A Ata da defesa, assinada pelos membros da Comissão Examinadora, consta no SIGA/Sistema de Fluxo de Dissertação/Tese e na Secretaria do Programa da Unidade. Este exemplar corresponde à redação final da Dissertação de Mestrado defendida pelo aluno MURILO IZIDORO SANTOS, aprovada pela Comissão Julgadora em 31 de março de 2020.Firstly, I would like to thank my supervisor, Professor Marcelo Ganzarolli, for accepting me as a student, for the supervision and most of all, for igniting my flame of creativity. Professor Maria do Carmo is thanked not only for being my co-supervisor, but also for being my example of professional. I am especially grateful for all the nice and motivating talks we had; whenever I talk to you, I feel relief.Thanks to Laura, for all the assistance with the analyses and the exchange of ideas. I also owe thanks to you for the valuable personal and professional advice. Because of you, I am certain that there is still hope for Brazil, at least for its science.