Sensor Lambda
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Neuro estimador para o fluxo de gases entre a superfície terrestre e a atmosfera / A neuro estimator for the flux of gases between the surface land and the atmosphere
Studies show that global warming may be irreversible in the medium or long term, and is a major cause of air pollution. However, this framework can be reversed or mitigated by estimating the amount of emissions, since the mapping of pollution sources could facilitate the work of public authorities in relation to environmental monitoring and the development o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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2. Síntese, caracterização microestrutural e elétrica de compostos cerâmicos à base de soluções sólidas de titanato de estrôncio, titanato de cálcio e óxido de ferro / Synthesis, microstructural and electrical characterization of ceramic compounds based on strontium and calcium titanates and iron-oxide
CaxSr1-xTi1-yFeyO3-δ, x = 0, 0.5 and 1.0, y = 0 and 0.35, ceramic compounds were synthesized by reactive solid state synthesis of CaCO3, SrCO3, TiO2 and Fe2O3, and by the polymeric precursor technique. The ceramic powders were evaluated by thermogravimetry and differential thermal analysis, X-ray diffraction and scanning electron microscopy. Sintered c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2011
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3. ANALYSIS OF ELECTROMAGNETIC PROPAGATION THROUGH OIL WELLS WITH THE AID OF DECISION SUPPORT TECHNIQUES / ANÁLISE DA PROPAGAÇÃO ELETROMAGNÉTICA ATRAVÉS DE POÇOS DE PETRÓLEO COM AUXÍLIO DE TÉCNICAS DE APOIO À DECISÃO
Análise da propagação eletromagnética através de poços de petróleo com auxílio de técnicas de apoio a decisão estuda a viabilidade de telemetria sem fio de fundo de poço a quilômetros de profundidade. A maior dificuldade são as perdas por propagação, definindo, assim, a direção de pesquisa deste trabalho. Essa dificuldade surge devido a gran
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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4. Influencia da microestrutura e da espessura das ceramicas prensadas na transmitancia da luz e na dureza knoop do cimento resinoso / Influence of tfhe microstructure and thickness of the pressable ceramic in the light transmittance and knoop hardness of the resin cement
O objetivo deste estudo foi avaliar a influência da microestrutura e espessura das cerâmicas prensadas na intensidade e transmitância da luz e na eficiência da polimerização do cimento resinoso de dupla ativação Variolink II, fotoativado através de duas cerâmicas prensadas reforçadas com cristais de leucita. Foram confeccionados amostras das cerâ
Publicado em: 2007
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5. Nanopores: maltoporin channel as a sensor for maltodextrin and lambda-phage
BioMed Central.
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6. Mutational analysis reveals functional similarity between NARX, a nitrate sensor in Escherichia coli K-12, and the methyl-accepting chemotaxis proteins.
During anaerobic growth, nitrate induces synthesis of the anaerobic respiratory enzymes formate dehydrogenase-N and nitrate reductase. This induction is mediated by a transcription activator, the narL gene product. The narX gene product may be involved in sensing nitrate and phosphorylating NARL. We isolated narX mutants, designated narX*, that caused nitrat
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7. Cloning, expression, and crystallization of recoverin, a calcium sensor in vision.
Recoverin, a recently discovered 23-kDa calcium-binding protein, activates retinal rod guanylate cyclase when the calcium level is lowered in the submicromolar range. We report here the cloning and sequencing of a cDNA for recoverin from a bovine retinal expression library. The recoverin coding sequence was inserted into a pET-11a expression vector under con
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8. Identification and characterization of hydrogen peroxide-sensitive mutants of Escherichia coli: genes that require OxyR for expression.
Escherichia coli produces an inducible set of proteins that protect the cell from exogenous peroxide stress. A subset of these genes is induced by hydrogen peroxide and is controlled at the transcriptional level by the OxyR protein. To identify additional genes involved in protection from hydrogen peroxide, a library of random transcriptional fusions of lamb
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9. The Vibrio cholerae acfB colonization determinant encodes an inner membrane protein that is related to a family of signal-transducing proteins.
Vibrio cholerae accessory colonization factor genes (acfA, B, C, and D) are required for efficient intestinal colonization. Expression of acf genes is under the control of a regulatory cascade that also directs the synthesis of cholera toxin and proteins involved in the biogenesis of the toxin-coregulated pilus. The gene for acfB was cloned by using an acfB: