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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 10 (1964), S. 257-262 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. In der unteren Elbe zwischen Schnackenburg und der Störmündung wurden während des kalten Winters 1962/63 ungewöhnlich hohe Gesamtkeimzahlen gefunden, die besonders im Februar die bisher in über 7jähriger Untersuchungszeit gewonnenen Maximalwerte um ein Mehrfaches übertrafen. 2. Unter der Eisdecke fand im Fluß eine lebhafte bakterielle Nitratreduktion (Denitrifikation) statt, die einen sehr starken Rückgang des NO3- und eine kräftige Zunahme des NO2-Gehaltes im Elbwasser zur Folge hatte. 3. Die Ursache der extrem hohen Gesamtkeimzahlen dürfte vor allem in dem Zusammentreffen von geringer Wasserführung der Elbe und anhaltend niedriger Temperatur liegen. Die starke Denitrifikation ist in erster Linie auf den durch die Eisdecke bedingten Sauerstoffmangel im Flußwasser zurückzuführen.
    Notes: Abstract Counts of total bacteria showed an unusually high increase in the river Elbe during the cold winter of 1962/63. Especially in February the number of bacteria was repeatedly higher than the maximum values measured during the whole 7-year period of investigation. A significant reduction of nitrate (denitrification) occurred beneath the ice-cover of the river. This caused a high increase of the NO2-concentration of the water, as well as a great decrease of the NO3-concentration. The extremely high bacteria counts were caused by the coincidence of an unusually small water transport and low temperature. The intensive denitrification results from oxygen deficiency in the water beneath the river's ice cover.
    Type of Medium: Electronic Resource
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  • 12
    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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  • 13
    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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  • 14
    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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  • 15
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    Unknown
    Wiley
    In:  Internationale Revue der gesamten Hydrobiologie und Hydrographie, 79 (4). pp. 605-619.
    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
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  • 16
    Publication Date: 2019-09-23
    Type: Article , NonPeerReviewed
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  • 17
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    Unknown
    In:  (Professorial dissertation), Universität Hamburg, Hamburg, 115 pp
    Publication Date: 2021-01-25
    Type: Thesis , NonPeerReviewed
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  • 18
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    Unknown
    G. Fischer
    In:  G. Fischer, Jena u.a., 294 pp. 5. ISBN 3-334-00400-7
    Publication Date: 2014-05-14
    Type: Book , NonPeerReviewed
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  • 19
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    Unknown
    Institut für Ökologie, Hiddensee
    In:  Bodden, 1 . pp. 31-49.
    Publication Date: 2018-08-17
    Type: Article , NonPeerReviewed
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  • 20
    Publication Date: 2022-04-07
    Description: Währcnd des in Norddeutschland ungewöhnlich kalten Winters 1962/63 trug die Elbe oberhalb von Hamburg mehrere Wochen lang eine 40-50 cm dicke Eisdecke, unterhalb der Stadt herrschte in dieser Zeit ständiges Eistreiben. Im Rahmen einer mehrjährigen mikrobiologischen Untersuchung wurde der Einfluß der anhaltenden Eisbedeckung auf das Bakterienleben im Strom studiert. Es zeigte sich, daß der Bakteriengehalt des Flullwassers wesentlich stärker als in normalen Wintern anstieg. Er belief sich besonders in dem Abschnitt oberhalb von Hamburg bei allen Stationen auf ein Mehrfaches der in der gesamten etwa 8 jährigen Untersuchungszeit vorher und nachher gewonnenen Maximalwerte. Die Ursache hierfür dürfte in erster Linie in dem Zusammentreffen von sehr geringer Wasserführung und anhaltend niedriger Temperatur liegen. Unter der Eisdecke kam es zu einer starken, vor allem von Mikroorganismen bewirkten Sauerstoffzehrung. Bedingt durch die anaeroben Verhältnisse erfolgte im Fluß eine lebhafte bakterielle Nitratreduktion (Denitrifikation). Diese wurde durch den kräftigen Rückgang des Nitratgehalts deutlich, der zunächst von einem starken Nitritanstieg begleitet wurde. Da die Nitratrcduktion über Nitrit bis zum freien Stickstoff führte, fand sich im Februar 1963 bei den meisten Stationen anorganisch gebundener Stickstoff fast nur noch in Form von Ammoniak. Laborversuche bestätigten, daß auch bei winterlichen Wassertemperaturen die Bakterientätigkeit noch stark genug ist, um den gesamten Sauerstoff in 02-gesättigtem Elbwasser innerhalb von 1 Woche zu verbrauchen. Das in der Elbe befindliche Nitrat kann dann ebenfalls in wenigen Tagen durch denitrifizierende Bakterien völlig über Nitrit zu freiem Stickstoff reduziert werden.
    Type: Article , NonPeerReviewed
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