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Preliminary observations on the effects of vector-averaged gravity on the embryonic and larval development of the gastropod mollusk, Ilyanassa obsoleta StimpsonFertilized eggs of Ilyanassa obsoleta Stimpson were collected immediately after their deposition in egg capsules. Unopened egg capsules then were affixed to glass slides, and incubated either statically (controls) or on a clinostat (experimentals). After incubation for 9-14 days, hatching occurred sooner and in a higher percentage of clinostated capsules than in controls. Embryos that hatched while undergoing clinostat incubation were abnormal in morphology, whereas other embryos present in non-hatched capsules in the same tubes appeared normal, as did embryos in the control tubes. Although the results are compatible with a conclusion that vector-averaged gravity in the experimental tubes caused the altered development, some other aspects of how the incubations were done may have contributed to the differences between the control and experimental results.
Document ID
20040090346
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Conrad, G. W.
(Mount Desert Island Biological Laboratory Salsbury Cove, Maine 04672, United States)
Stephens, A. P.
Conrad, A. H.
Spooner, B. S.
Date Acquired
August 21, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Transactions of the Kansas Academy of Science
Volume: 96
Issue: 2-Jan
ISSN: 0022-8443
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-1197
CONTRACT_GRANT: NAGW-2328
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cell Biology
NASA Program NSCORT
Non-NASA Center
NASA Discipline Developmental Biology
NASA Discipline Number 93-10

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