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:
TAG: Learning live with oxygen early Earth

(Date:7/2/2015)... 2015 Fingerprint Cards has received an ... FPC1155 from the distributor World Peace Industrial Group (WPI), part ... Asia . Deliveries are planned to take ... used by smartphone manufacturers in Asia . ... communicated revenue guidance of approximately 2,200 MSEK for 2015. ...
(Date:6/25/2015)... 2015 According to a ... & Area), Technology, Material (Optical Prism, Piezoelectric, Capacitive ... & Others) & Geography - Global Forecast to ... market is expected to reach $14,500.07 Million by ... Browse 76 market Tables and 109 Figures ...
(Date:6/24/2015)... , June 24, 2015  Synaptics Inc. ... human interface solutions, today announced that Sharp has ... provide secure authentication for its latest flagship smartphone ... more than 200 million shipments of its fingerprint ... reinforces Synaptics, strength, scalability and leadership in the ...
Breaking Biology News(10 mins):FPC Receives Order for Touch Fingerprint Sensors of 268 MSEK 2Fingerprint Sensors Market Worth $14,500.07 Million by 2020 2Fingerprint Sensors Market Worth $14,500.07 Million by 2020 3Fingerprint Sensors Market Worth $14,500.07 Million by 2020 4Synaptics Brings Natural ID Technology to Sharp's Newest Flagship Smartphone 2
(Date:7/6/2015)... , July 6, 2015 ImmunoCellular Therapeutics, Ltd. ... an agreement with Novella Clinical (Novella), to ... patients with newly diagnosed glioblastoma. Novella is a full-service, ... to small to mid-sized oncology companies. The ICT-107 phase ... the US, Europe and ...
(Date:7/3/2015)... , July 3, 2015 ... voivat hakea verkossa osoitteessa  http://www.openinnovationinscience.at ... Open Innovation in Science" -jatkokoulutusohjelmaan ... Boltzmann Gesellschaftin (LBG) tekemän, kansainvälisiä ... mukaan terveystieteiden kaksi suurinta haastetta ...
(Date:7/3/2015)... , July 3, 2015 ... till 22 september 2015 på  http://www.openinnovationinscience.at ... Innovation in Science" som hålls i ... en färsk undersökning med internationella forskare och ... (LBG) är hälsovetenskapens två största utmaningar bristen ...
(Date:7/3/2015)... WIEN , July 3, 2015 /PRNewswire/ ... indtil den 22. september 2015 på  http://www.openinnovationinscience.at ... in Science", der finder sted i ... en nylig undersøgelse af internationale forskere og ... er de to største udfordringer for sundhedsvidenskaben ...
Breaking Biology Technology:ImmunoCellular Therapeutics Establishes Agreement with Novella Clinical to Conduct ICT-107 Phase 3 Registration Trial in Glioblastoma 2Maailman ensimmäinen tiedemiesten koulutukseen suunniteltu avoimen innovaation ohjelma käynnistyy 2Maailman ensimmäinen tiedemiesten koulutukseen suunniteltu avoimen innovaation ohjelma käynnistyy 3Lansering av världens första program för öppen innovation för att utbilda forskare 2Lansering av världens första program för öppen innovation för att utbilda forskare 3Lancering af verdens første åbne innovationsprogram til uddannelse af forskere 2Lancering af verdens første åbne innovationsprogram til uddannelse af forskere 3
Cached News: