An ammonia-oxidizing, carbon-fixing archaeon, Candidatus “Nitrosopumilus maritimus,”
recently was isolated from a salt-water aquarium, definitively confirming that chemoautotrophy …

The widespread occurrence and diversity of ammonia oxidizing Archaea suggests their
contribution to the nitrogen cycle is of global significance. Their distribution appeared limited to …

In a study of the transport and transformation of particulate amino acids in the Southern
Ocean, we found that silicate and calcium carbonate biominerals play an important role in the …

Ammonia-oxidizing archaea (AOA) are now implicated in exerting significant control over the
form and availability of reactive nitrogen species in marine environments. Detailed studies …

Organisms within all domains of life require the cofactor cobalamin (vitamin B 12 ), which is
produced only by a subset of bacteria and archaea. On the basis of genomic analyses, …

This study demonstrates that intracrystalline organic matter in coral skeletons is well preserved
over century timescales. The extent of preservation of organic matter in coral skeletons …

Muddy carbonate deposits near the Dry Tortugas, Florida, are characterized by high organic
carbon remineralization rates. However, approximately half of the total sedimentary organic …

Archaea are abundant in marine and terrestrial aquatic environments, sediments, and soils.
They inhabit at least an 85C temperature range from the polar ocean to hydrothermal springs…

Nitrification is a critical process for the balance of reduced and oxidized nitrogen pools in
nature, linking mineralization to the nitrogen loss processes of denitrification and anammox. …

In the surface ocean, phytoplankton transform inorganic substrates into organic matter that
fuels the activity of heterotrophic microorganisms, creating intricate metabolic networks that …