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  • 1975-1979  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Determination and properties of actively metabolizing heterotrophic bacteria in the sea, investigated by means of micro-autoradiography (1976)
    Springer
    Marine biology 36 (1976), S. 291-302 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Substrate transformation and microbial biomass production in aquatic ecosystems depend mainly on the total number of actively metabolizing heterotrophic bacteria. The most common methods used concern the determination of either the colony-forming bacteria or the total number of bacteria including autotrophs and inactive organisms a micro-autoradiographic method is presented which enables the substrate uptake of single bacteria by means of 3H-amino-acid mixture and Nuclepore filters to be determined. The standardization procedure revealed the greatest success after 3 h incubation with 10 μCi/ml tritiated amino-acid mixture and an exposure of 14 days to the X-ray film. Preliminary experiments showed inactivation of an active fresh-water population from 100% to 0.6% within 3 h at 28‰S. With increasing distance from the shore, the number of colony-forming units decreases from 6 to 0.01% of the total number of active heterotrophic bacteria. It is concluded from the results that the fraction of very small heterotrophic bacteria which cannot be cultured on nutrient media is responsible for the continuous breakdown of organic matter in off-shore regions of the sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389190
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observations of heterotrophic activity on photoassimilated organic matter (1977)
    Springer
    Marine biology 40 (1977), S. 101-108 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The natural heterotrophic utilization of released and particulate photoassimilated compounds by natural phytoplankton populations was followed during the summer of 1975 in the Kiel Bight (Western Baltic Sea). Phytoplankton exudates (2 to 21% of primary production) seem to represent an important substrate for heterotrophic bacteria: uptake rates between 8 and 17,5%/h were observed. Samples incubated with antibiotics indicated that the heterotrophic uptake of phytoplankton exudates during photosynthesis could lead to underestimation of the release rate. Production of 14CO 2was used as an estimate of the mineralization of particulate photoassimilated matter. The mineralization rates measured were in the range of 6 to 20% after 20 h. In order to confirm the quantitative measurements, micro-autoradiographic examinations of the samples were performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396254
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    Paper (German National Licenses)
    Fulltext
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