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InvestigativeTechniques

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Hairs, feathers and scales have a lot in common

The potential evolutionary link between hairs in mammals, feathers in birds and scales in reptiles has been debated for decades. Today, researchers demonstrate that all these skin appendages are homologous. On the basis of analyses of embryonic development, the biologists evidenced molecular and micro-anatomical signatures that are identical between hairs, feathers and scales at their early developmental stages. These observations indicate that the three structures evolved from their common reptilian ancestor.  
sciencedaily.com
about 3 years ago
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177

Cardiac Catheterization

Cardiac catheterization procedure can diagnose a variety of heart conditions and determine the health of your coronary arteries, heart valves, and heart muscle.  
youtube.com
about 3 years ago
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296

Coronary Angioplasty and Stenting

Coronary angioplasty and stenting is done to open up blood vessels in the heart. You may need the procedure after a heart attack, or if your vessels are clog...  
youtube.com
about 3 years ago
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AEA - American Evaluation Association : Home

American Evaluation Association  
eval.org
about 3 years ago