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  • 1
    Electronic Resource
    Electronic Resource
    The common jellyfish Aurelia aurita: standing stock, excretion and nutrient regeneration in the Kiel Bight, Western Baltic (1989)
    Springer
    Marine biology 100 (1989), S. 507-514 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The population dynamics, ammonia and inorganic phosphate excretion, and nutrient regeneration of the common jellyfish Aurelia aurita was investigated from 1982 to 1984 in the Kiel Bight, western Baltic Sea. During summer 1982, medusae abundance ranged between 14 and 23 individuals 100 m-3, biomass was estimated at about 5 g C 100 m-3 and the mean final diameter of individuals was 22 cm. Abundance, based on numbers, in 1983 and 1984 was an order of magnitude lower; biomass was less than 2 g C 100 m-3 and jellyfish grew to 30 cm. During the summers of 1983 and 1984, A. aurita biomass constituted roughly 40% of that of the total zooplankton〉200 μm. In 1982, for which zooplankton data were lacking, it was assumed that medusae biomass was greater than that of all other zooplankton groups. Total ammonia excretion ranged between 6.5 and 36 μmol h-1 individual-1, whereas inorganic phosphate release was 1.4 to 5.7 μmol h-1 individual-1. Allometric equations were calculated and exponents of 0.93 for NH4−N release and 0.87 for PO4−P excretion were determined. Nitrogen and phosphorus turnover rates were 5.4 and 14.6% d-1, respectively. In 1982, the medusae population released 1 100 μmol NH4−N m-2 d-1, about 11% of the nitrogen requirements of the phytoplankton. The inorganic phosphate excretion (150 μmol m-2 d-1) sustained 23% of the nutrient demands of the primary producers. In the other two years the nutrient cycling of the medusae was much less important, and satisfied only 3 to 6% of the nutrient demands. It is suggested that in some years A. aurita is the second most important source of regenerated nutrients in Kiel Bight, next to sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394827
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  • 2
    Electronic Resource
    Electronic Resource
    Ecological genetics of Rhizobium meliloti: Diversity and competitive dominance (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 40 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Symbiotic effectiveness (nitrogen-fixation ability) is not a measure of inter-strain competitiveness, and Rhizobium strains used as inocula frequently compete poorly with indigenous rhizobia for nodulation of the host legume. Competition between rhizobia delimits the use of Rhizobium inoculum in agriculture. We therefore chose to investigate aspects of the gene pool represented by an indigenous population of R. meliloti selected for maximum diversity, particularly for evidence of competitive dominance. This unadapted population was very heterogeneous in terms of plasmid content, somatic antigens and intrinsic antibiotic resistance (IAR). Little tendency towards competitive dominance (measured in terms of nodule occupancy) was observed. Classical methods (serotype, IAR) of characterising strains did not correlate to define dominance of a strain or a group of strains. The data are consistent with a continuum of symbiotically proficient strains under conditions of maximum diversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02033.x
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  • 3
    Electronic Resource
    Electronic Resource
    High intrinsic coercivities in iron-rare earth-carbon-boron alloys through the carbide or boro-carbide Fe14R2X (X=BxC1−x) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3574-3576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the phase Fe14R2X, where R is a lanthanide and X is either boron or carbon, or a mixture of the two, the extent of stability of the carbides and their miscibility with the borides is traced for the lighter rare-earth metals. Like the borides, the carbides are magnetically hard, but unlike them, they do not normally crystallize from the melt, and this property is exploited to produce intrinsic coercivities above 12 kOe in cast materials without the added special processing step of sintering or melt spinning. The high coercivity is related to a cellular microstructure of Fe14R2X in which the cell size is approximately 1 μm. The cell structure, which originates in a peritectoidlike transformation from primary Fe17R2, is quite stable and does not change during prolonged annealing. The coercivity is sensitive to variations in composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338705
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  • 4
    Electronic Resource
    Electronic Resource
    Cadmium and copper levels in seals, penguins and skuas from the Weddell Sea in 1982/1983 (1986)
    Springer
    Polar biology 5 (1986), S. 139-143 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Samples of muscle, liver and kidney of Weddell and crabeater seals, Adélie and emperor penguins, and McCormick's skuas collected in the Weddell Sea in the summer 1982/83 were analysed for cadmium and copper. In general, the study aimed at contributing to the establishment of base-line data on potential pollutants in Antarctic ecosystems. In particular, it aimed at increasing the amount of data on Cd and Cu levels in the same species that that had been collected and analysed two years eralier, thus improving the possibility of statistical analyses into relationships between metal contents and biological parameters or sampling-sites of the animals, but the data basis is still too small for the letter purpose. In all species together, concentration ranges (on dry weight basis) were 0.16–0.77, 3.7–96.8 and 15.6–491 mg cadmium and 1.6–21.4, 14.9–149 and 12.6–47.7 mg copper per kg in muscles, livers and kidneys, respectively. The relatively high levels of both metals in all species analysed, in connexion with the available literature, suggest that levels in marine mammals and birds can only, if at all, to a minor extent reflect differences in environmental concentrations of these metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00441693
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  • 5
    Electronic Resource
    Electronic Resource
    GC-MS identification of GA20-13-O-glucoside formed from GA20 in normal plants and dwarf-1 mutants ofZea mays L. (1987)
    Springer
    Journal of plant growth regulation 5 (1987), S. 217-223 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract After feeding GA20 to excised seedlings ofZea mays L. normals (N) and dwarf-1 mutants (d1), GA20-13-O-glucoside (9) was identified by HPLC and by GC-MS of its permethylated derivative. The glucosylation rate of GA20 was found to be higher in the dwarf-1 mutant (26%) than in the normal plant (3.6%). This article includes a GC-MS study in which diagnostic fragments from the spectra of permethylated synthetic GA glucosides have been selected that proved to be useful for the identification of permethylated GA glucosides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02030136
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  • 6
    Electronic Resource
    Electronic Resource
    Thermodesorption of ultrathin organic films studied by reflection (1986)
    Springer
    Applied physics 39 (1986), S. 173-181 
    Details
    ISSN: 1432-0630
    Keywords: 44.50 ; 78.65 ; 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Optical reflection measurements are described as a new and simple technique to measure thicknesses and thickness changes of ultrathin organic overlayers on inorganic support. The prime advantages are high sensitivity in thickness measurements (0.1–1 Å), applicability under varying environmental conditions, nondestructiveness, applicability on different supports and high time resolution. These features are assessed theoretically and experimentally studying Langmuir-Blodgett films on SiO2 and Au supports. These films, in this work prepared with the model compound arachidic acid, provide the salient feature of well-defined thicknesses in integer multiples of 26.7 Å. Application of the technique in thermodesorption experiments reveals distinguished binding states with binding energies (73–110 kJ/mol) depending on the counterion (Mg2+ or Cd2+) used in preparing the films and ratios of different states depending on thickness. The binding energy for the main component of multilayers (73 and 81 kJ/mol) with thickness larger than 100 Å is comparable to the heat of evaporation of bulk fatty acids. In addition an analytic expression between layer thicknesses and reflection is derived from the Fresnel equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620732
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  • 7
    Electronic Resource
    Electronic Resource
    A note of thanks (1989)
    Springer
    Natural hazards 1 (1989), S. 401-401 
    Details
    ISSN: 1573-0840
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134838
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  • 8
    Electronic Resource
    Electronic Resource
    Metabolism measurements ofAurelia aurita planulae larvae, and calculation of maximal survival period of the free swimming stage (1985)
    Springer
    Helgoland marine research 39 (1985), S. 43-47 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Respiration, ammonia and phosphate excretion experiments were performed with planula larvae ofAurelia aurita (Scyphozoa) from Kiel Fjord, Baltic Sea, in summer 1983. The mean respiration measured was 3.22 nl O2 ind−1 h−1 (at ∼ 20 °C). Excretion experiments revealed average values of 11.41 pM NH4-N ind−1, and 0.92 pM PO4-P ind−1h−1, respectively. The atomic C:N:P ratio of excretion products was 133:10:1. The O:N ratio of 25:1 and O:P ratio of 313:1 point to a lipid-carbohydrate-oriented catabolism of theAurelia larvae. On the basis of experimental results and of biomass determinations, the maximal survival period of the non-feeding free swimming planula stage was calculated. Typically, the value lies in the range of some days to one week.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997518
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  • 9
    Electronic Resource
    Electronic Resource
    Metabolic formation and occurrence of gibberellin A1-3-0-β-D-glucopyranoside in immature fruits of Phaseolus coccineus L. (1989)
    Springer
    Plant growth regulation 8 (1989), S. 85-90 
    Details
    ISSN: 1573-5087
    Keywords: Gibberellin A1 glucoside ; runner bean ; Phaseolus coccineus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Endogenous pools of presumptive gibberellin (GA) glucosyl conjugates of Phaseolus coccineus were metabolically labelled by feeding of [3H]GA1 to immature fruits. The [3H]GA1 glucoside fraction was isolated and the main constituent tentatively identified by enzymic hydrolysis, ion exchange chromatography and elution volume on HPLC-RC as GA1-3-0-β-D-glucopyranoside.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040919
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  • 10
    Electronic Resource
    Electronic Resource
    Cellular response to ectopically implanted silk sutures and osteopetrotic bone (1987)
    Springer
    Cell & tissue research 248 (1987), S. 79-88 
    Details
    ISSN: 1432-0878
    Keywords: Bone resorption ; Implantation ; Osteoclasts ; Osteopetrosis ; Mononuclear phagocytes ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Faulty osteoclasts, characteristic of the incisors-absent (ia) rat mutation of osteopetrosis, cause a resorptive defect which results in the persistence of immature, highly mineralized bone matrix. We implanted osteopetrotic bone subcutaneously into normal andia rats to determine ifia bone could induce functionally active and morphologically identifiable osteoclasts at the implant surface. Assays of45Ca released from the preparations showed that normal andia recipients were capable of equivalent cell-mediated release of Ca over a 2-week implant period, indicating that theia resorptive defect was not reproduced at the subcutaneous site. Freeze-thawed osteopetrotic bone released twice as much45Ca as normal bone. This difference was eliminated by collagenase treatment. Cellular profiles were similar in both normal andia animals regardless of the implant preparation. At 3 days after implantation, both bone and suture were surrounded by mononuclear cells. By 14 days, multinucleated cells appeared at the implant surfaces. Morphological comparison of implant-induced multinucleated cells and tibial osteoclasts indicated that bone-elicited multinucleated cells lacked the ruffled borders characteristic of normal osteoclasts or the extensive clear zones typical ofia osteoclasts, but more closely resembled suture-induced macrophage-polykaryons. We conclude that ectopically implantedia bone as compared to normal bone elicits a different functional response from structurally similar cell populations. Bone-elicited multinucleated cells could not be classified as active osteoclasts despite evidence of release of45Ca. Release of labeled Ca was probably due to the action of mononuclear phagocytes and macrophage-polykaryons rather than to osteoclastic resorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01239966
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