Teste Repositóri
2014-01-01
Resultados de pesquisa
Foram encontrados 184 registos.
Dissertação de mestrado em Engenharia Industrial
This trial was undertaken to determine the effect of the rearing system (intensive vs. extensive) over the content of antioxidants (alpha-tocopherol) in the meat of Alentejano pigs. Sixteen Alentejano pigs with an average body weight (BW) of 60 kg were divided in two groups: Group I (n=10) was allocated in open-air individual pens, while Group II (n=6) was maintained in a 3 ha natural pasture. Both groups were fed a commercial diet (3100 kcal ED, 14% CP, and 20 mg/kg alpha-tocopherol) at 85% ad libitum. All pigs were killed at 100 kg BW and carcasses were refrigerated (24 h at 4ºC). Samples of semimembranosus muscle were obtained, stored under vacuum, and frozen (-30ºC) until analysis. The content in alpha-tocopherol was estimated by HPLC. Results show a significant effect (P<0.001) on the semimembranosus content of alpha-tocopherol. G...
The present work studied the evolution of fatty acid composition in the dorsal subcutaneous fat of free-range Alentejano pigs fed on pasture and acorns. Twenty pigs with a body weight (BW) of ~90 kg were placed in a 2 ha pasture (Lolium westerwoldium and Trifolium incarnatum) and fed daily with 4 kg of acorns. Animals were submitted to biopsies near tail insertion with ~90, ~100, and at slaughter, ~110 kg BW. The fat samples obtained were analysed by GC/FID to determine the fatty acid composition. An increase of only 20 kg body mass based on pasture and acorn consumption led to: (i) carcasses with C18:1 content similar to the minimal value stipulated by market demands for Alentejano pigs bred in free-range conditions; and (ii) contents of C16:0 and C18:0 were within the limits for the carcass-quality assessment. Nevertheless, the conte...
The effect of PEG treated or untreated acorns fed to Alentejano pigs, on the protein
output of the animals were studied. The animals had access to two sown pasture fields based on Trifolium incarnatum and Lolium westerwoldicum. Four dietary treatments were tested with 5 pigs per
treatment in a two by two factorial experimental design (factor 1: sown species; factor 2: acorn with or without PEG). Intake of acorns and protein faecal concentration were measured individually. Faecal output was estimated using an external faecal marker (dotriacontane, C32). Crude protein faecal concentration of animals fed acorns treated with PEG was significantly lower
(P<0,05) then those fed untreated acorns, suggesting that the PEG may have increased the availability of dietary protein to the animals. However, the estimation of protein faecal output usin...
Dissertação de mestrado em Estatística de Sistemas - Perfil Engenharia e
Estatística
Relatório de estágio de mestrado em Estatística de Sistemas, Perfil Engenharia e Estatística (MES-EE)
Dissertação de mestrado integrado em Engenharia Civil (área de especialização em Perfil de Estruturas e Geotecnia)
Programa Doutoral em Engenharia Industrial e Sistemas
1. Introduction: generalities on iron homeostasis
1.1 systemic iron metabolism
1.2 cellular iron metabolism
1.3 key iron metabolism-related molecules
2. Iron metabolism and immune system
2.1. The classical view
2.2. A revolutionary approach
3. Iron, immune cells and pathology
3.1 the molecular and cellular immunology group: Clinical models to study iron metabolism and Immune system in non communicable diseases
3.2 alzheimer’s disease as an example of iron Metabolism homeostasis disruption
Nesta dissertação, as duas abordagens evolucionárias mais conhecidas e frequentemente aplicadas a problemas de optimização são consideradas: as Estratégias Evolutivas e os Algoritmos Genéticos. Estas abordagens apresentam como principal desvantagem tempos de computação elevados mas, por outro lado, exibem uma grande flexibilidade na modulação de problemas de engenharia. As vantagens e os inconvenientes de cada uma das abordagens para diferentes tipos de problemas de optimização foram investigadas, nomeadamente ao nível da representação do espaço das soluções e no tratamento das restrições. Usualmente, em engenharia, os problemas são formulados com um único objectivo, em geral, o custo. Contudo, podem existir outros objectivos que, quando considerados, transformam o problema em optimização multi-objectivo. Nesta classe de problemas, em ...
