1000 resultados para 32-306


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Vorbesitzer: Karmeliterkloster Frankfurt am Main

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Vorbesitzer: Mendel; Nathan Adler; Aaron Ben-Moses Fuld

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Vorbesitzer: Bartholomaeusstift Frankfurt am Main

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Boberach: Familienfideikommisse sind aufzuheben, weil ihren Besitzern für eine moderne Landwirtschaft das Kapital fehlt

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Welsch (Projektbearbeiter): Verurteilung des steirischen Landtagsabgeordneten von Emperger, des Schriftstellers und ehemaligen Redakteurs Schumacher, des Offiziers und Reisenden von Callot, des Handelsagenten Ribarz sowie des Militär-Rechnungsrats Zwettler zu achtzehn, zehn, sieben, zwei und drei Jahren schwerem Kerker resp. wegen Aufruhrs und Widerstands gegen das Militär

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Welsch (Projektbearbeiter): Österreichische Truppen unter General Haynau erobern gegen heftigsten Widerstand der Bewohner die Stadt Brescia (30. März bis 1. April 1849). Vereitelung eines ungarischen Ausbruchsversuches aus der belagerten Festung Peterwardein (1. April 1849); österreichische Besetzung von Mortara und Novara (21. und 24. März 1849)

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Aims Reintroduction has become an important tool for the management of endangered plant species. We tested the little-explored effects of small-scale environmental variation, genotypic composition (i.e. identity of genotypes), and genotypic diversity on the population survival of the regionally rare clonal plant Ranunculus reptans. For this species of periodically inundated lakeshores genetic differentiation had been reported between populations and between short-flooded and long-flooded microsites within populations.Methods We established 306 experimental test populations at a previously unoccupied lake shore, comprising either monocultures of 32 genotypes, mixtures of genotypes within populations or mixtures of genotypes between populations. In 2000, three years after planting out at the experimental site, a long-lasting flood caused the death of half of the experimental populations. In 2003, an extreme drought resulted in the lowest summer water levels ever measured.Important findings Despite these climatic extremes, 27 of the established populations survived until the end of the experiment in December 2003. The success of experimental populations largely differed between microsites. Moreover, the success of genotype monocultures depended on genotype and source population. Genetic differentiation between microsites played a minor role for the success of reintroduction. After the flood, populations planted with genotypes from different source populations increased in abundance, whereas populations with genotypes from single source populations and genotype monocultures decreased. We conclude that sources for reintroductions need to be selected carefully. Moreover, mixtures of plants from different populations appear to be the best choice for successful reintroduction, at least in unpredictably varying environments.

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Grand Canonical Monte Carlo simulations are used to reproduce the N₂/CO ratio ranging between 1.7 x 10⁻³ and 1.6 x 10⁻² observed in situ in the Jupiter-family comet 67 P/Churyumov-Gerasimenko (67 P) by the ROSINA mass spectrometer on board the Rosetta spacecraft. By assuming that this body has been agglomerated from clathrates in the protosolar nebula (PSN), simulations are developed using elaborated interatomic potentials for investigating the temperature dependence of the trapping within a multiple-guest clathrate formed from a gas mixture of CO and N₂ in proportions corresponding to those expected for the PSN. By assuming that 67 P agglomerated from clathrates, our calculations suggest the cometary grains must have been formed at temperatures ranging between ~ 31.8 and 69.9 K in the PSN to match the N₂/CO ratio measured by the ROSINA mass spectrometer. The presence of clathrates in Jupiter-family comets could then explain the potential N₂ depletion (factor of up to ~ 87 compared to the protosolar value) measured in 67 P/Churyumov-Gerasimenko.

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M. Nemirowski