RESUMO
The aim of this study was to evaluate the impact of the herbicide mixture nicosulfuron + atrazine, with or without the insecticide chlorpyrifos, onto soil entomofauna under maize crop. The treatments, applied 25 days after maize emergence, were represented by a weeded control without insecticide and herbicide, a weeded control with chlorpyrifos, and mixtures of nicosulfuron + atrazine, with or without chlorpyrifos. Arthropods populations, on the soil surface, as well as inside the soil under maize, were principally represented by mites (Arachnida: Acari), decomposer collembolans (Hexapoda:Parainsecta:Collembola) and predator ants (Hymenoptera:Formicidae). The nicosulfuron + atrazine mixture with chlorpyrifos and the isolated chlorpyrifos reduced the population dynamics of all insect groups on the soil surface compared to the weeded control. In the soil, mite and ant populations were reduced after application of the herbicide mixture with chlorpyrifos and of the isolated chlorpyrifos.
Assuntos
Atrazina/intoxicação , Clorpirifos/intoxicação , Herbicidas/intoxicação , Insetos/crescimento & desenvolvimento , Piridinas/intoxicação , Poluentes do Solo/intoxicação , Compostos de Sulfonilureia/intoxicação , Animais , Interações Medicamentosas , Cadeia Alimentar , Ácaros/crescimento & desenvolvimento , Dinâmica Populacional , Zea maysRESUMO
A rural-area resident male patient deliberately ingested chlorpiriphos, an organophosphate insecticide. Although presented with cholinergic symptoms initially, he suffered general condition deterioration after 4 d characterized by muscular weakness, hypotonia, arreflexia and recumbent dyspnea requiring ventilatory support. These clinical manifestations occur from liposoluble organophosphates or metabolites with long-lasting half time, causeing delayed inhibition of acetylcholinesterase and subsequent burn out of the neuromuscular junction from acetylcholine overstimulation.
Assuntos
Clorpirifos/intoxicação , Inseticidas/intoxicação , Hipotonia Muscular/induzido quimicamente , Tentativa de Suicídio , Adulto , Carvão Vegetal/uso terapêutico , Colinesterases/sangue , Humanos , Masculino , Hipotonia Muscular/fisiopatologia , Hipotonia Muscular/terapia , Resultado do TratamentoRESUMO
Life-threatening organophosphate-induced delayed polyneuropathy with transient bilateral vocal cord paralysis occurred in a 3-year-old child. Recovery was slow after prolonged ventilatory support. Patients who recover from serious organophosphate intoxications should be closely monitored for the development of organophosphate-induced delayed polyneuropathy.