“…EMS is a highly efficient mutagenic agent directly acting on the DNA molecule through its alkylating activity. These sort of changes are the most common criteria used as an indication of malignancy, differentiating normal cells from the malignant ones with the malignant cells nuclei presenting a variable nucleoli number of different sizes and shapes (Oshima and Forones, 2001;Filippin et al, 2006;Montanaro et al, 2008). Locale C, the Ribeirão das Lages River following the influx of the Paraíba do Sul River showed no significant changes (Table 1).…”