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
’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
Nigel Farage (UKIP) Speech on the EU, UK & Mass Immigration
2014 03 08
UKIP Nigel Farage Spring Conference speech - 2014
Red Ice Radio:
Nigel Farage MEP - The State of the EU & The Undemocratic Treaty of Lisbon
Labour wins UK by-election as Ukip trumps Tories
The ruling coalition in the UK was dealt a blow in the latest by-election test, as the UK Independence party pushed the Conservatives and Liberal Democrats into third and fourth ...
Pentagon studying Putin’s body language to predict his behavior
2014 03 07
The Pentagon has spent hundreds of thousands of dollars in recent years so that researchers can study the body movements of foreign leaders, including Russian President Vladimir Putin, in hopes of predicting future behavior.
An article published by USA Today reporter Ray Locker on Thursday and corroborated by documents discovered by RT provides rare insight into a scarcely-discussed military effort that ...
Pentagon Claims That Climate Change ‘Enables Terrorism’
2014 03 07
In it’s latest Quadrennial Defense Review the Pentagon has said that climate change and ’erratic’ climate will cause increased terrorist activity.
The four yearly reports highlight threats that face civilization and this years homed in on climate change causing an increase in terrorism.
It also mentioned that rises in sea levels and other issues associated with a warming planet will lead ...
Scientists Control Tiny Mechanical Probes Inside Human Cells
2014 03 07
Nanotechnology doesn’t get as much attention these days as genetic and stem cell approaches to medicine, but all three aim to target the causes of illness with greater precision and less collateral damage in the rest of the body than conventional approaches.
Nanotech breakthroughs have come more slowly than many had hoped, but a recent success shows progress toward the goal ...
Fukushima: The Ticking Nuclear Bomb. Over 800 Tons of Radioactive Material Pouring into Pacific Ocean
2014 03 07
First published by GR in October 2013
In August this column ran a piece claiming that the Pacific Ocean was being poisoned by radioactive material escaping from Fukushima, two years after the devastating tsunami and meltdown at the Japanese nuclear facility. Three months later, shocking evidence points towards a calamity situation.
Silence from the corporate media.
There is growing evidence coming from ...
|More News » |