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  • 1975-1979
  • 1965-1969  (5)
  • 1967  (5)
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  • 1975-1979
  • 1965-1969  (5)
Year
  • 1
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (165 Seiten, 12 MB) , Illustrationen, Diagramme, Karten
    Language: German
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 15 (1967), S. 243-252 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Seit November 1964 werden in regelmäßiger Folge Bestimmungen des Ammoniak-, Nitrit- und Nitratgehaltes bei verschiedenen Stationen der Kieler Bucht vorgenommen. Es zeigte sich ein deutlicher Jahresgang mit ausgeprägten Nitrit- und Nitratmaxima in der Zeit von Anfang Februar bis Anfang März. 2. Der kräftige Nitratanstieg während des Winters ist — ebenso wie der schwächere sommerliche NO 3 − -Anstieg — auf die Oxydation von Ammoniak über Nitrit zu Nitrat zurückzuführen. Diese wird im wesentlichen durch Bakterien bewirkt. 3. Dementsprechend konnten im ganzen Bereich der Kieler Bucht und im Seegebiet um Helgoland — sowohl im Wasser als auch in den Sedimenten — chemoautotrophe Nitrit- und Nitratbakterien nachgewiesen werden, die unter den dort gegebenen Salinitätsverhältnissen auch zur Oxydation von Ammoniak beziehungsweise Nitrit in der Lage sind.
    Notes: Abstract Ammonia, nitrite and nitrate were regularly estimated at several stations in the Kieler Bucht (western Baltic Sea) since November 1964. There are considerable seasonal changes in the contents of these 3 nitrogen compounds with impressive maxima of nitrite and nitrate in February or at the beginning of March. The great increase of nitrite and nitrate during the winter and also a smaller increase in summer are mainly caused by oxidation of ammonia, first to nitrite and then to nitrate, by nitrifying bacteria. In consequence chemoautotrophic nitrite- and nitratebacteria could be found in the water as well as in sediments all over the Kieler Bucht and also in the North Sea around the isle of Helgoland. These nitrifying bacteria are able to oxidize ammonia or nitrite in salinity conditions typical for the western Baltic Sea and the North Sea.
    Type of Medium: Electronic Resource
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  • 3
    facet.materialart.
    Unknown
    Biologische Anstalt Helgoland
    In:  Helgoländer Wissenschaftliche Meeresuntersuchungen, 15 (1-4). pp. 243-252.
    Publication Date: 2019-01-21
    Description: Ammonia, nitrite and nitrate were regularly estimated at several stations in the Kieler Bucht (western Baltic Sea) since November 1964. There are considerable seasonal changes in the contents of these 3 nitrogen compounds with impressive maxima of nitrite and nitrate in February or at the beginning of March. The great increase of nitrite and nitrate during the winter and also a smaller increase in summer are mainly caused by oxidation of ammonia, first to nitrite and then to nitrate, by nitrifying bacteria. In consequence chemoautotrophic nitrite- and nitratebacteria could be found in the water as well as in sediments all over the Kieler Bucht and also in the North Sea around the isle of Helgoland. These nitrifying bacteria are able to oxidize ammonia or nitrite in salinity conditions typical for the western Baltic Sea and the North Sea.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    facet.materialart.
    Unknown
    Institut für Meereskunde
    Publication Date: 2022-04-21
    Description: Es werden vier sternbildende Bakterienstämme aus der westlichen Ostsee beschrieben und Beobachtungen über die Ausbildung der sternförmigen Zellaggregate mitgeteilt. Ein Stamm wird zu Agrobacterium stellulatum STAPP und KNÖSEL gestellt, die drei anderen werden als eigene Arten abgegrenzt und dafür die Namen Agrobacterium ferrugineum nov. spec., Agrobacterium luteum nov. spec. und Agrobacterium sanguineum nov. spec. vorgeschlagen. Four bacterial strains forming starlike aggregates were isolated from waters of the Western Baltic Sea. They were studied morphologically and physiologically, with special emphasis on the aggregate formation. A description of each strain is given. One belongs to Agrobacterium stellulatum STAPP and KNÖSEL. For three further strains the following names are proposed: Agrobacterium ferrugineum nov. spec., Agrobacterium luteum nov. spec. and Agrobacterium sanguineum nov. spec.
    Type: Article , NonPeerReviewed
    Format: text
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  • 5
    Publication Date: 2022-04-22
    Description: Die Sternbildung von drei Agrobacterium-Arten aus der Ostsee wurde anhand von bedampften und unbedampften Präparaten und von Ultradünnschnitten elektronenoptisch untersucht. Bei allen drei Arten wurde eine Haftsubstanz nachgewiesen, an der sich die Zellen mit ihren Polen festheften. Sie wird von den Zellpolen abgeschieden. Die Sternzellen waren stets von einer deutlichen Zellwand begrenzt. Anhaltspunkte for eine Zell- oder Kernverschmelzung im Sternzentrum konnten nicht gefunden werden. Es bestand keine eindeutige Tendenz zur Verlagerung der DNS in den zentralen Pol. Agrobacterium luteum besitzt polare Fimbrien, die offenbar für die Entstehung der Sterne wichtig sind. Im Zentrum der Rosetten befinden sich runde Granula von einheitlichem Aufbau. Sie werden in bedampften Präparaten ganzer Zellen und in Ultradünnschnitten abgebildet. Ihre Bedeutung wird diskutiert. The star formation of three species of Agrobacterium from the Baltic Sea was examined by electron microscopy of shadowed and unshadowed preparations. In all three species a holdfast material was found to exist, to which the cells are attached by means of their poles. This holdfast material is a secretion of the cell poles. The individual cells of the stars were in all cases limited by a distinct cell -wall. There was no indication of a fusion of the cells or the nuclei in the centre of the stars. Nor was any definite tendency found for the DNA to gather at the central pole. Agrobacterium luteum has polar fimbriae, which appear to be important for the formation of the stars. In the centre of the rosettes round granules of equal structure are to be found. They are demonstrated in shadowed preparations of whole cells and in ultrathin sections. Their importance is discussed.
    Type: Article , NonPeerReviewed
    Format: text
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