Brazilian Archives of Biology and Technology, Vol 53, Iss 1, Pp 141-152 (2010) Brazilian Archives of Biology and Technology, Volume: 53, Issue: 1, Pages: 141-152, Published: FEB 2010 SciELO Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Brazilian Archives of Biology and Technology v.53 n.1 2010 Brazilian Archives of Biology and Technology Instituto de Tecnologia do Paraná (Tecpar) instacron:TECPAR