The nitrogen cycle is how life borrows an inert atmospheric gas. Microbes fix N2, oxidise ammonia, and return N2 — a relay no animal invented. Haber-Bosch (1909–1913) added an industrial shortcut that now feeds billions and also leaks surplus nitrate and N2O.
People knew legumes enrich soil before they knew bacteria. Chemistry then named the gases; microbiology named the workers. Carl Bosch industrialises the process at Oppau — bread and explosives share a factory.
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The nitrogen cycle is how life borrows an inert atmospheric gas. Microbes fix N2, oxidise ammonia, and return N2 — a relay no animal invented. Haber-Bosch (1909–1913) added an industrial shortcut that now feeds billions and also leaks surplus nitrate and N2O.
People knew legumes enrich soil before they knew bacteria. Chemistry then named the gases; microbiology named the workers. Carl Bosch industrialises the process at Oppau — bread and explosives share a factory.
Anammox (described in the 1990s) combines ammonium and nitrite to N2 — now a wastewater idea, not a home experiment. N2 is everywhere and almost useless until nitrogenase or a factory reduces it. The rest of the cycle is a set of redox jobs.
Rhizobium in clover nodules, Nitrosomonas in soils, and anammox bacteria in wastewater are different actors, not one germ. Only some bacteria and archaea hold the enzyme. Oxygen is a problem for it — hence nodules and thick slime.
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Next question: Norovirus · Open the topic: Nitrogen cycle
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