Chinese,sac longchmap pliage, American and Canadian scientists on Thursday announced their discovery of the fossil of a dinosaur that suffered tooth disease and lost a tooth.It is a key advance in scientists' understanding of how dental issues develop in dinosaurs,prada outlet, with an article in the latest volume of the Chinese Science Bulletin describing the 190 million-year-old fossil as "the first confirmed example of such dental pathology in a dinosaur."The article was coauthored by Prof. Zhang Jianping and doctorate candidate Xing Lida of the School of Earth Sciences and Resources at Beijing's China University of Geosciences; Prof. Bruce Rothschild of the University of Kansas in the United States; and Dr. Phil Bell of the Pipestone Creek Dinosaur Initiative in Canada,louboutin soldes, among other authors.Pathological or traumatic loss of teeth often results in the resorption and remodeling of the affected alveoli in mammals. However,air jordan retro 11, instances of alveolar remodeling in reptiles are rare,tory burch, the article says.Paleopathology is the study of disease and other abnormalities in the fossil record,tory burch outlet, it explains,coach outlet store online, adding that paleopathological investigations can "reveal unique insights into the behavior,louboutin pas cher, biology and development of extinct animals."The fossil was discovered in in 2007,pradamaindesignrain.com, when the Lufeng Dinosaurian Museum recovered an incomplete skull and several postcranial fragments of a new specimen of Sinosaurus from the Lufeng Basin in southwest China's Yunnan Province.Paleontologists found that the dinosaur's skull was missing a tooth,coachmaindesigners.com, but its alveolus was completely closed,longchamp, which was rare and possibly a pathological change. They conducted X-rays and CT scans on the specimen.The total closure of the dinosaur's alveolus and remodeling of the alveolar space indicate the animal survived for a lengthy period of time following the loss of the tooth,sac longchamp pas cher, the article says."This finding adds to the known range of dental pathologies found in theropods and contributes to mounting evidence suggesting theropods were highly resilient to a broad spectrum of traumas and diseases," it adds.
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As with the surge of extra U.S. soldiers that former President George Bush ordered into Iraq in 2007 to prevent the country disintegrating into ethnic and sectarian bloodshed,sac longchamp, experts say Nigeria's military needs a change of tactics that will motivate the population to actively cooperate with it.
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