963 resultados para 88-581


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Samuel Klein

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Vorbesitzer: Dominikanerkloster Frankfurt am Main

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veröffentlicht in: Schopenhauer, Arthur : Arthur Schopenhauers sämtliche Werke - München : Piper - Bd. 14 : Der Briefwechsel Arthur Schopenhauers ; 1 (1799 - 1849), Nr. 18;

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Vorbesitzer: Oswaldus, Pleban in Ostheim (Vorbesitzer?), Karmeliterkloster Frankfurt am Main

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1 Brief von Edith Kriss an Margot von Mendelssohn, 13.10.1943; 1 Brief von Margot von Mendelssohn an Max Horkheimer, 23.01.1944; 1 Brief von Max Horkheimer an Henryk Grossman, 10.04.1944; 1 Brief von Nevitt Sanford an Max Horkheimer, 21.01.1944; 2 Briefe zwischen Richard C. Rothschild und Frederick Pollock, 1944; 1 Brief von Frederick Pollock an das Registrar for Voting in New York Country, [1944]; 1 Brief von Theodor W. Adorno an Frederick Pollock, 07.06.1944;

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Bittbrief, Persönliche Nachrichten, Johann Albrecht Vogtherr, Seydewitz, Prüning, Leopold Sonnemann, Carl Holthof, Oppel, Miquel

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Vorbesitzer: Johannes Bartholomaei

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The ice cover of the Arctic Ocean has been changing dramatically in the last decades and the consequences for the sea-ice associated ecosystem remain difficult to assess. Algal aggregates underneath sea ice have been described sporadically but the frequency and distribution of their occurrence is not well quantified. We used upward looking images obtained by a remotely operated vehicle (ROV) to derive estimates of ice algal aggregate biomass and to investigate their spatial distribution. During the IceArc expedition (ARK-XXVII/3) of RV Polarstern in late summer 2012, different types of algal aggregates were observed floating underneath various ice types in the Central Arctic basins. Our results show that the floe scale distribution of algal aggregates in late summer is very patchy and determined by the topography of the ice underside, with aggregates collecting in dome shaped structures and at the edges of pressure ridges. The buoyancy of the aggregates was also evident from analysis of the aggregate size distribution. Different approaches used to estimate aggregate biomass yield a wide range of results. This highlights that special care must be taken when upscaling observations and comparing results from surveys conducted using different methods or on different spatial scales.