and, in special, Leandro Fernandes PhD, who welcome and supported me with samples preparations, doubts and, also, conversations and advice.To department's technicians and administrative personnel, in special, João Bernardi and Pedro di Lorenzo, for help carrying out the tests performed, and Victor Barioto, for helping with bureaucratic issues.For my parents, João Francisco Emilio and Célia C. Verdi Emilio, for love me and help me to achieve my goals; my sisters Heloisa H. Verdi Emilio e Maria Leticia Verdi Emilio, for supporting me in my decisions; and my boyfriend, Pedro Bonella, for advice, patience and love.