HOME >> BIOLOGY >> NEWS
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
j.eigenbrode@gl.ciw.edu
202-478-8981
Carnegie Institution
16-Oct-2006


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:
*Name:
*Comment:
*Email:


(Date:4/26/2016)... LONDON , April 26, 2016 ... a product subsidiary of Infosys (NYSE: ... to integrate the Onegini mobile security platform with ... http://photos.prnewswire.com/prnh/20151104/283829LOGO ) The integration will ... to access and transact across channels. Using this ...
(Date:4/14/2016)... AVIV, Israel , April 14, 2016 ... Behavioral Authentication and Malware Detection, today announced the appointment ... already assumed the new role. Goldwerger,s leadership ... BioCatch, on the heels of the deployment of its ... addition, BioCatch,s behavioral biometric technology, which discerns unique cognitive ...
(Date:3/23/2016)... WAKEFIELD, Massachusetts , March 23, 2016 ... kombiniert im Interesse erhöhter Sicherheit Gesichts- und ... Xura, Inc. (NASDAQ: MESG ... heute bekannt, dass das Unternehmen mit SpeechPro ... insbesondere aus der Finanzdienstleistungsbranche, wird die Möglichkeit ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... NC (PRWEB) , ... June 24, 2016 , ... Researchers ... the most commonly-identified miRNAs in people with peritoneal or pleural mesothelioma. Their findings are ... to read it now. , Diagnostic biomarkers are signposts in the blood, lung ...
(Date:6/23/2016)... , June 23, 2016 /PRNewswire/ - FACIT ... Ontario biotechnology company, Propellon Therapeutics ... development and commercialization of a portfolio of first-in-class ... Epigenetic targets such as WDR5 represent an exciting ... significantly in precision medicine for cancer patients. Substantial ...
(Date:6/23/2016)... 2016  The Prostate Cancer Foundation (PCF) is pleased to announce ... cures for prostate cancer. Members of the Class of 2016 were selected from ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... STACS DNA ... Technical Leader at the Arkansas State Crime Laboratory, has joined STACS DNA as a ... STACS DNA team,” said Jocelyn Tremblay, President and COO of STACS DNA. “In further ...
Breaking Biology Technology:
Cached News: