Navigation Links
Oxygen increase caused mammals to triumph, researchers say

The first, high resolution continuous record of oxygen concentration in the earth's atmosphere shows that a sharp rise in oxygen about 50 million years ago gave mammals the evolutionary boost they needed to dominate the planet, according to Paul Falkowski, Rutgers professor of marine science and lead author of a paper published Sept. 30 in the journal Science.

Falkowski and his colleagues have measured the abundance of carbon 13, a byproduct of photosynthesis, in deep-sea core samples that go back 205 million years. Because photosynthesis produces oxygen and leaves carbon 13 behind, the presence of carbon 13 in the fossil samples allows scientists to estimate precisely how much oxygen was in the atmosphere at any given time, Falkowski says.

From a steady 10 percent ?the level at which dinosaurs flourished ?the oxygen percentage rose to 17 percent 50 million years ago and then to 23 percent by 40 million years ago.

"In the fossil record, we see that see that this rise in oxygen content corresponds exactly to a really rapid rise of large, placental mammals," Falkowski says. "The more oxygen, the bigger the mammals. We argue that the rise in oxygen content allowed mammals to become very, very large - mammals like 12-foot-tall sloths and huge saber-toothed cats. They paved the way for all subsequent large mammals, including ourselves."

The results described in Falkowski's article, "The Rise of Oxygen Over the Past 205 Million Years and the Evolution of Large Placental Mammals," stem from years of analysis of organic and inorganic core samples. Scientists have been using deep-sea core samples for years, but Falkowski and his colleagues have achieved greater precision in their measurements, thanks to two high-precision, isotope ratio mass spectrometers housed in the geological sciences department at Rutgers.

There were placental mammals on Earth at the time of the great extinction of dinosaurs about 65 million years ago, Falko
'"/>

Source:Rutgers, the State University of New Jersey


Page: 1 2

Related biology news :

1. Plant hemoglobins: Oxygen handlers critical for nitrogen fixation
2. Yeast Network Prevents Damage By Oxygen Radicals
3. Boosting HIV screening can increase survival and is cost effective
4. Sexual cooperation: Mating increases longevity in ant queens
5. Mother birds increase progesterone to hatch females
6. Ibruprofen and other commonly used painkillers for treating inflammation may increase the risk of heart attack
7. Global warming increases oyster sensitivity to pollution
8. Prescription pain patch abuse blamed for increase in deaths
9. Prenatal exposure to famine increases risk of schizophrenia
10. Agricultural workers at increased risk for infection with animal flu viruses
11. Gene increases risk of tuberculosis
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Oxygen increase caused mammals triumph researchers say

(Date:5/8/2015)... -- Synaptics Inc. (NASDAQ: SYNA ), the leading developer ... executive management team will present at the following investor events: ... Conference Date: May 18, 2015 Time: 10:40am ET ... Cowen and Company Technology, Media & Telecom ... New York Palace Hotel, New York, NY ...
(Date:4/27/2015)... -- NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... growing mobile commerce market, announces that its Wocket® Smart ... week of May, 2015 and will be fulfilling all ... Gino Pereira , Chief Executive Officer said, ... Wocket® enters the consumer market. We would like to ...
(Date:4/17/2015)... 17, 2015 Increasing ... technological advancement to drive biometric systems market in ...   According to a recently released ... &  Opportunities, 2020 ", biometric systems market in ... growth at CAGR of over 22% through 2020. ...
Breaking Biology News(10 mins):Synaptics to Present at Upcoming Investor Conferences 2Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 2Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 3Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 2Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 3
... a new understanding of how male puberty begins. ... known as SMAD3 and the rate at which it is ... the Faculty of Medicine, Nursing and Health Sciences have discovered ... in faster maturation than the norm, and an inability to ...
... genius is a byproduct of good genes or good environment ... an entirely new direction. University of Alberta researcher Marty Mrazik ... of a natural hormone. Mrazik, a professor in the ... Rider University in the U.S., have published a paper in ...
... a team of Spanish and Greek researchers, and published in the ... than 30% of the hake products sold in Spain and Greece ... Africa are being labelled as American or European, meaning consumers pay ... the University of Oviedo (Spain) and co-author of the study, tells ...
Cached Biology News:Monash scientists uncover a new understanding of male puberty 2U of A researcher questions whether genius might be a result of hormonal influences 2Around 40 percent of hake is mislabeled 2
(Date:5/26/2015)... Calif. , May 26, 2015  Asterias Biotherapeutics, ... the emerging field of regenerative medicine, today announced that ... June 2014 were exercised prior to their expiry on ... Company of $11.7 million. "We thank our ... , President and CEO of Asterias. "This exercise of ...
(Date:5/26/2015)... , May 26, 2015  AbbVie (NYSE: ... that it has completed the acquisition of Pharmacyclics, ... oncology. Pharmacyclics is a leader in the hematological ... used to treat hematological cancers, a $24 billion ... combined with AbbVie,s broad late-stage oncology pipeline, has ...
(Date:5/26/2015)... Just the characterization of being a ... need does not guarantee immediate acceptance. In particular, ... many prior failures is often met with significant skepticism. ... an irony that is often an unappreciated aspect of ... Asymmetrex has found that building acceptance of ...
(Date:5/25/2015)... TX (PRWEB) May 25, 2015 ... Hydrogen Chloride Industry is a professional and in-depth ... Hydrogen Chloride Market with a focus ... the hydrogen chloride market research are Linde Industrial ... Chemcial, Yuanhua Chemical, Shandong Xinlong Group, Longsheng Group, ...
Breaking Biology Technology:Asterias Biotherapeutics Receives $11.7 Million in Proceeds from Exercise of Warrants 2Asterias Biotherapeutics Receives $11.7 Million in Proceeds from Exercise of Warrants 3AbbVie Completes Acquisition of Pharmacyclics 2AbbVie Completes Acquisition of Pharmacyclics 3AbbVie Completes Acquisition of Pharmacyclics 4AbbVie Completes Acquisition of Pharmacyclics 5AbbVie Completes Acquisition of Pharmacyclics 6In August Asymmetrex Will Present Details of Its Crowdsourcing Campaign to Determine the Extent of Application of New Technologies for Counting Adult Tissue Stem Cells 2In August Asymmetrex Will Present Details of Its Crowdsourcing Campaign to Determine the Extent of Application of New Technologies for Counting Adult Tissue Stem Cells 3Global Hydrogen Chloride Industry 2015 Trends and Analysis Available in a New Report at DeepResearchReports.com 2Global Hydrogen Chloride Industry 2015 Trends and Analysis Available in a New Report at DeepResearchReports.com 3
... BETHESDA, Md., Sept. 16 American Capital Ltd. ... 15, it completed the sale of its portfolio company Axygen ... Inc., to Corning Incorporated for approximately $400 million. The ... fee income, from the equity invested by American Capital,s affiliated ...
... , , COLUMBIA, Md., Sept. 16 Martek ... David M. Pernock to its Board of Directors. , ... extensive background in the commercialization of pharmaceutical products, having served from ... (GSK), one of the world,s leading healthcare companies. In his most ...
... HEIDELBERG, Germany, September 16 , ... Drug Targets in Wnt Pathway , ... antagonizes Wnt signalling"** is now available online in,Nature. , ... proteomics,platform was used to identify a small molecule which plays ...
Cached Biology Technology:American Capital Receives $182 Million In Proceeds From Sale of Axygen Bioscience 2American Capital Receives $182 Million In Proceeds From Sale of Axygen Bioscience 3American Capital Receives $182 Million In Proceeds From Sale of Axygen Bioscience 4Martek Announces Addition to Its Board of Directors 2Cellzome Technology Used to Unravel Novel Regulatory Mechanism in Cancer Signaling Pathway 2
50 assays. Provides an easy system for rapid separation of cytosol and particulate fractions that are compatiable with downstream studies....
Eliminate electrical interference from any analog signal, without filtering. Ideal for electrophysiology applications like EKG, EMG, and EEGs. Removes 50/60hz noise and harmonics caused by grounding ...
... 400 Spun Columns, 10. *SizeSep 400 Spun ... 400 base pairs in length. - ... and pre-equilibrated in distilled water containing 0.15% Kathon ... ~ 400 base pairs. *Extremely useful ...
... CyScribe GFX Purification Kit, 25 ... CyDye labeled cDNA probesProvides efficient removal ... from labeling reactions with superior yields ... for the purification of cDNA labeled ...
Biology Products: