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RESUMO Os autores descrevem uma nova espécie de Diptera-Simuliidae, o Simulium mutucuna, de material coligido no Território Federal de Roraima, no trecho da estrada BR-174, localidade denominada Campinho, próximo à fronteira com a Venezuela. Embora procurassem formas imaturas em riachos próximos, somente um adulto foi capturado atacando dentro da mata.

This study evaluated the linear dimensional change of two dental plasters (plaster type 4 Elite rock and plaster modified with carbon nanotubes) a PU resin (Novox) and an epoxy resin (Sikadur 32). An aluminum matrix was made to create 20 specimens for each material analyzed. The measurements were performed using SEM with differences expressed in terms of linear dimensional change. Tukey test showed that polyurethane resin had significantly greater shrinkage than plaster type 4 and nanoparticulate plaster. Polyurethane resin shrinkage was also significantly higher than that measured for the epoxy resin, though both were poor at reproducing the original cone measurements. In relation to plaster type 4, nanoparticulate plaster and epoxy resin, polyurethane resin shrinkage was 165%, 101% and 52% higher, respectively. No significant difference was observed between the tested plasters and epoxy resin regarding dimensional changes.