Tracking Down the First Oxygen Users

sciencehabit writes "None of us would be here today if, billions of years ago, a tiny, single-celled organism hadn't started using oxygen to make a living. Researchers don't know exactly when this happened, or why, but a team of scientists has come closer than ever before to finding out. They've identified the earliest known example of aerobic metabolism, the process of using oxygen as fuel. The discovery may even provide clues as to where the oxygen came from in the first place."

Comments

Re:Oxidizer, not fuel

[Samantha Wright]

Oxygen is the most aggressively electronegative element after Fluorine. (I think that Neon might be even more aggressive if you could ionize it usefully.) I had a colourful mnemonic for this in second-year organic chemistry that revolved around bitches and gimps, but the take-home message is that Chlorine robs Nitrogen, and Oxygen wipes out everything but good ol' Fluorine. For related reasons, fluorine becomes a source of face-melting death in hydrogen-bonded form.