Category Archives: DNA

Day 4 Video 5 - Lactose Intolerance, Nucleic Acids, DNA, RNA, ATCG, Base Pairs
Lactose Intolerance, Nucleic Acids, DNA, RNA, ATCG, Base Pairs,

By: Amy B Hollingsworth

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Day 4 Video 5 - Lactose Intolerance, Nucleic Acids, DNA, RNA, ATCG, Base Pairs - Video

Jack the Rippers Identity Revealed, Thanks to DNA Analysis
Jack the Ripper #39;s Identity Revealed, Thanks to DNA Analysis.

By: PYUTV

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Jack the Rippers Identity Revealed, Thanks to DNA Analysis - Video

Dr Ali Muhammad: "Non DNA Diet" Destroys Nitrogen (Aboriginal Summit 2014 Day2) [Health Day]
Dr Ali Muhammad elaborates on his "Non DNA Diet"" at the Aboriginal Summit 2014. There is also a Q A with George Bess and Ali Muhammad at the end.

By: Ready4 R

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Dr Ali Muhammad: "Non DNA Diet" Destroys Nitrogen (Aboriginal Summit 2014 Day2) [Health Day] - Video

Bateria Neuropsicolgica Luria DNA
Bateria Neuropsicolgica Luria DNA.

By: El divn de Joos

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Bateria Neuropsicolgica Luria DNA - Video

Tmnt mep -DNA Part 6
Sorry das es ein Video aus Bilder ist ich arbeite daran auch bewegelich Video machen zu knnen habe aber bis jetzt noch keine Mglichkeit fr Handy gefunden ,hoffe der Part gefllt dir.

By: Selina Simmerlein

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Tmnt mep -DNA Part 6 - Video

DNA is one of the nucleic acids, information-containing molecules in the cell (ribonucleic acid, or RNA, is the other nucleic acid). DNA is found in the nucleus of every human cell. (See the sidebar at the bottom of the page for more about RNA and different types of cells). The information in DNA:

The key to all of these functions is found in the molecular structure of DNA, as described by Watson and Crick.

Although it may look complicated, the DNA in a cell is really just a pattern made up of four different parts called nucleotides. Imagine a set of blocks that has only four shapes, or an alphabet that has only four letters. DNA is a long string of these blocks or letters. Each nucleotide consists of a sugar (deoxyribose) bound on one side to a phosphate group and bound on the other side to a nitrogenous base.

There are two classes of nitrogen bases called purines (double-ringed structures) and pyrimidines (single-ringed structures). The four bases in DNA's alphabet are:

Watson and Crick discovered that DNA had two sides, or strands, and that these strands were twisted together like a twisted ladder -- the double helix. The sides of the ladder comprise the sugar-phosphate portions of adjacent nucleotides bonded together. The phosphate of one nucleotide is covalently bound (a bond in which one or more pairs of electrons are shared by two atoms) to the sugar of the next nucleotide. The hydrogen bonds between phosphates cause the DNA strand to twist. The nitrogenous bases point inward on the ladder and form pairs with bases on the other side, like rungs. Each base pair is formed from two complementary nucleotides (purine with pyrimidine) bound together by hydrogen bonds. The base pairs in DNA are adenine with thymine and cytosine with guanine.

In the next section we'll find out how long DNA strands fit inside a tiny cell.

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DNA Structure - HowStuffWorks "Science"

A self-described "armchair detective" and a Finnish molecular biologist have claimed to have discovered the identity of the serial killer known as Jack the Ripper, who brutally murdered at least five prostitutes in the East End of London in the autumn of 1888.

A report in the Mail on Sunday names the killer as Aaron Kosminski, a Jewish Polish-born immigrant who lived in the East End and would have been 23 years old at the time of the murders. He had arrived in England in 1881 with his family, who were fleeing persecution by Russian authorities. He was later committed to an insane asylum, where he died of complications from gangrene.

Molecular biologist Dr. Jari Louhelainen tells the Mail on Sunday that he used a technique called "vacuuming" to remove DNA from a stained shawl purportedly belonging to one of the victims, Catherine Eddowes. Businessman Russell Edwards had bought the shawl at an auction in 2007, and had asked Louhelainen to help him find any clues that may be connected with the Ripper case.

The scientist said that infrared imaging revealed that the stains on the shawl were blood stains and were consistent with arterial blood splatter caused by slashing. Louhelainen claimed that the DNA from the blood stains found on the shawl was a match for Eddowes.

Other stains found on the shawl were florescent and had the characteristics of semen. Louhelainen said that a second set of DNA tests were carried out on the stains after cells from the epithelium -- a tissue that lines cavities and organs -- were discovered in the stains. Two strands of DNA were tested against a descendent of Kosminski's sister. The first was a 99.2 percent match, while the other strand was a perfect match. Louhelainen wrote that the DNA extracted from the shawl enabled him to specify Eddowes's killer as being of Russian Jewish ancestry with dark hair.

"Im excited and proud of what weve achieved," Louhelainen told the Mail, "and satisfied that we have established, as far as we possibly can, that Aaron Kosminski is the culprit."

However, scientists and scholars of the Ripper case have already cast doubt on Edwards and Louhelainen's specific claims, alleging that the evidence on the shawl is so compromised that any positive identification may be impossible.

"The shawl has been openly handled by loads of people and been touched, breathed on, spat upon," Richard Cobb, who runs Jack the Ripper conventions and tours, told The Times of London. "My DNA is probably on there. Whats more, Kosminski is likely to have frequented prostitutes in the East End of London. If I examined that shawl, Id probably find links to 150 other men from the area."

Sir Alec Jeffreys, who invented the technique of DNA fingerprinting, called the new research "An interesting but remarkable claim that needs to be subjected to peer review, with detailed analysis of the provenance of the shawl and the nature of the claimed DNA match with the perpetrator's descendants and its power of discrimination; no actual evidence has yet been provided."

However, Jeffreys also said that the lack of convincing evidence at a distance of 125 years does not rule out Kosminski as the prime suspect. "If I remember correctly when I visited the Black Museum at New Scotland Yard," Jeffreys told the Independent, "Kosminski was long regarded as by far the most likely perpetrator."

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DNA Identifies Jack the Ripper

LONDON - An amateur detective claims to have used pioneering DNA technology to prove serial murderer Jack the Ripper was a Polish immigrant. The killer's identity is still a mystery some 126 years after he murdered at least five women and left their mutilated bodies in alleyways across East London. But author and amateur sleuth Russell Edwards says he used DNA from a scarf found near one of the murder scenes to unmask the Ripper as Aaron Kosminski. "I am a hundred percent certain," he told NBC News' U.K. partner ITV News. "Definitive proof, conclusively proven, put the case to bed - we've done this." His theory is detailed in his book "Naming Jack the Ripper," published Tuesday

A shawl that was taken from the murder scene of Jack the Ripper's fourth victim Catherine Eddowes on September 30, 1888. Jack the Ripper, one of the most notorious serial killers in history, has been identified as Aaron Kosminski through DNA traces found on the shawl, claims a sleuth in a book to be published Tuesday.

Edwards worked with Finnish molecular biologist Jari Louhelainen to analyse DNA on a scarf found near the body of Ripper victim Catherine Eddowes. But not everyone is convinced: Richard Cobb, who runs Jack the Ripper tours, told the Times of London that the shawl has been openly handled by loads of people and been touched, breathed on, spat upon," therefore contaminating the evidence.

First published September 8 2014, 5:02 AM

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Has New DNA Evidence Finally Unmasked Jack the Ripper?

Polar Bear Footprints DNA Samples Processing
You can help save polar bears: http://bit.ly/Z5ngAG Gert Polet and Geoff York of WWF demonstrate the processing of the samples collected from polar bear footprints. For the first time, scientists...

By: WWF International

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Polar Bear Footprints DNA Samples Processing - Video

DNA: ISIS planning 9/11 style terror plot against America?
With the anniversary of the September 11th attacks right around the corner, Intelligence reports suspect that ISIS may plan 9/11-style terror plot against Am...

By: Zee News

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DNA: ISIS planning 9/11 style terror plot against America? - Video