Geochemical Biomarkers
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Geochemical Investigation of Tar Balls Collected in a Brazilian Beach Using Biomarkers, Ni/V, δ13C Ratios and Ultra-High Resolution FT-ICR Mass Spectrometry
Representative tar balls collected in two distinct years (2012 and 2014) in a beach along the State of Bahia, northeastern Brazil, were geochemically characterized in order to identify correlations between them and investigate potential sources. Terpanes and steranes biomarkers (detected by gas chromatography coupled to mass spectrometry, GC-MS), carbon stab
J. Braz. Chem. Soc.. Publicado em: 2020-04
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2. CORRELAÇÕES GEOQUÍMICAS ENTRE AMOSTRAS DE PETRÓLEO DA BACIA POTIGUAR E DEFINIÇÃO DE SUAS POSSÍVEIS ROCHAS GERADORAS
Eight petroleum samples from Potiguar Basin were submitted for determination of saturated biomarkers by gas chromatography (fingerprint), liquid chromatography (saturates, aromatics, resins and asphaltenes), gas chromatography-mass spectrometry (GC-MS), nickel and vanadium by high resolution continuum source graphite furnace atomic absorption spectrometry (H
Quím. Nova. Publicado em: 2018-04
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3. DISTRIBUIÇÃO E QUANTIFICAÇÃO DE HIDROCARBONETOS EM SEDIMENTOS DO ESTUÁRIO DO RIO SERGIPE. / DISTRIBUTION AND QUANTIFICATION OF HYDROCARBONS IN SEDIMENTS OF RIVER ESTUARY SERGIPE.
A bacia Hidrográfica do Rio Sergipe está situada na região central do estado de Sergipe, no sentido oeste-leste, abrangendo 26 municípios, com uma área correspondente a 3.673 km e ocupação populacional de 1.213.607 habitantes, segundo o censo 2010 do Instituto Brasileiro de Geografia e Estatística (IBGE). Nesta região são desenvolvidas diversas ati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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4. Estudo qualitativo e quantitativo de biomarcadores ácidos e hidrocarbonetos presentes em óleos da Bacia Potiguar / Qualitative and quantitative study of acidic and hydrocarbon biomarkers of oil from the Potiguar Basin
rabalho foram sintetizados quatro biomarcadores ácidos, a saber: ácido 5b (H) colânico (2), 5a (H) homopregnânico (4), 8,13-tetraidrocopálico (6) e 15-isocopálico (7). Para tanto, foram utilizadas matérias primas comerciais (ácido litocólico e estigmasterol) e o ácido copálico (extraído e purificado a partir de bálsamo de copaíba). Também foi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2011
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5. Geoquímica orgânica aplicada à formação Irati, área de Herval, Rio Grande do Sul (RS), bacia do Paraná / Organic geochemistry applied to Irati formation, Herval area of Rio Grande do Sul, Paraná basin
The current research had the main focus on the geochemical study of a borehole in the Parana Basin at Herval city (RS), aiming to fill some gaps in the organic geochemistry of the Irati Formation. Ten chemical-stratigraphic units were defined from analytical data of Total Organic Carbon (TOC), total sulfur, insoluble residue, gamma-rays, isotopes of organic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/05/2011
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6. Study of Polychaeta associations in Santos Bay and Adjacent Continental Shelf (SP, Brazil) and their interrelations with physical and geochemical patterns / Estudo das associações de anelídeos Polychaeta da Baía de Santos e Plataforma Continental Adjacente (SP, Brasil) e suas interrelações com parâmetros físicos e geoquímicos estruturadores
The aim of the present work was to verify the spacial and vertical Polychaeta distribution in sediment samples of Santos Bay and adjacent continental shelf by analyzing physicochemical characteristics, granulometric pattern, chemical compounds concentration and metallic elements. Parallely, it looked for determining the organic matter origin by C/N/S content
Publicado em: 2008
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7. "Marcadores orgânicos geoquímicos em testemunhos de sedimento do Sistema Estuarino de Santos e São Vicente, SP: um registro histórico da introdução de hidrocarbonetos no ambiente marinho" / Geochemical organic markers in sediment cores of the Santos-São Vicente Estuary, SP: a historical register of the introduction of hydrocarbons in the marine environment
Estuarine areas are environments between land and ocean, where human activities are intensively developed. The Santos and São Vicente Estuary, located on the central portion of the coast of São Paulo state, has one of the most important industrial areas of Brazil. The increasing of urbanization and industrialization near the margins of Estuary, in the 50
Publicado em: 2005
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8. Estudo geoquimico de oleos do Campo de Marlim, Bacia de Campos, sintese de biomarcadores esteranos aromaticos
This thesis presents the geochemical study of three oil samples: PCM1, PCM2 e PCM3, all pertaining to the Marlin Field located in the Campos Basin, Rio de Janeiro and were generated by saline lacustrine source rocks. The crude oils were studied by the gas chromatography coupled whith mass spectrometry (GC/MS technique), and standards were used in this resear
Publicado em: 2003
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9. Biomarker Evidence for Widespread Anaerobic Methane Oxidation in Mediterranean Sediments by a Consortium of Methanogenic Archaea and Bacteria†
Although abundant geochemical data indicate that anaerobic methane oxidation occurs in marine sediments, the linkage to specific microorganisms remains unclear. In order to examine processes of methane consumption and oxidation, sediment samples from mud volcanoes at two distinct sites on the Mediterranean Ridge were collected via the submersible Nautile. Ge
American Society for Microbiology.
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10. Oxygen isotope ratios of PO4: An inorganic indicator of enzymatic activity and P metabolism and a new biomarker in the search for life
The distinctive relations between biological activity and isotopic effect recorded in biomarkers (e.g., carbon and sulfur isotope ratios) have allowed scientists to suggest that life originated on this planet nearly 3.8 billion years ago. The existence of life on other planets may be similarly identified by geochemical biomarkers, including the oxygen i
The National Academy of Sciences.
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11. Multiple archaeal groups mediate methane oxidation in anoxic cold seep sediments
No microorganism capable of anaerobic growth on methane as the sole carbon source has yet been cultivated. Consequently, information about these microbes has been inferred from geochemical and microbiological observations of field samples. Stable isotope analysis of lipid biomarkers and rRNA gene surveys have implicated specific microbes in the anaerobic oxi
The National Academy of Sciences.