Sentences with phrase «more ancient samples»
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.
https://www.newscientist.com/ Not exact matches
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.
Ancient DNA could potentially reveal much more: When compared to other Bronze Age samples from around Europe at this time, it could point to the homelands of the warriors as well as such traits as eye and hair color.
To estimate the density of ancient slabs, Klein compiled a large dataset of more than 1,400 previously analyzed samples of both modern rocks and komatiites — classic rock types that were around 3 billion years ago but are no longer produced today.
Labs that handle ancient specimens often handle more recent PCR samples as well, but the latter contain inordinately greater amounts of DNA.
They reconstructed and analyzed the genomes of 15 ancient samples of maize, comparing these data to a global collection of more than 2,500 modern lines.
«Extracting even a little more DNA is really important with ancient samples.»
Harvati hopes that further studies will include more samples and agrees that «ancient DNA would be extremely helpful.»
Both say that many more samples, especially of ancient dogs and wolves, are needed.
Anthropologist Shara Bailey, an expert in ancient human teeth at New York University in New York City, says that «the barium method is novel and appears to be even more powerful» than previous approaches, adding that despite small sample sizes, «the authors present a strong argument for the utility of this method for extrapolating weaning history.»
«We hope that our findings will highlight the importance for more extensive sampling and sequencing of both ancient and modern plague isolates around the world, and open up new research themes regarding the role played by Europe and West Asia in plague's evolution and ecology,» Bos says.
Additional support for population structure comes from the clustering of all the ancient samples within C1 into a sub-haplogroup distinct from that of modern dogs, while it is also noteworthy that non-C haplogroups, including A, are more apparent in Southeast Europe in the archaeological record12.
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).
In the lab, ancient bacteria from ice samples 420,000 years old, retrieved from more than 2 miles (3 km) inside the ice sheet, have quickly shown signs of life.
In addition to greatly condensing the amount of time it takes to extract and sequence old DNA, new techniques are allowing researchers to pluck sequenceable fragments from ever - more - ancient samples, providing genetic blueprints from long - forgotten epochs of evolution, migration, and ancestry.
To prove that one group spread eastward from Iran, scientists will need more DNA samples from ancient people east of the Fertile Crescent, says Christina Papageorgopoulou.
Because these samples were buried, they are believed to indicate the Martian environment in the more ancient past.
Remarkably, investigations of highly preserved human coprolites (ancient stool samples retrieved from archeological sites) have demonstrated that their overall microbiome more closely resembles that of modern humans living in traditional rural settlements than that of the contemporary urban dweller [117].