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Search Results: 1 - 10 of 220867 matches for " Nilton César Mantovani "
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REGENERA O IN VITRO DE LOURO-PARDO (Cordia trichotoma (Vellozo) Arrabida ex Steudel)
Nilton César Mantovani,Elci Terezinha Henz Franco,Silvane Vestena
Ciência Florestal , 2001,
Abstract: A regenera o in vitro foi desenvolvida para louro-pardo (Cordia trichotoma (Vellozo) Arrabida ex Steudel). Segmentos nodais foram desinfestados e inoculados em dois meios básicos de cultura: WPM (Wood Plant Médium, 1981) e MS (Murashige & Skoog, 1962) suplementados com BAP (6-Benzilaminopurina), TDZ (Thidiazuron), ANA (ácido-1-Naftaleno Acético), GA3 (ácido Giberélico), AIB (ácido Indol-3-Butírico) e CA (Carv o Ativado) em diferentes combina es e concentra es para cada fase de desenvolvimento. As maiores taxas de multiplica o e alongamento de brota es foram obtidas com o meio WPM acrescido de 0,1 mg.l-1 de BAP e GA3. O melhor enraizamento das brota es foi obtido com AIB (0,5 mg.l-1) combinado ao Carv o Ativado (1,5 g.l-1) acrescidos ao meio de cultura.
MICROPROPAGA O DE CAIXETA, Didymopanax morototoni (Aubl.) Dcne. et Planch.
Nilton César Mantovani,Elci T. H. Franco,Miguel P. Guerra,Juarez M. Hoppe
Ciência Florestal , 1998,
Abstract: O presente trabalho objetivou estabelecer um protocolo básico para a micropropaga o da caixeta Didymopanax morototoni (Aubl.) Dcne. et Planch. Segmentos nodais foram desinfestados em hipoclorito de sódio 10 % por diferentes periodos de exposi o, e inoculados em dois meios básicos: WPM (Lloyd & McCown, 1981) e MS (Murashige & Skoog, 1962) suplementados com BAP, TDZ, ANA, GA3 , AIB e carv o ativado em diferentes combina es e concentra es para cada estádio de desenvolvimento. A desinfesta o dos segmentos nodais com hipoclorito de sódio por 10 minutos proporcionou os melhores resultados para o estabelecimento asséptico das culturas. A maior taxa de regenera o e alongamento de brota es foi obtida com o meio WPM contendo 1,0 mg.l-1 de BAP. Contudo após três subcultivos neste mesmo meio observou-se redu o na taxa de multiplica o. O enraizamento das brota es foi obtido no meio WPM suplementado com 1,0 mg.l-1 de AIB. O processo de aclimatiza o possibilitou a sobrevivência das plantulas micropropagadas às condi es ex vitro.
Análise das rela??es entre desflorestamentos e focos de calor: estudo de caso nos municípios de Altamira e S?o Félix do Xingu, no Estado do Pará
Martinez, Luciano Lamper;Fiedler, Nilton César;Lucatelli, Geraldo José;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000400014
Abstract: the present study was developed in a test field of an area known as "terra do meio". it is located in the municipal districts of altamira and s?o félix do xingu, state of pará. the general objective of this work was to analyze the relationship between deforestation and hotspots in the period from 1998 to 2002. the specific objectives were to verify whether there is any relationship between the size of the deforested area and the incidence of hotspots; as well as to find out whether the process of obtaining and geopositioning of noaa images interferes in the overlapping of hotspots with polygons of deforestation. the data were analyzed in a geographical information system (s.i.g.). for determining the relation between the variables, two regression analyses were carried out: linear and 2nd degree polynomial. once the equations were obtained, a test of significance of the linear and quadratic components was accomplished. then, the coefficient of determination was calculated, in order to choose the best-fit equation to the data distribution. positive relationship was found within the analyzed data. the relationship was greater when hotspots and increase in deforestation in the same period were overlapped. the largest deforestation areas showed more consistent results. the linear and quadratic components of the resulting equations were more significant with the use of "t" test. the equations obtained by the method of linear regression were chosen to represent the data distribution, because they are considered simpler. the larger number of overlapping between the hotspots and deforestation in areas of more than 100 hectares suggests that the deforestation size directly influences fire detection. the obtaining and geopositioning of noaa images do not interfere in this overlapping. the results suggest that the products generated by noaa satellites are suitable for hotspot detection. however, they are imprecise when it comes to locating and dimensioning the affected areas.
Adapta??o tanscultural de escala de auto-estima para adolescentes
Avanci, Joviana Q.;Assis, Simone G.;Santos, Nilton César dos;Oliveira, Rachel V. C.;
Psicologia: Reflex?o e Crítica , 2007, DOI: 10.1590/S0102-79722007000300007
Abstract: the article proposes a cross-cultural adaptation (herdman, fox-rushby & badia, 1998) of "rosenberg self-esteem scale" for adolescents who live in an urban neighborhood of rio de janeiro (s?o gon?alo). the sample was composed of 266 adolescents, students of the 7th/ 8th grade of elementary school and of the 1st/2nd grade of high school, of public and private schools of s?o gon?alo/rj. the following equivalences were evaluated: conceptual and itens equivalences, semantic equivalence (referential and general meaning), measurement equivalence (test-retest reliability, internal consistency, factorial analysis and construct validity) and operational and functional equivalences. good results were obtained for semantics equivalence, alpha of cronbach was of 0.68, the kappa was moderate and regular, and the factorial analysis proposed two structures of factors (low and high self-esteem). construct validity showed significant positive correlation with social support and negative correlation with psychological abuse, violence between parents and brothers. the results indicate the applicability of the scale in a reference population, suggesting the necessity to develop others studies in distinct samples.
Escala de violência psicológica contra adolescentes
Avanci,Joviana Q; Assis,Simone G; Santos,Nilton César dos; Oliveira,Rachel V C;
Revista de Saúde Pública , 2005, DOI: 10.1590/S0034-89102005000500002
Abstract: objective: to present strategies and results of a cross-cultural adaptation of a psychological violence scale to be used in brazilian studies. methods: the scale of violence, a translated version in portuguese of the original in english, was applied to a sample of 266 7th and 8th grade and junior high school students of public and private schools of the municipality of s?o gon?alo, southeastern brazil. several types of equivalences were investigated. the semantic equivalence was evaluated in the referential and general meaning of each item. the measurement equivalence was assessed through psychometric properties such as test and retest reliability, construct validity, internal consistency and factorial analysis. reliability was measured by kappa and intraclass correlation coefficients and construct validity was evaluated by pearson's coefficient. results: the theoretical-conceptual discussions were deemed adequate concerning conceptual and items equivalences. the semantic equivalence was above 60 percentile in the evaluation of the referential and general item meaning. cronbach's alpha was 0.94, kappa index agreement was discreet, intraclass correlation coefficient was 0.82 and the factorial analysis with one factor structure had a degree of explanation of 43.5% variance. construct validity showed significant negative correlation with self-esteem, social support, and a positive correlation with parent violence. conclusions: the study results indicate the applicability of the instrument in the brazilian teenager population.
Cross-cultural adaptation of self-esteem scale for adolescents / Adapta o transcultural de escala de auto-estima para adolescentes
Joviana Q. Avanci,Simone G. Assis,Nilton César dos Santos,Rachel V. C. Oliveira
Psicologia: Reflex?o e Crítica , 2007,
Abstract: The article proposes a cross-cultural adaptation (Herdman, Fox-Rushby & Badia, 1998) of "Rosenberg Self-Esteem Scale" for adolescents who live in an urban neighborhood of Rio de Janeiro (S o Gon alo). The sample was composed of 266 adolescents, students of the 7th/ 8th grade of Elementary School and of the 1st/2nd grade of High School, of public and private schools of S o Gon alo/RJ. The following equivalences were evaluated: conceptual and itens equivalences, semantic equivalence (referential and general meaning), measurement equivalence (test-retest reliability, internal consistency, factorial analysis and construct validity) and operational and functional equivalences. Good results were obtained for semantics equivalence, alpha of Cronbach was of 0.68, the Kappa was moderate and regular, and the factorial analysis proposed two structures of factors (low and high self-esteem). Construct validity showed significant positive correlation with social support and negative correlation with psychological abuse, violence between parents and brothers. The results indicate the applicability of the scale in a reference population, suggesting the necessity to develop others studies in distinct samples.
Efeito das condi es de colheita, pré-processamento e armazenamento na qualidade do milho-pipoca
RUFFATO SOLENIR,CORRêA PAULO CéSAR,MARTINS JOSé HELVECIO,MANTOVANI BáRBARA HELIODORA MACHADO
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Com o objetivo de identificar parametros de decréscimos de qualidade de milho-pipoca, foram avaliados os efeitos dos métodos de colheita e debulha de gr os, dos teores de umidade inicial, da temperatura do ar de secagem e do tempo de armazenamento sobre a capacidade de expans o das cultivares Zélia e CMS 43. A colheita foi realizada quando ambas as cultivares de milho-pipoca atingiram o teor de umidade de 19% b.u. e, posteriormente, 15% b.u. Foram utilizadas a colheita e debulha manuais e a colheita mecanica com diferentes velocidades do cilindro debulhador. O produto foi submetido à secagem artificial em camada fina. Periodicamente, realizou-se o teste-padr o de qualidade relativo à capacidade de expans o do milho-pipoca. A qualidade do gr o foi afetada significativamente pela colheita mecanica e pelo aumento da temperatura do ar de secagem mas n o foi reduzida durante o armazenamento. Os melhores valores de capacidade de expans o, com rela o à maioria dos tratamentos, foram obtidos depois de 270 dias de armazenamento. O milho-pipoca da cultivar Zélia apresentou-se com qualidade comercial superior à da cultivar CMS 43, porém é necessário salientar que esta última encontra-se ainda em fase de desenvolvimento e melhoramento genético.
Coupled Double Quantum Wells
élder Mantovani Lopes,Daniel Ferreira César,José Leonil Duarte,Ivan Frederico Lupiano Dias
Semina : Ciências Exatas e Tecnológicas , 2010,
Abstract: The progress of the semiconductor growth techniques allows the opportunity to produce new semiconductors devices that may contribute to the development of the nanotechnology. The fabrication of semiconductor heterostructures with high quality allows the obtaining of new effects based on the quantum properties of those systems, which have stimulated great technological interest, especially on the optoelectronic and telecommunications fields. In this work some basic concepts related to one of those heterostructures are discussed: the Coupled Double Quantum Well (CDQW). The deduction of the expression for the determination of the energy levels in CDQWs is presented in details. The results obtained through this expression are compared with experimental results obtained through photoluminescence (PL) measurements, complementing the work.
Avalia??o da tipologia dos resíduos de constru??o civil entregues nas usinas de beneficiamento de Belo Horizonte
Carmo, Daniel de Souza;Maia, Nilton da Silva;César, Cristina Guimar?es;
Engenharia Sanitaria e Ambiental , 2012, DOI: 10.1590/S1413-41522012000200008
Abstract: the aim of this article was to expose the current state of affairs regarding the generation of waste in belo horizonte so as to present the main characteristics of construction civil waste (ccw) involving their typology, origin, predominance in their composition, as well as data about the construction sites that generated them, their construction pattern and type of building. the results show that the majority of the waste generated in belo horizonte is of ceramic base, deriving from house renovations construction sites classified as normal finishing standard located mainly in the center south and pampulha areas. by determining these characteristics it was possible to establish recommendations applicable to the recycling plants as well as to the waste management system in belo horizonte to minimize the causes of the variability of the recycled aggregates generated from construction civil waste.
Altera??es estruturais e comportamento compressivo de um Latossolo Vermelho distrófico argiloso sob diferentes sistemas de uso e manejo
Oliveira, Geraldo César de;Dias Junior, Moacir de Sousa;Resck, Dimas Vital Siqueira;Curi, Nilton;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000200017
Abstract: one of the consequences of inadequate soil management is its compaction that causes the loss of its sustainability and reduction of its productivity. the objective of this study was to evaluate the structural changes and the compressive behavior of a latosol (oxisol) under native vegetation, "cerrado" (c), no-till (nt) and conventional till (ct) system, after two decades of use. the undisturbed soil samples were used to characterize the soil bulk density, the porous space and to perform the uniaxial compression test. the disturbed soil samples were used for soil physical and chemical characterization analyses in the analyzed depth. the bulk density varied in the following order: nt = ct > c (0 to 5 cm) and ct > nt > c (20 to 30 cm). organic matter data showed that in the c = nt > ct (0 to 5 cm) and c = nt = ct (20 to 30 cm), showing the nt capacity of increasing organic matter. the preconsolidation pressure changed in the following order: nt = c > ct (0 to 5 cm; tension -1,500 kpa), and ct > c = nt (20 to 30 cm; tension -1,500 kpa).
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