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  • Other Sources  (14)
  • Institut für Meereskunde  (14)
  • 2000-2004
  • 1990-1994  (14)
  • 1970-1974
  • 1
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    Resistance to cadmium in a marine bacterium (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-03
    Type: Article , NonPeerReviewed
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  • 2
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    Fecal coliform accumulation and depuration in the oyster Crassostrea gigas (1991)
    Institut für Meereskunde
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    Publication Date: 2022-06-03
    Description: Experiments on fecal coliform accumulation and depuration in the oyster Crassostrea gigas were performed under two seasons (winter, summer), under various conditions of bacterial concentration (from 101 to 103 CFU ml-1) and suspended matter (10 to 50 mg l-1). Contamination process in the bivalve is mainly influenced by the bacterial density in the seawater. Influence of suspended matter concentration was less effective. Maximal bacterial accumulation was reached within 30 min. in summer (18 °C) and 5 hours in winter (11 °C). Concerning depuration process a 10 fold decrease of initial contamination required 3 hours and a 100 fold decrease was achieved within 10 hours. Time required for depuration was mainly dependent on the initial bacterial concentration in the oyster.
    Type: Article , NonPeerReviewed
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  • 3
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    Interactions within biofilms : the disruption of biofilm structure by protozoa (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-07
    Description: The structure of biofilms on various surfaces exposed in Spain, England and Denmark was examined. The majority of the surfaces examined were antifouling paints. At all times a wide variety of protozoan species were present. Typical forms included ciliates and choanoflagellates, attached to the surface of the paint or an adherent biofilm of bacteria and diatoms. Closer examination of many films indicated an abundance of amoeboid protozoa, that were able to move about within the biofilm. The staining and examination of sections of biofilms under the light microscope indicated that the amoeboid protozoa were distributed throughout the biofilm. These protozoa moved through the film grazing on the other organisms present and showed several different patterns of activity. Ultimately this caused the disruption and subsequent sloughing of the biofilm.
    Type: Article , NonPeerReviewed
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  • 4
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    Susceptibility to heavy metals and antibiotics of eight deep-sea hydrothermal vent bacteria carrying a 51.7 kb plasmid (1991)
    Institut für Meereskunde
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    Publication Date: 2022-06-07
    Description: Eight Pseudomonas-like bacteria isolated from the tube of the deep-sea hydrothermal vent Polychaete Alvinella pompejana were found to carry a 51.7 kb plasmid. All isolates but one were resistant to zinc (3 mM or more) and arsenate ions (200 mM or more). The strains were resistant to penicillin and chloramphenicol.
    Type: Article , NonPeerReviewed
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  • 5
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    Bacteria and their distribution under red-tide conditions (1991)
    Institut für Meereskunde
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    Publication Date: 2022-06-08
    Description: Survey of the density of red-tide organisms and bacterioplankton as well as simultaneous determinations of temperature, salinity, pH, secchi disc and dissolved oxygen were carried out at four stations in the Kaštela Bay (middle Adriatic Sea) on a weekly basis between June 15 and September 20, 1989. A close connection between bacterioplankton and Gonyaulax polyedra was observed during the bloom manifested by high coefficients of correlation between them in the surface layers. No correlation was established in the bottom layers since vertical gradients of bacterioplankton density were considerably weaker than in phytoplankton. These differences were also shown in strong vertical gradient of pH and 02-saturation.
    Type: Article , NonPeerReviewed
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  • 6
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    Availability of nutrients to a deep-sea benthic microbial community : results from a ship-board experiment (1991)
    Institut für Meereskunde
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    Publication Date: 2022-06-08
    Description: Intact sediment cores from the Vøring-Plateau (Norwegian Sea) were incubated under in situ temperature on board ship with and without the addition of natural detritus to follow the reaction of deep-sea benthic microbial communities to nutrient enrichment. Concentration and enzymatic decomposition of organic material, total microbial number, biomass and production were followed in timecourse experiments. The addition of decomposable organic material caused an immediate stimulation of microbial metabolic processes: following the induction of enzymatic activity, microbial biomass production increased. During the initial period of incubation metabolic processes were also stimulated in the untreated "control" sediments. This "incubation effect" competed with the "feeding effect" caused by the enrichment with organic material.
    Type: Article , NonPeerReviewed
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  • 7
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    Estimation of picoplankton (1991)
    Institut für Meereskunde
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    Publication Date: 2022-06-08
    Description: The method proposed for the measurement of the picoplankton density, uses epifluorescence microscopy, which allows the detection of all the cells with their own or/and induced fluorescence. Direct counts may lead to an overestimation of the viable counts since we cannot discriminate between living and dead cells. We appropriately modified the method of KOGURE et al. (1979) for the fraction of cells capable of division. This method is applied both to autofluorescent organisms and to all the cells stained by fluorochrome (DAPI). Direct counts are compared with those obtained from Marine Agar, a selective medium for marine heterotrophic bacteria. The results obtained in different Mediterranean areas allow us to realize how effective this method is in comparatively evaluating different planktonic dimensional fractions occurring in the marine ecosystem.
    Type: Article , NonPeerReviewed
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  • 8
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    Seasonal distribution and character of heterotrophic marine bacteria in the intertidal zone of the Yellow Sea near Kunsan, Korea (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-08
    Description: Annual distribution of heterotrophic marine bacteria and seasonal characteristics were investigated in the intertidal water and sediments of the Yellow Sea near Kunsan, Korea. The heterotrophic marine bacteria ranged from 7.5 x 102 to 1.1 x 105 CFU ml-1 in water and 1.62 x 104 to 4.78 x 106 CFU g-1 dry sediment. As for the morphological distribution measured by epifluorescence microscopy, rod-shaped bacteria were more than 74 % of all cells during the investigation period. Average biovolume of sampled bacteria ranged from 3.19 ± 0.59 x 10-2 to 6.19 ± O.76 x 10-2 µm3 for coccoid bacteria, and from 4.57 ± 0.17 x 10-2 to 12.94 ± 0.21 x 10-2 µm3 for rod-shaped ones. Isolated bacteria showed utilization of various carbon sources such as glucose, maltose, lactose, xylose and arabinose, and tolerance to a range of salinities. In total 82 strains were isolated from seawater and 114 strains from sediments. Dominant genera were Pseudomonas, Vibrio, Flavobacterium and Acinetobacter in seawater, and Pseudomonas, Acinetobacter, Vibrio and Mycobacterium in sediments.
    Type: Article , NonPeerReviewed
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  • 9
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    Fine-scale distribution of hydrolytic activity associated with foraminiferans and bacteria in deep-sea sediments of the Norwegian-Greenland Sea (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-08
    Description: Pronounced fine-scale gradients of enzymatic degradation of organic material were observed in the uppermost horizons of deep-sea sediments of the Norwegian-Greenland Sea. Since these gradients coincided with the occurrence of dense populations of epibenthic agglutinated foraminiferans, it was hypothesized that the foraminiferans were the main contributors to the large pool of hydrolytic enzymes observed. Parallel analyses of the enzymatic activity associated with individual foraminiferans selected from the sediments confirmed this hypothesis. Measurements of bacterial biomass (by epifluorescence microscopy) and production (incorporation of tritiated leucine) suggest that in the specific ecological situation analysed, bacteria benefit from the metabolism of foraminiferans rather than being the main decomposers. The immediate degradation at the sediment surface without incorporation of the sedimented particles into the sediment may have an impact on the early diagenesis of organic material and its sedimentary record in these deep-sea sediments.
    Type: Article , NonPeerReviewed
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  • 10
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    Formation of glycolipids by n-alkanes utilizing marine bacteria (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-08
    Description: During a screening for biosurfactants among marine microorganisms it was possible to isolate two marine bacteria producing glycolipids. One strain was identified as Arthrobacter sp. EK l which produced trehalose lipids, mainly a 2,3,4,2'­-trehalose tetraester. From the other pure culture identified as Alcaligenes sp. MM l a new glucose lipid was isolated.
    Type: Article , NonPeerReviewed
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