Data/hora: 10/06/2024 12:01:50

Provedor de dados: 	104	
País: 	Brazil	
Título: 	Paraoxonase activity in sera from Piaractus mesopotamicus Holmberg (Characidae) and Hypostomus punctatus Valenciennes (Siluridae)	
Autores: 	Bastos,Vera Lucia F. Cunha; Rossini,Ana; Alves,Marcelo V; Ceccarelli,Paulo S; de Lima,José A. Ferraz; Bastos,Jayme Cunha.	
Data: 	1998-01-01	
Ano: 	1998	
Palavras-chave: 	Detoxication; Fish; Organophosphate; Serum esterases.	
Resumo: 	A paraoxonase activity present in serum of two Brazilian fish species was consistently assayed at pH 8.5 using 7.5 mM paraoxon final concentration. The paraoxonase activity was more activated by 0.5 M NaCl in serum of Piaractus mesopotanricus Holmberg, 1887 (pacu) than in serum of Hypostomus punctatus Valenciennes, 1840 (cascudo). Apparent values of K M were 3.3 x 10-3 M for cascudo and pacu paraoxonase activity in the presence of 0.5 M NaCl. Apparent maximum velocity values calculated in the presence of 0.5 M NaCl were 6.1 and 6.5 nmole/min/mL of serum for cascudo and pacu, respectively. Vmax/K M ratio values of determinations in the presence and absence of 0.5 M NaCl showed that NaCl had a more evident effect on increasing the affinity of serum paraoxonase for paraoxon in pacu serum. Young specimens of pacu showed a marked decreased paraoxonase serum activity when kept in tanks treated with 0.25 ppm methyl-parathion.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000300011	
Editor: 	Sociedade Brasileira de Zoologia	
Relação: 	10.1590/S0101-81751998000300011	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zoologia  v.15 n.3 1998	
Fonte: 	info:eu-repo/semantics/openAccess