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We discuss the defects and the macroscopic properties which can result when a biaxial nematic is chiralized. A "biaxial" cholesteric phase is possible, where two axes of the triad of unit vectors spiral around the third one. In contrast to "ordinary" cholesteric liquid crystals, λ defects have a singular core. Probably this type of cholesteric liquid crystal has been observed very recently.
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Pleiner et al. (1985) studied this question.
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