RESUMO
Iron oxide nanoparticles were stabilized using poly acrylic acid (PAA) to yield stabilized slurry of Iron oxide nanoparticles. A two-dimensional physical model filled by glass beads was used to study the fate and transport of the iron oxide nanoparticles stabilized with PAA in porous media under saturated, steady-state flow conditions. Transport data for a nonreactive tracer, slurry of iron oxide nanoparticles stabilized with PAA were collected under similar flow conditions. The results show that low concentration slurry of iron oxide nanoparticles stabilized with PAA can be transported like a tracer without significant retardation. The image processing technique was employed to measure the tracer/nanoparticle concentration inside the 2-D model filled with glass beads. The groundwater flow model, Visual MODFLOW, was used to model the observed transport patterns through MT3DMS module. Finally, it was demonstrated that the numerical model MODFLOW can be used to predict the fate and transport characteristics of nanoparticles stabilized with PAA in groundwater aquifers.
Assuntos
Compostos Férricos/química , Processamento de Imagem Assistida por Computador/métodos , Nanopartículas Metálicas/análise , Resinas Acrílicas/química , Simulação por Computador , Compostos Férricos/análise , Água Subterrânea , Hidrologia/métodos , Nanopartículas Metálicas/química , Modelos Teóricos , Porosidade , Poluentes Químicos da Água/análise , Poluentes Químicos da Água/químicaRESUMO
AIM: Epilepsy is one of the most common neurologic problems worldwide. A relationship between epilepsy and hormones has been demonstrated. This study was designed to investigate the effect of seizure on blood ghrelin level. METHODS: Twenty male Wistar rats were divided into two groups. The control group received saline and the pentylenetetrazole (PTZ) group received a single convulsive dose (50mg/kg) of PTZ. Thirty minutes later blood samples were collected and acylated and unacylated ghrelin levels in the plasma were assayed. RESULTS: Acylated or active form of ghrelin decreased significantly (p<0.05) after a PTZ-induced seizure, but the reduction of unacylated and total blood ghrelin levels failed to reach statistical significance. CONCLUSION: These findings may reflect that PTZ-induced epilepsy decreases AG of plasma.