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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Parasitology research 44 (1974), S. 211-226 
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The cercaria of Cryptocotyle lingua responds to the onset of mechanical vibrations and to a decrease in light intensity by an increase in activity. The cercaria shows a decline in activity with age and an increase in activity with increasing temperature. Stimulation by host extract also initiates an increase in activity and penetration behaviour. A similar series of responses were found with amines of chain length C7–C9. Evidence is presented that the activity rhythm, intrinsic to the tail, may be modified by a pacemaker in the body of the cercaria. This pacemaker may be influenced by a variety of exogenous and endogenous stimuli.
    Type of Medium: Electronic Resource
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