Linked Life Data

11537815

Source:http://linkedlifedata.com/resource/pubmed/id/11537815

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
1999-9-28
pubmed:abstractText
Aquatic animals have almost no body weight related proprioception for spatial orientation. Xenopus larvae, like fish, maintain their attitude in water by continuous correction with their fin(s). For these reasons a special performance of the equilibrium system compared to terrestrial animals is necessary. Evidently fish therefore have more compact (dense) otoliths; Xenopus larvae have less dense otolith (membranes) similar to land vertebrates; but their sacculus-otoliths are vertically positioned, which also may lead to a higher g-sensitivity. For plausibility reasons gravity should influence the embryonic development of gravity receptors. Yet, evaluations of photographs taken from the surface of cut deep-frozen objects by incident light show no aberration of the shape of the whole vestibulum and of the shape, density, size and position of the otolith membrane in larvae developed under near-zero g (NEXPA-BW-STATEX in D-1-Mission). The further evaluation of the "weightless-larvae" revealed a probably not yet described statolith-like formation in the dorsal wall of the vestibulum. In the weightless larvae this formation outnumbers, also qualitatively, strongly the l-g controls. An extra result is the lack of striking effects of cosmic radiation on the embryonic development of the flown Xenopus eggs. The swimming behavior of the larvae which was observed about one hour after landing of the Space Shuttle showed a typical anomaly (loop swimming), which is known from larvae developed on the clinostat or from fish flown aboard Apollo capsules.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
S
pubmed:status
MEDLINE
pubmed:issn
0273-1177
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NASA
pubmed:authorsComplete
Y
pubmed:pagination
151-6
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Survey of the vestibulum, and behavior of Xenopus laevis larvae developed during a 7-days space flight.
pubmed:affiliation
DFVLR-Institute for Aerospace Medicine, Cologne, FRG.
pubmed:publicationType
Journal Article