Sentences with phrase «in ancient samples»

Wild type alleles in ancient samples are represented by yellow dots and derived alleles by red dots.

The absence of the extreme AMY2B copy number increase in these ancient samples indicates that the selective sweep associated with AMY2B expansion must have occurred well after the advent of agriculture and the Neolithic in Europe.

It is likely that these results are due to remnant postmortem damage artificially inflating variation in the ancient samples and elongating the branch lengths in the G - PhoCS analysis, as we detected an excess of private variants in all three ancient samples compared to European village dogs.

The two major advantages of this estimate are that (a) it only depends on previously discovered variable sites in higher coverage modern dogs (our genotype calling in ancient samples is likely to be much more accurate in such situations), and (b) it uses only a single chromosome from each population (which can be randomly picked), and thus does not require calling heterozygotes accurately (that is, it should not be sensitive to the lower coverage of our ancient samples).

Fats are a good target, adds George Cody, acting director of the Geophysical Laboratory of the Carnegie Institution for Science in Washington, D.C. — tough, plentiful, and known to survive in ancient samples from Earth.

She hoped that sequencing and analyzing the DNA in these ancient samples would offer new information about how polar bears evolved.

Sure enough, the team found methylated DNA in the ancient sample.

Not exact matches

I think being written only a few decades after these events is about as good a deal as you can get w / ancient history; same goes for finding early 2nd century samples of m in Egypt.

From Ancient India, through Persia, Babylon, Mesopotamia, Egypt, and the glory of Greece, the descriptions of each civilization's rise and decline are full of pictures and biographies that illuminate the times in colorful examples and poetic samplings.

Their work on ancient DNA from Viking Age horses is more promising: Kool and Boessenkool have collected about 100 samples, in different states of preservation, from which they hope to build a detailed picture of how equine populations moved and changed.

Researchers analyzed the levels of various trace elements in hundreds of samples of carbon - rich shales that had been deposited in oxygen - poor regions of the ocean surrounding ancient continents during the past 3.5 billion years.

An olive pit that happened to be cooking in a tabun (an ancient oven) at the moment of a violent destruction (such as an earthquake) was the best sample of all.

And they are looking for new samples of ancient material to fill in details about ancient events.

With this compelling demonstration of using ancient soil samples as proxies for regional climate in Asia, Caves now plans to extend his investigations elsewhere on the globe.

He and his colleagues had reconstructed the partial genome of a woolly mammoth found frozen in Siberia, and he was convinced that researchers like himself would soon be able to take bits of degraded tissue samples, extract ancient DNA and use them to piece together whole genomes of extinct animals.

The next step will be to gather more ancient samples from before and after a major environmental change — the end of a glaciation, for example, or the arrival of humans in the New World — to see whether any epigenetic changes correlate with the environmental transition.

One of the samples, in which a tick is hanging onto a dino feather, provides the oldest direct evidence of what these ancient parasites ate.

A research team led by John Tarduno of the University of Rochester in New York went to Australia's Jack Hills and collected ancient samples of rock containing the crystallized mineral zircon.

«It's almost as if we had traveled back in time and sampled the same plant that gave rise to cultivated peanuts from the gardens of these ancient people,» said David Bertioli, an International Peanut Genome Initiative, or IPGI, plant geneticist of the Universidade de Brasília, who is working at UGA.

It's possible, she suggests, that previous studies of ancient DNA didn't analyze enough samples to unearth the true amount of genetic diversity in the region's red deer.

By studying the magnetic orientations in pristine samples of ancient meteorites that formed 4.563 billion years ago, the team determined that the solar nebula lasted around 3 to 4 million years.

«There are lots of people who are interested in working on these ancient samples.

On a trip to collect DNA samples from ancient horse bones in Mongolia, Orlando got a whole new perspective on domestication.

(Boxes in chart represent ancient cats sampled in a DNA study.

In some of the e-mail messages, Dr. Mann refers to his assembly of data from a number of different sources, including ancient tree rings and earth core samples, as a «trick.»

Among the team's samples were nine ancient individuals — six males, two females, and a child of undetermined sex — from the Yamnaya culture north of the Black Sea in today's Russia.

The mtDNA sequence the researchers claimed to have obtained from the fossil is quite common in Europe today, making it difficult to rule out the possibility that someone not on the team touched the sample or the lab equipment used in the analysis, says evolutionary geneticist and ancient DNA expert Hendrik Poinar of McMaster University in Hamilton, Canada.

Beth Shapiro at the University of California, Santa Cruz, gets first dibs on the samples since her team will take on the most sensitive test, at greatest risk of contamination during handling: the search for ancient mammoth DNA in the layers of sediment.

Researchers in Dublin and York used the latest scientific techniques to extract ancient DNA and protein from tiny samples of parchment from documents from the late 17th and late 18th centuries.

In an unusual collaboration, this year the team brought along an ancient DNA expert to sample for ancient pathogens.

The collection includes stone tools and other artifacts, as well as fossilized bones of animals and ancient hominins, including the Neandertal bones that formed part of the sample used in three recent studies of Neandertal DNA.

The concrete sample examined at the Advanced Light Source by Berkeley researchers, BAI.06.03, is from the harbor of Baiae, one of many ancient underwater sites in the region.

Samples of ancient carbon deposits from this era show a marked increase in concentrations of carbon - 12 relative to its heavier isotope carbon - 13, indicating a lot of lighter carbon might have been suddenly released at the time.

Analysis of short DNA fragments from a pair of samples collected in India and Bhutan matched that of an ancient polar bear bone.

In addition to collecting DNA from hundreds of modern wolves as well as mutts and purebred dogs, the dual - origin researchers extracted DNA from dozens of ancient dogs, including a particularly high - value sample from a 4,800 - year - old animal unearthed in Newgrange, IrelanIn addition to collecting DNA from hundreds of modern wolves as well as mutts and purebred dogs, the dual - origin researchers extracted DNA from dozens of ancient dogs, including a particularly high - value sample from a 4,800 - year - old animal unearthed in Newgrange, Irelanin Newgrange, Ireland.

MIXED ANCESTRY Tiny samples taken from ancient European skulls, in a process shown here, yielded enough DNA for researchers to determine that farmers and foragers interbred in three different regions from 8,000 to nearly 4,000 years ago.

Similarly, all ancient samples contained a pbf allele that is common in corn but rare in teosinte.

New diagnostic techniques revealed traces of blood (inset, in blue) in microscopic samples from ancient African artifacts such as this one.

To help solve this conundrum, a team led by Richard Aronson of the Dauphin Island Sea Lab in Alabama decided to sample ancient staghorn coral rubble that was deposited over the past centuries.

Evolutionary biologist David Lambert of Griffith University in Australia and his team analyzed DNA samples taken from ancient tuatara bones and from living specimens.

He hopes to test samples of martian soil for ancient ribosomal RNA gene sequences that are conserved in all of Earth's known life forms.

It is illegal to remove archaeological samples from Egypt, so the researchers dated items from museum collections in Europe and North America, as well as freshly excavated seed samples from Tell es - Sakan on the Gaza Strip, which was an outpost of ancient Egypt.

Their prediction is based on a new method of interpreting data from magnetic traces found in ancient rock samples.

While visiting France a few years back, geologist John Spray of the University of New Brunswick in Canada chiseled some rock samples from the ancient Rochechouart crater in west - central France.

The team collected samples of methane from settings such as lakes, swamps, natural gas reservoirs, the digestive tracts of cows, and deep ancient groundwater, as well as methane made by microbes in the lab.

Daniel Bradley and Ceiridwen Edwards, geneticists at Trinity College Dublin, obtained samples from 23 ancient Irish bear fossils found in caves in Ireland as well.

These samples were analysed in China and also here at Leicester in the Starch and Residue Laboratory, School of Archaeology and Ancient History.

Warming and the seas — both on the rise Those ancient samples of sediment from 10 coastal wetlands in North Carolina provide some of the best evidence that sea - level rise closely follows warmer temperatures, Rahmstorf says.

Searches for cancer in ancient remains are plagued (no pun intended) by sampling errors — the signature of cancer can be detected in bones, but many skeletons are incomplete, and of course cancers do not always spread to bone after they originate in soft tissue.

Samples from this Ancient Roman pier, Portus Cosanus in Orbetello, Italy, were studied with X-rays at Berkeley Lab.