Sediment Deposit
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Caracterização tafonômica das concentrações fossilíferas da Formação Cape Melville, Grupo Moby Dick (Mioceno Inferior), Ilha Rei George, Antártica / Taphonomic characterization of fossil concentrations from the Cape Melville Formation, Moby Dick Group (Early Miocene), King Georg Island, Antactica
Works focusing on the taphonomy of fossil concentrations generated in glacial or periglacial environment are rare. In this context, the present dissertation carried out the taphonomic characterization of the fossil concentrations of the Cape Melville Formation, Moby Dick Group (Lower Miocene), King George Island, Antarctica, in order to elucidate the genesis
Publicado em: 2007
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14. Morphological description and phylogenetic position of new anuran (lissamphibia, Tetrapoda) from Continental Upper Cretaceous of Brazil (Adamantina Formation, Bauru Basin) of the municipality of Marília (SP) / "Descrição morfológica e posição filogenética de um anuro novo (Lissamphibia, Tetrapoda) do Cretáceo Superior Continental do Brasil (Formação Adamantina, Bacia Bauru) do Município de Marília, (SP)"
The fossil record of mesozoic anurans is rare in most sedimentary basins worldwide. In South America, these records are even more scarce, particularly in Brazil. Among the findings of this group in Brazilian basins, there are records of Arariphrynus placidoi (Leal and Brito 2006), from the Lower Cretaceous of the Araripe Basin and Baurubatrachus pricei Báez
Publicado em: 2006
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15. EFEITOS DO PETRÓLEO SOBRE A ASSOCIAÇÃO DE MACROINVERTEBRADOS BENTÔNICOS DE PRAIAS ARENOSAS DO EXTREMO SUL DO BRASIL.
The benthic marine organisms in the sand beach intertidal zone have a great ecological complexity, being a major trophic link among the phytoplankton, organic detritus and the higher trophic levels. Any anthropogenic disturbance that affects these organisms, such as an oil spill can cause changes in all trophic levels of coastal communities. Due to their sed
Publicado em: 2005
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16. DistribuiÃÃo espaÃo-temporal da meiofauna e da nematofauna no ecossistema recifal de Porto de Galinhas, Ipojuca, Pernambuco, Brasil
From all the beaches on Pernambuco coast âPorto de Galinhasâ is the one which receives the largest tourist flow. The aims of this research were to evaluate the meiofauna and nematofauna spatial and temporal distributions in tidal ponds as well as in the inner part of the reef ecosystem. To evaluate the vertical distribution of meiofauna and Nematoda genera
Publicado em: 2003
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17. Estudo geológico e geofísico da falha de carnaubais, Bacia Potiguar-RN, e implicações neotectônicas
The segment of Carnaubais Fault located in the southeasthern portion of Guamaré Graben (Potiguar Basin) was studied. Several structures were detected and some of them strongly suggest that the last movements in Carnaubais Fault are of Neotectonic age. The study comprises an integrated interpretation of geologic, geomorphologic and geophysical data (gravimet
Publicado em: 1998
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18. Geoquimica e impacto ambiental do arsenio no Vale do Ribeira (SP-PR)
The sedimentary and volcanic rocks of the Ribeira Valley, in the Apiaf FoId Belt, host a variety of PbZn deposits, which were formed by singenetic (Perau-type) and epigenetic (Panelas-type) models. Long-term mining activities originated a toxic contamination by arsenic in the stream sediments of the Ribeira de Iguape river that drains the region. The purpose
Publicado em: 1997
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19. Heterotrophic Potentials and Hydrocarbon Biodegradation Potentials of Sediment Microorganisms Within the Athabasca Oil Sands Deposit
Techniques for the enumeration and the determination of the potential activity of disturbed sediment mixed populations at control sites and sites within the Athabasca oil sands formation were applied to August and December samples. These techniques included the determination of general heterotrophic potential for the assimilation and respiration of glutamate
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20. Radiocarbon dates on bones of extinct birds from Hawaii.
Bones from a stratified sedimentary deposit in the Puu Naio Cave site on Maui, Hawaiian Islands, reveal the late Holocene extinction of 19 species of birds. The age of the sediment and associated fauna was determined by direct radiocarbon dating (tandem particle accelerator-mass spectrometer; TAMS) of amino acids extracted from bones weighing as little as 45
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21. Bacterial diversity in a deep-subsurface clay environment.
The presence of bacteria in a deep clay sediment was analyzed in a 20-m-long core horizontally drilled from a mine gallery at a depth of 224 m in the Boom clay formation (Mol, Belgium). This clay deposit is the result of a marine sedimentary process that occurred 35 million years ago. Bacterial activities were estimated by measuring respiration on [14C]gluco
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22. Gentamicin Nephrotoxicity: Failure of Three Cephalosporins to Potentiate Injury in Rats
The possibility that gentamicin and cephalosporin antibiotics may act synergistically to produce nephrotoxicity was evaluated in an experimental model. Necrosis of the proximal tubules occurred when rats were treated with 60 to 120 mg/kg of gentamicin for 5 days but not when 15 to 20 mg/kg per day was given for up to 4 weeks. In all gentamicin-treated animal
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23. Southern Peru desert shattered by the great 2001 earthquake: Implications for paleoseismic and paleo-El Niño–Southern Oscillation records
In the desert region around the coastal city of Ilo, the great southern Peru earthquake of June 23, 2001 (8.2–8.4 moment magnitude), produced intense and widespread ground-failure effects. These effects included abundant landslides, pervasive ground cracking, microfracturing of surficial hillslope materials, collapse of drainage banks over long stretches,
National Academy of Sciences.
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24. In Vitro Microbial Degradation of Bituminous Hydrocarbons and In Situ Colonization of Bitumen Surfaces Within the Athabasca Oil Sands Deposit
Bituminous hydrocarbons extracted from the Athabasca oil sands of north-eastern Alberta were adsorbed onto filter supports and placed at sites in the Athabasca River and its tributaries where these rivers come in contact with the oil sands formation. Colonization of the hydrocarbon surfaces at summer and winter ambient temperatures was examined by scanning a