Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Biol. Res. (2) Autor NOVOA,FRANCISCO F (2) OLIVARES,RICARDO (2) ATALA,CRISTIAN (1) CANALS M,MAURICIO (1) CANALS,MAURICIO (1) LABRA,FABIAN (1) ROSENMANN,MARIO (1) Mais... Palavra-chave Bronchial tree (1) Broncography (1) Fractals (1) Junction optimality (1) Lung (1) Ontogeny (1) Optimization (1) Mais... Tipo do documento Journal article (2) Ano 2002 (1) 2000 (1) País Chile (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus) Biol. Res. CANALS M,MAURICIO; ATALA,CRISTIAN; OLIVARES,RICARDO; NOVOA,FRANCISCO F; ROSENMANN,MARIO. We studied the departure from the physical optimality of the bronchial tree of rats using both i) the minimum volume and power and ii) the minimum surface and drag criteria, considering the bronchial junction as the unit study based on Zamir's model for vascular trees. Our results show deviations of the junctions of the bronchial tree from the expected optimums in the proximal airway that can be explained by both, the turbulent or transitional flow regime, and the airway's necessity to distribute its terminal branches in the alveolar surface filling the thoracic volume. The departures of the observed values at the optimum for the minimum volume and power were significantly different than the obtained departure values for the minimum surface and drag... Tipo: Journal article Palavras-chave: Lung; Junction optimality; Optimization; Broncography. Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300015 Ontogenetic changes in the fractal geometry of the bronchial tree in Rattus norvegicus Biol. Res. CANALS,MAURICIO; OLIVARES,RICARDO; LABRA,FABIAN; NOVOA,FRANCISCO F. Respiration and metabolism change dramatically over the course of the development of vertebrates. In mammals these changes may be ascribed to organogenesis and differentiation of structures involved in gas exchange and transport and the increase in size. Since young as well as mature individuals must be well-designed if the species is to survive, the physiological changes during the development should be matched with geometrical or structural adjustments of the respiratory system. The aim of this study was to evaluate changes in the fractal geometry of the bronchial tree during the postnatal development of the rat. The average fractal dimension of the bronchial tree of the rats was 1.587, but that of juveniles was larger than that of the adults. We found... Tipo: Journal article Palavras-chave: Bronchial tree; Fractals; Ontogeny. Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100010 Registros recuperados: 2 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco