Brain-Score 88/100 SCIENCE Journey to the Microcosmos · 1:01

Nitrogen Fixing Microbes Have To Hide From Oxygen

Nitrogen Fixing Microbes Have To Hide From Oxygen
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3-Second Blueprint (English)

  1. Nitrogen-fixing microbes use the enzyme nitrogenase to cleave strong N2 bonds into accessible ammonia.
  2. Oxygen completely inactivates nitrogenase, forcing many nitrogen-fixing species into anaerobic habitats.
  3. Cyanobacteria like Dolichospermum isolate nitrogenase inside thick-walled cells called heterocysts to block oxygen.
NitrogenaseNitrogen FixationHeterocystsAnaerobic EnvironmentsCyanobacteria

3-Sekunden-Fazit (Deutsch)

  1. Stickstofffixierende Mikroben nutzen das Enzym Nitrogenase, um starke N2-Bindungen zu Ammoniak zu spalten.
  2. Sauerstoff inaktiviert Nitrogenase vollständig, weshalb viele dieser Arten in anaeroben Lebensräumen leben.
  3. Cyanobakterien wie Dolichospermum schützen Nitrogenase in dickwandigen Spezialzellen namens Heterocysten.
NitrogenaseStickstofffixierungHeterocystenAnaerobe LebensräumeCyanobakterien

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