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Physics and Astronomy
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Written by xScience.Info
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Wednesday, 13 December 2006 |
 A new analytical technique that uses infrared spectroscopy to study
light-sensitive organic materials could lead to the development of
cheaper, more efficient solar cells. Using infrared (IR) spectroscopy
to study the vibrations of atoms within the material, the technique
provides information about the movement of electrons within a film of
carbon-based materials. Obtaining this information is a critical step
in the development of a new class of solar cells, which promise
significant savings in production costs compared to conventional
silicon-based cells. The new analytical technique, published as the
cover story in this week's issue of the Journal of Physical Chemistry B, was developed by a team led by Penn State University researcher John B. Asbury, assistant professor of chemistry.
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Life Sciences
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Written by xScience.Info
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Tuesday, 12 December 2006 |
 An organelle called the nucleolus resides deep within the cell nucleus
and performs one of the cell's most critical functions: it manufactures
ribosomes, the molecular machines that convert the genetic information
carried by messenger RNA into proteins that do the work of life.
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Physics and Astronomy
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Written by xScience.Info
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Tuesday, 05 December 2006 |
Dark energy, the unidentified force
that's pushing the universe to expand at ever faster rates, was
already at work as early as nine billion years ago, scientists
reported last week. New Hubble Space Telescope sightings of distant
supernova explosions support the explanation of dark energy as
energy of the vacuum whose density has stayed constant throughout
the universe's history, the scientists said.
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Physics and Astronomy
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Written by xScience.Info
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Tuesday, 05 December 2006 |
A team of Italian and German physicists has
developed a new, flexible fabrication technique for rewritable
photonic crystal devices, which could make it easier to create and
modify circuits in which photons process information in the same way
that electric currents do in electronics.
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Experimental Methods and Techiques
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Written by xScience.Info
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Tuesday, 05 December 2006 |
The brain and heart both
generate weak magnetic fields which, in ways different from electric
fields, can reveal subtle clues about such maladies as epilepsy and
arrhythmias. Sensitive magnetometers, based on superconducting
quantum interference devices (SQUIDs), have been used to prepare
detailed magnetoencephalograms (MEGs). Unfortunately, these devices
require liquid helium and all its associated cryogenic equipment.
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