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X-WR-CALNAME:Bordeaux Neurocampus
X-ORIGINAL-URL:https://www.bordeaux-neurocampus.fr/en/
X-WR-CALDESC:Events for Bordeaux Neurocampus
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DTSTART;TZID=Europe/Paris:20231117T113000
DTEND;TZID=Europe/Paris:20231117T113000
DTSTAMP:20260410T160636
CREATED:20230321T135509Z
LAST-MODIFIED:20231108T171945Z
UID:157505-1700220600-1700220600@www.bordeaux-neurocampus.fr
SUMMARY:Friday Seminar - Ludovic Telley
DESCRIPTION:Venue : Centre Broca \n\nLudovic Telley\nUniversité de Lausanne\nhttps://wwwfbm.unil.ch/dnf/group/molecular-mechanisms-of-cerebellar-development/member/telley-ludovic-telley\n\nInvited by Matthieu Letellier\n\nTitle\nThe molecular logic of cerebellar diversity and assembly\nAbstract\nThe lab of Ludovic Telley is interested in understanding the molecular programs that control neuron differentiation\, interactions and assembly thus leading to functional circuits required as the bases for its many functions. His lab combines single-cells technologies\, bioinformatic tools and in vitro/in vivo gain and loss of function strategies. \n
URL:https://www.bordeaux-neurocampus.fr/en/event/seminar-17-november-2023/
CATEGORIES:For scientists,home-event,Seminars
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DTSTART;TZID=Europe/Paris:20231117T113000
DTEND;TZID=Europe/Paris:20231117T113000
DTSTAMP:20260410T160636
CREATED:20231109T142250Z
LAST-MODIFIED:20231113T170314Z
UID:164248-1700220600-1700220600@www.bordeaux-neurocampus.fr
SUMMARY:Impromptu seminar - Liangyi Chen
DESCRIPTION:Venue: CGFB \n\nLiangy Chen\nSchool of Future Technology\nPeking University \nInvited by Daniel Choquet \nTitle\nQuantitative and holistic superresolution live-cell imaging: from structured illumination microscopy to the sparse deconvolution algorithm \nAbstract\nHere we present an overview of our recent works in live-cell superresolution (SR) microscopy. Over the past five years\, we have developed several innovative techniques to improve the resolution and accuracy of live-cell imaging. \nOur first breakthrough was the development of a structured illumination microscopy technique based on the continuity of biological structures embedded in Hessian matrices (Hessian-SIM). Hessian-SIM significantly reduces the photon dosage required for SR microscopy while suppressing reconstruction artifacts induced by random noise. Additionally\, we demonstrated that the high sensitivity of this method allows for the use of sub-millisecond excitation pulses followed by dark recovery times\, reducing photobleaching and enabling hour-long time-lapse SR imaging with common fluorescent probes in live cells (Nat. Biotechnol. 2018). \nTo enable holistic SR imaging\, we developed a dual-mode microscopy technique that combines SIM with label-free three-dimensional optical diffraction tomography (ODT). By providing a holistic view of organelles and simultaneously highlighting molecules\, this method is ideal for studying organelle interactomes. We demonstrated that the ODT module can resolve mitochondria\, lipid droplets\, the nuclear membrane\, chromosomes\, the tubular endoplasmic reticulum\, and lysosomes (Light Sci Appl. 2020). \nTo further push the resolution limit of live-cell SR imaging\, we developed a two-step iterative deconvolution algorithm based on continuity and sparsity of fluorescence signals (Sparse deconvolution)\, which extends resolutions beyond the physical limits of optical systems. Sparse-SIM achieving ~60 nm resolution at a 564 Hz frame rate\, resolving dynamics of ring-shaped nuclear pores over an hour in live cells. The algorithm can also be used to improve resolutions of other fluorescence microscopes\, such as confocal\, STED\, and lightsheet microscopes. Thus this mathematical path to improve microscopic resolution may have broad implications (Nat. Biotechnol. 2022). \nFinally\, for live-cell SR imaging to be quantitative\, the completeness of delicate structures and the linearity of fluorescence signals are required in addition to resolution. To make live-cell SIM microscopy more quantitative\, we proposed a physical model-based background removal method (BF-SIM). BF-SIM preserves intricate and weak structures down to sub-70 nm resolution while maintaining signal linearity\, enabling us to discover novel\, dynamic actin structures in live cells (Nat. Commun. 2023). \n
URL:https://www.bordeaux-neurocampus.fr/en/event/impromptu-seminar-liangy-chen/
CATEGORIES:For scientists,home-event,Impromptu seminar
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