(+)-Dehydrofukinone (DHF) is a major component of the essential oil of Nectandra grandiflora (Lauraceae), and exerts a depressant effect on the central nervous system of fish. However, the neuronal mechanism underlying DHF action remains unknown. This study aimed to investigate the action of DHF on GABAA receptors using a silver catfish (Rhamdia quelen) model. Additionally, we investigated the effect of DHF exposure on stress-induced cortisol modulation. Chemical identification was performed using gas chromatography-mass spectrometry and purity was evaluated using gas chromatography with a flame ionization detector. To an aquarium, we applied between 2.5 and 50 mg/L DHF diluted in ethanol, in combination with 42.7 mg/L diazepam. DHF within the range of 10-20 mg/L acted collaboratively in combination with diazepam, but the sedative action of DHF was reversed by 3 mg/L flumazenil. Additionally, fish exposed for 24 h to 2.5-20 mg/L DHF showed no side effects and there was sustained sedation during the first 12 h of drug exposure with 10-20 mg/L DHF. DHF pretreatment did not increase plasma cortisol levels in fish subjected to a stress protocol. Moreover, the stress-induced cortisol peak was absent following pretreatment with 20 mg/L DHF. DHF proved to be a relatively safe sedative or anesthetic, which interacts with GABAergic and cortisol pathways in fish.
O objetivo deste trabalho foi avaliar a percepção de estudantes sobre o programa Ciência sem Fronteiras (CsF) no curso de Odontologia da Universidade Federal de Santa Maria. Foi realizada pesquisa de caráter qualitativo, utilizando entrevista semiestruturada com acadêmicos que participaram do programa CsF. A entrevista foi gravada em áudio, transcrita e, após, procedeu-se a análise dos dados. A partir das entrevistas foram elaboradas seis categorias para análise: Língua estrangeira: fator motivacional e fator de dificuldade; Amadurecimento pessoal: uma expectativa concretizada; Falta de planejamento na criação do programa; Diferenças de metodologia do ensino superior; Impacto do Ciência sem Fronteiras na formação profissional e Contribuições do Ciência sem Fronteiras para a instituição e para o país. Conclui-se que os acadêmicos de Odontologia que participaram do programa perceberam mais impactos positivos na sua vida pessoal, ficando a formação profissional em segundo plano.
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