Learning to live with oxygen on early Earth

Washington, D.C. Scientists at the Carnegie Institution and Penn State University* have discovered evidence showing that microbes adapted to living with oxygen 2.72 billion years ago, at least 300 million years before the rise of oxygen in the atmosphere. The finding is the first concrete validation of a long-held hypothesis that oxygen was being produced and consumed by that time and that the transition to an oxygenated atmosphere was long term. The results are published in the on-line early edition of the Proceedings of the National Academy of Science, to appear the week of October 16th.

It is generally believed that before 2.4 billion years ago, Earth's atmosphere was essentially devoid of oxygen. Exactly when and how oxygen-producing photosynthesis evolved and began fueling the atmosphere with the gas that much of life depends on has been hotly debated for some time. Plants, algae, and cyanobacteria (blue-green algae) emit oxygen as a waste product of photosynthesis--the process by which sugar, essential for nutrition, is made from light, water, and carbon dioxide.

"Our evidence points to the likelihood that Earth was peppered with small 'oases' of shallow-water, oxygen-producing, photosynthetic microbes around 2.7 billion years ago," stated lead author Jennifer Eigenbrode of Carnegie's Geophysical Laboratory, who collected the data while pursuing her Ph.D. at Penn State. "Over time these oases must have expanded, eventually enriching the atmosphere with oxygen. Our data record this transition."

The researchers discovered changes in fossil isotopes of the life-essential element carbon in a 150 million-year section of rock that included shallow and deepwater sediments from the late Archean period (the Archean lasted from 3.8 to 2.5 billion years ago) in Hamersley Province in Western Australia. Isotopes are different forms of an element's atoms. The relative proportions of carbon and other isotopes in organic matter depend on c

Contact: Jennifer Eigenbrode
Carnegie Institution

Page: 1 2

Related biology news :

1. Learning to evolve: With a little help from my ancestors
2. Learning a second language -- Is it all in your head?
3. Protein pulling -- Learning how proteins fold by pulling them apart
4. Learning how to help migrating swans find forage
5. Learning during sleep?
6. Learning how nature splits water
7. Learning global solutions to local problems
8. Learning the lessons of the worlds oldest ecological experiment
9. Learning the language of DNA
10. SNM Lifelong Learning and Self-Assessment program modules approved by ABNM, ABR for CME credit
11. Learning to love bacteria: Stanford scientist highlights bugs benefits

Post Your Comments:

(Date:4/3/2017)... WASHINGTON , April 3, 2017 /PRNewswire-USNewswire/ ... single-cell precision engineering platform, detected a statistically ... cell product prior to treatment and objective ... highlight the potential to predict whether cancer ... prior to treatment, as well as to ...
(Date:3/29/2017)... , March 29, 2017  higi, the health IT ... North America , today announced a ... the acquisition of EveryMove. The new investment and acquisition ... of tools to transform population health activities through the ... data. higi collects and secures data today ...
(Date:3/24/2017)... 2017 Research and Markets has announced the ... & Trends - Industry Forecast to 2025" report to their ... The Global ... CAGR of around 15.1% over the next decade to reach approximately ... the market estimates and forecasts for all the given segments on ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... BioMedGPS announces expanded coverage ... its newest module, US Hemostats & Sealants. , SmartTRAK’s US Market for Hemostats ... sealants, synthetic sealants and biologic sealants used in surgical applications. BioMedGPS estimates the ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... President Andi Purple announced Dr. Suneel I. Sheikh, the co-founder, CEO and chief ... ), Inc. has been selected for membership in ARCS Alumni Hall of ...
(Date:10/11/2017)... Palo Alto, CA, USA (PRWEB) , ... October 11, 2017 , ... ... is set to take place on 7th and 8th June 2018 in San Francisco, ... and policy influencers as well as several distinguished CEOs, board directors and government officials ...
(Date:10/11/2017)... LAGUNA HILLS, Calif. , Oct. 11, 2017 ... London (ICR) and University of ... prognostic tool to risk-stratify patients with multiple myeloma (MM), in ... nine . The University of Leeds ... by Myeloma UK, and ICR will perform the testing services ...
Breaking Biology Technology:
Cached News: