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  • 1
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    Degradation of p-nitrophenol by natural microbial communities from the estuary of the river Elbe (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-03
    Description: The test compound p-nitrophenol during summer normally is rapidly degraded in the freshwater area of the Elbe river. In contrast, degradation of PNP is decreased significantly during periods of low temperature or low oxygen content. Thus the xenobiotic compound is carried to the North Sea. In estuarine and marine environments the degradation of PNP is diminished step by step towards the open sea and is finally ceased completely, mostly as a result of increasing salinity.
    Type: Article , NonPeerReviewed
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  • 2
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    A synoptic survey on bacterial numbers, biomass and activity along the middle line of the Baltic Sea (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-03
    Description: Between 28 August and 5 September 1982 thirty water samples (5 m depth) were taken on a transect between the Bothnian Bay and the Kiel Bight. Despite substantially differing hydrographical situations within the different subregions of the Baltic Sea, the total bacterial numbers showed a remarkable regional uniformity. Bacterial numbers fluctuated between 3 and 4 x 106 cells ml-1. A distinct pattern was observed: mean bacterial cell volumes were high in the Bothnian Bay (0.145 µm3) and low in the Gotland- and Bornholm Sea (0.094 and 0.091 µm3, respectively). The bacterial biomass fell in the range of 184 - 117 µg C 1-1. The activity parameters were somewhat more variable than bacterial numbers and biomass.
    Type: Article , NonPeerReviewed
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  • 3
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    Factors influencing the acclimation period preceding the mineralization of organic chemicals by microbial communities (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-13
    Description: An acclimated mixed culture of degrading bacteria and a degradable substance (4-Nitrophenol) were introduced into differently treated water samples. It could be shown that in all cases where an acclimated inoculum was used, degradation took place almost immediately compared to not acclimated cultures, where it took at least 10 days. The rate and extent of mineralization was influenced by low temperature, the presence of other organic nutrients and especially protozoan grazing. The data suggest that one of the main reasons for the acclimation period was the very small initial population of degrading bacteria. The role of other carbon sources is ambivalent. Low concentrations of organic chemicals which cannot sustain growth slow down acclimation and the degradation rate. Another important factor slowing down growth is grazing by protozoa, which can inhibit effective degradation.
    Type: Article , NonPeerReviewed
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  • 4
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    The Use of Bacteriological Variables for the Characterization of Different Water Bodies (1994)
    Wiley
    In:  Internationale Revue der gesamten Hydrobiologie und Hydrographie, 79 (4). pp. 605-619.
    Details
    Publication Date: 2018-06-19
    Description: Studies on the Mediterranean Undercurrent in the Gulf of Cádiz showed that bacterial abundance and biomass as well as heterotrophic activity were higher in the water of Mediterranean origin in 500–800 m depth than in the adjacent Atlantic water. Upwelling processes off Mauretania and Portugal were accompanied by high bacterial numbers (bacterial plate counts) in the mixed surface layer. Changes in the qualitative composition of the bacterial flora in the waters off West Africa and in the Arabian Gulf were explained by the introduction of dust from desert regions into the sea by aeolian transport. In the Western Baltic migration of fish was detected by the presence of special bacteria, which normally live on or in these animals. Regions with complex hydrographic structures such as the Western and Central Baltic Sea revealed interesting relationships between bacteriological abundance and activity on the one hand and characteristic physical and chemical properties, such as origin, salinity and O2/H2S‐content, on the other. The importance of bacteriological variables for the characterization of different water bodies is discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/iroh.19940790410
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  • 5
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    Ökologische Untersuchungen zur Nitrifikation in Nord-und Ostsee (1967)
    Biologische Anstalt Helgoland
    In:  Helgoländer Wissenschaftliche Meeresuntersuchungen, 15 (1-4). pp. 243-252.
    Details
    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
    DOI: 10.1007/BF01618627
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  • 6
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    Auswertung von bakteriologischen Untersuchungen bei zwei Stationen der Elbe oberhalb von Hamburg (1991)
    In:  Wasser und Abwasser, 35 . pp. 93-108.
    Details
    Publication Date: 2019-09-23
    Type: Article , NonPeerReviewed
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  • 7
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    Mikrobiologie der Gewässer (1991)
    G. Fischer
    In:  G. Fischer, Jena u.a., 294 pp. 5. ISBN 3-334-00400-7
    Details
    Publication Date: 2014-05-14
    Type: Book , NonPeerReviewed
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  • 8
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    Eutrophierung der Schlei - Vergangenheit und Gegenwart - (1994)
    Institut für Ökologie, Hiddensee
    In:  Bodden, 1 . pp. 31-49.
    Details
    Publication Date: 2018-08-17
    Type: Article , NonPeerReviewed
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  • 9
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    Über einige sternbildende Bakterien aus der Ostsee (1967)
    Institut für Meereskunde
    Details
    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
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  • 10
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    Elektronenoptische Untersuchungen über sternbildende Bakterien aus der Ostsee (1967)
    Institut für Meereskunde
    Details
    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
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