7,893 research outputs found

    Ortorretificação e classificação de imagens dos satélites de alta resolução World View2 e GeoEye.

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    In the processing of high-resolution images there are still difficulties. And, due to the fact of specific software for treating high resolution images presents high cost, it is necessary to test different types of classifiers and parameters available in softwares low cost or free market to classify high-resolution images. Based on these considerations, the present study was developed to orthorectify and to test different algorithms to classify high resolution images, in this case images of satellite Word View2 and GeoEye. There were tested the following supervised classifiers available in ENVI 4.8 software: Spectral Angle Mapper, Maximum Likelihood, Mahalanobis Distance, Minimum Distance and Parallelepiped, applying them to sampled areas of two watersheds included in the Atlantic Forest in the state of Rio de Janeiro. The results showed that the best classifier for most classes was the Maximum Likelihood (MAXVER) to both images and watersheds. In general, the greatest possibility of confusion was found between the classes: Initial Vegetation and Advanced to Medium Vegetation (0.20), Advanced to Medium Vegetation and Banana (0.28), Initial Vegetation and Agriculture (0.29), Initial Vegetation and Banana (0.38), Banana and Agriculture (0.50), Pasture and Agriculture (0.80). The MAXVER was the classifier that presented best Overall Accuracy (65,38% and 63,165 to each sampled area) and Kappa Coefficient (0,60 and 0,57). But, these values were considered unsatisfactory.Pages: 1379-138

    Aspergillus ocratoxigênicos em uvas e no solo de cultivo da variedade Sauvignon Blanc no Nordeste brasileiro.

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    A ocratoxina A (OTA) é um metabólito secundário de fungos freqüentemente encontrado como contaminante de uvas, vinhos e suco de uva, sendo considerada uma das micotoxinas mais prejudiciais para a saúde humana. Este estudo teve como objetivo avaliar a incidência de Aspergillusocratoxigênicos em uvas e no solo de cultivo da variedade Sauvignon Blanc utilizada para produção de vinho no nordeste brasileiro. As amostras de uva e de solo foram coletadas em uma região vitivinícola do Submédio São Francisco (Casa Nova, Bahia). Para o isolamento de fungos das uvas e sementes utilizou-se a Técnica de Plaqueamento Direto em meio de cultura DRBC (Dicloran Rosa Bengal Cloranfenicol); para a amostra de solo foi utilizada a técnica de espalhamento superficial, em DG 18 (Dichloran 18% Glycerol Agar), a partir de diluições seriadas. Selecionou-se para obtenção de culturas puras apenas os fungos do gênero Aspergillus que foram identificados por características morfológicas e avaliados, quanto à produção de OTA, pelo Método Plug Agar. Das uvas foram isoladas e identificadas as seguintes espécies A. foetidus, A. tubingensis e A. sp.. Destes isolados nenhum foi ocratoxigênico. Dos vinte e nove isolados obtidos do solo, quatro foram ocratoxigênicos (A. niger agregado (1), A. carbonarius agregado (2) e A. carbonarius (1)), o que realça a importância de evitar durante a colheita o contato das uvas com o solo, visto que este pode representar uma fonte de contaminação com esta micotoxina para as uvas e vinhos. Palavras-chaves: Fungos ocratoxigênicos, Uvas, Aspergillus, Ocratoxina A, Solo, Sauvignon Blan

    Fungos ocratoxigênicos em solo de cultivo de uvas viníferas no Nordeste brasileiro.

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    Ocratoxina A (OTA) é um metabólito secundário de origem fúngica que tem recebido atenção crescente devido ao potencial perigo para os seres humanos e animais. Este estudo teve como objetivo avaliar a incidência de fungos ocratoxigênicos do gênero Aspergillus em solos de cultivo de uvas viníferas no nordeste brasileiro. Foram coletadas amostras de solo de cultivo de três variedades de uvas viníferas, Cabernet Sauvignon, Grenache e Petit Verdot de uma região vitivinícola do nordeste brasileiro. Para o isolamento de fungos foi utilizada a técnica de espalhamento superficial, em DG 18 (Dichloran 18% Glycerol Agar), a partir de diluições seriadas. Selecionou-se para obtenção de culturaspuras apenas os fungos do gênero Aspergillus que foram identificados por características morfológicas e avaliados, quanto à produção de OTA, pelo Método Plug Agar. Das amostras de solo foram isoladas e identificadas as seguintes espécies A. foetidus, A. aculeatus, A. niger, A. tubingensis, A. carbonariuse A. ibericus. Dos vinte e quatro isolados fúngicos obtidos quatro foram ocratoxigênicos (A. niger (1), A. tubingensis (1) e A. carbonarius (2)), o que evidência a importância de evitar durante a colheita o contato das uvas com o solo, visto que este pode representar uma fonte de contaminação com esta micotoxina para as uvas e vinhos.Palavras-chaves: Fungos ocratoxigênicos, Uvas viníferas, Aspergillus, Ocratoxina A, Sol

    Projeto-piloto de promoção comercial de frutas da produção integrada: fundamentos e resultados.

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    Systematic review of fatty acid composition of human milk from mothers of preterm compared to full-term infants

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    Background: Fatty acid composition of human milk serves as guidance for the composition of infant formulae. The aim of the study was to systematically review data on the fatty acid composition of human milk of mothers of preterm compared to full-term infants. Methods: An electronic literature search was performed in English (Medline and Medscape) and German (SpringerLink) databases and via the Google utility. Fatty acid compositional data for preterm and fullterm human milk were converted to differences between means and 95% confidence intervals. Results: We identified five relevant studies publishing direct comparison of fatty acid composition of preterm versus full-term human milk. There were no significant differences between the values of the principal saturated and monounsaturated fatty acids. In three independent studies covering three different time points of lactation, however, docosahexaenoic acid (DHA) values were significantly higher in milk of mothers of preterm as compared to those of full-term infants, with an extent of difference considered nutritionally relevant. Conclusion: Higher DHA values in preterm than in full-term human milk underlines the importance of using own mother's milk for feeding preterm babies and raises the question whether DHA contents in preterm formulae should be higher than in formulae for full-term infants. Copyright (c) 2008 S. Karger AG, Basel

    Paleoclimatic and paleobiological correlations by mammal faunas from Southern America and SW Europe

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    Proceedings of the 1" R.C.A.N.S. Congress, Lisboa, October 1992The preliminary results of a research dealing with the study of global changes in the last 5 Ma by correlations of continental records between the Northern and the Southern Hemispheres (SW Europe and Argentina, respectively) are reported. The first analyses of the evolutionary patterns point out, in Argentina, two different turnover times: the first one is characterized by a high percentage of mammalautochthonous extinctions placed in the span of time between the last Chapadmalalan and the first Ensenadan faunas, around 2.5-2.3 Ma. It is possible to identify a high percentage of new immigrant genera from North America in the first turnover, while the second one, associated to the "last Pleistocene megafaunal extinctions", probably occurred at the beginning of the "Glacial Pleistocene", around 1.0-0.8 Ma. The oxygen isotope composition of phosphate from fossil mammal bones was measured to have a better climatic resolution from faunal elements of two hemispheres and to compare them by results as quantitative as possible. The preliminary efforts are brought out on fourteen deposits from SE Spain. Isotopic and chemical results strongly suggest the existence of a relation between the oxygen isotope composition in various skeletal components and the taphonomic processes of a single deposit. The variations of 0180 in the mammal teeth of Equidae from SE Spain suggest a shift towards a colder environment from the older one, Huelago, to more recent deposits, as well as from Venta Micena to Fuensanta in agreement with the transition from the Middle to the Upper Villafranchian, around 2.5 Ma, and the transition between the "Preglacial" to the "Glacial" Pleistocene, around 1.9-0.8 Ma
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