title: Expanding ecological possibilities: Biological nitrogen fixation updated.
abstract: Biological Nitrogen Fixation (BNF)1 is classically understood as a process restricted to the rhyzosphere and carried out by only few free-living organisms. Recent reports present a variety of new representatives of diazotrophs as well as the presence of known nitrogen-fixing organisms in new habitats. These data were systematized to expand the view on the diazotrophs' ecology and capabilities, bringing new insights on the biogeochemical cycle of nitrogen and its implications on the ecologic chain. With these new discoveries regarding BNF occurrence, we herein bring a brief review systematizing the available new data aiming to help teachers and students in updating their view on this subject, which has been underestimated in most textbooks.
authors: Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.
authors: Erik
authors: E
authors: Montagna
authors: Bayardo B
authors: BB
authors: Torres