Category: Chemistry (page 2 of 15)

buckyballs from outer space

 

Buckyball

Buckminsterfullerene, also known as C60 and buckyballs, are believed to cause interstellar absorption patterns that have confounded scientists for decades.

For at least 100 years scientists have been observing unknown absorption bands in outer space. These diffuse interstellar bands were of unknown origin, until just recently.

Astronomers have believed buckyballs, or fullerene to be behind the phenomena since the mid-90s. Fullerenes are molecular carbon, made of 60 carbon atoms and shaped like soccer balls or geodesic domes. The wavelengths of light that buckyballs absorbed when encased in an unreactive frozen solids were similar to the patterns observed in space. But, since they were unable to observe the molecules under space-like conditions, it was not possible to claim that they were the definite cause. Over the next 20 years, researchers have worked on observing C60 in space-like conditions. Now, John Maier has observed behavior of fullerene ions at close to absolute zero and under high vacuum.  They found spectral lines at wavelengths of 9577 and 9632 angstroms, which match the patterns seen in space. This result offers considerable evidence that the molecules are behind the bands. The research is published at Nature.

 

the chemistry of wine

Have you ever wondered what makes wine so good? Scientifically speaking, of course.  The team at Reactions explains the science behind the flavor profiles of different vintages.

2014 nobel prizes

Nobel_medal

The Nobel prizes were awarded this week. Each year there are three science related awards in the fields of medicine, physics and chemistry.

In the field of medicine, the award went to John O´Keefe, May-Britt Moser and Edvard I. Moser for discovering the brain cells that make up our positioning system. In 1971 John O’Keefe discovered that when a rat was in a certain part of the room, one part of the hippocampus was always activated. When the rat was in other parts of a room there were different cells activated. He termed these cells “place cells” and determined that they formed a map. In 2005, the Mosers discovered what they called “grid cells”. These cells generated a coordinate system and aid in finding our way along paths. Read more about the physiology and medicine prize here.

This years physics medal went to the invention of LEDs and was awarded to Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura. The three researchers contributed to the development of LED technology, which is prevalent in today’s telephones, lamps, and computers. LED lights emit brighter light than incandescent lights and for longer periods of time. Read more about the award at Scientific American. The press release is here.

The chemistry prize was awarded to Eric Betzig, Stefan Hell, and William Moerner for developing super resolved fluorescence microscopy. Researchers thought they were limited by the limit of diffraction when it came to resolving images under a microscope. The three Nobel recipients have developed technology that helped overcome this limitation and resolve images into the nanometer scale. Stefan Hell developed a technique called stimulated emission depletion microscopy or STED. Bezig and Moerner, working separately, performed the groundwork for the development of single molecule microscopy. You can read the press release here, and a more detailed description of high resolution microscopy here.

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