Graviceptor development in jellyfish ephyrae in space and on Earth
| Autor: | T. Jernigan, B.T. Lowe, D.B. Spangenberg, C. Philput |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Atmospheric Science
Jellyfish biology Scyphozoa Sensory Receptor Cells Weightlessness Aerospace Engineering Zoology Sense Organs Astronomy and Astrophysics Space Flight Rhopalium biology.organism_classification Statocyst Microscopy Electron Geophysics Space and Planetary Science biology.animal General Earth and Planetary Sciences Aurelia aurita Animals Gravity Sensing Mechanoreceptors Mechanoreceptor Cells |
| Zdroj: | Advances in space research : the official journal of the Committee on Space Research (COSPAR). 14(8) |
| ISSN: | 0273-1177 |
| Popis: | Graviceptor (rhopalium) development in Aurelia aurita ephyrae which developed on Earth and in space during the nine-day NASA SLS-1 mission was compared. The space-developed ephyrae made graviceptors which were morphologically similar to those of their ground-based controls. Rhopalia of both groups developed statocysts with statoliths, ocelli, ciliated mechanoreceptor cells, and immature touch-plates with one type of hair cell. The number of rhopalia formed per arm of ephyrae of both groups revealed no significant differences. The number of statoliths formed per rhopalium was statistically higher in ephyrae which were induced to form in space with iodine than in L(Launch)+8h controls. Statolith numbers were not significantly different between Earth-formed control ephyrae and those formed from polyps induced on Earth and then sent into space 24h and 48h later. Statolith loss from rhopalia was significantly enhanced in the space-maintained ephyrae in ASW as compared to their controls. Ephyrae formed through thyroxine treatment and those maintained in thyroxine in space had statolith numbers comparable to thyroxine-treated controls. Pulsing abnormalities seen in some space-developed ephyrae suggest that some space-formed ephyrae may have developed abnormal rhopalia because normal rhopalia development and function is necessary for normal pulsing. |
| Databáze: | OpenAIRE |
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