The next webinar of the Optical and Neutron Spectroscopy Subdivision of the DCP will focus on “Spectroscopic Approaches to the Study of Molecular Chirality.”
Our two speakers will be:
Date: November 29, 2024, at 11:00 AM
Registration is required to receive the connection link at the following address:
https://cnrs.zoom.us/meeting/register/tJ0scuCopjgrHdZ4RQ5QHu1o4cs7ZOU2BbMx
We hope to see many of you there!
The SON Subdivision Committee
Dr. Marc Dussauze
CNRS Researcher
University of Bordeaux – Institut des Sciences Moléculaires
Bat. A12, 351 cours de la Libération, 33405 Talence CEDEX, FRANCE
Phone: (+33) (0)5 40 00 63 61
Email: marc.dussauze@u-bordeaux.fr
https://gsm.ism.u-bordeaux.fr/
It unfolds within the intricate playground of virus self-assemblies – used as model system of chiral particles – to form helical liquid crystals. These chiral liquid crystals exhibit a fascinating duality: simple in structure yet complex in behavior. This work explores the physical mechanisms governing chirality transfer for two distinct virus mutants, M13 and Y21M. Despite their high structural similarity, these viruses exhibit cholesteric liquid crystalline phase phases with opposite handedness. This seemingly apparent paradox stems from the subtle interplay between steric repulsion, chiral supramolecular virus deformations, and electrostatic forces.
For the stiff Y21M virus strain, the local electrostatic interactions, which are highly sensitive to both ionic content and the detailed atomic symmetries of the capsid, play a crucial role. In this case, the molecular chirality originates primarily from the subtle helical distribution of surface charges around the symmetry axes of the capsid.
In contrast, the chirality of the M13 virus arises from weak, fluctuation-induced suprahelical deformations of its backbone. This chirality transfer and the resulting helical phase are chiefly driven by steric interactions occuring at the supramolecular length scale of the viruses themselves.
Overall, this study provides a quantitative description of chirality transfer across different length scales. It reveals the complex interplay of competing chiral interactions with opposite signs, governing the emergence of chiral structures and helical morphologies.
'Helical Polymers with Static Memory of Helicity'.
'Double-Stranded Helical Foldamers with Unique Chiroptical Properties and Chiral Functions '
'Helical Polymers with Static Helicity Memory: Synthesis and Applications'
24th of Mai 2024INFORMATIONS : The kinoa-day will take place at IECB building.Allotted time slots include a question and answer session, typically lasting 3 to 5 minutes, depending on the length of the presentations |
PROGRAM :
10h40 -11h10 : Coffee break/poster installation
12h10-13h30 : lunch/discussions and poster’s presentation
15h45 -16h10 : Coffee break/posters
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deadline to submit a title for an oral presentation at the 3th Ki-NOA day (24/05/2024) on the framapad sent by email. Through the same framapad, the registration is free but mandatory
deadline to registration (free but mandatory) to the 3th Ki-NOA day (24/05/2024) on the framapad sent by email
Les 6 et 7 juin 2024 sera lancé officiellement le PEPR LUMA à Bordeaux. La communauté des interactions lumière matière se rassemblera pour l’inauguration institutionnelle et scientifique, incluant la présentation des Moonshot Projects (les résultats de l’AMI seront connus courant mars), du Hub Infrastructures LUMA, ainsi que le lancement des futurs appels à projets LUMA. Réservez les dates, l’événement est gratuit et largement ouvert à toutes et tous, nous espérons vous y voir nombreux ! Plus d’informations à venir.
https://www.pepr-luma.fr/