The authors are grateful to the São Paulo Research Foundation
(FAPESP) for funding project nos. 2010/05241-8 and 2010/05240-1,
and for the fellowship awarded to MTK Kubo (2011/09220-8). The
authors are also grateful to Prof. Dr. Carlos R. F. Grosso, Tech. Yara
Fagnani Honório, Profa. Dra. Adriana Z. Mercadante and Dr. Renato
Grimaldi (University of Campinas) for the support given with the
PSD, color, optical and electronic microscopy analyses