Tag: "tooth" at biology news

Back to the future: Mastodon extends the time limit on DNA sequencing

...illion years ago. The sequence was obtained from a tooth dated to 50,000130,000 years ago, increasing the specimen age for which such palaeogenomic analyses have been done by almost a complete glacial cycle. The mastodon becomes only the third extinct taxon for which the complete mitochondrial genome is kn...

Manchester University helps with pharaoh DNA analysis

...Egyptologists in Cairo announced last month that a tooth found in a wooden box associated with Hatshepsut e... mummy was that of the lost queen, pointing to the tooth as evidence. The preliminary DNA evidence to be included in a Discovery Channel documentary being...

Wolves of Alaska became extinct 12,000 years ago, scientists report

... The ancient wolves suffered many broken teeth and tooth fractures, she said. Van Valkenburgh has also studied tooth fractures in ancient animals at Los Angeles Rancho La Brea Tar Pits and in modern lions, tigers, leo...

American Chemical Society's Weekly PressPac -- June 20, 2007

...new era in recycling of plastics Wine may combat tooth decay and upper respiratory tract disease bacteria...TICLE #3 FOR IMMEDIATE RELEASE Wine may combat tooth decay and upper respiratory tract disease bacteria Journal of Agricultural and Food Chemistry B...

Specialized, bone-crushing wolves of Alaska disappeared long ago

...they report. Moreover, the animals skull shape and tooth wear, as well as a chemical analysis of their bone...alkenburgh said. In addition, the studies of their tooth wear and fracture rate showed high levels of both, consistent with regular and frequent bone-crackin...

Gum disease in postmenopausal women linked to oral bone loss

...Loss of alveolar crest bone eventually can lead to tooth loss. The association between bacterial infection and oral bone loss turned out to be strongest in overweight women, compared to normal weight or obese women. We expected to see an increased risk for oral bone loss with increasing body mass inde...

From the deep -- Researchers find new species of sea anemone

...t the size of a human molar, and even looks like a tooth with small tentacles on one side. Daly and Luciana Gusmo, a doctoral student in Daly's laboratory, describe A. pearseae in detail in a recent issue of the Journal of Natural History. The two assigned the anemone to the genus Anthosactis primarily d...

New nanocomposites may mean more durable tooth fillings

...has the potential to lessen that toll by producing tooth restorations that are both stronger than any decay...ulting paste into the cavity, and illuminating the tooth with a light that causes the paste to polymerize and harden. For decay-fighting composite fillings, ...

Ancient amphibians evolved a bite before migrating to dry land

... ate. Living fish exhibit an incredible array of tooth and jaw shapes, suggesting that, ironically, direct analysis of fossil jaws would be a less precise means of determining the feeding methods of extinct species, Markey says. "Analysis of the sutures of the early amphibian species Acanthostega reve...

Scientists decode genome of oral pathogen

...ds." Although it is not directly associated with tooth decay or gum disease, S. sanguinis is a prominent member of dental plaque. "Genomic studies of this organism will also help us better understand the formation of dental plaque and the initiation of oral diseases," added Macrina. The team reported t...

JCI table of contents: April 2, 2007

... a genetic mutation in PLEKHM1 caused the bone and tooth defects observed in incisors absent rats. A mutation in the same gene was associated with disease in a human patient with osteopetrosis. Bone cells known as osteoclasts from both this patient and incisors absent rats were impaired in their ability to...

NYUCD study links tooth decay and gum infections to ethnicity and country of origin

...r example, some ethnic groups may be more prone to tooth decay partly because their traditional foods are h...ridated water supply to provide protection against tooth decay. Heredity can play a role, as well. Some ethnic groups may be more susceptible to decay-causin...

Root beer may be 'safest' soft drink for teeth

...ntal erosion? Dental erosion involves loss of tooth structure. Erosion refers to the action of the...al cavities are not exactly the same. Cavities and tooth decay tend to be isolated to cavity-prone areas such as in between teeth and in pits and grooves. ...

How long is a child a child?

...and developmental analysis, the team reconstructed tooth growth and determined the age at death of a fossil...roccan fossil child showed an equivalent degree of tooth development to living human children at the same age. These findings and other evidence suggest that...

These legs were made for fighting

...rrier used male-female body size ratios and canine tooth size ratios as numerical indicators for aggressiveness because field studies of primates have used varying criteria to rate aggression. He says it would be like having a different set of judges for each competitor in subjective Olympic events like di...

Tips from the Journals of the American Society for Microbiology

...ECC) is an extremely destructive form of bacterial tooth decay generally involving multiple teeth. Although previous studies have indicated Streptococcus mutans as a potential agent, researchers have yet to determine if S-ECC is caused by a single strain of bacteria or a group of bacterial species. Prior...

Other highlights in the Jan. 17 JNCI

...o earlier studies had found an association between tooth loss (periodontitis is the primary cause of tooth loss in adults) and pancreatic cancer. In the new study, Dominique S. Michaud, Sc.D., of the Harvar...

USC-led researchers use stem cells to regenerate parts of teeth

...ongtao Shi, DDS, PhD, has successfully regenerated tooth root and supporting periodontal ligaments to restore tooth function in an animal model. The breakthrough holds significant promise for clinical application in...

USC-led researchers use stem cells to regenerate parts of teeth

...ongtao Shi, DDS, PhD, has successfully regenerated tooth ro ot and supporting periodontal ligaments to restore tooth function in a swine (an animal) model. The breakthrough holds significant promise for clinical appl...

Dental crowns reveal the diet of a species

According to recent research, the complexity of tooth surfaces reveals the diet of a species. Scientists at the University of Helsinkis Institute of Biotechnology and Department of Geology showed that the more complex the surface of an animal's teeth, the greater the share of vegetables in its diet. For...

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