Abstract
This research project aims at accessing the molecular and genetic characteristics of cyanobacterial strains isolated from caatinga, through the analysis of morphometric characters, sequencing of the nifH gene from the nitrogenase complex - responsible by N2 fixation - and the 16S rRNA gene, used for cyanobacterial discrimination. The toxins (microcystin, cylindrospermopsin and saxitoxin) …