The mean square projections of the end-to-end separation and radius of gyration along and perpendicular to the nematic director are determined for semiflexible polymer chains at the isotropicnematic transition. The polymer chains are assumed to obey the Saito-Takahashi-Yunoki distribution for wormlike chains, interacting with each other through an Onsager-type excluded volume interaction, accurate to the second virial approximation.
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