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  • 1
    Electronic Resource
    Electronic Resource
    Examination of hydroxamate-siderophore production by neritic eukaryotic marine phytoplankton (1983)
    Springer
    Marine biology 75 (1983), S. 9-17 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Species of neritic eukaryotic marine phytoplankton were investigated during 1982 for hydroxamate-type siderophore production under iron-sufficient and iron-deficient culture conditions. Three of the 5 Prorocentrum species examined produced siderophores. Prorocentrin, the extracellular hydroxamate-type siderophore isolated from P. minimum, was also produced by P. mariae-lebouriae and P. gracile. P. maximum and P. micans grew poorly in iron-deficient medium and did not produce intracellular or extracellular hydroxamate-type siderophores. Thalassiosira pseudonana and Dunaliella tertiolecta produced extracellular siderophores under iron-deficient conditions, but siderophore production was not detected in the other two species, Skeletonema costatum and Olisthodiscus luteus. Each species which produced extracellular Csaky-positive hydroxamate showed a similar pattern of production. Under iron-sufficient conditions there was no measurable siderophore found either intracellularly or extracellularly. Under iron-deficient culture conditions hydroxamate-type siderophore was produced 1 to 2 d after the cessation of growth in the stationary phase. Production was over a short period of time (1 to 2 d) and the siderophore did not remain in the medium. The rate of siderophore disappearance from the medium was similar to the rate of production. Each species which produced siderophores showed an increase in in vivo fluorescence coincidental with the disappearance of the extracellular siderophore from the culture medium. There was no corresponding increase in in vivo fluorescence in iron-sufficient cultures. It is suggested that in vivo fluorescence may be used as a screening procedure for determining hydroxamate-type siderophore production in eukaryotic phytoplankton. An hypothesis on the iron uptake mechanism is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392625
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of methods for the analysis of dissolved urea in seawater (1987)
    Springer
    Marine biology 94 (1987), S. 307-317 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparison between the diacetyl monoxime and urease methods for measuring dissolved concentrations of urea in seawater was conducted in artificial seawater, phytoplankton-culture filtrate and both natural and ureaspiked field samples from coastal and oceanic enviroments during 1984. The urease technique underestimated urea concentrations in unbuffered photoplankton-culture filtrate as a result of the inhibition of the urease enzyme, causing the incomplete hydrolysis of urea in these samples. Factors responsible for inhibiting urease included pH, seawater ions, and possibly extracellular metabolites produced in unialgal cultures. Seawater type and time of sample collection were important variables affecting urea measurement by the urease method, and recovery of internal standards ranged from 40 to 100%. Increasing the heating time of the urease assay, or the concentration of urease added to the seawater samples increased the amount of urea determined by the urease method. However, measured values were still less than the concentration of the urea internal standards. The diacetyl monoxime method was suitable for urea determinations in all the seawater samples we examined; it was easily automated, and the results were accurate and reproducible. This modified technique is recommended for measuring disolved concentrations of urea in seawater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392945
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  • 3
    Electronic Resource
    Electronic Resource
    The occurrence of reducible compounds in an invertebrate structure protein ofBuccinum undatum (L.) (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 557-558 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Reducible compounds, probably similar to lysine-derived cross-links found in collagen and elastin, have been detected in an invertebrate scleroprotein, the egg case ofBuccinum undatum (L.)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990158
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  • 4
    Electronic Resource
    Electronic Resource
    Composition of manganese nodules and manganese carbonates from Loch Fyne, Scotland (1970)
    Springer
    Contributions to mineralogy and petrology 29 (1970), S. 215-233 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Manganese nodules and manganese carbonate concretions occur in the upper 10–15 cm of the Recent sediments of Loch Fyne, Argyllshire in water depths of 180–200 m. The nodules are spherical, a few mm to 3 cm in diameter, and consist of a black, Mn-rich core and a thin, red, Fe-rich rim. The carbonate occurs as irregular concretions, 0.5–8 cm in size, and as a cement in irregular nodule and shell fragment aggregates. It partially replaces some nodule material and clastic silicate inclusions, but does not affect aragonitic and calcitic shell fragments. The nodules are approximately 75% pure oxides and contain 30% Mn and 4% Fe. In the cores, the principal mineral phase is todorokite, with a Mn/Fe ratio of 17. The rim consists of X-ray amorphous Fe and Mn oxides with a Mn/Fe ratio of 0.66. The cores are enriched, relative to Al, in K, Ba, Co, Mo, Ni and Sr while the rims contain more P, Ti, As, Pb, Y and Zn. The manganese carbonate has the composition (Mn47.7 Ca45.1 Mg7.2) CO3. Apart from Cu, all minor elements are excluded from significant substitution in the carbonate lattice. Manganese nodules and carbonates form diagenetically within the Recent sediments of Loch Fyne. This accounts for the high Mn/Fe ratios in the oxide phases and the abundance of manganese carbonate concretions. Mn concentrations in the interstitial waters of sediment cores are high (ca. 10 ppm) as also, by inference, are the dissolved carbonate concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373306
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  • 5
    Electronic Resource
    Electronic Resource
    Rhizobial Nod factors stimulate somatic embryo development in Picea abies (2000)
    Springer
    Plant cell reports 19 (2000), S. 290-297 
    Details
    ISSN: 1432-203X
    Keywords: Key words Picea abies ; Somatic embryogenesis ; Nod factors ; Embryo development ; Protoplast division
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Nod factors are lipochitooligosaccharides (LCOs) secreted by rhizobia. Nod factors trigger the nodulation programme in a compatible host. A bioassay was set up to test how crude (NGR234) and purified (NodS) Nod factors influence cell division and somatic embryogenesis in a conifer, Norway spruce (Picea abies). The Nod factors promoted cell division in the absence of auxin and cytokinin. More detailed studies showed that NodS stimulates development of proembryogenic masses from small cell aggregates and further embryo development. However, stimulation was only observed in low-density cell cultures. Our data suggest that rhizobial Nod factors substitute for conditioning factors in embryogenic cultures of Norway spruce.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050015
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of the protein constituents of sarcoplasmic reticulum isolated from rat skeletal and cardiac muscle (1974)
    Springer
    Cellular and molecular life sciences 30 (1974), S. 1013-1015 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Protein-Zusammensetzung des sarcoplasmatischen Reticulums vom Herzmuskel wurde mittels Polyacrylamid-Gel-Elektrophorese untersucht und ihr Unterschied in der hauptsächlichen Proteinkomponente zum Skelettmuskel SR gefunden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01938979
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  • 7
    Electronic Resource
    Electronic Resource
    Quantitative Structure–Activity Relationships (QSAR) of Cinnamic Acid Bird Repellents (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 2825-2845 
    Details
    ISSN: 1573-1561
    Keywords: Cinnamic acids ; bird repellents ; quantitative structure–activity relationship ; dose–response ; pigeon ; Columba livia ; crop protection ; feeding deterrent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Plants have evolved an array of defense chemicals that inhibit the feeding of vertebrate herbivores and therefore have potential for agricultural and environmental applications to reduce feeding damage. We investigated the relationship between structure and repellency for 14 derivatives of the plant secondary compound, cinnamic acid, using the feral pigeon (Columba livia) as the test species. The mechanism behind the repellent activity of these derivatives is explained by a combination of four descriptors: heat of formation (ΔH f), polarizability (XY and YY) and superdelocalizability (Sr). All these parameters are electronic, indicating that changes in electronic distribution within cinnamic acid structures are crucial for activity. This is the first published quantitative structure–activity model for avian repellents, and as a result we can now begin to predict which cinnamic acid derivatives should make effective repellents. The full power of this model to aid the selection and screening of new repellents awaits further experimentation on both related compounds and other avian species. However, this modeling approach promises to provide a more efficient and economic method for prospecting chemical databases for new effective bird repellents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020863927061
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  • 8
    Electronic Resource
    Electronic Resource
    The distribution of heavy metals in sediments of Sörfjord, West Norway (1972)
    Springer
    Water, air & soil pollution 1 (1972), S. 452-461 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The bottom sediments of Sörfjord, West Norway, contain unusually high concentrations of Ag, Ba, Bi, Cd, Cu, In, Pb, Sb, Sn, and Zn. The concentrations of Zn and Pb reach ∼ 10% by weight in some sediments. The concentrations of most of the elements are positively correlated, those of Pb, Cd, and Cu with Zn being particularly well developed; correlations also exist between Sb and Zn, and Ag and Cu. The concentrations of the metals in the bottom sediments decrease southwards and northwards from a locality close to a source of industrial waste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250664
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  • 9
    Electronic Resource
    Electronic Resource
    Iron antimony oxide selective oxidation catalysts – an inelastic neutron scattering study (2000)
    Springer
    Topics in catalysis 11-12 (2000), S. 223-227 
    Details
    ISSN: 1572-9028
    Keywords: allyl iodide ; 3-iodopropene ; allylpalladium chloride ; selective oxidation catalyst ; inelastic neutron scattering ; vibrational spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The inelastic neutron scattering spectra of allyl iodide (3-iodopropene, CH2=CHCH2I) and allylpalladium chloride, and allyl iodide dosed onto activated iron(III) oxide and iron antimonate catalysts at room temperature have been determined to characterise the adsorbed allyl species. The spectra are energy loss vibrational spectra in the range 16–4000 cm−1. Allyl iodide is not decomposed on the surface and interacts through the localised C = C bond, more strongly with iron antimonate than with iron(III) oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1027242318399
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  • 10
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    Comparison of the protein constituents of sarcoplasmic reticulum isolated from rat skeletal and cardiac muscle (1974)
    Springer
    Details
    Publication Date: 1974-09-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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