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Gravity as a probe for understanding pattern specificationAmphibian eggs from Xenopus laevis were employed as a model system. Xenopus embryos were demonstrated to be sensitive to novel force fields. Under clinostat-simulated weightlessness the location of the third cleavage furrow was shifted towards the equator; the dorsal lip was shifted closer to the vegetal pole; and head and eye dimensions of hatching tadpoles were enlarged. Effects of centrifuge-simulated hypergravity were the opposite of those of simulated weightlessness. Those morphological alterations had their own force-sensitive period, and a substantial spawning-to-spawning variation in sensitivity was observed. Despite those dramatic differences in embryogenesis, tadpoles at the feeding stage were largely indistinguishable from controls.
Document ID
19940008945
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Malacinski, George M. (Indiana Univ. Bloomington, IN, United States)
Neff, Anton W. (Indiana Univ. Bloomington, IN, United States)
Date Acquired
September 6, 2013
Publication Date
August 28, 1993
Subject Category
Geophysics
Report/Patent Number
NASA-CR-194142
NAS 1.26:194142
Accession Number
94N13418
Funding Number(s)
CONTRACT_GRANT: NAGW-1548
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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