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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
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 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
    Format: text
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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
    Format: text
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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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    Fahrtbericht über die 92. Forschungsreise von F.S. "Poseidon" [POS92] vom 16. August bis 5. September 1982 - Mikrobiologische und chemische Untersuchungen in der Ostsee" (1982)
    In:  UNSPECIFIED, Kiel, 7 pp.
    Details
    Publication Date: 2015-07-21
    Type: Report , NonPeerReviewed
    Format: text
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    OceanRep: Report - Cruise Report
  • 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
    Format: text
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  • 7
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    Fahrtleiterbericht über die 74. Forschungsreise von F.S. "Poseidon" [POS74] vom 24. April bis 22. Mai 1981 - Mikrobiologische Untersuchungen in der Biskaya und vor der portugiesischen Küste (1981)
    Institut für Meereskunde
    In:  Institut für Meereskunde, Kiel, 8 pp.
    Details
    Publication Date: 2015-07-20
    Type: Report , NonPeerReviewed
    Format: text
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    OceanRep: Report - Cruise Report
  • 8
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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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    OceanRep: Book
  • 9
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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
    Format: text
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  • 10
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    Investigations on the role of bacteria in the food web of the Western Baltic (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-25
    Description: Scientists of the Institut für Meereskunde at the University of Kiel have for several years been involved in investigations into the role of carbon heterotrophic microorganisms in the food web of the western Baltic. The aim of this work is to obtain information on the transformation of organic material from the primary producers to bacteria and from these to zooplankton and zoobenthos during the annual cycle. The release of phytoplankton exudates was investigated by use of tracer methods and by the uptake of this material by bacteria. lt could be shown that in the Kiel Bight area approximately 15- 30 % of the yearly primary production was transformed to bacterial biomass. In relation to the phytoplankton development the bacteria population exhibits seasonal changes. The growth of aufwuchs was studied and also the sedimentation of algal detritus. During sedimentation a rather high amount of the easily degradable material is remineralized. The remineralization processes are strongly affected by temperature. Laboratory experiments showed that 35 % of the phytoplankton material was remineralized at 20 °C and 3 % at 5 °C per day. The bacterial aufwuchs is a valuable subtrate for grazing organisms like ciliates and rotifers. These processes continue after sedimentation of the detritus and stimulate bacterial activity in the uppermost zone of the ground. The amount of bacterial biomass production influences the development of the meiofauna. In shallow coastal waters microphytobenthos can provide most of the primary carbon production from which about 50 % were transferred to bacterial biomass.
    Type: Article , NonPeerReviewed
    Format: text
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