Navigation Links
Earth's Oxygen May Have Arrived Earlier
Date:9/27/2007

Scientists push back emergence of life-giving element by 100 million years

THURSDAY, Sept. 27 (HealthDay News) -- Traces of oxygen may have been present in Earth's atmosphere 50 million to 100 million years earlier than previously thought, according to two international research teams reporting in the Sept. 28 issue of the journal Science.

Most geoscientists believe that atmospheric oxygen levels increased sharply from very low levels during the Great Oxidation Event, which occurred between 2.3 billion and 2.4 billion years ago. There has been great debate about the amount of oxygen existing before that event, according to background information in a news release about the new research.

The new studies provide "compelling new evidence" of early oxygen and lead to the question of whether it's possible to find evidence that oxygen was produced even earlier, said biogeochemist Ariel Anbar, an associate professor in Arizona State University's School of Earth and Space Exploration and department of chemistry and biochemistry in the College of Liberal Arts and Sciences.

Anbar led one of the research teams and was a member of the other team.

By analyzing layers of a kilometer-long core sample of sedimentary rock taken from the Hamersley Basin in Western Australia, the researchers found evidence that oxygen was present in Earth's oceans and possibly in the atmosphere 2.5 billion years ago.

"We seem to have captured a piece of time before the Great Oxidation Event during which the amount of oxygen was actually changing -- caught in the act, as it were," Anbar said in a prepared statement.

"Studying the dynamics that gave rise to the presence of oxygen in Earth's atmosphere deepens our appreciation of the complex interaction between biology and geochemistry," Carl Pilcher, director of the NASA Astrobiology Institute, said in a prepared statement. The institute helped fund the research.

The findings "support the idea that our planet and the life on it evolved together," Pilcher said.

More information

The American Museum of Natural History has more about oxygen.



-- Robert Preidt



SOURCE: Arizona State University, news release, Sept. 27, 2007


'/>"/>
Copyright©2007 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Research unearths how caffeine prevents us from sleeping
2. Moon, the Best Place to Assess the Earths Climate Changes
3. Oxygen Usage During Exercise Could Indicate Heart Problems
4. The advantages of oxygen therapy
5. Oxygen Treatment may be injurious
6. Oxygen helps heal wounds
7. Oxygen Consumption During Workouts Could Indicate Heart Problems
8. Cooling Can Reduce The Risk Of Brain Damage In Oxygen Deprived Newborns
9. Air travel reduces oxygen level in the blood
10. Influence Of Heart Rate On Myocardial Oxygen Tension
11. Mobilizing Stem Cells at the Injured Site Using Hyperbaric Oxygen Treatments.
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... 2016 , ... The temporary closing of Bruton Memorial Library on June 21 due to a ... new, often overlooked aspect of head lice: the parasite’s ability to live away from a ... occurrence, but a necessary one in the event that lice have simply gotten out of ...
(Date:6/25/2016)... ... June 25, 2016 , ... On Friday, June 10, Van ... Wellness at Work award to iHire in recognition of their exemplary accomplishments in worksite ... 7th annual Maryland Workplace Health & Wellness Symposium at the BWI Marriott in Linthicum ...
(Date:6/24/2016)... ... ... was in a crisis. Her son James, eight, was out of control. Prone to extreme ... “When something upset him, he couldn’t control his emotions,” remembers Marcy. “If there was ... other children and say he was going to kill them. If we were driving ...
(Date:6/24/2016)... Rhinebeck, NY (PRWEB) , ... June 24, 2016 , ... Topical BioMedics, Inc, makers of ... of companies that call for a minimum wage raise to $12 an hour by 2020 ... wage. This will restore the lost value of the minimum wage, assure the wage floor ...
(Date:6/24/2016)... , ... June 24, 2016 , ... ... actively feeding the Frederick area economy by obtaining investment capital for emerging technology ... past 2½ years that have already resulted in more than a million dollars ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... , June 24, 2016   Pulmatrix, Inc ., ... developing innovative inhaled drugs, announced today that it was ... Investments reconstituted its comprehensive set of U.S. and ... "This is an important milestone for Pulmatrix," said Chief ... shareholder awareness of our progress in developing drugs for ...
(Date:6/23/2016)... 23, 2016 Research and Markets has ... - Forecast to 2022" report to their offering. ... for the patients with kidney failure, it replaces the function ... the patient,s blood and thus the treatment helps to keep ... in balance. Increasing number of ESRD patients ...
(Date:6/23/2016)... June 23, 2016 Roche (SIX: RO, ROG; ... for its Elecsys BRAHMS PCT (procalcitonin) assay as a ... septic shock. With this clearance, Roche is the first ... integrated solution for sepsis risk assessment and management. ... infection and PCT levels in blood can aid clinicians ...
Breaking Medicine Technology: