926 resultados para light and electron microscopy
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The European Commission’s Action Plan consists, in a nutshell, of a short list of technical proposals and a longer one of (rather general) potential actions. Overall, the plan indeed proposes to achieve some short-term objectives, such as a reduction of listing costs for SMEs, but it lacks long-term vision. The plan bundles actions under rather generic objectives of long-term finance or cross-border investing. Improving the informational infrastructure (e.g. accounting standards, company data) and cross-border enforcement of rules is left to vaguely defined future actions, but these constitute the core of the capital markets infrastructure. Without a well-defined set of measurable objectives, the whole plan may lose political momentum and become an opportunity for interested parties to cherry pick their pet provisions. Building a single market, i.e. removing cross-border obstacles to capital circulation, is too challenging a task to simply appear as one of many items on a long list of general objectives, which incidentally do not include institutional reform. The ultimate risk is that the Commission may just miss a unique opportunity to revamp and improve the financial integration process in Europe after almost a decade of harmful financial retrenchment.
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Previous workers identified a magnetically anomalous clay layer deposited on the northern United States Atlantic Coastal Plain during the Paleocene-Eocene thermal maximum (PETM). The finding inspired the highly controversial hypothesis that a cometary impact triggered the PETM. Here we present ferromagnetic resonance (FMR), isothermal and anhysteretic remanent magnetization, first-order reversal curve, and transmission electron microscopy analyses of late Paleocene and early Eocene sediments in drill core from Ancora, New Jersey. A novel paleogeographic analysis applying a recent paleomagnetic pole from the Faeroe Islands indicates that New Jersey during the initial Eocene had a ~6°-9° lower paleolatitude (~27.3° for Ancora) and a more zonal shoreline trace than in conventional reconstructions. Our investigations of the PETM clay from Ancora reveal abundant magnetite nanoparticles bearing signature traits of crystals produced by magnetotactic bacteria. This result, the first identification of ancient biogenic magnetite using FMR, argues that the anomalous magnetic properties of the PETM sediments are not produced by an impact. They instead reflect environmental changes along the eastern margin of North America during the PETM that led to enhanced production and/or preservation of magnetofossils.
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Mode of access: Internet.
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"OR91-504"--P. [4] of cover.
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Includes bibliographical footnotes and index.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.