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Science and Society
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Written by xScience.Info
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Friday, 24 November 2006 |
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 A look at the inside of cells becomes sharper: Both figures above show the filaments |
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Life Sciences
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Written by xScience.Info
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Tuesday, 07 November 2006 |
 Psychotic symptoms such as hallucinations, delusions, personality
changes, and disorganized thinking occur in several psychiatric
disorders, including schizophrenia, bipolar disorder, and psychotic
depression. Scientists understand little of what goes wrong in a
psychotic person's brain, but hope that brain imaging and systematic
characterization of genetic activity and protein composition in the
brain might help to shed light on mental diseases, eventually leading
to better diagnosis, treatment, and possibly even prevention. A new
study by Sabine Bahn and colleagues (Cambridge University) published in
the international open-access journal PLoS Medicine provides a step in
that direction.
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Experimental Methods and Techiques
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Written by xScience.Info
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Monday, 30 October 2006 |
The waves are the fastest matter waves ever photographed,
clocking in at about 99.997% of the speed of light, close to 1 billion
miles per hour! But their speed is not their only interesting feature.
These waves, known as wakefields because they are generated in
the wake of an ultra-intense laser pulse, are traveling oscillations in
a sea of electrons known as a plasma, and give rise to enormous
electric fields, reaching voltages higher than 100 gigaelectron
volts/meter (GeV/m). To understand how strong this is, consider a test
electron experiencing one of these electric fields. The electron
“surfs” on the electric-field that accompanies the plasma wave, and
accelerates almost instantaneously to near-light-speed at a rate of
about 2 x 1022 m/s2, which is like going from 0 to 60 mph in one
zeptosecond. For those not in the know, that’s a billionth of a
trillionth of a second, or 1/1,000,000,000,000,000,000,000 of a second!
At this rate of acceleration, the electron would outrun any ordinary
matter-wave, but the light-speed wakefields keep up, accelerating the
electron to relativistic energies.
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Life Sciences
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Written by xScience.Info
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Monday, 23 October 2006 |
 A Princeton-led research group has discovered an isolated community of
bacteria nearly two miles underground that derives all of its energy
from the decay of radioactive rocks rather than from sunlight.
According to members of the team, the finding suggests life might exist
in similarly extreme conditions even on other worlds.
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Physics and Astronomy
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Written by xScience.Info
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Wednesday, 18 October 2006 |
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 The Athena collaboration, an
experimental group working at the CERN laboratory in Geneva, has measured
chemical reactions involving antiprotonic hydrogen, a bound object
consisting of a negatively charged antiproton paired with a
positively charged proton.
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