Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/919
Título: Inositol pentaphosphate in the erythrocytes of an Amazon fish, the pirarucu (Arapaima gigas)
Autor(es): Adalberto Luis Val
Elizabeth Gusmão Affonso
Roberto Huet de Salvo Souza
Vera Maria Fonseca de Almeida e Val
Márcia Alves Ferreira de Moura
Assunto: Amazônia
Metabolismo Respiratório
Ontogenia
ISSN: 0008-4301
Revista: Canadian Journal of Zoology
Volume: 70
Resumo: During the Alpha Helix expeditions to the rivers of the Amazon basin, inositol pentaphosphate (IPP) was detected in the erythrocytes of Arapaima gigas. We analyzed the intraerythrocytic phosphate levels of A. gigas specimens during the first year of life in captivity. IPP increased slowly during the first year, stabilizing at around 7 mM when the animals reached 1–1.5 m in length. ATP and GTP concentrations decreased in parallel. Wild animals within the same size range showed similar intraerythrocytic IPP levels. These changes represent qualitative and quantitative adjustments of the principal modulators of haemoglobin–oxygen affinity in the erythrocytes of A. gigas. These temporal changes seem to play an important physiological role, since this species changes its respiratory habit from aquatic respiration to obligatory air breathing, when it uses a modified swim bladder.
URI: http://repositorio.inpa.gov.br/handle/123/919
ISSN: 0008-4301
DOI: https://dx.doi.org/10.1139/z92-121
Local de publicação: Canadá
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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