Efeito do gradiente interior-borda-matriz, e do tipo de matriz sobre a entomofaúna edáfica em fragmentos de cerrado

edge effect. Thus, under the influence of the adjacent matrix, fragments undergo microclimatic alterations that accentuate changes in species composition and community structure. In order to better understand edge and matrix effects on the richness and abundance of edaphic arthropods, this study assessed: (a) the difference between habitat (fragment) and non-habitat (matrix); (b) whether there is a continuous interior-edge-matrix gradient; and (c) the difference between matrices for arthropod orders richness and abundance. We selected 15 landscapes, 5 of which contained a cerrado fragment surrounded by sugarcane cultivation, 5 with a cerrado fragment within eucalyptus and 5 with a cerrado fragment within pasture. In each landscape the soil fauna was collected along with the soil and then extracted with the aid of the modified Berlese-Tullgren funnel. We chose the orders Coleoptera, Collembola, Mesostigmata and Oribatida for analysis, and after separation of the individuals we used model selection analysis via AIC. The model type fragment x matrix was the most likely to explain richness, total and relative abundances of the four orders (wAICc between 0,6623 and 1,0). The model of edge distance (edge effect) was plausible to total abundance and relative abundance of Mesostigmata order (wAICc=0,2717 and 0,186). Local environmental variables (soil texture, temperature and relative humidity), and fragment size were also measured to avoid confounding factors and were not presented as plausible models to explain the patterns. So edaphic arthropods, despite protecting themselves under the ground, are extremely sensitive to fragmentation, even with the replacement of natural habitat by agricultural use, such as sugarcane, pasture and eucalyptus. This group should be studied environmental impact assessments because provides important ecosystem se ravincde s inacnludd eisd ainn efficient bio-indicator

Retorque de parafusos de pilares protéticos com recobrimento de carbono tipo diamante: uma análise da manutenção do torque após fadiga mecânica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo da qualidade da gasolina tipo A e sua composição química empregando análise de componentes principais

The type A gasoline samples were analyzed by gas chromatography with flame ionization detector (GC-FID) which allowed quantifying and classifying of the various compounds into different classes of hydrocarbons. Several physicochemical parameters were evaluated according to the official methods in order to compare the results obtained against the limits established by the Agência Nacional de Petróleo, Gás Natural e Biocombustíveis (ANP, 2011). Additionally, principal component analysis (PCA) was applied to discriminate the samples studied, which revealed the separation of four groups according to their chemical composition determined in samples collected from the eight fuel distributors in the State of Pará.

Investigação da expressão de genes do metabolismo lipídico em pacientes com Diabetes Mellitus tipo 2, Dislipidemia e Doença Periodontal Crônica

Pós-graduação em Odontologia - FOAR

Correntes críticas e comportamento dinâmico dos vórtices em fitas supercondutoras do tipo II com arranjos conformes de centros de aprisionamento

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito da área, da quantidade de habitat e do tipo de matriz sobre dieta de gato-maracajá (Leopardus wiedii)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito do gradiente interior-borda-matriz, e do tipo de matriz sobre a entomofaúna edáfica em fragmentos de cerrado

edge effect. Thus, under the influence of the adjacent matrix, fragments undergo microclimatic alterations that accentuate changes in species composition and community structure. In order to better understand edge and matrix effects on the richness and abundance of edaphic arthropods, this study assessed: (a) the difference between habitat (fragment) and non-habitat (matrix); (b) whether there is a continuous interior-edge-matrix gradient; and (c) the difference between matrices for arthropod orders richness and abundance. We selected 15 landscapes, 5 of which contained a cerrado fragment surrounded by sugarcane cultivation, 5 with a cerrado fragment within eucalyptus and 5 with a cerrado fragment within pasture. In each landscape the soil fauna was collected along with the soil and then extracted with the aid of the modified Berlese-Tullgren funnel. We chose the orders Coleoptera, Collembola, Mesostigmata and Oribatida for analysis, and after separation of the individuals we used model selection analysis via AIC. The model type fragment x matrix was the most likely to explain richness, total and relative abundances of the four orders (wAICc between 0,6623 and 1,0). The model of edge distance (edge effect) was plausible to total abundance and relative abundance of Mesostigmata order (wAICc=0,2717 and 0,186). Local environmental variables (soil texture, temperature and relative humidity), and fragment size were also measured to avoid confounding factors and were not presented as plausible models to explain the patterns. So edaphic arthropods, despite protecting themselves under the ground, are extremely sensitive to fragmentation, even with the replacement of natural habitat by agricultural use, such as sugarcane, pasture and eucalyptus. This group should be studied environmental impact assessments because provides important ecosystem se ravincde s inacnludd eisd ainn efficient bio-indicator

Retorque de parafusos de pilares protéticos com recobrimento de carbono tipo diamante: uma análise da manutenção do torque após fadiga mecânica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Producción de tomate tipo italiano en función del volumen de la celda y de la edad de las mudas

Con el objetivo de evaluar la influencia de las bandejas de celdas sobre la producción de tomate tipo italiano en el campo, se realizó este trabajo en Piracicaba, SP, Brasil, de mayo a agosto del 2005. Los tratamientos consistieron en cuatro volúmenes de recipiente, tres bandejas de poliestireno expandido de 121,2; 34,6 y 12,0 cm³ y de una bandeja de plástico rígido de 14,0 cm³ (72, 128, 288 y 450 celdas, respectivamente) combinadas con cuatro edades para el trasplante (19, 24, 29 y 34 días después de la siembra). El delineamiento para la producción de mudas fue completamente al azar, con cinco plantas por parcela y tres repeticiones. Se analizaron área foliar, altura, masa verde y seca de la parte aérea y raíz y la calidad de las mudas. En la producción a campo, el delineamiento fue en bloques al azar con diez plantas por parcela y tres repeticiones. Fueron evaluadas la precocidad para inicio de cosecha, producción comercial y total por planta. Volúmenes mayores de recipiente (121,2 y 34,6 cm³) presentaron mejor calidad de mudas. En la producción de frutos, el número comercial y total de frutos por planta fue superior en la muda de 24 días de edad, sin embargo, en la producción total de frutos, no hubo diferencia entre los tratamientos. Por otro lado, también se obtuvo precocidad para la cosecha en los tratamientos realizados en los volúmenes de 121,2 y 34,6 cm³. El volumen de recipiente de 14,0 cm³ (450 celdas) resultó en mudas de calidad muy inferior, alongadas y raquíticas.

Fotodegradação de compósitos de poliestireno/argila montmorilonita: efeito do tipo de argila e presença de sal

Compósitos de poliestireno/montmorilonita (PS/MMT) contendo 2,5% em peso de argila foram preparados com dois tipos de argila modificada com sais quaternários de amônio. Também foram preparadas amostras do PS + sal quaternário de amônio, utilizando-se proporção de sal semelhante à usada na modificação da argila. Todas as amostras foram expostas à radiação UV por períodos de até 12 semanas, e em seguida foram realizados testes para avaliar as modificações em massa molar, propriedades mecânicas (tração e impacto), estrutura química (FTIR) e superfície de fratura (MEV) dessas amostras. Os resultados mostraram que compostos metálicos existentes na argila catalisam o processo fotodegradativo do PS e a presença isolada do sal não altera significativamente o comportamento do PS frente à radiação UV.