The ocean is home to a diverse and metabolically versatile microbial community that
performs the complex biochemical transformations that drive the nitrogen cycle, including …

Nitrogen is an essential component of all living organisms and the main nutrient limiting life
on our planet. By far, the largest inventory of freely accessible nitrogen is atmospheric …

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

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 …

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

Secondary ion mass spectrometry (SIMS) has become an increasingly utilized tool in
biologically relevant studies. Of these, high lateral resolution methodologies using the …

Phytoplankton form the basis of the marine food web and are responsible for approximately
half of global carbon dioxide (CO2) fixation (∼ 50 Pg of carbon per year). Thus, these …

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 …

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 …

Biological nitrogen fixation contributes significantly to marine primary productivity. The
current view depicts few cyanobacterial diazotrophs as the main marine nitrogen fixers …