A cluster of Escherichia coli bacteria magnified 10,000 times
Schematic representation of the nitrogen cycle. Abiotic nitrogen fixation has been omitted.
Ball-and-stick model of the diamminesilver(I) cation, [Ag(NH3)2]+
Antonie van Leeuwenhoek was the first to study microscopic organisms.
Nodules are visible on this broad bean root
Ball-and-stick model of the tetraamminediaquacopper(II) cation, [Cu(NH3)4(H2O)2](2+)
Lazzaro Spallanzani showed that boiling a broth stopped it from decaying.
A sectioned alder tree root nodule
Jabir ibn Hayyan
Vardhmana Mahavira postulated the existence of microscopic creatures in the sixth century BC.
Equipment for a study of nitrogen fixation by alpha rays (Fixed Nitrogen Research Laboratory, 1926)
This high-pressure reactor was built in 1921 by BASF in Ludwigshafen and was re-erected on the premises of the University of Karlsruhe in Germany.
Louis Pasteur showed that Spallanzani's findings held even if air could enter through a filter that kept particles out.
Lightning heats the air around it breaking the bonds of starting the formation of nitrous acid.
A train carrying Anhydrous Ammonia.
Robert Koch showed that microorganisms caused disease.
Liquid ammonia bottle
Staphylococcus aureus bacteria magnified about 10,000x
Household ammonia
Euglena mutabilis, a photosynthetic flagellate
Ammoniacal Gas Engine Streetcar in New Orleans drawn by Alfred Waud in 1871.
A tetrad of Deinococcus radiodurans, a radioresistant extremophile bacterium
The X-15 aircraft used ammonia as one component fuel of its rocket engine
The photosynthetic cyanobacterium Hyella caespitosa (round shapes) with fungal hyphae (translucent threads) in the lichen Pyrenocollema halodytes
Anti-meth sign on tank of anhydrous ammonia, Otley, Iowa. Anhydrous ammonia is a common farm fertilizer that is also a critical ingredient in making methamphetamine. In 2005, Iowa used grant money to give out thousands of locks to prevent criminals from getting into the tanks.
Wastewater treatment plants rely largely on microorganisms to oxidise organic matter.
The world's longest ammonia pipeline (roughly 2400 km long), running from the TogliattiAzot plant in Russia to Odessa in Ukraine
A laboratory fermentation vessel
Hydrochloric acid sample releasing HCl fumes, which are reacting with ammonia fumes to produce a white smoke of ammonium chloride.
The eukaryotic parasite Plasmodium falciparum (spiky blue shapes), a causative agent of malaria, in human blood
Production trend of ammonia between 1947 and 2007
Main symptoms of hyperammonemia (ammonia reaching toxic concentrations).
Ammonia occurs in the atmospheres of the outer giant planets such as Jupiter (0.026% ammonia), Saturn (0.012% ammonia), and in the atmospheres and ices of Uranus and Neptune.

Nitrogen fixation is a chemical process by which molecular nitrogen, with a strong triple covalent bond, in the air is converted into ammonia or related nitrogenous compounds, typically in soil or aquatic systems but also in industry.

- Nitrogen fixation

Nitrogen fixation is carried out naturally in soil by microorganisms termed diazotrophs that include bacteria, such as Azotobacter, and archaea.

- Nitrogen fixation

He was responsible for the first isolation and description of both nitrifying and nitrogen-fixing bacteria.

- Microorganism

These organisms are also common in soil and play a vital role in ammonia oxidation.

- Microorganism

Anhydrous ammonia is currently used commercially to reduce or eliminate microbial contamination of beef.

- Ammonia

Therefore, nitrogen fixation is required for the synthesis of amino acids, which are the building blocks of protein.

- Ammonia
A cluster of Escherichia coli bacteria magnified 10,000 times

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