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On the permeability of cestodes to colloids: an evaluation of the transmembranosis hypothesis*

Published online by Cambridge University Press:  06 April 2009

Richard D. Lumsden ,
Lawrence T. Threadgold ,
John A. Oaks  and
C. Arme
Richard D. Lumsden
Affiliation:
Laboratory of Parasitology, Department of Biology, Tulane University, New Orleans, Louisiana, U.S.A.
Lawrence T. Threadgold
Affiliation:
the Department of Biology, Rice University, Houston, Texas, U.S.A.
C. Arme
Affiliation:
the Department of Biology, Rice University, Houston, Texas, U.S.A.
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Summary

Adult Hymenolepis diminuta were tested for their ability to transport colloids under in vitro and in vivo conditions. The tracers employed included colloidal thorium dioxide (Thorotrast), carbon (Pelikan Ink), ferritin and the 14C-labelled protein fraction from Chlorella vulgaris. Though certain of these tracers were adsorbed to the external surface of the tegument plasmalemma, no evidence for the assimilation of any of these colloids was obtained in the present study. Further, significant differences in size and structure between the granular inclusions reported earlier by Rothman (1967) as assimilated colloids and the particles present in the respective colloidal suspensions were noted. Results of this investigation are interpreted as rendering untenable previous conclusions concerning transmembranosis of colloids by tapeworms.

Type
Research Article
Information
Parasitology , Volume 60 , Issue 2 , April 1970 , pp. 185 - 193
Copyright
Copyright © Cambridge University Press 1970

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