DNA directly photographed for the first time
By Eli MacKinnon | NBCNews
Fifty-nine years after James Watson and Francis Crick deduced the double-helix structure of DNA, a scientist has captured the first direct photograph of the twisted ladder that props up life.
Enzo Di Fabrizio, a physics professor at Magna Graecia University in Catanzaro, Italy, snapped the picture using an electron microscope.
Previously, scientists had only seen DNAs structure indirectly. The double-corkscrew form was first discovered using a technique called X-ray crystallography, in which a materials shape is reconstructed based on how X-rays bounce after they collide with it.
A bundle of DNA is supported by two silicon pillars.
DNAs double-helix structure is on display for the first time in this electron microscope photograph of a small bundle of DNA strands.
But Di Fabrizio and his colleagues developed a plan to bring DNA out of hiding. They built a nanoscopic landscape of extremely water-repellant silicon pillars. When they added a solution that contained strands of DNA into this scene, the water quickly evaporated and left behind cords of bare DNA that stretched like tightropes between the tiny mesas.
They then shone beams of electrons through holes in the silicon bed, and captured high-resolution images of the illuminated molecules.
Di Fabrizios images actually show a thread of several interwoven DNA molecules, as opposed to just two coupled strands. This is because the energy of the electrons used would be enough to destroy an isolated double helix, or a single strand from a double helix.
But with the use of more sensitive equipment and lower energy electrons, Di Fabrizio thinks that snapshots of individual double helices will soon be possible, New Scientist reports.
Molecules of DNA, or deoxyribonucleic acid, store the genetic instructions that govern all living organisms growth and function.
Di Fabrizios innovation will allow scientists to vividly observe interactions between DNA and some of lifes other essential ingredients, such as RNA (r ibonucleic acid ). The results of Di Fabrizios work were published in the journal NanoLetters.
Article from: msnbc.msn.com
Odd Little Creature Skips Sex and Eats DNA
The US Is Collecting the DNA of World Leaders
Bigfoot DNA: The Proof is Out There?
Asexual, All-Female Animals Survival Trick: DNA Hijacking
DNA of Hungarian mummies may help combat tuberculosis
Life on Mars? Scientists hope to find it by decoding Martian DNA - We Can Rebuild Them
We could put the whole worlds knowledge in 4 grams of DNA
Latest News from our Front Page
Professor: Reason Itself Is A White Male Construct
A philosophy and religion professor at Syracuse University gave an interview to The New York Times Thursday in which he critiqued the notion of pure reason as simply being a “white male Euro-Christian construction.”
Prof. John Caputo was being interviewed by fellow philosophy professor George Yancy for the 13th installment of an interview series Yancy conducts with philosophers regarding racial topics.
Given its emphasis on first principles ...
The Broken Window Fallacy
Youtube description: This short video explains one of the most persistent economic fallacies of our day.
Jenji Kohan and the Jewish Hyper-Sexualization of Western Culture
As detailed in The Culture of Critique, Freud and his followers regarded anti-Semitism was a universal pathology which had its roots in sexual repression. The theoretical basis for this can be found in Freud’s Three Essays on the Theory of Sexuality where he linked aggression to the frustration of human drives — especially the sex drive. Kevin MacDonald notes that: ...
Confederate History - Dispelling the Myths
History books, the media, the school systems, etc abound in falsehoods and inaccuracies of Confederate and Southern history. This fact sheet will help to clarify and dispell some of these rampant inaccuracies.
MYTH - The War of 1861 - 1865 was fought over slavery.
FACT - Terribly untrue. The North fought the war over money. Plain ...
Gays Rights May Open Door for Pedophile Rights
Democrats have attempted to normalize pedophilia as a sexual orientation.
A recent Supreme Court ruling on same-sex marriage may soon allow pedophiles to argue they are suffering discrimination.
âUsing the same tactics used by âgayâ rights activists, pedophiles have begun to seek similar status arguing their desire for children is a sexual orientation no different than heterosexual or homosexuals,â writes Jack Minor ...
|More News » |