Abstract
Cyanobacteria produce several secondary metabolites, such as toxins and other natural products with antiviral, antifungal, algaecide, antioxidant, and antitumor properties. Previous studies have shown that extracts from Brazilian cyanobacteria that did not contain known toxins displayed biological activity in the brine shrimp assay. They included extracts from strains Calothrix sp. CCIBt3…