Past Events

  • Evolution Cluster Faculty Search Seminar: "Adaptive modeling of dynamic periodicity and trend with heteroscedastic and dependent errors---with clinical applications"

    Lynch Lecture Hall (Chemistry)

    Hau-Tieng Wu, Stanford University

    Periodicity and trend are features describing an observed sequence, and extracting these features is an important issue in many scientific fields. However, it is not an easy task for existing methods to analyze simultaneously the dynamic periodicity and trend, and the adaptivity of the analysis to such dynamics and robustness to heteroscedastic, dependent errors are not guaranteed. These tasks become even more challenging when there exist multiple periodic components.

  • Evolution Cluster Faculty Search Seminar: "Revolving door evolution of essential DNA packaging proteins"

    Lynch Lecture Hall (Chemistry)

    Mia Levine, Fred Hutchinson Cancer Research Center

    Our genomic DNA is packaged into distinct compartments that support essential, highly conserved cellular processes. Paradoxically, the 'chromatin' proteins that establish and maintain these compartments are strikingly unconserved. Sequence divergence and whole-gene turnover is common even between closely related species.

  • Postponed and Credit Away Exams

    Room A2,DRL Building

  • Evolution Cluster Faculty Search Seminar: "Hydrodynamics and collective behavior of the tethered bacterium Thiovulum majus"

    Lynch Lecture Hall (Chemistry)

    Alexander Petroff, Rockefeller University

    The ecology and dynamics of many microbial systems, particularly in mats and soils, are shaped by how bacteria respond to evolving nutrient gradients and microenvironments.  Here we show how the response of the sulfur-oxidizing bacterium Thiovulum majus to changing oxygen gradients cause cells to organize into large-scale fronts.  To study this phenomenon, we develop a technique to isolate and enrich these bacteria from the environment.  Using this enrichment culture, we observe the formation and dynamics of T. majus fronts in oxygen gradients.

  • Evolution Cluster Faculty Search Seminar: "Identifying key processes in the evolution of language"

    Lynch Lecture Hall (Chemistry)

    Christine Cuskley, Università La Sapienza

    Language forms the bedrock for all of our social interactions, be they interpersonal, performative, or economic. Understanding language therefore has the potential to further our understanding of a whole host of other social systems, and considering language from an evolutionary perspective is key to understanding it fully. This talk will focus on empirical findings in two areas in the evolution of language: the evolution of the lexicon, and evolutionary dynamics of language regularity.

  • Condensed Matter Seminar: "The memory of sand"

    Room A4, DRL

    Matthieu Wyart, New York University

    Complex systems are characterized by an abundance of meta-stable states. To describe such systems statistically, one must understand how states are sampled, a difficult task in general when thermal equilibrium does not apply. This problem arises in various fields of science, and here I will focus on a simple example, sand. Sand can flow until one jammed configuration (among the exponentially many possible ones) is reached.
  • Astrophysics and Cosmology Seminar

    DRL A6

    Samaya Nissanke (Caltech)

  • High Energy Theory Seminar

    DRL 2N36

    Alejandro Satz

  • Condensed Matter Seminar: "The Criticality Hypothesis: How cortical networks might optimize information processing"

    Room A4, DRL

    John Beggs , Indiana University

    To function optimally, living neuronal networks have been hypothesized to operate near a critical point, poised between a phase where activity is damped and a phase where activity is amplified. However, previous experimental evidence for critical dynamics has been controversial. Here we present new results to demonstrate that networks containing hundreds of cortical neurons are indeed operating near a critical point. This finding allows tools from statistical physics to be applied to the brain, and may point the way to a new description of healthy and diseased information processing.
  • Astrophysics and Cosmology Seminar

    DRL A4

    Lucianne Walkowicz (Princeton)