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Tag: "teeth" at biology news

Researchers trace evolution to relatively simple genetic changes

...e Mendelian trait that controls formation of hair, teeth and sweat glands. Darwin talked about 'the toothless men of Sind,' a pedigree (in India) that was striking because many of the men were missing their hair, had very few teeth, and couldn't sweat in hot weather. It's a very unusual constellation of sy...

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...e Mendelian trait that controls formation of hair, teeth and sweat glands. Darwin talked about 'the toothless men of Sind,' a pedigree (in India) that was striking because many of the men were missing their hair, had very few teeth, and couldn't sweat in hot weather. It's a very unusual constellation of sy...

UF Researchers Map Bacterial Proteins That Cause Tooth Loss

...that stakes a claim deep within the spaces between teeth and gums. It’s also the leading cause of tooth los...hat destroy the soft tissues and bone that support teeth to cause periodontal disease. Now scientists have identified the thousands of proteins the bacteriu...

Great White shark evolution debate involves WSU Lake Campus geology professor

...ately the length of a Greyhound bus and possessing teeth that were up to six inches long," explains Ciampag...on designs of shark teeth. "Our analysis of their teeth shows that Great White and mako sharks have very similar tooth growth trajectories, while those of t...

To control germs, scientists deploy tiny agents provocateurs

...form the green slime on rocks, the plaque on human teeth and the slippery film on ship hulls. If a single cell were analogous to one man, biofilms would be the "bacterial equivalent of mob mentality," says Blackwell. In the realm of health, biofilms are at the root of growing numbers of tenacious, and som...

Oldest cranial, dental and postcranial fossils of early modern European humans confirmed

...y have failed, but in the present attempt by using teeth as dating material reliable results were obtained. The findings are documented in the May 19 issue of Nature. "The dating results document that these samples are as old as we thought they should be," agree Maria Teschler-Nicola from the Natural His...

Researchers reveal secrets of flying snakes

...nal and opistoglyphous, or rear-fanged. These back teeth measure only 2 to 3 millimeters long and each has a small groove that runs along the fang's outer edge, where the venom drips down and into the prey. Whether or not the snake's choice of prey is related to its gliding ability is unknown. ...

Revueltosaurus skeleton unearthed at Petrified Forest upsets dinosaur tale

...erely disappoint rockhounds, who sell the abundant teeth as "dinosaur teeth," but it also throws into quest...rnithischians outside South America. "Because the teeth look like those we know from herbivorous ornithischians, people assigned them to the dinosaurs," sai...

Agilent Technologies introduces high-capacity human protein removal system for proteomics research

...erely disappoint rockhounds, who sell the abundant teeth as "dinosaur teeth," but it also throws into quest...rnithischians outside South America. "Because the teeth look like those we know from herbivorous ornithischians, people assigned them to the dinosaurs," sai...

Researchers find first evidence of venom system in extinct mammal

... natural design of the tooth. "The groove in these teeth would have acted as a gutter, conducting fluid fro...eus browni fossil was the first time they had seen teeth like this preserved within an intact upper and lower jaw, which is extremely rare for a specimen thi...

Mechanism regulating tooth shape formulation found

...forming cusps were much broader resulting in cheek teeth whose shape resembles more rhinoceros teeth than mouse teeth. Furthermore, these mice have extra teeth and sometimes adjacent teeth are fused. T...

Neanderthal teeth grew no faster than comparable modern humans'

...ed on our study of the enamel of these Neanderthal teeth and other modern ones, we can't support the claim ...conclusion are microscopic lines on the outside of teeth that mark the incremental growth of enamel on a young tooth. Like tree rings that can gauge the age ...

Ancient DNA confirms single origin of Malagasy primates

... of Sciences. Radiocarbon dating of the bones and teeth from which the DNA was obtained reveal that each of the individuals analyzed died well over 1,000 years ago, according to the senior author, Anne Yoder, associate professor in the Department of Ecology and Evolutionary Biology. Living lemurs compris...

The roots of civilization trace back to ... roots

...e evidence lies in the fossil record, specifically teeth and jaws. The teeth and jaws of savannah dwelling apes evolved into large massive jaws, jaw muscles and molars, ideal fo...

“Hitchhiking?Viruses as Cancer Drug Delivery System

...e evidence lies in the fossil record, specifically teeth and jaws. The teeth and jaws of savannah dwelling apes evolved into large massive jaws, jaw muscles and molars, ideal fo...

Did humans cause ecosystem collapse in ancient Australia?

...ironment contained in ancient eggshells and wombat teeth over the last 140,000 years to reconstruct what ha...he study Marilyn Fogel of Carnegie. "Eggshells and teeth both contain evidence of these animals' diets in different forms of carbon. All three animals were p...

Molecular mechanism of feather formation found

...lved in the embryonic development of limbs, lungs, teeth and the gut. In the current study, appearing in the Aug. 16 Proceedings of the National Academy of Sciences (PNAS Online, Aug. 8), Fallon's team and collaborators showed that during the development of barbs-filamentous structures that form the feath...

New tooth enamel dating technique could help identify disaster victims

... it worked," he said. "And if you look at multiple teeth formed at different times, you can get (the age ra... he said. Buchholz and his colleagues analyzed 33 teeth from 22 different people whose ages were known. The enamel separations were done at the Karolinska I...

Fluoride poisoning in China due to clay, not coal

...g from consuming too much fluoride. It makes their teeth discoloured and fragile, and in severe cases can distort bones, stiffen joints and lead to paralysis. In Guizhou province, where the problem is most serious, there were 10.5 million cases of dental fluorosis and just over half a million cases of skel...

New technology shows our ancestors ate…everything!

...ut the diets of our early ancestors. By comparing teeth from two species of early humans, Australopithecus africanus and Paranthropus robustus, the researchers confirm previous evidence that A. africanus ate more tough foods, such as leaves, and P. robustus ate more hard, brittle foods. But they also reve...

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