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DTSTART;TZID=America/Chicago:20190906T153000
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DTSTAMP:20190913T181115Z
CREATED:20190827T143041Z
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SUMMARY:Physics Colloquium - Andrew Baker
DESCRIPTION:Andrew Baker\, Rutgers University \nDusty Star-Forming Galaxies at High Redshift\nInterstellar dust grains can collectively scatter\, redden\, and attenuate the light from a galaxy’s stars– in some cases\, so effectively that a galaxy can become nearly undetectable at rest-frame ultraviolet and optical wavelengths.  Starting in the late 1990s\, astronomers have come to understand that luminous but optically obscured systems are much more prevalent at high redshifts (i.e.\, earlier times) than in the local universe\, and that they make important contributions to the overall history of cosmic star formation.  Progress in understanding the demographics and internal properties of these “dusty star-forming galaxies” (DSFGs) has been impeded by their high obscuration\, but radio telescopes are capable of seeing through the dust and probing the reservoirs of cold interstellar gas that power DSFGs’ star formation.   \nI will discuss recent observational results on the redshift distributions\, evolutionary states\, and detailed internal properties of DSFGs\, along with what we can learn from gravitationally lensed DSFGs about intervening mass distributions along the line of sight. \nEvent flyer available here
URL:https://uwm.edu/physics/event/bakerrutgers09062019/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20190920T153000
DTEND;TZID=America/Chicago:20190920T163000
DTSTAMP:20190909T142251Z
CREATED:20190827T143041Z
LAST-MODIFIED:20190909T142251Z
UID:10381464-1568993400-1568997000@uwm.edu
SUMMARY:Physics Colloquium - Mark C. Williams
DESCRIPTION:Mark C. Williams\, Northeastern University \nHow Proteins Use Thermodynamics to Fight Over DNA \nOptical tweezers allow us to probe the interactions of proteins with single DNA molecules and apply very small forces.  Measurement of force-dependent DNA conformations allows us to quantify interactions that govern cellular function.  DNA forms a stable double-helix in order to store the genetic information for most organisms.  However\, in the process of replicating an organism’s genome\, the two strands of the helix must be separated to form single-stranded DNA (ssDNA).  This intermediate state is vulnerable to interference from many cellular processes and is therefore tightly regulated.  \nI will discuss how the protein SSB from the model bacterium E. coli uses a complex and dynamic wrapping mechanism to control access to ssDNA during normal replication.  I will then describe a protein in human cells (APOBEC3G) that occupies and/or modifies ssDNA that is formed during retroviral replication\, helping to confer immunity to HIV under some conditions.  APOBEC3G uses multiple biophysical and biochemical mechanisms to inhibit viral replication and induce viral mutations\, which we dissect using single molecule methods.  The results demonstrate complex biophysical mechanisms that regulate ssDNA access across a range of organisms and cell types. \nEvent flyer available here
URL:https://uwm.edu/physics/event/physics-colloquium-to-be-announced-2019-09-20/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20190927T153000
DTEND;TZID=America/Chicago:20190927T163000
DTSTAMP:20190923T180729Z
CREATED:20190827T143041Z
LAST-MODIFIED:20190923T180729Z
UID:10382469-1569598200-1569601800@uwm.edu
SUMMARY:No Physics Colloquium This Week
DESCRIPTION:No colloquium this week – Dr. Narae Kang has been rescheduled for 4 October 2019.
URL:https://uwm.edu/physics/event/physics-colloquium-to-be-announced-2019-09-13-2019-10-04/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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