| Author Title Journal |
Wiercinski FJ (1939) The effects of supersonic vibrations on reconstitution and head frequency in Euplanaria dorotocephala. Physiol Zool 12(1): 62-69 |
Abstract / Notes
With a certain range of intensity and duration of exposure, supersonics bring about cytolysis in whole individuals of E. dorotocephala. This cytolysis progresses from the anterior end posteriorly in the anterior zooid, just as is the case when the worms are exposed to certain other physical and chemical agents. On return to water after partial cytolysis, reconstitution occurs. Worms exposed in groups of few individuals are more susceptible than in groups of many individuals. In general the effect increases with intensity and duration of exposure, but individual differences occur as with other agents. For detn. of the effect on head frequency, exptl. and control lots of pieces A, B, C, and D (approximately successive fourths of the anterior zooid) were used, since these pieces give progressive decrease and a wide range of head frequency from A to D. Effective intensities and exposure times were detd. by preliminary expt. Lots were exposed immediately after section and following various periods of delay. With exposure immediately after section little change in head frequency occurred. With delayed exposure an increase in head frequency occurs and is apparently greater with certain periods of delay than with longer or shorter periods.| Home page -- (Main hierarchy) |