11,676 research outputs found

    A new method for quantification of hepatobiliary scintigraphy using 99mTc-mebrofenin. A comparative study

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    A method based upon the application of mathematical techniques of deconvolution on the classical compartmental model for the quantitative study of liver function from hepatobiliary scintigraphy using 99mTc-mebrofenin data is proposed. The theory in which the method is based upon is presented and a comparison with a published methodology of obtaining the hepatic extraction after scintigraphic sudies has been performed using the results on 36 rats studies obtained with the two methods. A highly significant correlation between the two techniques was verified. The characteristics of the two methodologies, the proposed one based upon a theoretical approach and the other one on an empirical approximation are discussed. Comments are made on the interest and limitations of the presented technique that may be an useful tool for the evaluation of hepatic insufficiency

    Estrutura de uma √°rea de caatinga invadida por algarobeira na Fazenda Gavi√£o, Petrolina-PE.

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    Objetivando a an√°lise dessas forma√ß√Ķes vegetais no munic√≠pio de Petrolina-PE, comparou-se duas vegeta√ß√Ķes de caatinga, sendo uma invadida por algarobeira (Prosopis juliflora (S w) DC)

    Numerical modeling of surface runoff and erosion due to moving rainstorms at the drainage basin scale

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    A physically-based distributed erosion model (MEFIDIS) was applied to evaluate the consequences of storm movement on runoff and erosion from the Alenquer basin in Portugal. Controlled soil flume laboratory experiments were also used to test the model. Nine synthetic circular storms were used, combining three storm diameters (0.5, 1 and 2 times the Alenquer basin's axial length) with three speeds of storm movement (0.5, 1 and 2 m/s); storm intensities were synthesized in order to maintain a constant rainfall depth of 50 mm. The model was applied to storms moving downstream as well as upstream along the basin's axis. In all tests, downstream-moving storms caused significantly higher peak runoff (56.5%) and net erosion (9.1%) than did upstream-moving storms. The consequences for peak runoff were amplified as the storm intensity increased. The hydrograph shapes were also different: for downstream-moving storms, runoff started later and the rising limb was steeper, whereas for upstream moving storms, runoff started early and the rising limb was less steep. Both laboratory and model simulations on the Alenquer basin showed that the direction of storm movement, especially in case of extreme rainfall events, significantly affected runoff and soil loss.http://www.sciencedirect.com/science/article/B6V6C-4K7WTYF-3/1/05f00859098982a6ae43cfee9cc48fe

    Influência da posição do tronco nas características do carvão de Eucalyptus benthamii.

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    Estrutura genética populacional de bacurizeiros na região Meio-Norte do Brasil.

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    A regi√£o Meio-Norte caracteriza-se pela sua biodiversidade, com destaque para esp√©cies frut√≠feras nativas, como, por exemplo, o bacurizeiro, cujos frutos s√£o apreciados na alimenta√ß√£o pelas popula√ß√Ķes locais. A fragmenta√ß√£o e/ou desmatamento que ocorre nessa √°rea causa danos para popula√ß√Ķes de plantas, afetando a estrutura gen√©tica destas. Assim esse estudo verificou a estrutura√ß√£o gen√©tica em cinco popula√ß√Ķes de bacurizeiro dos Estados do Maranh√£o e Piau√≠ por meio de marcadores entre simples sequ√™ncias repetidas (ISSR) e da an√°lise de vari√Ęncia molecular. Da diversidade gen√©tica total, 28,88% foi dividido entre as popula√ß√Ķes e 77,16% dentro das popula√ß√Ķes, portanto h√° estrutura√ß√£o significativa entre as popula√ß√Ķes

    Relação genética baseada em análises ISSR em bacurizeiros oriundos de Barras - PI.

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    A utiliza√ß√£o do bacurizeiro, uma esp√©cie frut√≠fera, com finalidade madeireira come√ßou a comprometer a variabilidade gen√©tica da esp√©cie. Assim, marcadores entre simples sequ√™ncias repetidas (ISSR) foram usados para caracterizar 15 gen√≥tipos de bacurizeiro que comp√Ķem √† Cole√ß√£o de Germoplasma da Embrapa Meio-Norte. O coeficiente de dist√Ęncia Euclidiana foi usado para a constru√ß√£o de uma matriz de dist√Ęncia gen√©tica e dendrograma. Foram amplificados 226 locos de DNA, utilizando-se 17 primers. Foi obtida uma m√©dia de 8,38 de dist√Ęncia entre os gen√≥tipos, o que indica uma alta diversidade gen√©tica. A maior dissimilaridade foi obtida entre os gen√≥tipos BGB 7 e BGB 19 e BGB 7 e BGB 70 (12,77) e podem constituir bons genitores em programas de melhoramento

    Diagnose das principais doenças do cupuaçuzeiro (Theobroma grandiflorum (Willd. ex Spreng.) Schum.) e seu controle.

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    Cupuaçu: vassoura-de-bruxa, morte progressiva, podridao vermelha, mancha de Phomopsis.bitstream/CPAA-2009-09/2032/1/Doc_9_98.pd

    Influencia da embalagem e condicoes de armazenamento na longevidade de sementes florestais.

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    Permite conhecer as condicoes de embalagens de armazenamento que proporcionem maior longevidade das sementes de angico (Anadenanthera macrocarpa (Benth) Brenan, Pau d'arco (Tabebuia impetiginosa Mart) e imbirucu (Pseudobombax simpliciflolium A. Robyns)

    Beyond Mean-Field Low-Lying Excitations of Dipolar Bose Gases

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    We theoretically investigate various beyond mean-field effects on Bose gases at zero temperature featuring the anisotropic and long-range dipole-dipole interaction in addition to the isotropic and short-range contact interaction. Within the realm of the Bogoliubov-de Gennes theory, we consider static properties and low-lying excitations of both homogeneous and harmonically trapped dipolar bosonic gases. For the homogeneous system, the condensate depletion, the ground-state energy, the equation of state, and the speed of sound are discussed in detail. Making use of the local density approximation, we extend these results in order to study the properties of a dipolar Bose gas in a harmonic trap and in the regime of large particle numbers. After deriving the equations of motion for the general case of a triaxial trap, we analyze the influence of quantum fluctuations on important properties of the gas, such as the equilibrium configuration and the low-lying excitations in the case of a cylinder-symmetric trap. In addition to the monopole and quadrupole oscillation modes, we also discuss the radial quadrupole mode. We find that the latter acquires a quantum correction exclusively due to the dipole-dipole interaction. As a result, we identify the radial quadrupole as a reasonably accessible source for the signature of dipolar many-body effects and stress the enhancing character that dipolar interactions have for quantum fluctuations in the other oscillation modes.Comment: Version published in PR
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