909 research outputs found

    Apparent digestibility of conventional and alternative feedstuffs by hybrid tambacu juveniles.

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    Abstract: The apparent digestibility coefficients (ADC's) of dry matter (DM), crude protein (CP), and gross energy (GE) of conventional feedstuffs (cottonseed meal-CSM, soybean meal-SBM, wheat bran-WHB, corn-COR) and regional alternative feedstuffs (common bean residue meal-CBR, mesquite meal-MES, pasta by-product meal-PBM) were determined for hybrid juvenile tambacu Colossoma macropomum × Piaractus mesopotamicus. The apparent DM and GE digestibility of feedstuffs decreased (p0.05) were found among ADC's of PBM and COR. The lowest CP ADC among energy sources was observed in MES; the lowest CP ADC among plant protein sources was observed in CBR. Information about the ADC's of conventional and alternative feedstuffs for tambacu is essential to formulate low-cost diets and can contribute to regional development

    Scaling Relations for Collision-less Dark Matter Turbulence

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    Many scaling relations are observed for self-gravitating systems in the universe. We explore the consistent understanding of them from a simple principle based on the proposal that the collision-less dark matter fluid terns into a turbulent state, i.e. dark turbulence, after crossing the caustic surface in the non-linear stage. The dark turbulence will not eddy dominant reflecting the collision-less property. After deriving Kolmogorov scaling laws from Navier-Stokes equation by the method similar to the one for Smoluchowski coagulation equation, we apply this to several observations such as the scale-dependent velocity dispersion, mass-luminosity ratio, magnetic fields, and mass-angular momentum relation, power spectrum of density fluctuations. They all point the concordant value for the constant energy flow per mass: 0.3cm2/sec30.3 cm^2/sec^3, which may be understood as the speed of the hierarchical coalescence process in the cosmic structure formation.Comment: 26 pages, 6 figure

    Variações no teor de umidade e caracterização de sementes e frutos de castanheira-do-brasil em itaúba, mato grosso

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    A castanheira-do-brasil (Bertholletia excelsa) pertence à família Lecythidaceae, é uma espécie florestal muito importante de exploração extrativista, possuindo sementes com alto valor nutricional e comercial e com variadas aplicações e mercado consumidor (MULLER et al., 1995). A castanheira é uma árvore de grande porte, podendo atingir 50 m de altura. Possui tronco retilíneo, cilíndrico e não possui galhos até a copa. Seu fruto é um pixídio lenhoso, que acomoda entre 10 à 25 amêndoas (sementes). Seu florescimento é anual e seus frutos desenvolvem-se no tempo de 14 a 15 meses, porém há uma carência de estudos que comprovem o real tempo de formação. A queda dos frutos geralmente acontece de outubro a fevereiro, dependendo da região, podendo ocorrer quedas tardias no mês de março (BORÉM et al.,2009). Um dos grandes problemas da exploração extrativista da castanha-do-brasil está no sistema de coleta empregado, devido às questões de contaminação por bactérias e fungos, principalmente os produtores de aflatoxina (BORÉM et al.,2009). Após a coleta, os ouriços muitas vezes são armazenados de forma indevida, sendo depositados em locais descobertos e em contado direto com o solo, propiciando a entrada de água no fruto. Dessa forma, o teor de umidade presente no fruto é elevado, beneficiando o desenvolvimento dos microrganismos e prejudicando a qualidade das sementes (SOUZA et al., 2004). O objetivo deste trabalho foi caracterizar frutos e sementes de castanheira-do-brasil coletados em floresta nativa no município de Itaúba, Mato Grosso, e quantificar a umidade destes no momento da coleta

    The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies

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    Using the stellar kinematic maps and ancillary imaging data from the Sydney AAO Multi Integral field (SAMI) Galaxy Survey, the intrinsic shape of kinematically-selected samples of galaxies is inferred. We implement an efficient and optimised algorithm to fit the intrinsic shape of galaxies using an established method to simultaneously invert the distributions of apparent ellipticities and kinematic misalignments. The algorithm output compares favourably with previous studies of the intrinsic shape of galaxies based on imaging alone and our re-analysis of the ATLAS3D data. Our results indicate that most galaxies are oblate axisymmetric. We show empirically that the intrinsic shape of galaxies varies as a function of their rotational support as measured by the "spin" parameter proxy Lambda_Re. In particular, low spin systems have a higher occurrence of triaxiality, while high spin systems are more intrinsically flattened and axisymmetric. The intrinsic shape of galaxies is linked to their formation and merger histories. Galaxies with high spin values have intrinsic shapes consistent with dissipational minor mergers, while the intrinsic shape of low-spin systems is consistent with dissipationless multi-merger assembly histories. This range in assembly histories inferred from intrinsic shapes is broadly consistent with expectations from cosmological simulations.Comment: 15 pages, 11 figures, MNRAS in prin

    The SHOX gene and the short stature. Roundtable on diagnosis and treatment of short stature due to SHOX haploinsufficiency: How genetics, radiology and anthropometry can help the pediatrician in the diagnostic process padova (April 20th, 2011)

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    The growth of the human body depends from a complex interaction between nutritional, environmental and hormonal factors and by a large number of different genes. One of these genes, short stature homeobox (SHOX), is believed to play a major role in growth. SHOX haploinsufficiency is associated with a wide spectrum of conditions, all characterized growth failure such as Leri-Weill dyschondrosteosis , Turner syndrome, short stature with subtle auxological and radiological findings and the so called “idiopathic short stature” (short stature with no specific findings other than growth failure). The document was prepared by a multidisciplinary team (paediatric endocrinologists, paediatrician, radiologist, geneticist and epidemiologist) to focus on the investigation of children with suspected SHOX- deficiency (SHOX-D) for an early identification and a correct diagnostic work - up of this genetic disorder. On the basis of a number of screening studies, SHOX-D appears to be a relatively frequent cause of short stature. The following recommendations were suggested by our multidisciplinary team: (i) a careful family history, measurements of body proportions and detection of any dysmorphic features are important for the suspect of a genetic disorder ,(ii)the presence of any combination of the following physical findings, such as reduced arm span/ height ratio, increased sitting height/height ratio, above average BMI, Madelung deformity, cubitus valgus, short or bowed forearm, dislocation of the ulna at the elbow, or the appearance of muscular hypertrophy, should prompt the clinician to obtain a molecular analysis of the SHOX region, (iii) it is of practical importance to recognise early or mild signs of Madelung deformity on hand and wrist radiographs, (iv) growth hormone ,after stimulation test, is usually normal . However, treatment with rhGH may improve final adult height; the efficacy of treatment is similar to that observed in those treated for Turner syndrome
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