance of the ecosystem and biodiversity and causing serious diseases in humans. In this study, the concentration of a set of molecular markers for the introduction of organic sewage into the marine environment: linear alkylbenzene (LAB), in samples of sediment, oysters (Cra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2012
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14. Biogeografia e sistemática dos peixes aulopiformes / Biogeography and systematics of aulopiformes fishes
The Aulopiformes are marine fishes ranging from Early Cretaceous to Recent. Fossil taxa are found in sediments from South and North America, Europe, Asia and Africa. The living forms can be found from shallow coastal estuaries, to the abyssal depths, exceeding 3,000 m. Interrelationships among this group are subject of many studies. The aim of these studies
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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15. The diversity, extracellular enzymatic activities and photoprotective compounds of yeasts isolated in Antarctica
The diversity of yeasts collected from different sites in Antarctica (Admiralty Bay, King George Island and Port Foster Bay and Deception Island) and their ability to produce extracellular enzymes and mycosporines were studied. Samples were collected during the austral summer season, between November 2006 and January 2007, from the rhizosphere of Deschampsia
Brazilian Journal of Microbiology. Publicado em: 2011-09
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16. Rb-Sr systematics of holocene pelitic sediments and their bearing on whole-rock dating
In many cases, when dealing with argillaceous fine-grained sedimentary rocks, the isotopic ages obtained from Rb–Sr whole-rock isochron calculations are of geological significance, despite the fact that the initial conditions of Sr isotopic homogenization are not fulfilled. To explain this, a mechanical mixing during deposition has been suggested, leading
Publicado em: 2011
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17. Capacidade de oxidação como índice de estabilidade da matéria orgânica de sedimentos de acordo com gradiente fluvial-estuarino do rio Paraíba do Sul
The hummus composition and it redox properties have been used to evaluate the organic matter quality from natural systems. The objectives of this study were the fractionation of the organic matter and the determination of the oxidation capacity of humic acids to evaluate the organic matter quality of sediments from a gradient fluvial-estuarine in the Brazili
Química Nova. Publicado em: 2011
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18. Assembléias de diatomáceas em sedimentos holocênicos no estremo sul do Brasil : reconstruções paleoambientais
This paper describes the diatom assemblages present in a sediment profile in the Lagoa do Peixe, Middle Littoral of Rio Grande do Sul, in order to make the palaeoenvironmental reconstruction and identify periods of increased marine influence and hydrodynamics, as a consequence of changes sea level occurred during the Holocene. The drill core T09 was selected
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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19. Structural evolution and tectonic setting of the Porongos belt, southern Brazil
The SW–NE-striking Porongos belt, located between juvenile Neoproterozoic rocks in the west and the Dom Feliciano belt, characterized by intense reworking of older crust, in the east, comprises a greenschist to amphibolite-facies metavolcano-metasedimentary succession (Porongos sequence) of unknown age with some exposures of Palaeoproterozoic gneisses (Enc
Publicado em: 2011
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20. Levantamento dos níveis de radioatividade natural em águas do alto Vale do Ribeira à planície costeira do litoral sul do Estado de São Paulo / Assessment of natural radioctivity levels in waters from Higher Ribeira Valley until the southern Sao Paulo State coastal plain
The complex exchange of fluvial, subsurface and seawater within a coastal area directly affects global biogeochemical cycles and the application of isotopic tracers, mainly natural radionuclides from U and Th series, is a powerful tool to track sources and sinks of trace elements and nutrients to this systems. The unique Ra signature applied to quantify the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2010
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21. Estudo dos processos sedimentológicos na Margem Continental Sudeste do Brasil pelo uso de radionuclídeos naturais / Study of thesedimentological process in the Shelf and Upper Slope off Southeast Brazil throught the use of natural radionuclides
A Oceanografia, recentemente, vem fazendo uso dos mais diferentes radionuclídeos os quais funcionam como traçadores e auxiliam em uma maior compreensão dos processos de dinâmica oceânica, movimentação e deposição do fundo marinho. No Brasil, porém, há pouca informação a respeito dos teores de radionuclídeos naturais para a região costeira e oc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/11/2010
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22. Sedimentology, stable isotopes and palinology of quaternary deposits from eastern of Marajó Island, Pará State / Sedimentologia, isótopos estáveis e palinologia de depósitos quaternários no leste da Ilha do Marajó, Estado do Pará
Analysis of Quaternary sediments in Amazonia is of great interest for reconstructing the dynamic evolution of its drainage basin, and to support discussions related to paleoclimate, sea level and tectonics. Few studies emphasize this type of approach, which is mainly due to lack of natural exposures due to the low topography of the area. This work integrates
Publicado em: 2010
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23. Argilominerais em solos de manguezais da costa brasileira / Clay minerals in mangrove soils of Brazilian coast
Mangroves are transitional ecosytems between continental and marine environments. Its widely distributed along Brazilian coast under great variability of climatic, oceanographic, geological and geomorphological conditions. Its soil mineralogy has a relevant role in the pedogenic processes and biogeochemical behavior of nutrients and potential inorganic and o
Publicado em: 2010
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24. Primera ictiofauna marina del Cretácico Superior (Formación Jaguel, Maastrichtiano) de la provincia de Río Negro, Argentina
This paper describes several fossil teeth coming from marine sediments from the Bajo Trapalcó locality, Río Negro province, Patagonia, Argentina. The ichthyofauna described here is composed by six different chondrichtyan taxa (Serratolamna serrata, Squalicorax pristodontus, Cretalamna appendiculata, Carcharias sp., Odontaspis sp. and cf. Pseudohypolophus m
Papéis Avulsos de Zoologia (São Paulo). Publicado em: 2010