Google Tech Talks April 9, 2007 ABSTRACT While investigating the genetic workings of the microscopic worm, C. elegans, Mello and colleague Andrew Fire, PhD, of the Carnegie Institution of Washington, discovered RNAi, a natural but previously unrecognized process by which a certain form of RNA can be manipulated to silence—or interfere with—the expression of a selected gene. The discovery, published in the journal Nature in 1998, has had two extraordinary impacts on biological science. One is as a research tool: RNAi is now the state-of-the-art method by which scientists can knock out the expression of specific genes in cells, to thus define the biological functions of those genes. But just as…

Scientists at Virginia Commonwealth University have revealed in the journal Nature Chemistry that they’ve created a “magnetic superatom”, or “a stable cluster of atoms that can mimic different elements of the periodic table”. The poor Periodic Table of the Elements barely gets any respect as it is from the kids today (quick: do you know your Noble Gases, or the atomic weight of Nobilium?), now it has to compete with fancypants super atoms!

This new superatom is made of one vanadium and eight cesium atoms, and it “acts like a tiny magnet that can mimic a single manganese atom in magnetic strength while preferentially allowing electrons of specific spin orientation to flow through the surrounding shell of cesium atoms”. What good is this new superatom? According to Shiv N. Khanna, Ph.D., professor in the VCU Department of Physics:

A combination such as the one we have created here can lead to significant developments in the area of “molecular electronics,” a field where researchers study electric currents through small molecules. These molecular devices are expected to help make non-volatile data storage, denser integrated devices, higher data processing and other benefits.

The researchers are also exploring non-conductive magnetic superatoms by combining gold and manganese.

Via Spintronics Info.

Last month, GE revealed that its research scientists had discovered a way, using holographic technology, to store 100 DVDs worth of information on a single standard DVD. What a difference a few weeks make.

In what can only be seen as a “serving” (or pwning) of the GE researchers, the B-Boys researchers at the Swinburne University of Technology in Melbourne, Australia, have gone way past 100 and on to 2,000.

While standard DVDs are made with three spatial dimensions, the Aussie researchers added two more.

Using nanoparticles–extremely small bits of matter–the Swinburne team was able to introduce a spectral (or color) dimension and a polarization dimension.

To create the “color dimension,” the researchers inserted gold nanorods onto a disc’s surface. Because nanoparticles react to light according to their shape, this allowed the researchers to record information in a range of different color wavelengths on the same physical disc location. Their findings appear in the current issue of the scientific journal Nature.

Current DVDs are recorded in a single color wavelength using a laser. Brain explode yet? No? Well just keep reading, pal.

…