RESUMO
The application of metallic nanoparticles improves the yield and content of bioactive compounds in plants. The aim of the present study was to determine the effects of the foliar application of copper nanoparticles (CuO-NPs) in the yield and content of bioactive compounds in lettuce. Different concentrations of CuO-NPs (0, 0.5, 1, 2, 4, and 6 mg mL-1) were applied in lettuce. The yield, nutraceutical quality, and enzymatic activity were determined. Foliar spraying of CuO-NPs induced an increase in the biosynthesis of bioactive compounds. In addition to an increase in the activity of the enzymes superoxide dismutase (SOD) and catalase (CAT) in lettuce plants, there were no negative effects on yield. Therefore, with the application of CuO-NPs, better quality lettuces are produced for the human diet due to the higher production of bioactive compounds.
RESUMO
Benefits of nanotechnology in agriculture include reduced fertilizer loss, improved seed germination rate and increased crops quality and yield. The objective of this research was to evaluate the effects of zinc oxide nanoparticles (ZnO-NPs), at 1500 ppm, on tomato (Solanum lycopersicum L.) growth. ZnO-NPs were synthetized to produce either spherical or hexagonal morphologies. In this research, we also studied two application methods (foliar and drench) and nanoparticles' (NPs) surface modification with maltodextrin. The results obtained indicate that ZnO-NP-treated tomato plants significantly increased plant height, stem diameter and plant organs (leaves, stem and root) dry weight compared to plants without NP treatment.
Assuntos
Biomassa , Nanopartículas Metálicas/química , Solanum lycopersicum/crescimento & desenvolvimento , Óxido de Zinco/farmacologia , Fertilizantes , Solanum lycopersicum/química , Folhas de Planta/efeitos dos fármacos , Folhas de Planta/crescimento & desenvolvimento , Raízes de Plantas/efeitos dos fármacos , Raízes de Plantas/crescimento & desenvolvimento , Propriedades de Superfície/efeitos dos fármacos , Óxido de Zinco/químicaRESUMO
Examina-se a relaçäo entre a ingestäo de alimentos e a morbilidade cardiovascular, com particular referência ao consumo de gordura saturada. A aterosclerose e, em particular, a cardiopatia coronária, guarda relaçäo com vários fatores de risco, como a obesidade e a falta de exercício. A importância de todos estes fatores de risco dependem de seus efeitos no aumento dos níveis sanguíneos de colesterol. Entre 1 por cento e dois por cento da populaçäo tem níveis altos de colesterol no sangue por causa de anormalidades genéticas. Mas nos países desenvolvidos, os altos níveis sanguíneos de colesterol devem-se principalmente à uma alimentaçäo inadequada. Os estudos epidemiológicos têm mostrado que a cardiopatia coronária e a trombose säo menos frequentes em populaçöes com regimes alimentícios baixos em colesterol e em gorduras que em outras, cujo consumo destes nutrientes é alto.