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Original Americans came from Siberia 23,000 years ago, study reveals

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New York: The first people to reach the Americas came from Siberia, now in Russia, in a single group around 23,000 years ago, at the height of the last Ice Age, says a new study.

picture from- www.offroadexpedition.com
picture from- www.offroadexpedition.com

After reaching Alaska, they apparently hung out in the north – perhaps for thousands of years – before spreading throughout North and South America, said the study based on genomic analysis.

The findings dispel the popular idea that Polynesians or Europeans contributed to the genetic heritage of Native Americans.

The study revealed that the the first people to reach the Americas used a land bridge between Siberia and Alaska called Beringia.

“There is some uncertainty in the dates of the migration and the divergence between the northern and southern Amerindian populations. But as we get more ancient genomes sequenced, we will be able to put more precise dates on the times of migration,” said one of the study authors Yun Song, associate professor at University of California, Berkeley.

The analysis, using the most comprehensive genetic data set from Native Americans to date, was conducted using three different statistical models.

The data consisted of the sequenced genomes of 31 living Native Americans, Siberians and people from around the Pacific Ocean, and the genomes of 23 ancient individuals from North and South America, spanning a time between 200 and 6,000 years ago.

The international team concluded that the northern and southern Native American populations diverged between 11,500 and 14,500 years ago.

The southern branch peopled Central and South America as well as part of northern North America. The findings will be presented in the forthcoming issue of the journal Science.

“The diversification of modern Native Americans appears to have started around 13,000 years ago when the first unique Native American culture appears in the archaeological record: the Clovis culture,” said Rasmus Nielsen, a professor at the California university.

“We can date this split so precisely in part because we previously have analysed the 12,600-year-old remains of a boy associated with the Clovis culture,” Nielsen added.

(IANS)

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Indian Expert Claims that Russia Might help India in Nuclear Medicine

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Nuclear power must be developed.
Vladimir Putin and Narendra Modi in a conversation. Wikimedia Commons.

Given the current high costs of making radioisotopes used in nuclear medicine, there is considerable scope of collaboration between India and Russia for their manufacture at affordable cost, according to an Indian expert.

Chandigarh-based Postgraduate Institute of Medical Education and Research (PGIMER) Professor Baljinder Singh told IANS here on the sidelines of the just-concluded 10th Atomexpo organised by Russian state nuclear energy corporation Rosatom that such cooperation has become essential in view of the global shortage of molybdenum, isotopes of which are used in tens of millions of medical diagnostic procedures annually.

The molybdenum isotope 99mTc, for instance, is the most commonly used medical radioisotope worldwide.

“The molybdenum daughter radionuclide 99mTc is used the world over for imaging on gamma cameras,” Singh said.

“Most nuclear reactors have molybdenum as a by-product — there is a shortage of which globally.”

Singh, who is a jury member at the Atomexpo2018 for selecting the best research projects in the category “Nuclear Technologies for better Healthcare”, pointed out that as a leader in civilian nuclear technology, India is among a few countries making “significant” efforts to produce radioisotopes.

“India has made significant strides in this direction and the task of developing Linear Accelerator (LINAC) technology has been undertaken by Sameer (Society of Applied Microwave Electronics and Engineering and Research) located in IIT Mumbai,” he said.

“It is a Rs 100-crore project being funded by the Telecommunications Ministry. Apart from India, Canada and Russia are the only other countries undertaking advanced level research in this area.”

According to him, in view of the importance of nuclear medicine in early detection of cancer and the recent emergence of new radionuclides for effective treatment, an effort is needed in India to provide these at an affordable cost.

Partnering with a foreign institute having nuclear facility for production of medically useful radioisotopes, and radiochemistry training are required urgently as we have no such course in the country as yet," he said.
The two dignitaries sharing a light moment. Wikimedia Commons.

“Developed countries like the US and Japan have about four PET (positron emission tomography) scanners per million population followed by Europe at 2, and Australia at 1.6 per million. India scores very low with 0.1 PET scanners per million population,” Singh said.

“To have a reasonable ratio of 1 PET scanner per million population over the next ten years, India needs about 1,400 PET scanners and an equal number of gamma cameras.”

Read also: Merkel Told Putin, US Complicated Middle East Situation

He suggested that through tie-ups with Russia, India could arrange to be supplied with such imaging equipment at affordable cost.

Singh’s wish list at this Black Sea resort includes a collaboration with Russia in human capacity building in this area.

“We urgently require international collaboration on radiopharmacy training, as there is no such facility in India.”

Partnering with a foreign institute having nuclear facility for production of medically useful radioisotopes, and radiochemistry training are required urgently as we have no such course in the country as yet,” he said.

“Panjab University, Chandigarh, has taken a lead in starting an M.Sc Nuclear Medicine programme in 2007, jointly with PGIMER.”

Singh is hoping that his agenda would figure in the summit between Prime Minister Narendra Modi and Russian President Vladimir Putin scheduled to take place here next week. IANS.

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