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Message: 1
From: National Science Foundation Update <nsf-update@xxxxxxx>
Date: Wed, 2 Sep 2009 16:15:08 -0500 (CDT)
Subject: Secrets of the Four Chambers Revealed by Reptile Hearts
Secrets of the Four Chambers Revealed by Reptile Hearts
The first genetic link in the evolution of the heart from three-chambered to four-chambered has been found, illuminating part of the puzzle of how birds and mammals became warm-blooded.
Frogs have a three-chambered heart. It consists of two atria and one ventricle. As the right side of a frog's heart receives deoxygenated blood from the body, and the left side receives freshly oxygenated blood from the lungs, the two streams of blood mix together in the ventricle, sending out a ...
This is an NSF News item.
Message: 2
From: National Science Foundation Update <nsf-update@xxxxxxx>
Date: Wed, 2 Sep 2009 16:16:17 -0500 (CDT)
Subject: Dead Ahead: Similar Early Warning Signals of Change in Climate, Ecosystems, Financial Markets, Human Health
What do abrupt changes in ocean circulation and Earth's climate, shifts in wildlife populations and ecosystems, the global finance market and its system-wide crashes, and asthma attacks and epileptic seizures have in common?
According to a paper published this week in the journal Nature, all share generic early-warning signals that indicate a critical threshold of change dead ahead.
In the paper, Martin Scheffer of Wageningen University in The Netherlands and ...
This is an NSF News item.
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