Artificial Sediments
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design
ABSTRACT Studies involving coastal sediment resuspension have shown that trace metals could be released to the water column due to changes in physical-chemical conditions. Therefore, if environmental agencies adopt screening protocols with insufficient evaluations of contaminant mobilization risks for a given area, the prediction of environmental impacts cau
Braz. j. oceanogr.. Publicado em: 22/07/2019
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2. Spatial Interpolation of Rainfall Erosivity Using Artificial Neural Networks for Southern Brazil Conditions
ABSTRACT Water erosion is the process of disaggregation and transport of sediments, and rainfall erosivity is a numerical value that expresses the erosive capacity of rain. The scarcity of information on rainfall erosivity makes it difficult or impossible to use to estimate losses occasioned by the erosive process. The objective of this study was to develop
Rev. Bras. Ciênc. Solo. Publicado em: 19/09/2016
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3. Yeast diversity associated to sediments and water from two Colombian artificial lakes
In Colombia, knowledge of the yeast and yeast-like fungi community is limited because most studies have focused on species with clinical importance. Sediments and water represent important habitats for the study of yeast diversity, especially for yeast species with industrial, biotechnological, and bioremediation potential. The main purpose of this study was
Braz. J. Microbiol.. Publicado em: 18/04/2014
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4. Transformações na matéria orgânica nos sedimentos e águas eutrofizados da Represa Ibirité (Ibirité-Sarzedo, MG) tratados com nitrato de cálcio em microcosmos
Due to the growing concern with the environment and the welfare of future generations the search for the restoration of degraded areas and the reestablishment of equilibrium between the anthropogenic and natural environments are nowadays highlighted. The Ibirité Reservoir (Ibirité-Sarzedo, MG) is an example of water body impacted by the disorganized urbani
Publicado em: 2010
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5. Estudos limnológicos e ecotoxicológicos da bacia do Alto Jacaré-Guaçu com ênfase no desenvolvimento de sedimentos artificiais para avaliação da toxicidade do cromo / Limnological and ecotoxicological studies in the Alto Jacaré-Guaçu basin emphasizing the development of artificials sediments to evaluate the chromium toxicity
O presente estudo teve como objetivo avaliar a qualidade dos rios da bacia hidrográfica do Alto Jacaré-Guaçu por meio de análises físicas, químicas, biológicas e ecotoxicológicas. Para tanto foram realizadas quatro amostragens (abril/07; julho/07; outubro/07 e janeiro/08) nos quais foram amostrados água e sedimento em quatorze pontos distribuídos n
Publicado em: 2010
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6. Mapeamento do potencial mineral para niquel e ouro no Cinturão Metassedimentar Nova Brasilandia - Rondonia por meio de logica nebulosa (fuzzi) e redes neurais artificiais / Mineral potential mapping for nickel and gold in Nova Brasilandia Metassedimentar Belt - Rondonia trough fuzzy logic and artificial neuraL networks
Analysis and integration of spatial data from different natures, particularly on Geographic Information Systems (GIS), is a well known technique in mineral prospection. The available tools and other ones recently developed can help prospection campaigns where there is not enough geologic and metalogenetic knowledge, as the Nova Brasilândia Metassedimentar B
Publicado em: 2008
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7. Life cicle aspects of endemic benthic species and its aplication on the sediment quality assesments of natural lakes and reservoirs / Aspectos do ciclo de vida de espécies bentônicas nativas e sua utilização na avaliação da qualidade de sedimentos de lagos naturais e reservatórios
The ecological studies, with views for the conservation of the environment, have been intensified from middles of the century XX. Due to the integration with several other sciences during the process of ecological knowledge formation, those studies have become essential to the development of technologies and appropriate politics for the administration of the
Publicado em: 2007
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8. Species assembly rules and the biodiversity-ecosystem functioning relationship / Regras entre assemblÃias de espÃcies: relaÃÃo entre biodiversidade e funcionamento do ecossistema
The biological diversity of ecosystems has important implications for their functioning. However, in order for reliable predictions to be made on the effects of species extinctions and/or additions on particular ecosystem functions, accurate knowledge is required on the ways in which species interact. These interactions in turn are important drivers of commu
Publicado em: 2007
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9. Simulador computacional do comportamento em regime de poços de petróleo equipados com gas-lift contínuo / Simulador computacional do comportamento em regime de poços de petróleo equipados com gas-lift contínuo / Simulador computacional do comportamento em regime de poços de petróleo equipados com gas-lift contínuo / Simulador computacional do comportamento em regime de poços de petróleo equipados com gas-lift contínuo
Dentre os resultados do Projeto AutPoc Automação de Poços, estabelecido entre UFRN e Petrobras com o apoio do CNPq, FINEP, CTPETRO, FUNPEC, foi desenvolvido um simulador para poços de petróleo equipados com o método de elevação por gas-lift contínuo. O gas-lift é um método de elevação bastante utilizado em produção offshore (produção
Publicado em: 2004
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10. Aspectos Morfo-Dinâmicos daComplexo Lagunar Nísia Floresta-Papeba-Guaraíras, Região Costeira Sul Oriental Do RN
This dissertation presents the results of research developed in the Nísia Floresta-Papeba-Guaraíras Lagoon Complex, located on the south coast of the Rio Grande do Norte State. The main objectives of this dissertation were the stratrigraphic characterization, in detail scale, of the and the coastal dynamics study of the lagoonal deposits sedimentation, as
Publicado em: 2000
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11. Detection of Horizontal Gene Transfer by Natural Transformation in Native and Introduced Species of Bacteria in Marine and Synthetic Sediments
Both naturally occurring marine sediments and artificial sediments were used as supports for natural transformation of marine bacteria. While transformation of Pseudomonas stutzeri ZoBell suspended in artificial seawater was not detected when recipient cells and rifampin resistance DNA were loaded onto sterile sediment columns, transformation could be detect
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12. Microbial Manganese Reduction by Enrichment Cultures from Coastal Marine Sediments
Manganese reduction was catalyzed by enrichment cultures of anaerobic bacteria obtained from coastal marine sediments. In the absence of oxygen, these enrichment cultures reduced manganates when grown on either lactate, succinate, or acetate in both sulfate-free and sulfate-containing artificial seawaters. Sodium azide as well as oxygen completely inhibited