Navigation Links
Avian origins: new analysis confirms ancient beginnings
Date:2/5/2008

es of time they occur (or "tick") at a fairly constant rate. Molecular biologists use that rate to reconstruct evolutionary history.

"If we know, for example, that DNA sequences diverge by an average of two percent every million years, and we determine that two species differ genetically by ten percent, we can figure out that they last shared a common ancestor five million years ago," Brown said. The problem is, "different lineages can 'tick' at different rates, so applying a single rate to an entire tree could lead to very suspect results."

Fortunately, new methods exist for compensating for differing rates.

"What my colleagues and I did was apply all of these new methods to the problem of the origin of modern birds, with each method making different assumptions about how mutation rate changes across the tree," Brown said. He hoped the analysis would narrow the gap between fossil and molecular data, but in fact it only reinforced the rock-clock split by underscoring the finding that modern birds arose more than 100 million years ago.

So where does that leave the contentious camps of scientists trying to solve the puzzle of how the world's 10,000 bird species came about"

"Rather than fighting across groups, we now have the joint goal of explaining this rock-clock gap," Brown said. "Resolution of the issue will be fertile ground for future research for a while to come."


'/>"/>

Contact: Nancy Ross-Flanigan
rossflan@umich.edu
734-647-1853
University of Michigan
Source:Eurekalert

Page: 1 2

Related biology news :

1. MIT finds key to avian flu in humans
2. Smiths Detection to launch a portable diagnostic system for foot-and-mouth disease and avian flu
3. New field-deployable biosensor detects avian influenza virus in minutes instead of days
4. Analysis calls for medical device information to better serve patients and doctors
5. More comprehensive analysis of Klamath River basin needed to aid decision makers
6. Human clones: New U.N. analysis lays out worlds choices
7. Powerful integration of lipid metabolic profiling with gene expression analysis
8. Tumor genome analysis unveils new insights into lung cancer
9. Analysis of breast and colon cancer genes finds many areas of differences between tumors
10. Interacting protein theory awaits test from new neutron analysis tools
11. DNA analysis shows true dispersal of protozoa
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/5/2015)... New York , August 5, 2015 ... market report titled "Facial Recognition Market - Global Industry ... 2022", the global market for facial recognition is forecast ... is driven by increased demand for surveillance systems by ... the rising number of crimes and terrorist activities across ...
(Date:7/31/2015)... Den 10. internationale konference om Genomik (ICG-10, ... - 25. oktober i Shenzhen , ... i år. Siden starten i 2006 er ICB blevet ... og er en af de mest dynamiske, entusiastiske og ... nylige gennembrud og fremskridt inden for ,omik,-forskning, som yderligere ...
(Date:7/31/2015)... China , 31. Juli 2015 Die 10. ... wird von BGI veranstaltet und findet vom 22. ... China , statt. Die ... Seit ihrem Start 2006 ist die ICG weltweit ... „omik" geworden. Sie ist eines der dynamischsten, enthusiastischsten ...
Breaking Biology News(10 mins):Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 3Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 4Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 5Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 6Den 10. internationale konference om Genomics (ICG-10) åbner i oktober 2Die 10. internationale Konferenz zu Genomik (ICG-10) beginnt im Oktober 2Die 10. internationale Konferenz zu Genomik (ICG-10) beginnt im Oktober 3
... JUPITER, FL, April 13, 2011 Using advanced imaging technology, ... have identified a change in chemical influx into a specific ... fundamental to long-term memory. The study was published ... of Neuroscience . "In studying fruit flies, learning and ...
... Frog and toad skins already are renowned as ... report in ACS,s Journal of Proteome Research ... abundance of antibacterial and antiviral substances that could inspire ... colleagues point out that scientists know little about the ...
... of forest byproducts and crustacean shells may be the ... from North Carolina State University have found. "As ... health risks posed by nuclear accidents is radioactive iodide ... identical to non-radioactive iodide, the human body cannot distinguish ...
Cached Biology News:Scripps Research scientists identify mechanism of long-term memory 2
(Date:8/28/2015)... India , August 28, 2015 ... by Product (Media, Sera, Cryogenic Storage Systems, Thawing Equipment, ... (Therapeutic, Regenerative Medicine, Clinical Trials), End User - Global ... Market is expected to reach USD 3,731.03 Million by ... a CAGR of 11.65% between 2015 and 2020. ...
(Date:8/28/2015)... (PRWEB) , ... August 28, 2015 , ... ... Personalized Medicine, presented two studies at the International Spine Intervention Society’ ... 28th, 2015 through to August 1st, 2015. With a focus on evidence-based research ...
(Date:8/28/2015)... ... August 28, 2015 , ... Pittcon is pleased to ... a session on chemical spectroscopic imaging at JASIS 2015 (Japan Analytical & Scientific ... analytical and scientific instruments show which will be held at International Conference Hall ...
(Date:8/28/2015)... /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) ... on the development of autologous cell therapies, today ... 30, 2015, corporate highlights, and near-term milestones.  The ... at www.sedar.com ,  www.edgar.com and ... expects to launch its RCS-01 treatment for aging ...
Breaking Biology Technology:Biopreservation Market Worth 3,731.03 Million USD by 2020 2Biopreservation Market Worth 3,731.03 Million USD by 2020 3Biopreservation Market Worth 3,731.03 Million USD by 2020 4Biopreservation Market Worth 3,731.03 Million USD by 2020 5Proove Biosciences Presents New Research Study at the International Spine Intervention Society’s Annual Scientific Meeting 2Proove Biosciences Presents New Research Study at the International Spine Intervention Society’s Annual Scientific Meeting 3Proove Biosciences Presents New Research Study at the International Spine Intervention Society’s Annual Scientific Meeting 4U.S. Symposium on Imaging Organized by Pittcon’s Program Chairman Chuck Gardner 2U.S. Symposium on Imaging Organized by Pittcon’s Program Chairman Chuck Gardner 3RepliCel Reports Second Quarter 2015 Financial Results 2RepliCel Reports Second Quarter 2015 Financial Results 3RepliCel Reports Second Quarter 2015 Financial Results 4RepliCel Reports Second Quarter 2015 Financial Results 5
... Catalysts Expected in Next Six Months -, BRISBANE, Calif., ... results from operations for the second,quarter and six months ended ... quarter of 2008 of $26.5 million, or $0.68 per share,compared ... share, in the,second quarter of 2007., Dan Welch, Chairman, ...
... Jay Bigelow, President of MicroMass,Communications, Inc., a leader ... PharmaVOICE magazine as one of the 100 most,inspiring ... The honor was announced in the July/August ... leaders in all areas of the pharmaceutical,industry. Candidates ...
... testing capabilities, BIRMINGHAM, Ala., July 31 ... that its VAP(R) Cholesterol Test,is now included ... The announcement means that the VAP ... more areas of risk than the standard ...
Cached Biology Technology:InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 2InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 3InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 4InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 5InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 6InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 7InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 8InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 9InterMune Reports Second Quarter 2008 Financial Results and Business Highlights 10MicroMass President Jay Bigelow Named to PharmaVOICE List of 100 Most Inspiring and Influential Leaders in the Life Sciences 2MicroMass President Jay Bigelow Named to PharmaVOICE List of 100 Most Inspiring and Influential Leaders in the Life Sciences 3VAP(R) Cholesterol Test Bolsters Biophysical(R) Health Assessment 2VAP(R) Cholesterol Test Bolsters Biophysical(R) Health Assessment 3
Attoglow Western Blot Enhancing Kit contains Millennium Enhancer which can significantly boost Western blot signals, and is compatible with other enhancing mechanisms to achieve multiplied enhancing ...
...
Borosilicate Glass. Certified for use with the Beacon 2000 Systems, 1,000 tubes/case...
Although each Beacon 2000 System includes one preinstalled sample chamber (size specified at time of order), optional chambers are available and easily retrofit by the user....
Biology Products: