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DTSTART;TZID=Europe/Paris:20211109T140000
DTEND;TZID=Europe/Paris:20211109T160000
DTSTAMP:20260428T122338
CREATED:20210915T080726Z
LAST-MODIFIED:20211011T094825Z
UID:6445-1636466400-1636473600@fermi.univ-tlse3.fr
SUMMARY:Topological barriers of the bacterial genome (Marc Joyeux / LPT / Seminar) - 9/11\, 14H.
DESCRIPTION:Marc Joyeux (Université Grenoble Alpes) \nBacterial genomes are partitioned into several kilobases long chromosomal domains that are topologically independent from each other\, meaning that changes of DNA superhelicity in one domain do not propagate to neighbors. Both in vivo and in vitro experiments have been performed to question the nature of the topological barriers at play\, leading to several predictions on possible molecular actors. \nIn this talk\, I will address the question of topological barriers using coarse-grained polymer models of supercoiled DNA chains\, which are constrained such as to mimic the action of predicted molecular actors. More specifically\, I will first discuss under which conditions DNA-bridging proteins may act as topological barriers. Then\, I will address the question of the effect of topological barriers on DNA subject to both tension and torque and discuss the mechanism that allows DNA loops secured by a topological barrier to constrain a number of gyres much larger than expected from their length.
URL:https://fermi.univ-tlse3.fr/event/topological-barriers-of-the-bacterial-genome-marc-joyeux-lpt-seminar/
LOCATION:Visio
CATEGORIES:Events,LPT,Seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20211116T140000
DTEND;TZID=Europe/Paris:20211116T160000
DTSTAMP:20260428T122338
CREATED:20211025T100211Z
LAST-MODIFIED:20211025T100211Z
UID:7533-1637071200-1637078400@fermi.univ-tlse3.fr
SUMMARY:Advances in optical spectroscopies of solids : Insight from ab initio simulations (Nicolas Tancogne-Dejean / LPT / Seminar) - 16/11 - 14H.
DESCRIPTION:Nicolas Tancogne-Dejean (MPSD\, Hambourg) \nAll-optical spectroscopy of matter is a well-established technique to access properties of electrons and quasi-particles in matter. The description of these optical properties is usually done employing ab initio methods based on linear response theory. \nThe recent advances in experimental techniques have opened up the possibility to develop novel types of spectroscopies based ultrashort and intense laser pulses\, allowing for instance to access non-equilibrium dynamics of electronic systems or to allow for exploring non-equilibrium phase diagram of correlated materials. In particular\, the strong-field electronic dynamics in solids has received a lot of attention\, in particular due to the experimental observation of high-harmonic generation in solids. The dynamics associated with strong fields implies the manipulation of the electrons on the attosecond time-scale\, which could lead to tremendous applications in the emerging fields of strong-field optoelectronics and petahertz electronics\, as well as the spectroscopy of phenomena occurring on the attosecond to femtosecond timescale. \nIn this talk\, we show that ab initio calculations\, performed within the framework of real-time time-dependent density functional theory (TDDFT)\, can help unraveling the microscopic mechanisms responsible for strong-field physics in solids. The predictive power of this approach is demonstrated by directly comparing the simulations results to the experimental data. Interesting phenomena are predicted to occur when a strong laser interacts with different type of bulk materials\, including correlated magnetic materials. Finally\, the capability to describe low-energy magnetic excitation (magnons) will be discussed.
URL:https://fermi.univ-tlse3.fr/event/advances-in-optical-spectroscopies-of-solids-insight-from-ab-initio-simulations-nicolas-tancogne-dejean-lpt-seminar-16-11-14h/
LOCATION:Visio
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20211123T140000
DTEND;TZID=Europe/Paris:20211123T160000
DTSTAMP:20260428T122338
CREATED:20211105T095254Z
LAST-MODIFIED:20211129T080856Z
UID:7561-1637676000-1637683200@fermi.univ-tlse3.fr
SUMMARY:Hydrodynamic flow and concentration gradients in the gut enhance neutral bacterial diversity (Darka Labavic  / LPT / seminar). - 23/11\, 14 H.
DESCRIPTION:Darka Labavic (Laboratoire Jean Perrin)  – en visio \nIn humans\, the digestive tract contains the majority if the microbiota which is essential for the health of an individual. The digestive tract itself\, is a complex system from a point of view of geometry\, fluid mechanics\, population dynamics\, and biodiversity. In this work\, we propose a minimal model of evolution of bacteria in the gut. Because most bacteria in the human digestive tract are located in the bulk of the colon lumen\, we focus on this compartment. Since most bacteria in the digestive tract have no self-motility\, we consider that they are carried passively with the digesta. The motion of the digesta is complex\, but it can be approximated as a one-dimensional flow with net velocity and effective diffusion representing mixing. Within this model of the gut that includes hydrodynamic flow and resulting gradients of food and bacterial concentrations\, we ask how the fixation probability of a neutral mutant compares with that in an equivalent well-mixed chemostat. We find that the structure of the gut can increase this fixation probability\, specifically in the regime where the profiles of food and bacterial concentration are strongly spatially-dependent. In this regime\, fixation probability becomes independent of total population size\, in stark contrast with a well-mixed population\, where fixation probability is inversely proportional to total population size. We show that this behavior can be understood by introducing the notion of active population\, which corresponds to the fraction of the bacterial population that is actively consuming food and dividing.
URL:https://fermi.univ-tlse3.fr/event/hydrodynamic-flow-and-concentration-gradients-in-the-gut-enhance-neutral-bacterial-diversity-darka-labavic-lpt-seminar-23-11-14-h/
LOCATION:Visio
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20211124T140000
DTEND;TZID=Europe/Paris:20211126T140000
DTSTAMP:20260428T122338
CREATED:20211116T081116Z
LAST-MODIFIED:20211116T081331Z
UID:7565-1637762400-1637935200@fermi.univ-tlse3.fr
SUMMARY:Theory Days 2021 (LPT / 24-26/11)
DESCRIPTION:Theory Days 2021 : New computational methods for electronic dynamics \nOrganizers : M. Belkacem\, M. Rapacioli\, P. M. Dinh\, and E. Suraud \nWhere : excusively via visioconferencing with zoom \n\nProgram and the zoom links : Here
URL:https://fermi.univ-tlse3.fr/event/theory-days-2021-lpt-24-26-11/
LOCATION:Visio
CATEGORIES:Events,LPT,Symposium / Congress
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