Events at Physics

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Events During the Week of June 24th through July 1st, 2012

Monday, June 25th, 2012

No events scheduled

Tuesday, June 26th, 2012

CMSO Teleconference Seminar
Guide Field Effects on Hall Reconnection in MRX
Time: 11:00 am - 12:00 pm
Place: Chamberlin 4274
Speaker: Tim Tharp, Princeton Plasma Physics Lab
Host: Mark Nornberg
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Wednesday, June 27th, 2012

No events scheduled

Thursday, June 28th, 2012

No events scheduled

Friday, June 29th, 2012

R. G. Herb Condensed Matter Seminar
Direct Observation of Base-Pair Stepping and Conformational Dynamics in Molecular Nanomachines
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Yann Chemla, University of Illinois
Abstract: Optical traps or "tweezers", which utilize focused light to trap and manipulate microscopic objects, have emerged as a powerful tool in molecular biology, biochemistry and biophysics. My group uses this technique to tackle a variety of biological questions, in particular how proteins involved in genome processing interact and move along DNA. In this talk, I will focus on recent work on helicases, the molecular machines that catalyze the separation of the two strands of DNA. Specifically, I will discuss new results on two helicases involved in DNA repair, Xeroderma pigmentosum group D protein (XPD) and E. coli UvrD helicase.

Using single-molecule assays developed in my lab combining microfluidics, high-resolution optical tweezers, and simultaneous fluorescence microscopy, we obtain an unprecedented detailed view of helicase motor dynamics at the sub-nanometer scale. These techniques allow us to record single base pair-scale helicase activity simultaneously with stoichiometry and conformation, and help us decipher the mechanism by which helicases unwind DNA. Our data reveal how these nanomachines sense the DNA sequence they must unwind and how their conformational state modulates their activity. I will discuss the biological implications of our findings.
Host: McDermott
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Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Le Zhang (
Host: Peter Timbie
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