41 research outputs found
Displasia renal em um bezerro Limousin
Descreve-se um caso de displasia renal em um bezerro Limousin, macho, de quatro meses. O animal apresentava perda de peso, baixa taxa de crescimento, anorexia, apatia, diarrĂ©ia escura fĂ©tida e uremia, sem melhora apesar de tratamento. O bezerro foi sacrificado para interromper o sofrimento adicional e submetido Ă necropsia. Ao exame foi observado que os rins estavam pequenos, firmes, pĂĄlidos e com superfĂcie rugosa. A cĂĄpsula estava aderida Ă uma superfĂcie subcapsular irregular. O cĂłrtex tinha aparĂȘncia difusamente pĂĄlida e fibrosa e apresentava mĂșltiplos focos brancos de fibrose. A junção cĂłrtico-medular estava indistinta. O exame histologico dos rins revelou mĂșltiplos glomĂ©rulos imaturos com nĂșcleo perifĂ©rico, capilares inaparentes e padrĂŁo arbĂłreo. O cĂłrtex renal apresentou tĂșbulos primitivos com epitĂ©lio cubĂłide ou cilĂndrico envolvido por mesĂȘnquima corado somente pelo alcian blue e nĂŁo pelo tricrĂŽmico de Masson. Foi tambĂ©m observada leve fibrose intersticial na medula renal. Os rins mostravam estruturas em estĂĄgio inapropriado de desenvolvimento ou anĂŽmalas
Wear and surface residual stress evolution on twin-disc tests of rail/wheel steels
Twin disc tribological tests were performed in wheel and rail materials, with specimens
taken from a Spanish AVE train wheel and a UIC60 rail, in a program intended to characterize their
contact fatigue behavior. The X-ray diffraction technique was used to characterize the residual stress
distribution at the initial and damaged stages, as well as in intermediate stages, since existing
residual stresses in the surface layers of the railways steels and its evolution during contact loading
can have a major influence on crack initiation and propagation
Produtividade do milho irrigado em sucessão a espécies invernais para produção de palha e grãos
ATLANTIC BIRDS: a data set of bird species from the Brazilian Atlantic Forest
South America holds 30% of the world's avifauna, with the Atlantic Forest representing one of the richest regions of the Neotropics. Here we have compiled a data set on Brazilian Atlantic Forest bird occurrence (150,423) and abundance samples (N = 832 bird species; 33,119 bird individuals) using multiple methods, including qualitative surveys, mist nets, point counts, and line transects). We used four main sources of data: museum collections, on-line databases, literature sources, and unpublished reports. The data set comprises 4,122 localities and data from 1815 to 2017. Most studies were conducted in the Florestas de Interior (1,510 localities) and Serra do Mar (1,280 localities) biogeographic sub-regions. Considering the three main quantitative methods (mist net, point count, and line transect), we compiled abundance data for 745 species in 576 communities. In the data set, the most frequent species were Basileuterus culicivorus, Cyclaris gujanensis, and Conophaga lineata. There were 71 singletons, such as Lipaugus conditus and Calyptura cristata. We suggest that this small number of records reinforces the critical situation of these taxa in the Atlantic Forest. The information provided in this data set can be used for macroecological studies and to foster conservation strategies in this biodiversity hotspot. No copyright restrictions are associated with the data set. Please cite this Data Paper if data are used in publications and teaching events. © 2017 by the Ecological Society of Americ