Abstract

A rhodoquinone (RQ) has been isolated from Stephanurus dentatus and has been shown to be identical with RQ-9 from Ascaris lumbricoides var. suis (A. suum). The ratio of RQ/mg N is fairly constant among larval, juvenile, and adult forms of S. dentatus with an average value of 1.63 μg/mg N. A Chromatographie survey found RQ in all eleven species of helminths tested. Ubiquinone (UQ) was found in all larval forms, a free living nematode ( Rhabditis strongyloides) and helminths with prepatent periods shorter than 35 days.

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