By Allson Burnett (Eds.)
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Additional resources for Biology of Hydra
S. (1972). Biol. Bull. 140, 502. Rushforth, N. , and Hofman, F. (1972). Biol. Bull. 142, 110. Rushforth, N. , Burnett, A. , and Maynard, R. (1963). Science 139, 760. Rushforth, N. , Krohn, I. , and Brown, L. K. (1964). Science 145, 602. 1. BEHAVIOR 41 Schaifer, J. (1754). " Regensburg. Schulusen, A. (1935). Zool. , Abt. Allg. Zool. Physiol. Tiere 54, 1. Schulze, P. (1917). Arch. Biontol. 4, 39. Singer, R. , Rushforth, N. , and Burnett, A. L. (1963). J. Exp. Zool. 154, 169. , and Frei, E. (1969).
While the mode of action is unknown it is probable that some chemical component of the food reduces the level of mechanical stimulation necessary at the cnidocil. Attempts have been made to identify the active material released by the food organisms (Jones, 1947). The action of the food extracts can be mimicked by surface-active agents and it is possible that the release of some agent of this sort is responsible for the depression of the threshold of the nematocyte to mechanical stimulation. There is also evidence that the different types of nematocysts are discharged specifically and that they are not all released simultaneously in response to a single stimulus.
Oligactis turns its head toward the cathode. This latter result was in accordance with an assumed electropolarity in most lower animals, in which the forward end has a positive charge (Hyman and Bellamy, 1922). However, the reason for the apparent polarity differences between the two species of Hydra has not been explained. Passano and McCullough (1964), in their description of the spontaneous 34 NORMAN B. RUSHFORTH electrical activity of Hydra, found that in many animals complete contraction of the body column takes place in a series of partial contractions.
Biology of Hydra by Allson Burnett (Eds.)