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Microorganisms

Nitrogen fixation not only naturally occurs in soils but also aquatic systems, including both freshwater and marine. Certain cyanobacteria, commonly known as blue-green algae, have the ability to facilitate nitrogen fixation in aquatic systems. Species of nitrogen fixing cyanobacteria in fresh waters include: Aphanizomenon sp. and Dolichospermum sp. (previously Anabaena sp.). Such species have specialized cells called heterocysts, in which N2 fixation occurs via the enzyme nitrogenase.

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