Daily Archives: February 25, 2014

Plaque On 1000-Year-Old Human Teeth Could Unlock Secrets Of Medieval Diet And Disease

Posted: February 25, 2014 at 8:45 pm

Details Published on Tuesday, 25 February 2014 16:53

Hardened plaque discovered on the teeth of 1,000 year old human skeletons has revealed not only their diets but the diseases they faced.HARDENED plaque discovered on the teeth of 1,000-year-old human skeletons has revealed the world's oldest case of gum disease.

Described as a 'microbial Pompeii', the plaque preserved bacteria and microscopic particles of food on the surfaces of teeth, effectively creating a mineral tomb for microbiomes.

And it revealed that our ancestors had gum disease that was caused by the same bacteria that plagues modern man, despite major changes in diet and hygiene.

They found that the ancient human oral microbiome already contained the basic genetic machinery for antibiotic resistance over eight centuries before the invention of antibiotics in the 1940s.

DNA testing of the tartar also showed some of the things ancient humans had been eating, such a vegetables, which do not show up in fossil records.

Gum disease is caused by a build-up of plaque on the teeth and is thought to affect over half of adults in the UK.

The teeth were taken from skeletons found at a site in Dalheim, Germany.Plaque is a sticky substance that contains bacteria and when it hardens it forms tartar.

Unlike bone, which rapidly loses much of its molecular information when buried, calculus grows slowly in the mouth and enters the soil in a much more stable state, helping it to preserve biomolecules.

Researchers from the University of York, along with Swiss and Danish colleagues, said studying plaque will be more important than teeth in discovering the lifestyles of our past ancestors.

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Plaque On 1000-Year-Old Human Teeth Could Unlock Secrets Of Medieval Diet And Disease

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Fingrarna och DNA – 112 Aina – Video

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Fingrarna och DNA - 112 Aina
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Pdair Leather Case For Htc Droid Dna Adr6435 Verizon) Vertical Pouch Type 669 – Video

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Pdair Leather Case For Htc Droid Dna Adr6435 Verizon) Vertical Pouch Type 669

By: Erminia Chhabra

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Pdair Leather Case For Htc Droid Dna Adr6435 Verizon) Vertical Pouch Type 669 - Video

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Pdair Leather Case For Htc Droid Dna Adr6435 Verizon) Horizontal Pouch Type 668 – Video

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By: Erminia Chhabra

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Extracting DNA – Video

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Extracting DNA

By: Luke Strohmeyer

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Extracting DNA - Video

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Droid Dna Camera Sample 898 – Video

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Droid Dna Camera Sample 898

By: Elene Waldmann

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140225 Lec5a DNA ProteinInteractionsIntro – Video

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140225 Lec5a DNA ProteinInteractionsIntro

By: Phillip Musich

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DNA MS21380942A; Mammoth Spoke Wheel 21inch X 3inch Front – Video

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DNA MS21380942A; Mammoth Spoke Wheel 21inch X 3inch Front
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Htc Droid Dna – The Ultimate Smartphone 913 – Video

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Htc Droid Dna - The Ultimate Smartphone 913

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Htc Droid Dna - The Ultimate Smartphone 913 - Video

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DNA tests solve 23-year-old Fla. murder case

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Authorities in Florida say they have solved the 23-year-old mystery of a woman's strangulation death in Broward County and linked the crime to a convicted killer who was executed in 2011 for a triple murder.

DNA evidence identified Oba Chandler as the suspect in the murder of Ivelisse Berrios-Beguerisse, who was found dead in a quiet Coral Springs neighborhood on Nov. 27, 1990, police said Monday.

Dan Cucchi, a cold case detective with the Coral Springs Police Department, told the Sun-Sentinel that the original investigators on the case had gathered and processed DNA samples without much success because the technology was less sophisticated and a database with criminals' DNA did not exist at the time.

"Mr. Chandler, when he was convicted in 1994, that's when his DNA profile would have been entered into the national database, so it was in there in that time period," Cucchi told the newspaper. "It's just that we didn't have a profile from our victim's rape kit at that time."

Chandler was convicted in the rape, strangulation and killing of a St. Petersburg woman and her two daughters. He was executed by lethal injection in 2011 at the age of 65, the Sun-Sentinel reported.

Berrios-Beguerisse was last seen leaving work at the Sawgrass Mills mall. Her husband went to the mall and called police after finding her 1985 Ford Tempo with two slashed tires, the report said.

Her body was found three hours later with ligature marks on both wrists and ankles and brown packing tape stuck in her hair, Cucchi said.

"Back in 1990, rape kits and the DNA collection process were not the same but now it's way more advanced," Cucchi told the newspaper. "You can actually take a smaller sample and through the new technology they can develop potential profiles and suspect DNA, where in the past they could not."

Cucchi andfellow detective Brian Koenig were assigned the cold case last August and asked the Broward Sheriff's Office Crime Lab to perform tests on the DNA samples again.

If Chandler were still alive, he would be charged with the strangulation death of Berrios-Beguerisse, police told the Sun-Sentinel.

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DNA tests solve 23-year-old Fla. murder case

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