DNA directly photographed for the first time
2012 12 03

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 DNA’s structure indirectly. The double-corkscrew form was first discovered using a technique called X-ray crystallography, in which a material’s shape is reconstructed based on how X-rays bounce after they collide with it.


A bundle of DNA is supported by two silicon pillars.



DNA’s 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 Fabrizio’s 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 Fabrizio’s innovation will allow scientists to vividly observe interactions between DNA and some of life’s other essential ingredients, such as RNA (r ibonucleic acid ). The results of Di Fabrizio’s work were published in the journal NanoLetters.


Article from: msnbc.msn.com







Related Articles
’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 Animal’s 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 world’s knowledge in 4 grams of DNA”


Latest News from our Front Page

US Silent on Psychologists Role in CIA’s Tortures: Doctors
2014-12-20 21:53
Physicians for Human Rights had not received any response from the US Federal Commission to their call to investigate the role of health professionals in CIA’s torture program, Deputy Director of the organization told Sputnik. December 19 (Sputnik) — US government has not responded to calls to prosecute doctors, who participated in CIA torture program, the Deputy Director of Communications for ...
Ziolebrities: Simon Cowell donates £100,000 to Israeli soldiers to please pregnant jewish girlfriend Lauren Silverman
2014-12-20 21:00
Cowell, 54, is also planning a secret trip to Israel soon as he embraces the Jewish faith of Silverman, 36 Gala: Billionaire Haim Saban with Cowell Simon Cowell has publicly donated nearly £100,000 in support of the Israeli army. The X Factor boss pledged the cash to the Friends of the Israel Defense Forces at a US fund-raiser in Beverly Hills. The lavish gala ...
Former Chief Security Officer for NewsCorp: N. Koreans Not Behind Sony Hack, Interview Leak
2014-12-20 2:17
Hemanshu Nigam, a former federal prosecutor and former chief security officer for NewsCorp/Fox studios, says North Korea isn’t behind the Sony Hack. Nigam gave several bullet points for why the hack was likely an inside job. Attack code borrowed from a previous attack on Seoul, that’s why it’s in Korean. Private hackers typically borrow malicious code from other hackers.Nations state attacks follow ...
Sony Fires Back at Obama: Actually We Did Call the White House – Several Times
2014-12-20 2:13
Sony fired back at Obama after the press conference saying they had several conversations with the Obama White House before and after the movie was canceled. Via The Hollywood Reporter: After President Obama criticized Sony for its decision to cancel The Interview's release after theater chains decided not to show the film, the studio has issued a statement elaborating on the move. “The ...
The Bankster International
2014-12-20 1:55
Geopolitical analysis, the art of explaining power relationships through the prism of impersonal geography, can be a helpful tool for observers of the Great Game – but it also has its limitations. A case in point is the renewed US-Russia confrontation. Think tanks and policy insiders easily sell the narrative that from the dark days of the Cold War to ...
More News »