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Access through your institution Buy or subscribe AN ASTROBIOLOGIST CONSIDERS LIFE'S OLDEST OXYGEN. The presence of atmospheric oxygen would have been necessary for the evolution of

eukaryotes — organisms that group their genetic material into a membrane-bounded nucleus — so the question of when oxygen first became available is important in dating their rise. The

availability of such oxygen is linked to the evolution of cyanobacteria, oxygen-producing microbes that appeared early in Earth's history and exist to this day. This is a preview of

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ADDITIONAL ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Old Dominion

University, Norfolk, Virginia Nora Noffke Authors * Nora Noffke View author publications You can also search for this author inPubMed Google Scholar ADDITIONAL INFORMATION Discuss this paper

at HTTP://BLOGS.NATURE.COM/NATURE/JOURNALCLUB RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Noffke, N. Journal club. _Nature_ 457, 939 (2009).

https://doi.org/10.1038/457939e Download citation * Published: 18 February 2009 * Issue Date: 19 February 2009 * DOI: https://doi.org/10.1038/457939e SHARE THIS ARTICLE Anyone you share the

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