Study of the presence of the microsytin toxin in water and impacts in the public health - Sanches, Sérgio Marcos; Andrade, Fabiane M. de; Segura-Muñoz, Susana Inés; Prado, Eliana L. do; Vieira, Eny Maria; Takayanagui, Angela Maria Magosso (International Symposium on Residue Management in Universities, 2006)