Author Archives: valerie

Elucidating chirality transfer in liquid crystals of viruses

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2024-05-30
News:
How does the propagation of chirality across various length scales take place?

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.

Laboratory : CRPP

seminar of Prof. Yoshihiko Togawa (Osaka Metropolitan Univeresity) : A role of chirality: Generation and transfer of spin and phonon angular momenta

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2024-07-05
News: We discuss a role of chirality in materials, being inspired by recent studies on chirality-induced selectivity of spin and phonon angular momenta with chiral materials. A comprehensive understanding of these nontrivial phenomena will clarify the interplay between structural and dynamical chirality.
when ? 05/07, 14h-15h
where ? IECB
Laboratory : CBMN

The 3 seminars

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2024-05-14
News: Here are the 3 seminars delivered by Pr. Eiji Yashima in the upcoming month  :
  • On the 16th of May at 1:00 PM, a seminar will be held at LCPO on

    'Helical Polymers with Static Memory of Helicity'.

  • On the 21th of May during the journée GPR-LIGHT at IOA on

    'Double-Stranded Helical Foldamers with Unique Chiroptical Properties and Chiral Functions '

  • On the 24th of May during the KiNOA Day at IECB (at 9H05 AM)on

    'Helical Polymers with Static Helicity Memory: Synthesis and Applications'

About the Pr. Eiji Yashima: https://www.chembio.nagoya-u.ac.jp/labhp/polymer4/e/publication/pub_yashima.html
Laboratory : all laboratories

The third KiNOA’s day

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24th of Mai 2024

INFORMATIONS : 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 :

  • 8h50-9h05 : Welcome
  • 9h05-9h50 : Eiji Yashima (Nagoya University) :Helical polymers with static helicity memory: Synthesis and applications
  • 9h50-10h05 : Victor Maurizot (CBMN) :Beta-sheet mimic foldamers
  • 10h05-10h20 : Robin Hess (CBMN) : Designing aromatic oligoamide cone-shaped carbohydrate receptors
  • 10h20-10h40 : Guillaume Gimenez (ISM) : Self-coacervation of polyampholytes for chiral separation of enantiomers

10h40 -11h10 : Coffee break/poster installation

  • 11h10-11h40 : Yann Mairesse (CELIA) : Laser-induced electron diffraction in chiral molecules
  • 11h40-12h10: Ludovic Jaubert (LOMA) :Chirality in magnetic crystals: from skyrmions to anomalous Hall effect

12h10-13h30 : lunch/discussions and poster’s presentation

  • 13h30-14h15 : Jeanne Crassous (ISCR, Rennes University) : Chirality and multifunctionality in helicene-based chemical platforms
  • 14h15-14h25: Anthony Boudier (CBMN/ISM) : Induction of chiroptical properties on achiral organic molecules at different scales, from nanometric to millimetric size
  • 14h25-14h35 : : Matheus Mendes (CBMN) : Template-assisted chirality induction to magnetic nanoparticles using silica nanohelices. Towards new magneto chiral responsive nanocomposites
  • 14h35-15h15 : Elizabeth Hillard/Nazanin Kordestani (ICMCB) : Recent adventures in X-ray optical activity
  • 15h15-15h45 : Eric Grelet (CRPP) : Origin of chirality transfer in virus self-assembly

15h45 -16h10 : Coffee break/posters

  • 16h10-16h40: Laurent Bouffier (ISM) : Circularly polarized electrogenerated chemiluminescence
  • 16h40-17h10: Vincent Rodriguez (ISM) :Hyper-Rayleigh and third-harmonic optical activity in chiral liquids

Autour du prix Nobel de Physique 2023, Physique Attoseconde : Genèse et Applications Récentes

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Le 29 mars le Pr. Anne L’Huillier donnera une « Nobel Lecture » dans le cadre d’un Symposium « Physique Attoseconde : Genèse et Applications Récentes » sous l’égide du Département Sciences de la Matière et du Rayonnement. Le symposium se déroulera à L’Agora de 9h00 à 12h30 et sera suivi d’un cocktail déjeunatoire. Nous vous attendons nombreux à cet événement scientifique grand public qui permettra d’échanger avec la Pr. Anne L’Huillier.
Evènement gratuit avec inscription obligatoire via le framaform envoyé par email  le 08 mars 2024.

Inauguration du PEPR LUMA

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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/

3th Ki-NOA day : friday 24th of May : Prof. Yashima,

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  • This year, we are honored to host Prof. Yashima, a distinguished expert in helical polymers (https://www.chembio.nagoya-u.ac.jp/labhp/polymer4/e/publication/pub_yashima.html)
  • You will shape the program of the day =>Submit either with an oral or a poster (on the framalink sent the 28/02/2024 by email), a comprehensive title and whether you would prefer a 10/20/30min duration for a talk  =>deadline April 8th
  • Share this information/email/framalink with your colleagues, students, or postdocs (whether registered in the Ki-NOA or not)
  • Registration is free but mandatory via the framalink
  •  Deadlines:
    • Title submission for your talk or poster: April 8th
    • Event registration (including lunch and coffee breaks): April 30th
    • Final program will be communicated on May 2nd.