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:7/11/2014)... from Ume University, Sweden, have explored two different ... reaction sequence leading to the formation of oxygen ... published in the scientific journal Nature Communications ... present day synthetic catalysts for water oxidation, which ... for the direct storage of solar energy in ...
(Date:7/11/2014)... that transplantation of mesenchymal stem cells can stimulate neurogenesis ... of Alzheimer,s disease (AD) and improve tissue and function ... are reported on the therapeutic effect of adipose-derived stem ... the effect on oxidative injury and neurogenesis in the ... team, School of Life Sciences, Tsinghua University, China transplanted ...
(Date:7/11/2014)... Evidence exists that cannabinoid receptor type 1 ... Ca2+ influx, and reduce neurotransmitter release. However, ... 1 can increase extracellular Ca2+ influx and ... his team, Tongji Hospital Affiliated to Tongji ... Technology, China used whole cell voltage-clamp and ...
Breaking Biology News(10 mins):Molecular snapshots of oxygen formation in photosynthesis 2
... electronic skin, or e-skin, and electronic eye implants or ... Researchers with Berkeley Lab and the University of California ... of carbon nanotubes and silver nanoparticles similar to the ... e-whiskers respond to pressure as slight as a single ...
... of men,s bones - but only if they marry when they,re ... In a study published online in the peer-reviewed journal Osteoporosis ... were younger than 25 had lower bone strength than men who ... In addition, men in stable marriages or ...
... climate. Take, for example, the Mayans, who, throughout the ... their major ceremonial centers after a series of multi-year droughts, ... forests. Much later, in the late 20th century, frequent droughts ... migrate from the dry north to the wetter south where ...
Cached Biology News:E-whiskers 2Guys: Get married for the sake of your bones, but wait until you're 25 2Guys: Get married for the sake of your bones, but wait until you're 25 3Princeton model anticipates ecological impacts of human responses to climate 2Princeton model anticipates ecological impacts of human responses to climate 3
(Date:7/13/2014)... 13, 2014 2014 Deep Research Report ... professional and in-depth study on the current state of ... The report provides a basic overview of the industry, ... analysis and Chinese domestic market analysis are provided with ... of the market. A comparison between the international and ...
(Date:7/11/2014)... , July 11, 2014 Research and ... Transfection Technology Market - Global Industry Analysis, Size, Share, ... their offering. http://photos.prnewswire.com/prnh/20130307/600769 ... nucleic acids (either DNA or RNA) into cells. This ... of cancer cells and protein metabolism by affecting the ...
(Date:7/11/2014)... SEATTLE , July 11, 2014  Researchers ... navigate three-dimensional images. The new technology, called Virtual ... of small structures like neurons and synapses using ... Finger,s unique technology makes 3D imaging studies orders ... resources at an unprecedented level across many areas ...
(Date:7/10/2014)... 10, 2014 Deep Knowledge Ventures ... Forum on ‘Commercialising Longevity Research’ and welcomed a ... the London Bioscience Innovation Center for the event, ... Aging Analytics Ltd. The meeting highlighted the need ... research for age-related disease, as well as the ...
Breaking Biology Technology:2014 Nano Silver Industry in Global and China Regions Development Proposals Analysis Available at DeepResearchReports.com 22014 Nano Silver Industry in Global and China Regions Development Proposals Analysis Available at DeepResearchReports.com 3International Transfection Technology Market - Industry Analysis, Size, Share, Growth, Trends and Forecast to 2019 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 2DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 3DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 4DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 5DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 6
... , for routine high fidelity amplification of up to 3.5 kb , ... 100 units , Cat. No. 1 664 955 ... , , Description , , , ... archaebacterium Pyrococcus woesei. The enzyme has a molecular weight of , ...
... , for routine amplification of up to 3 kb genomic DNA ... , , , , , ... contains 10 vials of 2x concentrated PCR reaction , mix (Taq ... dNTPs) plus water PCR grade (for dilution), sufficient for 100 , ...
... for amplification of up to 5 kb targets from genomic DNA ... , , , , , ... concentrated High Fidelity PCR Master contains all necessary , reagents ... a unique enzyme blend of Taq DNA Polymerase and Pwo DNA Polymerase[a thermostable , ...
Cached Biology Technology:Pwo DNA Polymerase 2Pwo DNA Polymerase 3PCR Master 2PCR Master 3High Fidelity PCR Master 2