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	Provedor de dados Anais da ABC (AABC) (4) Autor Baptista-Neto,José A. (4) Barreto,Cintia F. (2) Barth,Ortrud M. (2) Smith,Bernard J. (2) Vilela,Claudia G. (2) Castanheira,Fabio S. (1) Luz,Cynthia F.P. da (1) McAllister,John J. (1) Mcallister,John J. (1) Pereira,Edisio (1) Silva,Maria Augusta M. (1) Mais... Palavra-chave Guanabara Bay (3) Air pollution (1) Brazil (1) Deposition (1) Granite (1) Gypsum crusts (1) Heavy metals (1) Marine aerosols (1) Paleoenvironment (1) Palynomorphs (1) Pollen (1) Preservation (1) Quaternary Palynology (1) Surface sediments (1) Urban runoff (1) Weathering (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2012 (1) 2007 (2) 2006 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Palynological analysis of a sediment core obtained in Guanabara Bay, Rio de Janeiro, Brazil Anais da ABC (AABC) Barreto,Cintia F.; Luz,Cynthia F.P. da; Baptista-Neto,José A.; Vilela,Claudia G.; Barth,Ortrud M.. The sediment of a core collected about 2 km north of Paquetá Island, Guanabara Bay, was submitted to pollen analysis, in order to recognize the dynamics of the regional vegetation, and the anthropic influence. Radiocarbon dating of a sample next to the bottom of the core indicates an age of 4.210 ± 40 14C yrs B.P (calibrated age). It was possible to establish four palynological zones. Starting at the bottom of the core, a decrease in palynomorph concentration, the presence of degraded pollen grains and spores, and the predominance of ombrophilous forest pollen grains were observed in the basal portion of Zone I. These data may indicate the presence of an exuberant Atlantic Forest, dominated by a marine regressive event. The concentration of well-preserved... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pollen; Quaternary Palynology; Guanabara Bay; Paleoenvironment. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200005 The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil Anais da ABC (AABC) Pereira,Edisio; Baptista-Neto,José A.; Smith,Bernard J.; Mcallister,John J.. In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would... Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metals; Urban runoff; Guanabara Bay. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400013 Spatial distribution of pollen grains and spores in surface sediments of Guanabara Bay, Rio de Janeiro, Brazil Anais da ABC (AABC) Barreto,Cintia F.; Vilela,Claudia G.; Baptista-Neto,José A.; Barth,Ortrud M.. Aiming to investigate the deposition of pollen grains and spores in Guanabara Bay, Rio de Janeiro State, 61 surface sediment samples were analyzed. The results showed that the current deposition of palynomorphs in surface sediments of Guanabara Bay represents the regional vegetation of this hydrographic basin. The differential distribution of palynomorphs followed a pattern influenced by bathymetry, tidal currents speed, discharge of numerous rivers, and by human activity. The dominance of representatives of Field Vegetation reflects the changes of the original flora caused by intense human activities in the region. The continued presence and richness of pollen types of rain forest in the samples indicates that their source area might be the vegetation... Tipo: Info:eu-repo/semantics/article Palavras-chave: Palynomorphs; Surface sediments; Deposition; Preservation; Guanabara Bay; Brazil. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300006 Surface modification of a granite building stone in central Rio de Janeiro Anais da ABC (AABC) Baptista-Neto,José A.; Smith,Bernard J.; McAllister,John J.; Silva,Maria Augusta M.; Castanheira,Fabio S.. In order to evaluate environmental controls on the soiling formation and decay of building stones a set of mapping and physical and chemical analyses were carried out on granite from a historical church in the polluted centre of Rio de Janeiro. These techniques highlight the increasing of threatening damage on generally perceived as a durable building material, caused by granular disaggregation and contour scaling in areas close to ground level. Mapping also indicated the formation of black crusts over entire building façades, concentrated on areas sheltered from rain-wash. Analyses demonstrated the influence of marine aerosols, rock and mortar composition and mostly of the atmospheric pollutants on the decay and soiling of the granite. Much of the decay... Tipo: Info:eu-repo/semantics/article Palavras-chave: Weathering; Granite; Air pollution; Marine aerosols; Gypsum crusts. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200011 Registros recuperados: 4 Primeira ... 1 ... Última

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