Dating methods in history Adult web cam forum
" When applying our ancient DNA dating technology to modern genomes, we have seen that some populations have more ancient genomes than others, and this can be helpful in establishing individual origins " says Dr Esposito. Since the study of genetic disorders is closely tied up with questions of ancestry and population stratification, being able to analyse the homogeneity of populations is of vital importance to epidemiologists.
The researchers are currently compiling a larger dataset to increase the geographical/time coverage of their model and improve its accuracy.
Dr Umberto Esposito, a postdoctoral research in the laboratory of Dr Eran Elhaik, Department of Animal and Plant Sciences at the University of Sheffield, Sheffield, UK, will tell the annual conference of the European Society of Human Genetics today (Monday) that TPS can calculate the mixtures of DNA deriving from different time periods to estimate its definitive age.
"This introduces a completely new approach to dating.
One of the most important dating tools used in archaeology may sometimes give misleading data, new study shows - and it could change whole historical timelines as a result.
The science behind the dating method is fairly straightforward: nitrogen atoms in the atmosphere hit with cosmic radiation are converted into a type of carbon with eight neutrons." This permits us to open a powerful window on our past.The study of genetic data allows us to uncover long-lasting questions about migrations and population mixing in the past.Levels do happen to spike on a local and seasonal basis with changes in the carbon cycle, but carbon-14 is presumed to diffuse fast enough to ignore these tiny bumps.At least, that was the assumption until now."We know from atmospheric measurements over the last 50 years that radiocarbon levels vary through the year, and we also know that plants typically grow at different times in different parts of the Northern Hemisphere," says archaeologist Sturt Manning from Cornell University."So we wondered whether the radiocarbon levels relevant to dating organic material might also vary for different areas and whether this might affect archaeological dating."The tree rings were samples of Jordanian juniper that grew in the southern region of the Middle East between 16 CE.
Radiocarbon dating is a key tool archaeologists use to determine the age of plants and objects made with organic material.