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The inhibitory effect of CO2 on the ecdysis of infective Haemonchus contortus cayugensis larvae

Published online by Cambridge University Press:  06 April 2009

J. Owen D. Slocombe  and
J. H. Whitlock
J. Owen D. Slocombe
Affiliation:
Department of Pathology, New York State Veterinary College, Cornell Univeristy, Ithaca, N. Y.
J. H. Whitlock
Affiliation:
Department of Pathology, New York State Veterinary College, Cornell Univeristy, Ithaca, N. Y.
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Extract

Infective Haemonchus contortus cayugensis larvae were stimulated to exsheath in 0·02 m-Na2B4O7. 10H2O, into which was bubbled CO2. The larvae under the exsheathing stimulus were found to be coiled and sluggish. The larvae became very active after most of the CO2 was removed by compressed air, oxygen or nitrogen. The exsheathment rate in each of the latter instances was higher than when larvae were exsheathed completely in an atmosphere of CO2. Carbon dioxide is an essential component of the exsheathing stimulus, but the continued presence of a high pCO2 or carbonic reaction products appeared to inhibit larval motility and caused lower exsheathment rates.

Type
Research Article
Information
Parasitology , Volume 61 , Issue 2 , October 1970 , pp. 253 - 258
Copyright
Copyright © Cambridge University Press 1970

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References

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