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Différents types de lignes de dislocations χ sont observés dans les cholesteriques a grand pas;ceux-ci dependent de la nature de la dislocation (ordre et signe) et de la nature de son couplage avec d'autres dislocations.
Les propriétiés des dislocations χ(∓1) et leur stabilité par rapport aux dislocations d'ordre inférieur (∓) montrent qu'au module de dislocation de Frank (1968) doit se substituer un modèle de dislocation à coeur nématique.
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