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  • 1
    Electronic Resource
    Electronic Resource
    High-affinity uptake of an ammonium analogue by two marine microflagellates from the oligotrophic Pacific (1983)
    Springer
    Marine biology 74 (1983), S. 161-168 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two marine microflagellates, isolated from the North Pacific Central Gyre, and tentatively identified as Platymonas sp. and Mantoniella sp., were examined for uptake of 14C-methylamine, a non-metabolizable analogue of ammonium. Half-saturation constants (K m) for ammonium transport, estimated from competitive inhibition of methylamine transport by ammonium, were 50 nM for Platymonas sp. and 2.9 nM for Mantoniella sp. These values are the lowest so far reported, indicating that the transport systems are well adapted to extremely low ammonium environments. The ratio of the K m for methylamine to the K m for ammonium was 17 for Platymonas sp. and 41 for Mantoniella sp. The observed ratios fell within the relatively narrow range reported for various organisms, including bacteria, fungi and phytoplankton (25.0±15.5, $$\bar x$$ ± SD, n=9), although the reported K mvalues for both ammonium and methylamine vary over a thousand-fold range. The use of 14C-methylamine may therefore be a promising technique for studying the kinetics of ammonium transport by marine microorganisms, particularly those in oligotrophic environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413919
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of high organotrophic potentiality of bacteria in the deep ocean (1974)
    Springer
    Marine biology 26 (1974), S. 1-4 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The organotrophic potentiality of heterotrophic microorganisms 50 cm above the ocean floor (5,207 m depth) was measured in situ, at a station in the subarctic Pacific Ocean (44° N; 154° E). In certain enriched deep-sea samples incubated in situ, the microorganisms exhibited nearly the same organotrophic activity as those in the surface water layers. Rod-shaped barophilic bacteria (0.4 to 0.6 μ x 1.0 to 2.0 μ), which multiplied at a generation time of about 10 h, were responsible for this activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389080
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrate metabolism in abyssal waters (1975)
    Springer
    Marine biology 29 (1975), S. 119-124 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Activities of nitrate assimilation and nitrate reduction were measured 50 cm above the ocean floor (5,845 m and 5,207 m) by an in situ 15N tracer technique at stations in the subtropical (28°29.8′N; 144°58′E) and subarctic (44°10.2′N; 154°03′E) western North Pacific Ocean. Nitrate assimilation ranged from 0.009 to 0.11 μg-at N/1/day, and nitrate reduction from 0 to 0.42 μg-at N/1/day in the presence of added peptone and yeast extract. Nitrate assimilation was higher than nitrite formation at the southern station, but the reverse was the case at the subarctic station. No correlation was observed between bacterial growth and nitrate metabolizing activities. Data are also presented on the effect of hydrostatic pressures upon nitrate metabolism by microbial populations in the surface waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388983
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  • 4
    Electronic Resource
    Electronic Resource
    Importance of foraminifera for the formation and maintenance of a coral sand cay: Green Island, Australia (2000)
    Springer
    Coral reefs 19 (2000), S. 51-58 
    Details
    ISSN: 1432-0975
    Keywords: Key words Coral sand cay ; Foraminifera ; Sea level ; The Great Barrier Reef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract  CaCO3 production by reef-building organisms on Green Island Reef in the Great Barrier Reef of Australia is estimated and compared with the contribution of benthic foraminifera to the sediment mass of the vegetated sand cay. Major constituents of the cay are benthic foraminifera (mainly Amphistegina lessonii, Baculogypsina sphaerulata, and Calcarina hispida), calcareous algae (Halimeda and coralline algae), hermatypic corals, and molluscs. Among these reef-building organisms, benthic foraminifera are the single most important contributor to the sediment mass of the island (ca. 30% of total sediments), although their production of CaCO3 is smaller than other reef-building organisms. Water current measurements and sediment traps indicate that the velocity of the current around Green Island is suitable for transportation and deposition of foraminiferal tests. Abundant foraminifera presently live in association with algal turf on the shallow exposed reef flat, whose tests were accumulated by waves resulting in the formation and maintenance of the coral sand cay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003380050226
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  • 5
    Electronic Resource
    Electronic Resource
    NMR study of amorphous cobalt alloys made by sputtering (1989)
    Springer
    Hyperfine interactions 51 (1989), S. 1069-1069 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407827
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  • 6
    Electronic Resource
    Electronic Resource
    A study on the distribution of total bacteria, bacterial aggregates and heterotrophic bacteria in the sea (1972)
    Springer
    Journal of oceanography 28 (1972), S. 103-108 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The concentrations of total bacteria, bacterial aggregates and so-called heterotrophic bacteria were compared and discussed with special reference to the watermasses that vertically layered at the western North Pacific central region and the subarctic Pacific region. The concentrations of bacterial aggregates, having cells more than 25, were considerably uniform throughout the ocean depths. This was also shown indirectly by the measurements of size spectrum and organic constituents of particles, especially in the subsurface and deep watermasses. The so-called heterotrophic bacteria decreased in their concentration in deeper watermass, and the decrease was not obvious within each watermass but obvious among watermasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109771
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    Paper (German National Licenses)
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