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  • Deep Sea Drilling Project; DSDP; Ocean Drilling Program; ODP  (1)
  • Egg evolution  (1)
  • 2000-2004  (2)
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  • 2000-2004  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Ectopic expression of Xenopus noggin RNA induces complete secondary body axes in embryos of the direct developing frog Eleutherodactylus coqui (2000)
    Springer
    Development genes and evolution 210 (2000), S. 21-27 
    Details
    ISSN: 1432-041X
    Keywords: Key words Noggin ; Direct development ; Egg evolution ; Head development ; Body axis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We tested the effects of noggin RNA from Xenopus laevis on axis induction in embryos of a direct developing frog, Eleutherodactylus coqui. We microinjected noggin RNA into one blastomere of 4-cell embryos at the site close to the animal pole, and found that overexpression of noggin RNA is not only sufficient to induce additional axes but also induces heads with eyes. We also injected noggin RNA into 8-cell or 16-cell embryos in various sites, including the marginal zone, above the marginal zone, and the vegetal pole, and found the formation of a complete secondary axis in all three types of injection. These effects of X. laevis noggin RNA on the E. coqui embryo are remarkably different from those found in the X. laevis embryo itself. It has been shown previously that overexpression of noggin RNA on the ventral side of the normal X. laevis embryo induces only a partial axis, with no head structures. We show here that the failure of noggin induction of a complete axis when overexpressed on the ventral side of the X. laevis embryos is not due to an insufficient amount of RNA injected. Also, the failure is unlikely due to inhibition from the primary axis since noggin RNA can induce duplicated head structures on opposite sides of UV-irradiated X. laevis embryos. There appear to be fundamental differences in the responses of E. coqui and X. laevis embryos to exogenous noggin RNA. We propose that these differences stem from an alteration in cytoplasmic arrangements that occurred during evolution of this large egg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008184
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    Paper (German National Licenses)
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  • 2
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    Age model and stable isotope record of eastern equatorial Pacific sediment cores (2003)
    PANGAEA
    In:  Supplement to: Martinez, Ignacio; Keigwin, Lloyd D; Barrows, Timothy T; Yokoyama, Yusuke; Southon, John (2003): La Niña-like conditions in the eastern equatorial Pacific and a stronger Choco jet in the northern Andes during the last glaciation. Paleoceanography, 18(2), 1033, https://doi.org/10.1029/2002PA000877
    Details
    Publication Date: 2024-01-25
    Description: Six deep sea cores from the eastern equatorial Pacific (EEP) were analyzed for planktonic foraminifera and stable isotopes in order to reconstruct sea surface temperatures (SST) for the last 40 ka. South of the Equatorial Front the abundance of Globorotalia inflata increased, and SST decreased by 〉5°C (core ODP846B), creating a stronger SST meridional gradient and advection of the Peru Current than present for the ~16-35 ka interval. A sharper SST meridional gradient forced stronger Choco jet events and a moisture increase in western Colombia, which supplied, through the San Juan River and the south-flowing equatorial and the Peru-Chile countercurrents, abundant hemipelagic quartz over the northern Peru basin (core TR163-31B). The Choco jet, and its associated mesoscale convective cells, provoked an increase in snow precipitation over the Central Cordillera of Colombia and the advance of the Murillo glacier. In synchrony with the intensified Choco jet events, the "dry island" effect over the Eastern Cordillera of Colombia intensified, and the level of Fuquene Lake dropped.
    Keywords: Deep Sea Drilling Project; DSDP; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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