Brazilian Archives of Biology and Technology, Volume: 42, Issue: 3, Pages: 303-306, Published: 1999 Brazilian Archives of Biology and Technology, Vol 42, Iss 3, Pp 303-306 (1999) Brazilian Archives of Biology and Technology v.42 n.3 1999 Brazilian Archives of Biology and Technology Instituto de Tecnologia do Paraná (Tecpar) instacron:TECPAR