998 resultados para Virchow, Rudolf, 1821-1902


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O presente estudo examina o momento fundador da imprensa no Brasil em 1808 e a rotina de funcionamento da Impressão Régia, no Rio de Janeiro, entre 1808 e 1821. Qual era sua estrutura administrativa, sua ordem de despesas, a natureza das ocupações funcionais, enfim, qual era a lógica de funcionamento da casa impressora oficial da Corte no início do Oitocentos? Qual o lugar ocupado pelos impressos naquele contexto?Para melhor compreender a estrutura, a rotina administrativa e de funcionamento da Impressão Régia no Rio de Janeiro, mas, principalmente, os usos e funções da régia tipografia no momento de seu estabelecimento por iniciativa do príncipe regente d. João, foi analisada também parte de sua produção, qual seja, os títulos dedicados às Ciências e às Artes. A partir desses livros, localizados no acervo da Biblioteca Nacional do Rio de Janeiro e na Biblioteca Guita e José Mindlin, em São Paulo, foram estudadas as características biobibliográficas de seus autores e a relação dos mesmos com o poder oficial.Foi possível identificar que os autores dos títulos examinados eram herdeiros da tradição ilustrada portuguesa. Partilhando de uma mesma cultura política, possuíam laços estreitos com membros da Corte, prestando obediência ao príncipe, sendo alguns autores, inclusive, integrantes da junta diretora da Impressão Régia.Assim, além da rotina e funcionamento da casa impressora da Corte, no Rio de Janeiro de d. João, o presente trabalho examina tomando como fonte de análise sua produção editorial no campo das Ciências e das Artes a formação da cultura científica do período Joanino e a rede de sociabilidades existente no Rio de Janeiro, entre 1808 e 1821.

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Charles Henry Gilbert (1859-1928) was a pioneering ichthyologist who made major contributions to the study of fishes of the American West. As chairman of the Department ofZoology at Leland Stanford Junior University in Palo Alto, Calif., during 1891-1925, Gilbert was extremely devoted to his work and showed little patience with those ofa different mindset. While serving as Naturalist-in-Charge of the U.S. Fish Commission Steamer Albatross during her exploratory expedition to the Hawaiian Islands in 1902, Gilbert engaged in an acrimonious feud with the ship's captain, Chauncey Thomas, Jr. (1850-1919), U.S.N., over what Gilbert perceived to be an inadequate effort by the captain. This essay focuses on the conflict between two strong figures, each operatingf rom different world views, and each vying for authority. Despite the difficulties these two men faced, the voyage of the Albatross in 1902 must be considered a success, as reflected by the extensive biological samples collected, the many new species of animals discovered, and the resulting publication of important scientific papers.

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Tilapia nilotica is commercially very important throughout the Ethiopian region including the major rivers in West Africa, the Chad basin, the Nile and its associated lakes. The Tilapia fishery of Lake Rudolf is at present small, but potentially important, particularly on the eastern shores of the lake where fishing intensity is low. Preliminary results from observations on the feeding of Tilapia nilotica in Lake Rudolf are presented. The fish exhibit a regular diurnal feeding rhythm, commencing between 05.00 hours and 08.00 hours and ceasing between 14.00 hours and 18.00 hours. The largest fish appear to feed longer. Quantitative estimates of the daily food intake indicate less material to be ingested than by populations in other lakes. The lysis of algae, intestinal pH and food material are also investigated.

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This paper includes a short report on preliminary midwater hauls with a frame trawl. The object is (a) to study the relationship between the vertical distribution of pelagic fish and the scattering layer, and (b) to find out if certain species, which at times occur abundantly in the bottom-trawl on the shallow-water frontiers of the scattering layer, might extend into offshore waters to constitute an important pelagic resource.

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Communication is important for social and other behavioural interactions in most marine mammal species. The bottlenose dolphin (Tursiops truncatus, Montagu, 1821) is a highly social species that use whistles as communication calls to express identity and to initiate and maintain contact between socially interactive individuals. In this thesis, the degree of variability in whistle behaviour and whistle characteristics was examined between different habitats on a range of spatial scales. The whistle characteristics that best discriminated between different communities were investigated, along with exploration of whistle variation in relation to habitat type, levels of social interaction and relatedness. Finally, the use and variability of individually distinctive calls (signature whistles) within and between Irish and US waters were also examined. Relatively high levels of whistle variation were found within a genetically and socially isolated population of dolphins in the Shannon Estuary, reflecting the need for individual identification and distinctive whistles in a population with long term site fidelity and high levels of social cohesion. Variation between reproductively separate communities in Irish waters was relatively small except between animals in inshore compared with continental shelf waters. The greatest differences in whistle structure overall were evident between dolphins using inshore and offshore US waters, likely reflecting social isolation of the two distinct ecotypes that occur in these waters but also variation in behaviour or habitat conditions. Variation found among inshore communities in US waters reflected similarities in habitat use and levels of social interaction. These findings suggest that vocal variation is socially mediated, behaviourally maintained and dependent on levels of social contact between individuals. The findings contribute to our understanding of the interaction of factors influencing vocalisation behaviour in this behaviourally complex and ecologically plastic species.

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Section 1. The Brixham fishing-grounds and fishery statistics. Section 2. Distribution and migrations of food-fishes. Section 3. The reproduction of the flat-fishes. Appendix 1. Preliminary Report on the Trawling Experiments in the Bays on the South Coast of Devon.

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