Petrobras Biocombustível Closes Deal for Nova Fronteira to Merge into São Martinho S.A Dec 19, 2016Petrobras’ wholly owned subsidiary Petrobras Biocombustível S.A. (PBIO) has concluded an agreement under which Nova Fronteira Bioenergia S.A., in which PBIO holds a 49% interrest, will be absorbed by São Martinho.