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Tag: "dating" at biology news

Jefferson scientists identify gene defect leading to abnormal skin development and cancer

...ne of the earliest relics of vertebrate evolution, dating back nearly 400 million years, before the evolution of jaws and bony skeletons. The species parasitizes other fish by attaching with their circular, toothy mouths and sucking the body juices. A single lamprey will feed for about a year, consuming on ...

Scientists narrow the time limits for the human and chimpanzee split

...ery of new fossils and the improvement in geologic dating of existing fossils," says Walker. ...

Leading lampreys to slaughter: Pheromone for scourge of Great Lakes identified

...ne of the earliest relics of vertebrate evolution, dating back nearly 400 million years, before the evolution of jaws and bony skeletons. The species parasitizes other fish by attaching with their circular, toothy mouths and sucking the body juices. A single lamprey will feed for about a year, consuming on ...

Scientists sequence DNA of woolly mammoth

...tely 28,000 years old, as was shown by beta-carbon dating analysis. This was a surprising finding, as it demonstrated that the analyzed material was frozen for more than 10,000 years before the maximum of the last ice age. The research team used a computational approach to demonstrate that an unprecedente...

Restaurant seafood prices since 1850s help plot marine harvests through history

...eafood prices collected from U.S. restaurant menus dating to the 1850s will help plot the shifting harvest o...have declined in numbers and size based on records dating from the 1870s ?illuminating details of productivity in the North Sea 130 years ago; * How archa...

India's smoking gun: Dino-killing eruptions

... known ages of the traps gathered from radiometric dating with magnetic fields frozen in the rocks. Volcanic rocks record information about the Earth's magnetic field with magnetic minerals that align with Earth's field like millions of tiny compasses before the lava cools. When the lava solidifies, the com...

New tooth enamel dating technique could help identify disaster victims

...edish forensic scientists already have used enamel dating to help narrow the search for victims of last Dece... officials are providing information on the enamel dating technique to federal agencies as part of the Laboratory's scientific and technical assistance in res...

Ancient DNA confirms single origin of Malagasy primates

... of the National Academy 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....

Neanderthal teeth grew no faster than comparable modern humans'

...people from southern Africa, and Inuit from Alaska dating from 500 B.C. until the present. "We chose these three groups since they would provide a good cross-section of various populations from different regions of the world," she said. "We feel that they give us some insights into the variation that exis...

Ebola virus: from wildlife to dogs

... virus antibodies, several of the positive samples dating from before the first epidemics in these countries. These results therefore indicate that chimpanzees are regularly in contact with the animal virus reservoir and that some of them develop non-fatal infections. The presence of specific antibodies in ...

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

...USA recently conducted the first successful direct dating of the material. Several previous attempts to radi...iled, 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....

Oldest fossil human protein ever sequenced

...rotein from a Neanderthal from Shanidar Cave, Iraq dating to approximately 75,000 years old. This is the oldest fossil human protein ever sequenced. The research will be published the week of March 7-11 in the online early edition of Proceedings of the National Academy of Sciences (PNAS). "This research o...

Small species back-up giant marsupial climate change extinction claim

...sion of grassland. To verify their results carbon dating was performed on samples. And further work, due to be published later in the year, on other sites in the region confirm the stratification of fossils in the creek bed. The dig also failed to unearth evidence of human activity, suggesting they didn't...

50-year-old Mystery Solved: Protein Tags Regulate Key Ion Channel

...2005 issue of the journal Cell, answers a question dating back to the 1950s: How do cells control the background movement of potassium ions across the cell membrane? This process is important because the flow of potassium ions determines whether "excitable" cells in the brain, heart and skeletal muscles "fi...

Scientists find fossil proof of Egypt's ancient climate

... isotopic analyses of about 20 snails, all of them dating to the humid phase, which occurred approximately 130,000 years ago. These particular snails have a life span of between one and two years, and build their shells in a classic spiral with whatever water is available that day. The snails were preserved...

New Clues Add 40,000 Years to Age of Human Species

...southern Ethiopia. By applying modern radiometric dating techniques and a careful study of sediments and fo... its moister climates of the past. But, precisely dating the outcrops required volcanic minerals with elements that undergo radioactive decay. Brown and McD...

The secret lives of whales

...to penetrate over a million years of whale history dating back to the middle of the last series of Ice Ages. Using whale samples from the Japanese meat market, where Antarctic minke whales killed for “scientific research?are legally sold as food, Palumbi examined variations in mitochondrial DNA from indivi...

Poor prenatal nutrition permanently damages function of insulin-producing cells in the pancreas

...altered in any way, they mated females with males, dating the day of their pregnancy, which lasts three weeks. They separated the mothers into two groups. The control group ate as much chow as they wanted during the entire pregnancy. The other group also was fully nourished during the first two weeks but un...

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