Many multicellular cyanobacteria produce specialized nitrogen-fixing heterocysts. During
diazotrophic growth of the model organism Anabaena (Nostoc) sp. strain PCC 7120, a …

Nitrogen is a quantitatively important bioelement which is incorporated into the biosphere
through assimilatory processes carried out by microorganisms and plants. Numerous …

Nitrogen metabolism in prokaryotes involves the coordinated expression of a large number
of enzymes concerned with both utilization of extracellular nitrogen sources and intracellular …

Within the wide biodiversity that is found in the bacterial world, Cyanobacteria represents a
unique phylogenetic group that is responsible for a key metabolic process in the biosphere …

Many, though not all, non-heterocystous cyanobacteria can fix N2. However, very few strains
can fix N2 aerobically. Nevertheless, these organisms may make a substantial contribution …

Cyanobacteria may possess several enzymes that are directly involved in dihydrogen
metabolism: nitrogenase (s) catalyzing the production of hydrogen concomitantly with the …

Certain filamentous nitrogen-fixing cyanobacteria generate signals that direct their own
multicellular development. They also respond to signals from plants that initiate or modulate …

One of the most remarkable features of the evolutionary process is its capacity to construct.
In billions of years a primordial soup of organic compounds evolved to the theater of life …

The fixation of atmospheric N2 by cyanobacteria is a major source of nitrogen in the
biosphere. In Nostocales, such as Anabaena, this process is spatially separated from …

Nitrogen sources commonly used by cyanobacteria include ammonium, nitrate, nitrite, urea
and atmospheric N2, and some cyanobacteria can also assimilate arginine or glutamine …