Iron toxicity for cyanobacteria delayed oxygen accumulation in early Earth’s atmosphere

5 enero 2015

Geomicrobiologists say that the first oxygen-producing bacteria were poisoned by abundant iron in ancient oceans. Three billion years ago, Earth’s atmosphere contained less than 0.0001 percent oxygen. Today’s atmosphere has around 20 percent oxygen — and that is due to the work of tiny microorganisms in Earth’s primeval oceans.