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:3/30/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/lc9bnl/global_gesture ... Gesture Recognition Market in Automotive Sector 2014-2018" report ... Global Gesture Recognition market in Automotive Sector to grow ... Gesture recognition is the ability of a ... an individual. Gesture recognition technology can be 2D-based or ...
(Date:3/26/2015)... The Granite Club, ... club, today announced it has implemented a state-of-the-art access ... for members and staff, while restricting access to authorized ... selected FST,s IMID Access system because it has the ... and staff, in addition to unparalleled security," said ...
(Date:3/24/2015)... 24, 2015 Research and Markets ( ... "Global Iris Recognition Market 2015-2019" report to their ... Recognition market to grow at a CAGR of 23.5 ... covers the present scenario and the growth prospects of ... To calculate the market size, the report considers the ...
Breaking Biology News(10 mins):Global Gesture Recognition Market in Automotive Sector Report 2015 - Growing Number of Partnerships 2Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2Global Iris Recognition Market 2015-2019 with 3M Cogent, Bioenable Technologies, Cross Match Technology, Iris ID Systems & Safran Dominating 2
... therapies often succeed at initially eliminating the bulk ... but are eventually thwarted because they cannot eliminate ... cancer stem cells, which ultimately become the source ... by scientists at the University of Pittsburgh School ...
... New research from Colorado State University shows that the ... circadian -- or daily -- rhythms. The study, publishing ... current theory that only 10 percent to 15 percent ... scientists have long known that circadian rhythms regulate the ...
... temples and cultivated for its wood and cottony fibers, ... biologists have clung to for decades: the notion that ... continents were connected 96 million years ago. , Research ... colleagues shows that kapok---and perhaps other rainforest--trees colonized Africa ...
Cached Biology News:Cancer stem cells similar to normal stem cells can thwart anti-cancer agents 2Research finds that circadian rhythms dominate all life functions 2Research finds that circadian rhythms dominate all life functions 3The kapok connection -- Study explains rainforest similarities 2
(Date:3/30/2015)... March 30, 2015 Immunocore ... drugs to treat cancer, viral infections and autoimmune ... John Bell , the Regius Professor of ... Office for the Strategic Coordination of Health Research, ...      (Photo: http://photos.prnewswire.com/prnh/20150330/736483 ) ...
(Date:3/29/2015)... March 29, 2015  Caris Life Sciences® ... in small cell cervical cancer (SCCC) that ... Intelligence®, the company,s panomic, comprehensive tumor profiling ... which may explain sensitivities and resistance to ... of certain biomarkers may guide treatment strategies ...
(Date:3/27/2015)... NEW YORK , 27. März 2015 ... Vilcek Prize in Biomedical Science für seine ... wie Proteine zwischen Zellkompartimenten transportiert werden, sowie ... den Zellen zur Reaktion auf Stress nutzen, ... zusammenhängt. Dr. Walter ist Professor für Biochemie ...
(Date:3/27/2015)... March 27, 2015 WuXi PharmaTech (Cayman) ... R&D capability and technology platform company serving the ... today that an Investigational New Drug (IND) application ... rheumatoid arthritis has been accepted for review by ... In September 2012, MedImmune, the global ...
Breaking Biology Technology:Immunocore Appoints Professor Sir John Bell to its Board of Directors 2Immunocore Appoints Professor Sir John Bell to its Board of Directors 3Immunocore Appoints Professor Sir John Bell to its Board of Directors 4Immunocore Appoints Professor Sir John Bell to its Board of Directors 5Study Using Caris Molecular Intelligence Multiplatform Tumor Profiling Identifies Potential Treatment Strategies for Small Cell Cervical Cancer 2Study Using Caris Molecular Intelligence Multiplatform Tumor Profiling Identifies Potential Treatment Strategies for Small Cell Cervical Cancer 3Deutschstämmiger Zellbiologe Peter Walter gewinnt den Vilcek Prize in Biomedical Science 2015 2Deutschstämmiger Zellbiologe Peter Walter gewinnt den Vilcek Prize in Biomedical Science 2015 3Deutschstämmiger Zellbiologe Peter Walter gewinnt den Vilcek Prize in Biomedical Science 2015 4Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 2Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 3
... who led the technology solutions firm Fiserv through ... executives who will be inducted this month into the Wisconsin ... and chief operating officer from 1984 to 1999, when he ... relatively small private business to a publicly traded company reporting ...
... Modern developments in technology have provided people with ... and cell phones with digital audio capabilities. Technology ... have been considered fantasy 10 years ago are ... environment, companies must consider and understand how technology ...
... Sen. Ted Kanavas is taking aim at a series ... Gov. Jim Doyle . The latest target is an increase in ... revenue. , ,Kanavas, who has proposed tax reductions as part of ... be portrayed as a tax on business and not the consumer, ...
Cached Biology Technology:Making deals with evolving technologies in mind 2Making deals with evolving technologies in mind 3Making deals with evolving technologies in mind 4Making deals with evolving technologies in mind 5
UGT1A7 (E-15)...
Canine Aortic Smooth Muscle Cells (CnAOSMC) (>500,000 cells)...
... the third cytoplasmic loop of human D ... The immunizing peptide has 79% homology with ... form: Solution in phosphate buffered saline, pH ... method: IHC (p). Titertest values: immunohistochemistry ...
... Hot Start Taq Monoclonal ... before the onset of ... amplification and primer-dimer formation. ... raised, the antibody is ...
Biology Products: