Bradyrhizobia are abundant soil bacteria, which can formnitrogen-fixing symbioses with leguminous plants, including important crops such as soybean, cowpea and peanut. Many bradyrhizobia can denitrify, but studies have ...

The strong greenhouse gas nitrous oxide (N2O) can be emitted from wastewater treatment systems as a byproduct of ammonium oxidation and as the last intermediate in the stepwise reduction of nitrate to N2 by denitrifying ...

Accumulating empirical evidence over the last 60 years has shown that the reduction of N2O toN2 is impaired by low soil pH, suggesting that liming of acid soils may reduce N2O emissions. This option has not gained much ...

Ammonia oxidising bacteria (AOB) are thought to emit more nitrous oxide (N2O) than ammonia oxidising archaea (AOA), due to their higher N2O yield under oxic conditions and denitrification in response to oxygen (O2) limitation. ...

Anoxic spells in soil induce denitrification, i.e. the sequential reduction NO3-→NO2-→NO→N2O→N2, catalysed by the four enzymes NAR, NIR, NOR and NOS, respectively. Transient accumulation of all intermediates is inevitable, ...

Environmental bacteria are in general limited by nutrient availability, and as the conditions fluctuate rapidly and unpredictably they must adapt or they will not thrive. This requires fast and adequate sensing and ...

Denitrification allows sustained respiratory metabolism during periods of anoxia, an advantage in soils with frequent anoxic spells. However, the gains may be more than evened out by the energy cost of producing the ...