980 resultados para Contos portugueses - séc.20-21 - História e crítica


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A novel high performance bit parallel architecture to perform square root and division is proposed. Relevant VLSI design issues have been addressed. By employing redundant arithmetic and a semisystolic schedule, the throughput has been made independent of the size of the array.

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Aflatoxins are a family of fungal toxins that are carcinogenic to man and cause immunosuppression, cancer and growth reduction in animals. We conducted a cross-sectional study among 480 children (age 9 months to 5 years) across 4 agroecological zones (SS, NGS, SGS and CS) in Benin and Togo to identify the effect of aflatoxin exposure on child growth and assess the pattern of exposure. Prior reports on this study [Gong, Y.Y., Cardwell, K., Hounsa, A., Egal, S., Turner, Hall, A.J., Wild, C.P., 2002. Dietary aflatoxin exposure and impaired growth in young children from Benin and Togo: cross sectional study. British Medical Journal 325, 20-21, Gong, Y.Y., Egal, S., Hounsa, A., Turner, P.C., Hall, A.J., Cardwell, K., Wild, C.P., 2003. Determinants of aflatoxin exposure in young children from Benin and Togo, West Africa: the critical role of weaning and weaning foods. International Journal of Epidemiology, 32, 556-562] showed that aflatoxin exposure among these children is widespread (99%) and that growth faltering is associated with high blood aflatoxinalbumin adducts (AF-alb adducts), a measure of recent past exposure. The present report demonstrates that consumption of maize is an important source of aflatoxin exposure for the survey population. Higher AF-alb adducts were correlated with higher A. flavus (CFU) infestation of maize (p=0.006), higher aflatoxin contamination (ppb) of maize (p<0.0001) and higher consumption frequencies of maize (p=0.053). The likelihood of aflatoxin exposure from maize was particularly high in agro-ecological zones where the frequency of maize consumption (SGS and CS), the presence of allatoxin in maize (SGS) or the presence of A. flavus on maize (NGS and SGS) was relatively high. Socio-economic background did not affect the presence of A. flavus and aflatoxin in maize, but better maternal education was associated with lower frequencies of maize consumption among children from the northernmost agro-ecological zone (SS) (p=0.001). The impact of groundinit consumption on aflatoxin exposure was limited in this population. High AF-alb adduct levels were correlated with high prevalence of A. flavus and aflatoxin in groundinit, but significance was weak after adjustment for weaning status, agro-ecological zone and maternal socio-economic status (resp. p = 0.091 and p = 0.083). Ingestion of A. flavus and aflatoxin was high in certain agro-ecological zones (SS and SGS) and among the higher socio-economic strata due to higher frequencies of groundnut consumption. Contamination of groundnuts was similar across socio-economic and agroecological boundaries.

In conclusion, dietary exposure to aflatoxin from groundnut was less than from maize in young children from Benin and Togo. Intervention strategies that aim to reduce dietary exposure in this population need to focus on maize consumption in particular, but they should not ignore consumption of groundnuts. (c) 2005 Elsevier B.V. All rights reserved.

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Rotational moulding promises designers attractive economics and a low-pressure process. The benefits of rotational moulding are compared here with other manufacturing methods such as injection and blow moulding.

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O presente volume de estudos em homenagem ao Professor Hélio Osvaldo Alves é composto por duas partes. A primeira, com o título de ‘Testemunhos’, reúne as palavras com que amigos, colegas e discípulos recordaram a pessoa de Hélio Alves. A segunda parte, ‘Comunicações’, inclui os textos de carácter científico apresentados e debatidos no colóquio, realizado em Novembro de 2003. ‘O lago de todos os recursos’ é uma expressão que o Professor Hélio tomou de empréstimo a E. P. Thompson, e adaptou, para baptizar um dos seus estudos sobre a ideia de Cultura. Escolhemos esse título para o colóquio que deu origem a este volume por ele sugerir as infinitas possibilidades de estudo e análise que se contêm na palavra Cultura, bem como a diversidade de escolhas e aproximações que os estudos de Cultura proporcionam.

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Relatório de estágio de mestrado, Ciências da Documentação e Informação (Arquivistica), Universidade de Lisboa, Faculdade de Letras, 2010

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Tese de mestrado Arte, Património e Teoria do Restauro, Universidade de Lisboa, Faculdade de Letras

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Tese de doutoramento, História (História Medieval), Universidade de Lisboa, Faculdade de Letras, 2014

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Tese de doutoramento, História (História dos Descobrimentos e da Expansão), Universidade de Lisboa, Faculdade de Letras, 2014

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Tese de doutoramento, Estudos de Literatura e Cultura (Literatura Oral e Tradicional), Universidade de Lisboa, Faculdade de Letras, 2014

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Tese de doutoramento, Estudos de Literatura e de Cultura (Estudos Americanos), Universidade de Lisboa, Faculdade de Letras

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Tese de doutoramento, Estudos de Literatura e de Cultura (Estudos Comparatistas), Universidade de Lisboa, Faculdade de Letras, 2014

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Tese de doutoramento, Linguística (Linguística Aplicada), Universidade de Lisboa, Faculdade de Letras, 2015