BACKGROUND Biological dinitrogen (N2) fixation, the reduction of atmospheric N2 to
ammonia, is important for maintaining the fertility of the oceans by providing biologically …

Nitrogen (N) is a key element for life in the oceans. It controls primary productivity in many
parts of the global ocean, consequently playing a crucial role in the uptake of atmospheric …

Marine diazotrophs convert dinitrogen (N 2) gas into bioavailable nitrogen (N), supporting
life in the global ocean. In 2012, the first version of the global oceanic diazotroph database …

Symbiotic interactions were key to the evolution of chloroplast and mitochondria organelles,
which mediate carbon and energy metabolism in eukaryotes. Biological nitrogen fixation, the …

Persistent nitrogen depletion in sunlit open ocean waters provides a favorable ecological
niche for nitrogen-fixing (diazotrophic) cyanobacteria, some of which associate symbiotically …

Nitrogen fixation is critical for the biological productivity of the ocean, but clear mechanistic
controls on this process remain elusive. Here, we investigate the abundance, activity, and …

Diazotrophs are widespread microorganisms that alleviate nitrogen limitation in 60% of our
oceans, thereby regulating marine productivity. Yet, the group-specific contribution of …

Abstract Microbial dinitrogen (N 2) fixation, the nitrogenase enzyme-catalysed reduction of N
2 gas into biologically available ammonia, is the main source of new nitrogen (N) in the …

Biological dinitrogen (N2) fixation is an important source of nitrogen (N) in low-latitude open
oceans. The unusual N2-fixing unicellular cyanobacteria (UCYN-A)/haptophyte symbiosis …

The microbial fixation of N2 is the largest source of biologically available nitrogen (N) to the
oceans. However, it is the most energetically expensive N-acquisition process and is …