980 resultados para Dahlmann, F. C. (Friedrich Christoph), 1785-1860.


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Fused in sarcoma (FUS) is a ubiquitously expressed RNA-binding protein proposed to function in various RNA metabolic pathways, including transcription regulation, pre-mRNA splicing, RNA transport and microRNA processing. Mutations in the FUS gene were identified in patients with amyotrophic lateral sclerosis (ALS), but the pathomechanisms by which these mutations cause ALS are not known. Here, we show that FUS interacts with the minor spliceosome constituent U11 snRNP, binds preferentially to minor introns and directly regulates their removal. Furthermore, a FUS knockout in neuroblastoma cells strongly disturbs the splicing of minor intron-containing mRNAs, among them mRNAs required for action potential transmission and for functional spinal motor units. Moreover, an ALS-associated FUS mutant that forms cytoplasmic aggregates inhibits splicing of minor introns by trapping U11 and U12 snRNAs in these aggregates. Collectively, our findings suggest a possible pathomechanism for ALS in which mutated FUS inhibits correct splicing of minor introns in mRNAs encoding proteins required for motor neuron survival.

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During the latest Cretaceous cooling phase, a positive shift in benthic foraminiferal d18O values lasting about 1.5 Myr (71.5-70 Ma) can be observed at a global scale (Campanian-Maastrichtian Boundary Event, CMBE). This d18O excursion is interpreted as being influenced by a change in intermediate- to deep-water circulation or by temporal build-up of Antarctic ice sheets. Here we test whether benthic foraminiferal assemblages from a southern high-latitudinal site near Antarctica (ODP Site 690) are influenced by the CMBE. If the d18O transition reflects a change in intermediate- to deep-water circulation from low-latitude to high-latitude water masses, then this change would result in cooler temperatures, higher oxygen concentration, and possibly lower organic-matter flux at the seafloor, resulting in a major benthic foraminiferal assemblage change. If, however, the d18O transition was mainly triggered by ice formation, no considerable compositional difference in benthic foraminiferal assemblages would be expected. Our data show a separation of the studied succession into two parts with distinctly different benthic foraminiferal assemblages. Species dominating the older part (73.0-70.5 Ma) tolerate less bottom water oxygenation and are typical components of low-latitude assemblages. In contrast, the younger part (70.0-68.0 Ma) is characterized by species that indicate well-oxygenated bottom waters and species common in high-latitude assemblages. We interpret the observed change in benthic foraminiferal assemblages toward a well-oxygenated environment to reflect the onset of a shift from low-latitude toward high-latitude dominated intermediate- to deep-water sources. This implies that a change in oceanic circulation was at least a major component of the CMBE.

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Contents of each report may be found in "List of publications of the Geological survey of Canada. 1906."

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The fons primarius of Plutarch's life of Fabius Maximus. -- The common Greek sources of Plutarch and Appianus for Roman history. -- King Juba's Historia romana.

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Vol. 11: Neu bearb. von Brandes, Gmelin, Horner, Littrow, Muncke, Pfaff ... Sach- und namen-register mit ergänzenden zusätzen von G. W. Muncke ... Nebst nachträgen zum Verzeichniss geographischer ortsbestimmungen von C. L. v. Littrow.

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Mode of access: Internet.

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"Aus dem Archiv fr Geschichte und Literatur von Fr. Chr. Schlosser und G. A. Bercht."

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v.1: 4th ed., 1848; v.2: 3d ed., 1838; v.3: 3d ed., 1840; v.4: 2d ed., 1846; v.5: 1836; v.6: 1840.

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Mode of access: Internet.

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Includes bibliographical references.

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Kirchner, J. Bibliographie der Zeitschriften des deutschen Sprachgebietes bis 1900

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Mode of access: Internet.

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Includes bibliographical references.