Dissertação para obtenção do Grau de Mestre em Engenharia da Soldadura ; Os processos de soldadura por fusão são dos processos mais utilizados na indústria metalomecânica para a ligação de materiais. Estes processos de soldadura libertam fumos, que são uma mistura de partículas sólidas e gases. Mais de 90 % dos fumos gerados são devidos à vaporização dos constituintes presentes nos consumíveis. Quanto menor fo...
Numa época em que há um interesse crescente no meio ambiente e na sua preservação, é cada vez mais importante apostar nas energias verdes e nas vantagens que elas podem trazer. Esta dissertação tem como principal objectivo dar o primeiro passo na construção de um carro eléctrico puro. Para isso desenvolveu-se um protótipo de um controlador para motores BLDC, com capacidade de travagem regenerativa. Para realiza...
A investigação foi organizada em três capítulos. O primeiro capítulo corresponde à análise teórica da temática da inserção dos imigrantes e das minorias étnicas essencialmente com base numa análise bibliográfica. Procurou-se, por um lado, apresentar os modelos teóricos mais frequentemente adoptados pelos Estados face à imigração e, por outro, identificar os principais tipos de factores que intervêm no processo ...
The union of different genomes in the same nucleus frequently results in hybrid genotypes with improved genome plasticity related to both genome remodeling events and changes in gene expression. Most modern cereal crops are polyploid species. Triticale, synthesized by the cross between wheat and rye, constitutes an excellent model to study polyploidization functional implications. We intend to attain a deeper k...
Doutoramento em Biologia - Instituto Superior de Agronomia ; Polyploidization is a remarkable driving force in plant evolution, where hybridization and chromosome doubling result in huge genomic stress. Deeper knowledge about parental genomes behaviour in a hybrid nucleus and on processes underlying genetic and epigenetic modifications induced by polyploidization is essential to understand such evolutive proce...
Review ; Polyploidization is one of the major driving forces in plant evolution and is extremely relevant to speciation and diversity creation. Polyploidization leads to a myriad of genetic and epigenetic alterations that ultimately generate plants and species with increased genome plasticity. Polyploids are the result of the fusion of two or more genomes into the same nucleus and can be classified as allopoly...
Abstract Genetic and epigenetic modifications resulting from different genomes adjusting to a common nuclear environment have been observed in polyploids. Sequence restructuring within genomes involving retrotransposon/ microsatellite-rich regions has been reported in triticale. The present study uses inter-retrotransposon amplified polymorphisms (IRAP) and retrotransposon microsatellite amplified polymorphisms...
Background. Polyploidization is a major evolutionary process in plants where hybridization and chromosome doubling induce enormous genomic stress and can generate genetic and epigenetic modifications. However, proper evaluation of DNA sequence restructuring events and the precise characterization of sequences involved are still sparse. Methodology/Principal Findings. Inter Retrotransposons Amplified Polymorphis...
Background: Chromatin organizational and topological plasticity, and its functions in gene expression regulation, have been strongly revealed by the analysis of nucleolar dominance in hybrids and polyploids where one parental set of ribosomal RNA (rDNA) genes that are clustered in nucleolar organizing regions (NORs), is rendered silent by epigenetic pathways and heterochromatization. However, information on the...
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