Data/hora: 10/06/2024 00:48:17

Provedor de dados: | 52
País: | Brazil
Título: | Molluscicidal activity of crown of Christ (Euphorbia splendens var. hislopii) (Euphorbiaceae) latex submitted to pH variation
Autores: | Vasconcellos,Maurício Carvalho; Santos,José Augusto Albuquerque dos; Silva,Ivonise Paz da; Lopes,Fátima Eliana Ferreira; Schall,Virgínia Torres.
Data: | 2003-06-01
Ano: | 2003
Palavras-chave: | Euphorbia splendens var. hislopii; Molluscicidal activity; PH variation; Biomphalaria sp.; Bulinus sp.
Resumo: | Laboratory and field bioassays have confirmed the specificity of the molluscicidal activity of the Euphorbia splendens var. hislopii latex (crown of Christ) (Euphorbiaceae) over snails of the species Biomphalaria glabrata, B. tenagophila, B. straminea, B. pfeifferi and Bulinus sp. in the control of Schistosoma mansoni. In the present study, the effect of the pH variation on lethal concentration (LC90) over B. tenagophila was evaluated. Bioassays with the aqueous solutions of the latex ranging from 0.4 to 12 µl/l were adjusted for pH of 5.0; 6.0; 7.0 and 8.0, and tested in accordance with methods standardized by World Health Organization. The results obtained indicated that the minor concentration of the latex occurred at pH 6.0 (LC90 = 3.2 µl/l) and the maximum at pH 8.0 (LC90 = 10.3 µl/l). Lethal concentrations adjusted for pH 5.0 and 7.0 were 3.4 µl/l and 4,7µl/l, respectively. From the results it could be concluded that the molluscicidal toxicity was not altered when the concentrations were adjusted for pH 5.0 and 6.0, as we observed that mortality rate was 100% starting at a concentration of 2.0 µl/l, not the same for the concentrations with adjustment for pH 7.0 and 8.0.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000300013
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132003000300013
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.46 n.3 2003
Fonte: | info:eu-repo/semantics/openAccess