Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 59, Number 11
Friday–Saturday, October 17–18, 2014; Orem, Utah
Session L1: Plenary V |
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Chair: Joseph Jensen, Utah Valley University Room: Science Building 134 |
Saturday, October 18, 2014 3:05PM - 3:41PM |
L1.00001: Cosmic Dawn: Searching for the First Galaxies Invited Speaker: Richard Ellis A few hundred million years after the Big Bang, the first stars and galaxies formed. Astronomers refer to this event as ``Cosmic Dawn.'' Can powerful telescopes, probing back in cosmic history, directly witness this event? Large telescopes have already traced the history of galaxies back to when the Universe was 1 billion years old. The latest results from the Hubble Space Telescope give us our first glimpse of primitive stellar systems at even earlier times. Professor Ellis will address the progress and challenges of this fundamental quest for our origins, and discuss the future prospects with the next generation of giant 30-40 meter ground-based telescopes. [Preview Abstract] |
Saturday, October 18, 2014 3:41PM - 4:17PM |
L1.00002: X-ray lasers for structural biology Invited Speaker: John Spence Snapshot X-ray pictures from the world's first hard X-ray laser near Stanford (the LCLS) has provided time-resolved atomic-resolution images of the molecular machine in plants which splits water to create the oxygen we breathe, while digesting CO2, important for global warming. I'll describe the single-file synchronized submicron droplet beam we use to run molecules across the pulsed laser, and how we image protein molecules important in disease (GPCRs, membrane proteins, 2D crystals, an enzyme drug target for sleeping sickness). We use femtosecond pulses to outrun radiation damage, and unscramble orientational disorder from randomly oriented molecules in solution without modeling, using angular correlation functions. I'll also describe how this coherent radiation provides new solutions to the phase problem for nanocrystals. An overview will also be provided of the NSF's new Science and Technology Center for the application of X-ray lasers to structural biology, a seven-campus consortium which started in 2013. [Preview Abstract] |
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