Effects of deltamethrin pyrethroid on the respiratory metabolism of the neotropical spirostreptid millipedes Gymnostreptus olivaceus and Plusioporus setiger
Rev. bras. toxicol
; 17(2): 25-28, dez. 2004. ilus
Article
em En
| LILACS
| ID: lil-404061
Biblioteca responsável:
BR275.1
ABSTRACT
The effects of deltamethrin on the respiratory metabolism of Gymnostreptus olivaceus and Plusioporus setiger were investigated. Acetone solutions corresponding to half the LD50 values, i.e., 20 mg.g-1 for G. olivaceus and 4.40 mg.g-1 for P. setiger, were used. Metabolism was determined with a Warburg respirometer at 25ºC. Respirometric measurements were performed 1, 3 and 6 hours after administration of the pyrethroid to the same groups of millipedes. After 24 hours, daily respirometric measurements lasting 1 hour each were made on different millipede groups for a period of 10 days. Significant differences were detected only between the groups treated with the pyrethroid and the two control groups. In G. olivaceus, respiratory rates increased by about 1.65-fold compared to normal immediately after administration of the pyrethroid, followed by a gradual decrease up to 72 hours and a return to normal levels thereafter. In P. setiger the increase was about 1.1-fold compared to normal, with a decrease up to 96 hours and a return to normal thereafter. Although increased oxygen consumption was observed, a detoxification process occurred in both species, so that the possible metabolism of the pyrethroid may justify the low toxicity of deltamethrin for G. olivaceus and P. setiger
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Base de dados:
LILACS
Assunto principal:
Piretrinas
/
Oniscus asellus
/
Diplomonadida
/
Exposição a Praguicidas
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article