Navigation Links
Researchers find origin of 'breathable' atmosphere half a billion years ago
Date:10/29/2007

of plants and animals, but there was life in the ocean, mainly in the form of plankton, sea sponges, and trilobites. Most of the early ancestors of the plants and animals we know today existed during the Cambrian, but life wasn't very diverse.

Then, during the Ordovician period, which began around 490 million years ago, many new species sprang into being. The first coral reefs formed during that time, and the first true fish swam among them. New plants evolved and began colonizing land.

If you picture the evolutionary tree of life,' most of the main branches existed during the Cambrian, but most of the smaller branches didn't get filled in until the Ordovician, Saltzman said. That's when animal life really began to develop at the family and genus level. Researchers call this diversification the Ordovician radiation.

The composition of the atmosphere has changed many times since, but the pace of change during the Cambrian is remarkable. That's why Saltzman and his colleagues refer to this sudden influx of oxygen during the SPICE event as a pulse or burst.

After this pulse of oxygen, the world remained in an essentially stable, warm climate, until late in the Ordovician, Saltzman said.

He stopped short of saying that the oxygen-rich atmosphere caused the Ordovician radiation.

We know that oxygen was released during the SPICE event, and we know that it persisted in the atmosphere for millions of years -- during the time of the Ordovician radiation -- so the timelines appear to match up. But to say that the SPICE event triggered the diversification is tricky, because it's hard to tell exactly when the diversification started, he said.

We would need to work with paleobiologists who understand how increased oxygen levels could have led to a diversification. Linking the two events precisely in time is always going to be difficult, but if we could link them conceptually, then it would become a more convincing s
'/>"/>

Contact: Matthew Saltzman
Saltzman.11@osu.edu
614-292-0481
Ohio State University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Researchers find how protein allows insects to detect and respond to pheromones
3. Researchers Uncover Key Step In Manufacture of Memory Protein
4. NYU researchers simulate molecular biological clock
5. Researchers reveal the infectious impact of salmon farms on wild salmon
6. Researchers identify target for cancer drugs
7. Vital step in cellular migration described by UCSD medical researchers
8. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
9. UCSD researchers maintain stem cells without contaminated animal feeder layers
10. Researchers discover molecule that causes secondary stroke
11. Researchers find missing genes of ancient organism
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/17/2014)... 16, 2014  Automation is fundamentally transforming the ... than at international borders. Over the past decade, ... allowed veteran travelers to self process through border ... Kiosks at an increasing number of airports, seaports, ... According to Maxine Most , Principal ...
(Date:12/11/2014)... 10, 2014  Data Sciences International (DSI), the ... a new series of digital telemetry implants to ... M series, part of the PhysioTel™ Digital platform, ... possible physiologic data when incorporating functional endpoints into ... to toxicology studies has evolved from short ECG ...
(Date:12/10/2014)... , Dec. 08, 2014 Research and ... the addition of the "Biometrics Market in ... http://photos.prnewswire.com/prnh/20130307/600769 ... projects such as rural banking and upgradation of ... trends witnessed in the market. Besides the aforementioned ...
Breaking Biology News(10 mins):Automated Border Control (ABC) Transforms the Global Travel Experience With More Than 2500 ABC eGates and APC Kiosks Deployed In Airports, Seaports, and Land Borders Worldwide 2New telemetry implants expected to change how large animal toxicology studies are conducted 2Biometrics Market in Japan 2014-2018: Key Vendors are DDS, Fujitsu, Hitachi and NEC 2
... -- A two-year study of college students at ... learn better and develop higher-level skills by participating ... teaching methods. Elsa Snchez and Richard Craig, ... surveyed students enrolled from 2003-2005 in their Plant ...
... -- We love it fresh, canned and frozen. It,s grown ... by the American Society of Horticultural Science, adds up to ... In other words, sweet corn is big business. Fresh ... July, with only ten percent of the annual volume marketed ...
... Two common dietary molecules found in legumes and ... of radiation, researchers from the University of Maryland ... human skin cells and a skin cancer-prone mouse ... damaging radiation found in sunlight, the team reported ...
Cached Biology News:Teamwork improves learning and career success 2How sweet is it? 2Antioxidants could provide all-purpose radiation protection 2Antioxidants could provide all-purpose radiation protection 3
(Date:12/17/2014)... (PRWEB) December 17, 2014 Gene ... that it has entered into a technology access ... (ADM) to apply DNA2.0’s proprietary protein engineering technology, ... process. , “We are extremely excited that the ... platform. This proprietary bioengineering technology has now ...
(Date:12/17/2014)... SOUTH SAN FRANCISCO, Calif. , Dec. 17, ... positive results of a Phase 2 study evaluating ... for the treatment of patients with severe, chronic ... the current standard of care, including topical steroids ... endpoint was percent change in Visual Analog Scale ...
(Date:12/15/2014)...  GlassesOff Inc. (OTCBB: GLSO) announced today the appointment ... director of the Company,s Board of Directors. ... its CEO until its acquisition by Stanley Black ... Recognized as the inventor of the first Wi-Fi-based Active ... -based RFID solutions focused on improving operational efficiency, safety ...
(Date:12/13/2014)... (PRWEB) December 12, 2014 Clarassance, a ... announced its new name: Therabron Therapeutics , Inc. ... and bronchioles (a type of structure in the lungs ... company’s mission to develop novel protein therapeutics for the ... directors decided to change the name to mark the ...
Breaking Biology Technology:ADM and DNA2.0 Enter Into Protein Engineering Technology Access and Service Agreement 2Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 2Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 3Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 4AeroScout Founder Joins GlassesOff's Board of Directors 2AeroScout Founder Joins GlassesOff's Board of Directors 3Maryland-based Biotech Company's Path Forward in Treating Respiratory Diseases Sparks Name Change 2
... Sept. 13 Genomatica announced today that ... company full time as executive chairman and chief business ... leading chemical producers, users, feedstock suppliers, brands and retailers. ... biotech leadership; $500 million in partnerships ...
... 10 PDL BioPharma, Inc. (PDL) (Nasdaq: PDLI ... all of the Company,s outstanding 2.75% Convertible Subordinated Notes, due ... Notes have been provided notice of the redemption by the ... holders who elect to convert their 2023 Notes into the ...
... Paratek Pharmaceuticals, Inc. today announced the Company,s lead ... the subject of several poster presentations at the ... (ICAAC).  Dr. Stuart Levy, co-founder and Chief Scientific ... talk at a symposium on antibiotic resistance at ...
Cached Biology Technology:Bill Baum Joins Genomatica as it Ramps for Commercial Rollout 2Bill Baum Joins Genomatica as it Ramps for Commercial Rollout 3Bill Baum Joins Genomatica as it Ramps for Commercial Rollout 4PDL BioPharma Provides Clarification Regarding Redemption of Its 2.75% Convertible Subordinated Notes 2Paratek to Present Clinical Data at the 50th Interscience Conference on Antimicrobial Agents and Chemotherapy 2Paratek to Present Clinical Data at the 50th Interscience Conference on Antimicrobial Agents and Chemotherapy 3
Ideal for chemical processing that requires downward flow of exhaust fumes. Powderful 1200 CFM blower draws fumes into sub-surface bonded charcoal filter for safe removal of organic vapors (final HEP...
... Shimadzus preparative LC/MS, using mass numbers as ... it ideal for performing investigation and research ... for both analytical and preparative operation. Switching ... in the software. This support provides a ...
... Label IT siRNA Tracker Intracellular Localization Kit ... label and deliver siRNA, of your design, ... in vitro tracking experiments. Subcellular localization and ... be monitored following introduction of the labeled ...
Selective media for Salmonella...
Biology Products: