Ancient enzymes show life’s nitrogen signal stayed unchanged for billions of years, helping scientists read early Earth.
Oxygen is everywhere on Earth today. But that hasn’t always been the case. Scientists think oxygen only became a lasting part ...
Faculté des Sciences Gabriel, Université de Bourgogne, LIMSAG UMR 5633, 6 Boulevard Gabriel, 21000 Dijon, France, and Department of Chemistry, University of Houston, Houston, Texas 77204-5003 Article ...
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