Definitions
from The Century Dictionary.
- noun The typical genus of Xenopodidæ. There are several species, all of tropical Africa, as X. lævis. They are called
clawed toads .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun A taxonomic
genus within thesubfamily Xenopodinae — theclawed frogs .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an African clawed frog; in some classifications made the type genus of a separate family Xenopodidae
Etymologies
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Examples
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Appearance of water channels in Xenopus oocytes expressing red cell CHIP28 protein by G.M. Preston, T.P. Carroll, W.B. Guggino, and P. Agre, Science 256 (1992), p. Molecular Mechanisms for Human
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"Appearance of water channels in Xenopus oocytes expressing red cell CHIP28 protein".
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It seemed that proper use of recombinant channels in Xenopus oocytes could only be made in combination with single channel conductance measurements.
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In the first two examples, and to a lesser extent in large animal zygotes that undergo post-zygotic development without external sources of nutrition (e.g. Xenopus), the resulting hierarchies are fully nested and display the property of summativity.
A New Book 2010
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In the first two examples, and to a lesser extent in large animal zygotes that undergo post-zygotic development without external sources of nutrition (e.g. Xenopus), the resulting hierarchies are fully nested and display the property of summativity.
A New Book 2010
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Xenopus provides a good model for thyroid hormone effects because the metamorphosis from tadpole to frog is heavily mediated by thyroid hormone.
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Researchers are working to develop animal models of gene regulation by thyroid hormone including one that studies the metamorphosis from tadpole (above) to frog of the African clawed frog (Xenopus laevis). image credit: Dennis Kunkel
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The bulk of these endemics consist of the highly variable Reed Frogs (Hyperolius, 9 strict endemics), the Screeching frogs (Phrynobatrachus, 7 strict endemics) and the River Frogs (Anthroleptis, 5 strict endemics) and Clawed Toads (Xenopus, 3 strict endemics).
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Howdeshell is working to develop a model of the African clawed frog, Xenopus laevis, to shed light on gene regulation by thyroid hormone in human processes including brain development.
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"While Xenopus studies cannot be directly extrapolated to human development," says Howdeshell, "the thyroid hormone system is conserved across all vertebrates, including rats and humans, and Xenopus undergo thyroid hormone-directed brain maturation similar to the brain development of more complex vertebrates."
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