381 research outputs found

    Bibliography of the entomological literature, series I : from the beginning until 1863 (Index novus litteraturae entomologicae, Serie I: usque ad 1863)

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    Für Taxonomen gehören alle Publikationen, die nach 1758 erschienen sind, in die Rubrik „aktuelle Literatur“. Es gibt bereits mehrere Bibliographien, die versucht haben, die entomologischen Publikationen für den Zeitraum bis 1863 systematisch zu erfassen. Das Jahr 1863 bildet insofern eine Besonderheit, da nach 1863 mit dem „Zoological Record“ ein Werk existiert, das wesentliche bibliographische Bedürfnisse für die Entomologie abdeckt. Für den Zeitraum von 1864 bis 1900 gibt es zusätzlich die Serie II des „Index“ (Derksen & Scheiding 1963 – 1975). Eine taxonbezogene Literaturauswertung bis 1850 findet sich im herausragenden „Index Animalium“ (Sherborn, 1902, 1922-33).The „Index novus“ will contain about 44000 references with entomological content. The improvements made since the previous edition „Index litteraturae entomologicae“, and some of the problems which arose during preparation of the new work are explained

    Effects of dietary vitamin E from rapeseed oil on gene expression in brain and liver of rats

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    This thesis addresses the influence of depletion as well as supplementation of natural-source vitamin E on redox status and the expression of Alzheimer's disease relevant genes in the brain and the expression of microRNA in the liver of laboratory rats.Im Rahmen der vorliegenden Doktorarbeit wurden der Einfluss der Depletion sowie der Supplementierung von natĂĽrlichem Vitamin E auf den Redox-Status und die Expression von Genen mit Bedeutung bei Morbus Alzheimer im Gehirn sowie die Expression von microRNS in der Leber der Laborratte untersucht

    Late Cenozoic submarine slope failures in the southern North Sea - Evolution and controlling factors

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    During the Late Miocene to early Pleistocene sedimentation in the southern North Sea Basin was dominated by a westward prograding depositional system. Progradation is evidenced by a series of large-scale, westward dipping clinoforms with amplitudes of up to 400 m. The clinoforms are related to a shelf-slope-basin physiography during deposition and their development and growth reflects the basinward migration of the Late Cenozoic shelf margin through time. Numerous submarine slope failures occurred on the shelf margin during this time, recognized as kilometer-scale mass-transport deposits (MTDs). Comparatively little is known about the earliest slope failures on this prograding shelf margin, yet their role is important in developing a coherent understanding of the origins of the instability of the margin as a whole. In this study we present detailed analyses of the first MTDs occurring on this Late Cenozoic shelf margin. Based on interpretation of 2D seismic reflection profiles, borehole data and integration of new chronostratigraphic datings the development and causes of slope instabilities are reconstructed. Three MTDs are distinguished within the German part of the southern North Sea, one (MTD1) that has been displaced in the Late Tortonian and two (MTD 2/3) in the Piacenzian. MTD 1 was triggered by salt-induced seismicity, as evident from salt-related faulting of the Late Cenozoic succession in its headwall domain. Pore pressure build up due to fluid migration from deeper levels in combination with loading imposed to the basin by the prograding shelf prism are the main factors controlling the initiation of MTDs 2 and 3.Subsequent slope failures occurring during shelf progradation within the Dutch North Sea are much more frequent compared to the earliest slope failures. The development from a relatively stable shelf margin towards a margin affected by repeated slope failures coincides approximately with the intensification of Northern Hemisphere Glaciations during Pleistocene times. The development and deposition of the MTDs in the Dutch North Sea is clearly linked to climate-driven environmental changes, whereas prior to the Pleistocene failure mechanisms are preferably limited to those independent of glaciations and associated sea level changes and therefore fewer failures have occurred

    Late Cenozoic submarine slope failures in the southern North Sea - Evolution and controlling factors

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    During the Late Miocene to early Pleistocene sedimentation in the southern North Sea Basin was dominated by a westward prograding depositional system. Progradation is evidenced by a series of large-scale, westward dipping clinoforms with amplitudes of up to 400 m. The clinoforms are related to a shelf-slope-basin physiography during deposition and their development and growth reflects the basinward migration of the Late Cenozoic shelf margin through time. Numerous submarine slope failures occurred on the shelf margin during this time, recognized as kilometer-scale mass-transport deposits (MTDs). Comparatively little is known about the earliest slope failures on this prograding shelf margin, yet their role is important in developing a coherent understanding of the origins of the instability of the margin as a whole. In this study we present detailed analyses of the first MTDs occurring on this Late Cenozoic shelf margin. Based on interpretation of 2D seismic reflection profiles, borehole data and integration of new chronostratigraphic datings the development and causes of slope instabilities are reconstructed. Three MTDs are distinguished within the German part of the southern North Sea, one (MTD1) that has been displaced in the Late Tortonian and two (MTD 2/3) in the Piacenzian. MTD 1 was triggered by salt-induced seismicity, as evident from salt-related faulting of the Late Cenozoic succession in its headwall domain. Pore pressure build up due to fluid migration from deeper levels in combination with loading imposed to the basin by the prograding shelf prism are the main factors controlling the initiation of MTDs 2 and 3.Subsequent slope failures occurring during shelf progradation within the Dutch North Sea are much more frequent compared to the earliest slope failures. The development from a relatively stable shelf margin towards a margin affected by repeated slope failures coincides approximately with the intensification of Northern Hemisphere Glaciations during Pleistocene times. The development and deposition of the MTDs in the Dutch North Sea is clearly linked to climate-driven environmental changes, whereas prior to the Pleistocene failure mechanisms are preferably limited to those independent of glaciations and associated sea level changes and therefore fewer failures have occurred

    Neurokinin-immunoreactivity in human neuroblastomas Evidence for selective expression of the preprotachykinin (PPT) II gene

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    AbstractFactors regulating differentiation of the peripheral nervous system (PNS) have been widely studied in neuroblastomas which are tumors of the PNS. Five neuroblastomas were investigated for their content of tachykinin neuropeptides, which arise from two distinct genes which appear differentially expressed in the PNS. Radioimmunoassay and column chromatography revealed large amounts of neurokinin B in three of these tumors and the absence of substance P, neurokinin A, neuropeptide K and neuropeptide Îł from all five tumors. This suggests that neuroblastomas can selectively express the preprotachykinin (PPT) II gene and that they may be valuable for investigating the factors involved in the regulation of these two structurally-related neuropeptide genes

    The Mesozoic-Cenozoic tectonic evolution of the New Siberian Islands, NE Russia

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    On the New Siberian Islands the rocks of the east Russian Arctic shelf are exposed and allow an assessment of the structural evolution of the region. Tectonic fabrics provide evidence of three palaeo-shortening directions (NE–SW, WNW–ESE and NNW–SSE to NNE–SSW) and one set of palaeo-extension directions revealed a NE–SW to NNE–SSW direction. The contractional deformation is most likely the expression of the Cretaceous formation of the South Anyui fold–thrust belt. The NE–SW shortening is the most prominent tectonic phase in the study area. The WNW–ESE and NNW–SSE to NNE–SSW-oriented palaeo-shortening directions are also most likely related to fold belt formation; the latter might also have resulted from a bend in the suture zone. The younger Cenozoic NE–SW to NNE–SSW extensional direction is interpreted as a consequence of rifting in the Laptev Sea
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