Ocean Structures
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Reavaliação do contexto tectonico dos basaltos do greenstone belt do Rio Itapicuru (Bahia), com base na geoquimica de elementos-traço / Tectonic setting of basalts from the Rio Itapicuru greenstone belt revisited (Bahia, Bazil) by trace-element geochemistry
The Paleoproterozoic Rio Itapicuru Greenstone Belt, situated in the Serrinha Block - northeast São Francisco Craton, has a sequence of basaltic rocks whose tectonic setting is under discussion, i.e whether a back arc setting or intracontinental rift. The basalt geochemistry was revisited on the basis of incompatible trace elements data, such as high field s
Publicado em: 2007
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14. Geologia do sudoeste do Estado de Goiás : Integração de dados geológicos e aerogeofísicos de alta densidade
The airborne magnetic and gamma ray spectrometry data related to the Airborne Geophysic Survey Project of the State of Goiás (Block 1) executed between 2004 and 2006 and considered of high density by the acquisition and treatment configuration, were integrated in GIS environment with the existing geologic information, in the SW Goiás region located from th
Publicado em: 2007
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15. Inicialização física em modelos de previsão de tempo e estudo de seus efeitos na partição de energia em modos verticais e horizontais nos trópicos e na América do Sul / Physical initialization in weather prediction models and study of its effects on the energy partition the vertical and horizontal modes over the tropics and South Americar
Physical initialization was developed at The Florida State University to improve rainfall forecast over tropical region by numerical weather prediction models. III this initialization procedure, observed rainfall rates are assimilated using reverse cumulus algorithms and nudging. At the end of the assimilation period - usually 24 hours - the model will be ab
Publicado em: 2002
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16. A survey of the generation of ocean waves in a test basin
At present stage the analytical design of wave tolerance for floating structures and vessels is still imperfect due to the mutually complex and nonlinear phenomena between structures and waves. Wave tolerance design is usually carried out through iterative evaluations of results from model tests in a wave basin, and this is done in order to reach a final str
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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17. Manganese oxide minerals: Crystal structures and economic and environmental significance
Manganese oxide minerals have been used for thousands of years—by the ancients for pigments and to clarify glass, and today as ores of Mn metal, catalysts, and battery material. More than 30 Mn oxide minerals occur in a wide variety of geological settings. They are major components of Mn nodules that pave huge areas of the ocean floor and bottoms of m
The National Academy of Sciences.
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18. 16S rRNA genes reveal stratified open ocean bacterioplankton populations related to the Green Non-Sulfur bacteria.
Microorganisms play an important role in the biogeochemistry of the ocean surface layer, but spatial and temporal structures in the distributions of specific bacterioplankton species are largely unexplored, with the exceptions of those organisms that can be detected by either autofluorescence or culture methods. The use of rRNA genes as genetic markers provi
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19. A novel microbial habitat in the mid-ocean ridge subseafloor
The subseafloor at the mid-ocean ridge is predicted to be an excellent microbial habitat, because there is abundant space, fluid flow, and geochemical energy in the porous, hydrothermally influenced oceanic crust. These characteristics also make it a good analog for potential subsurface extraterrestrial habitats. Subseafloor environments created by the
The National Academy of Sciences.
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20. A possible evolutionary origin for the Mn4 cluster of the photosynthetic water oxidation complex from natural MnO2 precipitates in the early ocean
The photosynthetic water oxidation complex consists of a cluster of four Mn atoms bridged by O atoms, associated with Ca2+ and Cl−, and incorporated into protein. The structure is similar in higher plants and algae, as well as in cyanobacteria of more ancient lineage, dating back more than 2.5 billion years ago on Earth. It has been proposed that the proto
National Academy of Sciences.
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21. Structure and membrane affinity of a suite of amphiphilic siderophores produced by a marine bacterium
Iron concentrations in the ocean are low enough to limit the growth of marine microorganisms, which raises questions about the molecular mechanisms these organisms use to acquire iron. Marine bacteria have been shown to produce siderophores to facilitate iron(III) uptake. We describe the structures of a suite of amphiphilic siderophores, named the amphibacti
The National Academy of Sciences.
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22. Processing Deep-Sea Particle-Rich Water Samples for Fluorescence In Situ Hybridization: Consideration of Storage Effects, Preservation, and Sonication†
Particles are often regarded as microniches of enhanced microbial production and activities in the pelagic ocean and are vehicles of vertical material transport from the euphotic zone to the deep sea. Fluorescence in situ hybridization (FISH) can be a useful tool to study the microbial community structures associated with these particles, and thus their ecol
American Society for Microbiology.