Chemical Composition of the Essential Oils in Portuguese Daucus Carota Subspecies

This study focused on five different subspecies of Portuguese Daucus carota L., to identify the main compounds in the essential oils of umbels from each subspecies. The isolation of the essential oils was performed by hydrodistillation methods followed by further composition analysis by gas chromatography-mass spectrometry, ultimately demonstrating that each subspecies had different major compounds. This study concluded that the main compounds found in Daucus carota subsp. maritimus were geranyl acetate, followed by trans-methyl-isoeugenol, α-pinene, cis-asarone and elemicin. Daucus carota subsp. hispidus presented with the major compounds as geranyl acetate, caryophyllene oxide, trans-methyl-isoeugenol and sabinene. For Daucus carota subsp. maximus, the major compounds were cis-asarone, geranyl acetate and elemicin, which was similar to Daucus carota subsp. carota which presented with the major compounds as geranyl acetate, cis-asarone, trans-methylisoeugenol and α-pinene. Finally, the major components of Daucus carota subsp. sativus were carotol and daucol. Keywords: essential oils, chemical composition, Daucus carota, hydrodistillation, GC-M

Uma proposta multidiciplinar para cálculo numérico: otimização de parâmetros de modelos de radiopropagação / A multidiciplinary proposal for numerical calculation: optimization of parameters of radiopropagation models

O presente trabalho aborda aplicações de Mínimos Quadrados Lineares para motivar o aprendizado da disciplina de Cálculo Numérico. Aproximação de curvas de propagação em ambientes indoor e outdoor são algumas das aplicações possíveis desta técnica para as telecomunicações. O foco do trabalho, é a aplicação da técnica em problemas reais, para instigar a curiosidade do aluno e deixa-lo apto para resolver os mais variados problemas de forma rápida e com valores ótimos. Será descrito o uso da técnica e estudos de casos para modelagem de canal de radiopropagação para consolidar o uso da mesma