Evidence for euphotic zone anoxia during the deposition of Aptian source rocks based on aryl isoprenoids in petroleum, Sergipe-Alagoas Basin, northeastern Brazil

Four crude oil samples from the Sergipe-Alagoas Basin, northeastern Brazil, were analyzed using full scan gas chromatography-quadrupole mass spectrometry (GC-qMS) for biomarkers, in order to correlate them using aromatic carotenoids thereby enhancing knowledge about the depositional environment of their source rocks. The geochemical parameters derived from saturated fractions of the oils show evidence of little or no biodegradation and similar thermal maturation (Ts/(Ts+Tm) for terpanes, C29 αββ/(αββ+ααα), C27, and C29 20S/(20S+20R) for steranes). Low pristane/phytane ratios and the abundance of gammacerane and β-carotane are indicative of an anoxic and saline depositional environment for the source rocks. Moreover, we identified a large range of diagenetic and catagenetic products of the aromatic carotenoid isorenieratene, including C40, C33, and C32 diaryl isoprenoids and aryl isoprenoid derivatives with short side chains and/or additional rings. These results indicate anoxia in the photic zone during the deposition of the source rocks. © 2013 The Authors.

Structure, characterization and near-infrared emission of a novel 6-connected uninodal 3D network of Nd(III) containing 2,5-thiophenedicarboxylate anion

The novel coordination polymer with the formula {[Nd2(2,5-tdc)3(dmf)2(H2O)2].dmf.H2O}n (2,5-tdc2-=2,5-thiophedicarboxylate anion and dmf=dimethylformamide) has been synthesized and characterized by thermal analysis (TG/DTA), vibrational spectroscopy (FTIR) and single crystal X-ray diffraction analysis (XRD). Structure analysis reveals that Nd(III) ions show dicapped trigonal prism coordination geometry. The 2,5-tdc2- ligands connect four Nd(III) centers, adopting (κ1 - κ1) - (κ1 - κ1) - μ4 coordination mode, generating an interesting 6-connected uninodal 3D network. Photophysical properties were studied using diffuse reflectance spectroscopy (DR) and excitation/emission spectra. The photoluminescence data show the near infrared emission (NIR) with the characteristic 4F3/2→4IJ (J=9/2, 11/2 and 13/2) transitions of Nd(III) ion, indicating that 2,5-tdc2- is able to act as a sensitizer for emission in NIR region. © 2013 Elsevier B.V.

Informe del Seminario sobre el Papel del Sector Minero-Metalúrgico en el Proceso del Desarrollo de América Latina y el Caribe

Presenta la asistencia, organización de los trabajos y resumen de las exposiciones y debates sobre los temas: dependencia minero-metalúrgica y desarrollo económico; el sector minero-metalúrgico y el entorno económico internacional; las modalidades del desarrollo minero en la región; el marco institucional y jurídico; marco analítico para planificar y analizar el sector minero-metalúrgico.

Alternativas campesinas para la comercialización de productos agrícolas en México

Analiza diferentes alternativas de participación campesina en la comercialización de sus productos, de tal forma de poder proponer una serie de recomendaciones para viabilizar el diseño y ejecución de instrumentos de política económica enfocados al sector rural.

Análise teórica e experimental do comportamento térmico e elétrico do refrigerador doméstico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Doença: sofrimento e vida nas filosofias de Friedrich Nietzsche e Blase Pascal

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Distribuição de lei de potência gradualmente truncada aplicada na educação: vestibular da Academia da Força Aérea

Pós-graduação em Física - IGCE

La cadena de distribución y la competitividad de las exportaciones latinoamericanas: la exportación de manzanas y peras del alto valle del río Negro, Argentina

Incluye Bibliografía

Evolución y perspectivas del comercio y las inversiones intrarregionales

Incluye Bibliografía

Tarificación diferenciada de residuos sólidos domiciliarios: el caso de la tarificación por unidad en Chile

Incluye Bibliografía

Um filósofo na rua Erê: presença de Pascal em O amanuense Belmiro, de Cyro dos Anjos

Pós-graduação em Letras - FCLAS

Estudo dos aspectos eletrostáticos da interação entre polieletrólitos e macroíons

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Síntese e caracterização da cerâmica 'Ti IND. x''('Sm IND. 0,2''Ce IND. 0,8') IND. (1-x)''O IND. (2-Б) para aplicação como anodo em células a combustível de óxido sólido

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Enxertos venosos ao avesso e normal, preenchidos com plasma rico em plaquetas em nervo misto de rato

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)