Tag Archives: tooth

Asteroid that Killed the Dinosaurs also Wiped out the ‘Obamadon’

The asteroid collision widely thought to have killed the dinosaurs also led to extreme devastation among snake and lizard species, according to new research — including the extinction of a newly identified lizard Yale and Harvard scientists have named Obamadon gracilis.

“The asteroid event is typically thought of as affecting the dinosaurs primarily,” said Nicholas R. Longrich, a postdoctoral associate with Yale’s Department of Geology and Geophysics and lead author of the study. “But it basically cut this broad swath across the entire ecosystem, taking out everything. Snakes and lizards were hit extremely hard.” (more…)

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“Painless” Plasma Brush is Becoming Reality in Dentistry, MU Engineers Say

*Hi-tech dental instrument uses “cool flame” for sturdier and longer-lasting fillings*

COLUMBIA, Mo. – University of Missouri engineers and their research collaborators at Nanova, Inc. are one step closer to a painless way to replace fillings. After favorable results in the lab, human clinical trials are underway on the “plasma brush.”

In less than 30 seconds, the plasma brush uses chemical reactions to disinfect and clean out cavities for fillings. In addition to the bacteria-killing properties, the “cool flame” from the plasma brush forms a better bond for cavity fillings.  The chemical reactions involved with the plasma brush actually change the surface of the tooth, which allows for a strong and robust bonding with the filling material. (more…)

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Genome of Extinct Siberian Cave-dweller Linked to Modern-day Humans

*Sequencing of ancient DNA reveals new hominin population that is neither Neanderthal nor modern human*

Researchers have discovered evidence of a distinct group of “archaic” humans existing outside of Africa more than 30,000 years ago at a time when Neanderthals are thought to have dominated Europe and Asia. But genetic testing shows that members of this new group were not Neanderthals, and they interbred with the ancestors of some modern humans who are alive today.

The journal Nature reported the finding this week. The National Science Foundation’s Behavioral and Cognitive Sciences Division partially funded the research. (more…)

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