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X-WR-CALDESC:Events for Department of Theoretical Physics
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DTSTART:20210328T010000
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DTSTART;TZID=Europe/Ljubljana:20211005T130000
DTEND;TZID=Europe/Ljubljana:20211005T140000
DTSTAMP:20260427T233639
CREATED:20210923T100508Z
LAST-MODIFIED:20210929T105537Z
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SUMMARY:[Biophysics seminar] Antonio Šiber: "Mechanics of inactive swelling and bursting of porate pollen grains"
DESCRIPTION:The structure of pollen grains\, which is typically characterized by soft apertures in an otherwise stiff exine shell\, guides their response to changes in the humidity of the environment. These changes can lead to the desiccation of the grain and its infolding but also to excessive swelling of the grain and even its bursting. Here\, we use an elastic model to explore the mechanics of pollen grain swelling and the role that soft\, circular apertures (pores) play in this process. Small\, circular apertures typically occur in airborne and allergenic pollen grains so that the bursting of such grains is important in the context of human health. We identify and quantify a mechanical weakness of the pores\, which are prone to a rapid inflation once the grain swells to a critical extent. The inflation occurs as a sudden transition and may induce the bursting of the grain and the release of its content. This process crucially depends on the size of the pores and their softness. Our results provide insight in the inactive part of the mechanical response of pollen grains to hydration once they land on a stigma as well as on bursting of airborne pollen grains during changes in air humidity.\n\n\nThe meeting will take place online via Zoom: \nMeeting ID: 833 0750 1179 \nPasscode: bio
URL:https://web-f1.ijs.si/event/biophysics-seminar-antonio-siber-pollen-mechanics/
LOCATION:Zoom
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20211019T130000
DTEND;TZID=Europe/Ljubljana:20211019T140000
DTSTAMP:20260427T233639
CREATED:20210923T100632Z
LAST-MODIFIED:20211012T082813Z
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SUMMARY:[Biophysics seminar] Andraž Gnidovec: "Simulating the packing of spherical ellipses"
DESCRIPTION:Packing problems are abundant in nature and are thoroughly researched both experimentally and in numerical models. In particular\, packings of anisotropic\, elliptical particles emerge in models of liquid crystals\, colloids\, as well as granular and jammed matter. While most of these studies deal with packings in Euclidean geometries\, there are many experimental systems where anisotropically shaped particles are confined to a curved surface\, such systems of colloidal rods trapped at the interface of emulsion droplets\, and protein adsorbates on vesicles. \nIn this talk\, I will first present an algorithm we developed to determine overlaps between two spherical ellipses. More generally\, the proposed method allows us to define a continuous contact function that could also be applied to long-range interactions\, however\, the use case as a distance metric must be considered with care. Returning to the main objective of the algorithm\, I will demonstrate its efficiency in packing simulations. I will show the random close packing results for a monodispersed system of hard ellipses and present some challenges in the analysis of the configurations in comparison to the ellipse packings in Euclidean space.\n\n\nThe talk will be in the tea room at the F1 department. It will be simultaneously transmitted online via Zoom: \nMeeting ID: 833 0750 1179 \nPasscode: bio\n\n\n\n 
URL:https://web-f1.ijs.si/event/biophysics-seminar-andraz-gnidovec-packings-ellipses/
LOCATION:F1  tearoom
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DTSTART;TZID=Europe/Ljubljana:20211026T130000
DTEND;TZID=Europe/Ljubljana:20211026T140000
DTSTAMP:20260427T233639
CREATED:20210924T074520Z
LAST-MODIFIED:20211025T102206Z
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SUMMARY:[Biophysics seminar] Boris Rogelj: "Molecular and cellular basis of neurodegeneration"
DESCRIPTION:I will describe the basic molecular processes associated with disruption of homeostasis in a nerve cell and leading to neurodegeneration. We are mainly engaged in research into the causes of amyotrophic lateral sclerosis and frontotemporal dementia. We look at the mechanisms associated with mutations and with the altered behavior of certain genes\, RNAs\, and proteins. In particular\, we study the interactions of these molecules\, and their roles in processes such as nuclear transport\, cellular stress response\, and liquid-liquid phase separations characteristic of the formation of nonmembrane organelles.\n\n\nThe meeting will take place in the physics seminar room (106) in the main building.\n\n\n\n 
URL:https://web-f1.ijs.si/event/biophysics-seminar-boris-rogelj-basis-of-neurodegeneration/
LOCATION:Seminarska soba fizike (106)\, Jozef Stefan Institute (Jamova 39)\, Ljubljana
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