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Effects of Clinostat Rotation on Aurelia Statolith SynthesisAurelia ephyrae develop eight graviceptors (rhopalia) during their metamorphosis from polyps, which are used for positional orientation with respect to gravity. In three experiments for each speed of 1/15, 1/8, 1/2, 1, and 24 rpm, groups of six polyps were rotated in the horizontal or vertical plane (control) using clinostats. Other controls were kept stationary in the two planes. Ten ephyrae from each group were collected after 5 to 6 days at 27 C in iodine and the number of statoliths per rhopalium were counted. Statistical analyses of statolith numbers revealed that horizontal clinostat rotation at 1/4 and 1/2 rpm caused the formation of significantly fewer statoliths per rhopalium than were found in controls. The finding that these slow rates of rotation reduces statolith numbers suggests that the developing ephyrae were disoriented with respect to gravity at these speeds, causing fewer statocytes to differentiate or to mineralize.
Document ID
19910016268
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Spangenberg, Dorothy B. (Eastern Virginia Medical School Norfolk, VA, United States)
Davis, S. (Eastern Virginia Medical School Norfolk, VA, United States)
Ross-Clunis, H., III (Eastern Virginia Medical School Norfolk, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1991
Publication Information
Publication: NASA. Lyndon B. Johnson Space Center, Spacelab Life Sciences 1: Reprints of Background Life Sciences Publications
Subject Category
Life Sciences (General)
Accession Number
91N25582
Funding Number(s)
CONTRACT_GRANT: NAG2-243
Distribution Limits
Public
Copyright
Public Use Permitted.

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