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X-WR-CALNAME:Department of Theoretical Physics
X-ORIGINAL-URL:https://web-f1.ijs.si
X-WR-CALDESC:Events for Department of Theoretical Physics
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BEGIN:VTIMEZONE
TZID:Europe/Ljubljana
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
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TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230105T140000
DTEND;TZID=Europe/Ljubljana:20230105T150000
DTSTAMP:20260426T155717
CREATED:20221121T131059Z
LAST-MODIFIED:20230103T142126Z
UID:6149-1672927200-1672930800@web-f1.ijs.si
SUMMARY:[Biophysics journal club] Domen Vaupotič: "Elastic properties and shape of the Piezo dome underlying its mechanosensory function"
DESCRIPTION:We will be discussing the following paper: https://www.pnas.org/doi/full/10.1073/pnas.2208034119 (“Elastic properties and shape of the Piezo dome underlying its mechanosensory function”).\n\n\nThe meeting will take place in the seminar room of physics (106).
URL:https://web-f1.ijs.si/event/biophysics-seminar-domen-vaupotic/
LOCATION:Seminar room of physics (106)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230110T140000
DTEND;TZID=Europe/Ljubljana:20230110T140000
DTSTAMP:20260426T155717
CREATED:20221223T184118Z
LAST-MODIFIED:20230109T081419Z
UID:7133-1673359200-1673359200@web-f1.ijs.si
SUMMARY:[Biophysics seminar] Jan Rozman: "Shape-tension coupling produces nematic order in an epithelium vertex model"
DESCRIPTION:We study the vertex model for epithelial tissue mechanics extended to include coupling between the cell shapes and tensions in cell-cell junctions. This coupling represents an active force which drives the system out of equilibrium and leads to the formation of nematic order interspersed with prominent\, long-lived +1 defects. The defects in the nematic ordering are coupled to the shape of the cell tiling\, affecting cell areas and coordinations. This intricate interplay between cell shape\, size\, and coordination provides a possible mechanism by which tissues could spontaneously develop long-range polarity through local mechanical forces without resorting to long-range chemical patterning.\n\n\nThe seminar will take place in the tearoom of the F1 department.
URL:https://web-f1.ijs.si/event/biophysics-seminar-jan-rozman-shape-tension-coupling-produces-nematic-order-in-an-epithelium-vertex-model/
LOCATION:F1  tearoom
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230112T111500
DTEND;TZID=Europe/Ljubljana:20230112T121500
DTSTAMP:20260426T155717
CREATED:20221103T105713Z
LAST-MODIFIED:20230112T111051Z
UID:5504-1673522100-1673525700@web-f1.ijs.si
SUMMARY:Maciej Kierkla: Conformal model for gravitational waves and dark matter. A status update
DESCRIPTION:We present an updated analysis of the first-order phase transition associated with symmetry breaking in the early Universe in a classically scale-invariant model extended with a new SU(2) gauge group.\nIncluding recent developments in understanding supercooled phase transitions\, we compute all of its characteristics and significantly constrain the parameter space. We then predict gravitational-wave spectra generated during this phase transition and by computing the signal-to-noise ratio we conclude that this model is well testable (and falsifiable) with LISA. We also provide predictions for the relic dark matter abundance. It is consistent with observations in a rather narrow part of the parameter space\, as we exclude the so-called supercool dark matter scenario based on an improved description of percolation and reheating after the phase transition as well as inclusion of the running of couplings.\nFinally\, we pay special attention to renormalisation-scale dependence of the results and even though our main results are obtained with the use of renormalisation-group improved effective potential\, we also present the outcome of a fixed-scale analysis. It proves that the dependence on the scale is not only qualitative but also quantitative.\nhttps://indico.ijs.si/event/1555/
URL:https://web-f1.ijs.si/event/maciej-kierkla-conformal-model-for-gravitational-waves-and-dark-matter-a-status-update/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230112T140000
DTEND;TZID=Europe/Ljubljana:20230112T150000
DTSTAMP:20260426T155717
CREATED:20221121T131149Z
LAST-MODIFIED:20230109T165730Z
UID:6151-1673532000-1673535600@web-f1.ijs.si
SUMMARY:[Biophysics journal club] Urška Andrenšek: "Muscular hydraulics drive larva-polyp morphogenesis"
DESCRIPTION:The meeting will take place in the seminar room of physics (room 106).
URL:https://web-f1.ijs.si/event/biophysics-journal-club-urska-andrensek/
LOCATION:Seminar room of physics (106)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230119T111500
DTEND;TZID=Europe/Ljubljana:20230119T121500
DTSTAMP:20260426T155717
CREATED:20221026T095035Z
LAST-MODIFIED:20230119T111740Z
UID:5319-1674126900-1674130500@web-f1.ijs.si
SUMMARY:Luka Leskovec: A lattice QCD study of B → π π l 𝜈
DESCRIPTION:$V_{ub}$ is the smallest and least known of all CKM matrix elements; it’s currently determined primarily through the exclusive process B → π l 𝜈. I will present progress toward a lattice QCD determination of the $V_{ub}$​ matrix element from a novel transition — the B → π π l 𝜈 process\, where the π π system is in a P-wave and features the ρ(770) resonance as an enhancement. The calculation is performed an ensemble with $N_f​=2+1$ isotropic clover fermions wiht $L≈3.6$ fm and a pion mass of 320 MeV; for the b-quark we use the anisotropic clover action. After a brief overview of the theoretical framework\, I will discuss some preliminary results.\nhttps://indico.ijs.si/event/1548/
URL:https://web-f1.ijs.si/event/jonathan-kriewald-tba/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (Zoom)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230119T140000
DTEND;TZID=Europe/Ljubljana:20230119T153000
DTSTAMP:20260426T155717
CREATED:20221130T091337Z
LAST-MODIFIED:20230118T072713Z
UID:6440-1674136800-1674142200@web-f1.ijs.si
SUMMARY:[DBS lunch seminar]: Marko Gosak\, "Quantifying Calcium Activity Patterns in Normal and Diabetic Pancreatic Islets of Langerhans with Network Analyses"
DESCRIPTION:Islets of Langerhans consist of a large functional syncytium of beta cells that produce pulses of insulin\, a key component for controlling metabolic homeostasis. In response to stimulation\, the islet cells display rather well-coordinated intercellular activity patterns\, which was found crucial for ensuring normal secretory patterns. However\, it is not clear how coordinated cellular rhythmicity emerges within the heterogeneous cellular collectives and how it is altered in diabetes. To address these questions\, we combined multicellular calcium imaging in mouse pancreatic tissue slices as well as in isolated human islets with advanced network analyses. Describing the intercellular activity patterns by means of network language has not only revealed that intercellular networks in islets share many architectural similarities with several other real-life networks\, such as small-worldness\, heterogeneity\, and modularity\, but also leads to important new insights into the relationship between cellular metabolic activity and the orchestration of collective behaviour [1\,2]. Importantly\, analyses of islets from diabetic donors have revealed that the intercellular activity in these islets is characterized by a lower fraction of global calcium waves and more segregated network structures [3]. However\, there was a rather large variability in responses in islets from donors with diabetes\, with some exhibited striking pathophysiological changes\, whilst others behaved rather normally. This great heterogeneity in susceptibility of different islets towards diabetogenic insults should be considered as an important aspect by conducting further research on the pancreatic islets. \n\n\n\n\nFigure: Analysis of calcium activity in the pancreatic cells in the islets of Langerhans and the generation of functional intercellular networks.\n\n\n\n[1] Gosak M\, et al.\, Network science of biological systems at different scales: A review\, Physics of Life Reviews 2018\, 24. \n[2] Stožer A\, et al.\, From isles of Königsberg to islets of Langerhans: Examining the function of the endocrine pancreas through network science\, Frontiers in Endocrinology 2022\, 922640. \n[3] Gosak M\, et al.\, Ca2+ oscillations\, waves\, and networks in islets from human donors with and without type 2 diabetes\, Diabetes 2022\, 71. \n\n\n\nThe seminar will take place in the lecture hall of the International Postgraduate School (MPŠ\, https://www.mps.si/en/o-nas/lokacija/) at the Jožef Stefan Institute. It will be followed by discussion and snacks.
URL:https://web-f1.ijs.si/event/dbs-seminar-marko-gosak/
LOCATION:Lecture hall of IPS (MPŠ)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20230126T140000
DTEND;TZID=Europe/Ljubljana:20230126T150000
DTSTAMP:20260426T155717
CREATED:20221121T131224Z
LAST-MODIFIED:20230123T182938Z
UID:6153-1674741600-1674745200@web-f1.ijs.si
SUMMARY:[Biophysics seminar] Tanmoy Sarkar
DESCRIPTION:I will present a new approach to studying epithelial mechanics\, which is based on representing the tissue structure by a graph. As a proof of concept\, I will study a tissue with random cell rearrangements and compare the results with an alternative approach\, based on a Markov chain.\n\n\nThe meeting will take place in the seminar room of physics (106).
URL:https://web-f1.ijs.si/event/biophysics-seminar-tanmoy-sarkar/
LOCATION:Seminar room of physics (106)
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