AVALIAÇÃO DAS CAUSAS DE RETENÇÃO EM QUÍMICA GERAL NA UNIVERSIDADE FEDERAL DO AMAZONAS

Failing classes is one of the main causes students are held back in universities, which in turn has several academic, social and economic impacts. This study aims to identify factors associated with students flunking General Chemistry, as well as to propose institutional interventions that can remedy these setbacks. The methodology used was based on a conceptual model of nontraditional undergraduate students, evaluating student academic outlook and relating that with institutional data on subject pass rate. Results showed it was possible to correlate variables that influence pass rates in General Chemistry, highlighting the following: busy schedule, study method, high class load per semester, deficiencies in basic chemistry and math, and socioeconomic factors. Results in this work help identify challenges that can aid in developing strategies to eradicate or minimize failing in General Chemistry in higher education institutions in Brazil

Atividades biológicas dos óleos essenciais de Endlicheria citriodora, uma lauraceae rica em geranato de metila

The essential oils of branches and leaves of Endlicheria citiodora were obtained by hydrodistillation and analysed using GC-FID, GC-MS and both NMR 13C and ¹H, resulting in the identification of methyl geranate as major constituent (93%) in both oils. Cytotoxicity, tyrosinase-inhibition and antioxidant activities were studied and characterized. High antioxidant potential (15.52 and 13.53 µg/mL), low cytotoxicity and tyrosinase inhibition (53.85%) were observed. This is the first paper reporting the biological activities and composition of the essential oils of this species