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What (who) is Koeppe nodules - definition
![Nitrogen is the most commonly limiting nutrient in plants. Legumes use nitrogen fixing bacteria, specifically symbiotic rhizobia bacteria, within their root nodules to counter the limitation. Rhizobia bacteria convert nitrogen gas (N<sub>2</sub>) to [[ammonia]] (NH<sub>3</sub>) in a process called [[nitrogen fixation]]. Ammonia is then assimilated into [[nucleotide]]s, [[amino acid]]s, [[vitamin]]s and [[flavone]]s which are essential to the growth of the plant. The plant root cells convert sugar into organic acids which then supply to the rhizobia in exchange, hence a symbiotic relationship between rhizobia and the legumes.](https://commons.wikimedia.org/wiki/Special:FilePath/Symbiosis in Root Nodules.png?width=200 "Nitrogen is the most commonly limiting nutrient in plants. Legumes use nitrogen fixing bacteria, specifically symbiotic rhizobia bacteria, within their root nodules to counter the limitation. Rhizobia bacteria convert nitrogen gas (N<sub>2</sub>) to [[ammonia]] (NH<sub>3</sub>) in a process called [[nitrogen fixation]]. Ammonia is then assimilated into [[nucleotide]]s, [[amino acid]]s, [[vitamin]]s and [[flavone]]s which are essential to the growth of the plant. The plant root cells convert sugar into organic acids which then supply to the rhizobia in exchange, hence a symbiotic relationship between rhizobia and the legumes.")
![''Vicia Faba'']] roots.](https://commons.wikimedia.org/wiki/Special:FilePath/Tuinboon stikstofknolletjes.jpg?width=200 "''Vicia Faba'']] roots.")
![''[[Soybean]]'' roots.](https://commons.wikimedia.org/wiki/Special:FilePath/Glycine max root nodules.jpg?width=200 "''[[Soybean]]'' roots.")
![''[[Robinia pseudoacacia]]'' nodules](https://commons.wikimedia.org/wiki/Special:FilePath/Robinia pseudoacacia root nodules.JPG?width=200 "''[[Robinia pseudoacacia]]'' nodules")
![Medicago Root]]'' nodule of the [[Fabaceae]] plants family.](https://commons.wikimedia.org/wiki/Special:FilePath/Closeup of a Dissected Medicago Root Nodule 2.JPG?width=200 "Medicago Root]]'' nodule of the [[Fabaceae]] plants family.")
![[[Fabaceae]] family root nodules.](https://commons.wikimedia.org/wiki/Special:FilePath/Fabaceae root nodules with Bradyrhizobium.jpg?width=200 "[[Fabaceae]] family root nodules.")
![''[[Medicago]] italica'' nodules.](https://commons.wikimedia.org/wiki/Special:FilePath/Medicago italica root nodules 1.JPG?width=200 "''[[Medicago]] italica'' nodules.")
![[[Cowpea]] (''[[Vigna unguiculata]] spp.'') roots.](https://commons.wikimedia.org/wiki/Special:FilePath/Rhizobia nodules on Vigna unguiculata.jpg?width=200 "[[Cowpea]] (''[[Vigna unguiculata]] spp.'') roots.")
Wikipedia
Polymetallic nodules, also called manganese nodules, are mineral concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. As nodules can be found in vast quantities, and contain valuable metals, deposits have been identified as a potential economic interest.
Nodules vary in size from tiny particles visible only under a microscope to large pellets more than 20 centimetres (8 in) across. However, most nodules are between 3 and 10 cm (1 and 4 in) in diameter, about the size of hen's eggs or potatoes. Their surface textures vary from smooth to rough. They frequently have botryoidal (mammillated or knobby) texture and vary from spherical in shape to typically oblate, sometimes prolate, or are otherwise irregular. The bottom surface, buried in sediment, is generally rougher than the top due to a different type of growth.
