Consulta: creatorFacets:"Almeida-Val,Vera Maria Fonseca de"
Registros recuperados: 3
Data/hora: 09/06/2024 14:46:31

Ecophysiology, genotoxicity, histopathology, and gene responses of naphthalene injected Colossoma macropomum (Cuvier, 1818) exposed to hypoxia
Provedor de dados: 74
Autores: Souza,Samara Silva de; Silva,Grazyelle Sebrenski da; Almeida-Val,Vera Maria Fonseca de.
Abstract The present study aimed to evaluate the biological responses of Colossoma macropomum to naphthalene injection and subsequent hypoxia exposure, emphasizing the expression of the tumor suppressor gene tp53. Tambaquis were intraperitoneally injected with naphthalene (50 mg/kg) and, after 96 hours, the fish were transferred to respirometry chambers and, submitted to progressive hypoxia for the determination of critical PO2. In a subsequent experiment, the fish received an intraperitoneal injection of naphthalene and were kept for 96 hours under normoxia. Successively, fish were challenged with acute hypoxia (PO2&lt;PO2 crit) during 6 hours. We observed that the PO2 crit was not affected by naphthalene injection. Moreover, hematological parameters were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Naphthalene; Hypoxia; Tumor suppressor gene tp53; DNA damage; Tambaqui.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000300411

Differential survivorship of congeneric ornamental fishes under forecasted climate changes are related to anaerobic potential
Provedor de dados: 74
Autores: Gonçalves,Luciana Mara Fé; Silva,Maria de Nazaré Paula da; Val,Adalberto Luis; Almeida-Val,Vera Maria Fonseca de.
Abstract Two Amazonian closely related tetras – cardinal Paracheirodon axelrodi and green neon P. simulans – were artificially acclimatized to environmental chambers mimicking future climate change scenarios (mild, moderate and extreme), using a microcosm facility. P. simulans survived (100%) to all scenarios after 30 days exposure, while P. axelrodi presented decreasing survival percentages according to environmental severity. These differences may be the reflection of distinct natural acclimatization to microhabitats between the species, which differ in thermal conditions. Survival responses might be related to differences in relative gene expression of lactate dehydrogenase (Ldh), suggesting that P. axelrodi anaerobic potential is lower or non-existent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ornamental fish; Enzyme activity; Relative gene expression; IPCC scenarios; Lactate Dehydrogenase (Ldh).
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000100107

Aspectos biológicos de peixes amazônicos. IV. Padrões eletroforéticos de hemoglobinas de 22 espécies coletadas na ilha da Marchantaria (Manaus - AM).
Provedor de dados: 36
Autores: Val,Adalberto Luís; Almeida-Val,Vera Maria Fonseca de; Monteiro,Plínio José Cavalcante.
Foram estudados hemolisados de 22 espécies de peixes coletados na Ilha da Marchantaria (rio Solimões, Manaus - AM), através de eletroforeses em gel de amido e gel de ágar-amido. Uma grande heterogeneidade hemoglobínica interespecífica foi detectada, a exemplo do observado para espécies de zona subtropical e temperada. A capacidade de resolução de dois suportes eletroforéticos é discutida. Os resultados são discutidos em função da possível adaptabilidade conferida pelos sistemas de múltiplas hemoglobinas.
Tipo: Info:eu-repo/semantics/article
Ano: 1986
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671986000100125