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Nitrogen-fixing bacteria play a crucial role in fixing atmospheric nitrogen into nitrogen compounds that can be used by plants. The plants absorb the usable nitrogen compounds from the soil through their roots.
- 13 min
Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
- The Editors of Encyclopaedia Britannica
- Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” com...
- Nitrogen is a component of proteins and nucleic acids and is essential to life on Earth. Although nitrogen is abundant in the atmosphere, most orga...
- There are two main types of nitrogen-fixing bacteria. Symbiotic, or mutualistic, species live in root nodules of certain plants. Plants of the pea...
- Examples of symbiotic nitrogen-fixing bacteria include Rhizobium, which is associated with plants in the pea family, and various Azospirillum speci...
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.
Jan 15, 2021 · First, soil bacteria such as Nitrosomonas or Nitrococcus convert ammonia into nitrogen dioxide. Then another type of soil bacterium, called Nitrobacter, adds a third oxygen atom to create nitrate. These bacteria don’t convert ammonia for plants and animals out of the goodness of their hearts.
- Gabe Buckley
Learn how nitrogen is transformed by microorganisms and humans in the ecosystem. Find out how nitrogen fixation, nitrification, denitrification, anammox, and ammonification affect productivity and carbon storage.
Feb 5, 2018 · Atmospheric dinitrogen gas is the largest inventory of freely accessible nitrogen, and it is biologically available to highly diverse but rare nitrogen-fixing bacteria and archaea. Other...
Mar 21, 2024 · Bacteria, such as cyanobacteria, convert nitrogen into nitrogen gas via nitrogen fixation. Nitrogen fixation occurs in three steps: ammonification, nitrification, and denitrification. Human activity can release nitrogen into the environment by the combustion of fossil fuels and by the use of artificial fertilizers in agriculture.
