With the increase in industrial and agricultural activities, a large amount of nitrogenous
compounds are released into the environment, leading to nitrate pollution. The perilous …

Nitrification, the aerobic oxidation of ammonia to nitrate via nitrite, has been suggested to
have been a central part of the global biogeochemical nitrogen cycle since the oxygenation …

Ammonia oxidation carried out by ammonia-oxidizing microorganisms (AOMs) is a central
step in the global nitrogen cycle. Aerobic AOMs comprise conventional ammonia-oxidizing …

The discovery of ammonia-oxidizing archaea (AOA), now generally recognized to exert
primary control over ammonia oxidation in terrestrial, marine, and geothermal habitats …

For more than 100 years it was believed that bacteria were the only group responsible for
the oxidation of ammonia. However, recently, a new strain of archaea bearing a putative …

Many wastewater treatment plants in the world do not remove reactive nitrogen from
wastewater prior to release into the environment. Excess reactive nitrogen not only has a …

The two-step nitrification process is an integral part of the global nitrogen cycle, and it is
accomplished by distinctly different nitrifiers. By combining DNA-based stable isotope …

A mesophilic, neutrophilic and aerobic, ammonia-oxidizing archaeon, strain EN76T, was
isolated from garden soil in Vienna (Austria). Cells were irregular cocci with a diameter of …

Studies of the distribution of ammonia oxidising archaea (AOA) and bacteria (AOB) suggest
distinct ecological niches characterised by ammonia concentration and pH, arising through …

Globally distributed archaea comprising ammonia oxidizers of moderate terrestrial and
marine environments are considered the most abundant archaeal organisms on Earth …