SLAC Today is
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In this issue:
SLAC was Indispensable, says Nobel Prize Winner
Science Today: Subnuclear Scaling, Simplicity, and Supersymmetry
Stanford E-mail Server Change
Almanac Features SLAC Research
Thursday - October 5, 2006 |
SLAC was Indispensable, says Nobel Prize WinnerUpon receiving the Nobel Prize for Chemistry yesterday, Stanford Professor Roger Kornberg praised SLAC and the Stanford Synchrotron Radiation Laboratory facility. "We could not have solved the problem that was noted in the Nobel Prize announcement without the exceptional facilities given to us by SLAC. They were indispensable," Kornberg said. Kornberg received the award for determining how DNA's genetic blueprint is read and subsequently used to direct the process for protein manufacture. Since the early 1990s, Kornberg has studied this transcription process at SSRL's Beamline 9-2 and 11-1. By passing the lab's extremely bright x-rays through crystallized proteins and watching how the x-rays scattered, Kornberg revealed the three-dimensional atomic structure of proteins in high resolution. The high level of detail in these images offered the first real understanding of the defining events of transcription. "Congratulations to Dr. Roger Kornberg for his outstanding research," said Under Secretary for Science Raymond L. Orbach. "I am pleased and proud that the experimental work that led to Dr. Kornberg's Nobel Prize award took place at two Department of Energy funded synchrotron radiation laboratories. I congratulate all the staff at these two world-class laboratories on their high quality work." Read SLAC's press release... |
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Subnuclear Scaling, Simplicity and SupersymmetryImagine a world which looks exactly the same at every scale, no matter how much you magnify it. A simple representation of this kind of world is a fractal, like the Koch snowflake, which looks the same when magnified by any power of three. The world of atomsas well as nuclei, protons and neutronshas a definite size, so it doesn't behave like this. But at distances much smaller than the radius of the proton, quarks and gluons behave almost this way. In the theory of QCD (Quantum Chromodynamics), the interactions of quarks and gluons become weak at short distances. This property is known as asymptotic freedom. The interactions get weak quite slowly, however, so QCD is almost independent of scale. The quasi-freedom of the quarks explained the dramatic "scaling" results of electron-proton scattering experiments performed at SLAC in the 1960s. But the scaling is not perfect, because residual interactions of the quarks cause them to change how they are distributed in the proton, as you look closer. The length of the curve around the Koch snowflake is an example of this phenomenonwhen you look three times closer, the length increases by a factor of 4/3, because you see a new triangle where there was once a straight line. Read more... |
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