IMIS

Publicaties | Instituten | Personen | Datasets | Projecten | Kaarten
[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina

Nitrogen Fixation in Cyanobacteria
Stal, L.J. (2015). Nitrogen Fixation in Cyanobacteria. Encycl. Life Sci. (Online) December: 1-9. dx.doi.org/10.1002/9780470015902.a0021159.pub2
In: Encyclopedia of Life Sciences (ELS). John Wiley & Sons: Basingstoke. ISSN 1476-9506; e-ISSN 1476-9506, meer

Beschikbaar in  Auteur 

Trefwoord
Author keywords
    circadian rhythm; cyanobacteria; heterocyst; nitrogenase; nitrogen fixation

Auteur  Top 

Abstract
    Cyanobacteria are oxygenic photosynthetic bacteria that are widespread in marine, freshwater and terrestrial environments, and many of them are capable of fixing atmospheric nitrogen. However, ironically, nitrogenase, the enzyme that is responsible for the reduction of N2, is extremely sensitive to O2. Therefore, oxygenic photosynthesis and N2 fixation are not compatible. Hence, cyanobacteria had to evolve a variety of strategies circumventing this paradox, allowing them to grow at the expense of N2, a ubiquitous source of nitrogen. Some filamentous cyanobacteria differentiate heterocysts. These cells lack the oxygenic photosystem and possess a glycolipid cell wall that keeps the oxygen concentration sufficiently low for nitrogen fixation to take place. This strategy is known as spatial separation of oxygenic photosynthesis and nitrogen fixation. Nonheterocystous cyanobacteria may temporally separate these processes by fixing nitrogen during the night. Again others use a combination of these strategies.

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteur