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Global Statistics

All countries
695,781,740
Confirmed
Updated on September 26, 2023 9:04 pm
All countries
627,110,498
Recovered
Updated on September 26, 2023 9:04 pm
All countries
6,919,573
Deaths
Updated on September 26, 2023 9:04 pm

Global Statistics

All countries
695,781,740
Confirmed
Updated on September 26, 2023 9:04 pm
All countries
627,110,498
Recovered
Updated on September 26, 2023 9:04 pm
All countries
6,919,573
Deaths
Updated on September 26, 2023 9:04 pm

An AI can inform whether ancient faeces originated from a person or a pet dog

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By Michael Le Page

archaeological dig

When archaeologists discover ancient faeces, understanding who left it is essential

Tim Wright/Getty Images

Pet dog faeces can still be frustrating thousands of years after being discarded.

Ancient faeces, or coprolites, can be a valuable source of info about the identity, diet plan and health of people who lived thousands of years ago.

So his group has actually established a technique of determining the source of ancient stools by sequencing the DNA maintained inside them. You may think that looking for human or pet DNA would be enough to expose the identity of the dumper, however it isn’t that basic.

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DNA clues

Dog faeces typically contain human DNA, thanks to their taste for tucking into the turds of other animals, including those of humans. On the flip side, ancient human faeces frequently contain pet DNA, due to the fact that eating dogs was long commonplace in lots of neighborhoods all over the world.

Because of this, Borry’s method looks at all the DNA in a coprolite, consisting of that of the microorganisms residing in the gut, which vary from types to species. His group trained a machine learning system called coproID using existing data on human and canine microbiomes.

The researchers inspected the system by testing contemporary stool samples, and after that applied it to 20 samples of soil or coprolites from historical sites where the source is known, or a minimum of believed.

The soil samples didn’t deceive the system and were classified as “unsure”. Another seven samples were clearly recognized as either dog or human. For example, faeces found in a chamberpot in the UK didn’t appear human based upon the parasites within. CoproID identified it as pet doodoo.

In another three samples, the DNA had degraded too much to be recognized. The source of the final 3 coprolites, from a website of human sacrifice in Mexico called the Cueva de los Muertos Chiquitos– the cavern of the dead kids– was likewise uncertain.

These three coprolites had a human-like microbiome but included even more pet dog DNA than human DNA. One explanation is that they were excreted by people who had just recently feasted on pet dogs.

” It is a great research study,” says Lisa-Marie Shillito of Newcastle University in the UK, whose team is establishing a different technique based on taking a look at lipid biomarkers, or fats. “But there are certain concerns that need to be resolved prior to the approach can be used commonly.”

Journal referral: PeerJ, DOI: 10.7717/ peerj.9001

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City of Cape Town urges people to leave Kataza the baboon alone

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