Brazilian Archives of Biology and Technology v.56 n.5 2013 Brazilian Archives of Biology and Technology Instituto de Tecnologia do Paraná (Tecpar) instacron:TECPAR Brazilian Archives of Biology and Technology, Volume: 56, Issue: 5, Pages: 757-765, Published: OCT 2013 Brazilian Archives of Biology and Technology, Vol 56, Iss 5, Pp 757-765 (2013)