How did anoxic conditions affect nitrogen fixing Cyanobacteria on early Earth?

Arianna Gallo , Katharina Ebel , Thorsten Bauersachs , Achim Herrmann & Michelle M. Gehringer
The Earth’s atmosphere was without free oxygen until the Great Oxygenation Event, thought to have been driven by oxygenic photosynthesis. The expansion of early Cyanobacteria was proposed to be restricted by the lack of bioavailable nitrogen. The effects of an anoxic Archean atmosphere on the growth of a the nitrogen fixing Cyanobacterium Nostoc sp. PCC7524 was compared to control cultures grown under present day atmospheric levels (PAL) of O2 and CO2. Additionally, we assessed how...
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