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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of GA20 glucosyl derivatives and the biological activity of some gibberellin conjugates (1984)
    Springer
    Journal of plant growth regulation 3 (1984), S. 207-215 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract GA20-13-0-glucoside (7a) and GA20 glucosyl ester (6a), potential endogenous conjugates in maize, were synthesized chemically. The biological activities of these compounds and of nine more GA glucosyl derivatives were determined using theZea mays dwarf- 5 seedling andOryza sativa cv. “Tan-ginbozu” assays. The relative bioactivities of the conjugates were also calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042005
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of carbon-specific respiration rates in gelatinous and non-gelatinous zooplankton: A search for general rules in zooplankton metabolism (1992)
    Springer
    Helgoland marine research 46 (1992), S. 377-388 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using 470 data from the literature the dry weight-specific respiration rates of gelatinous zooplankton (cnidarians, ctenophores and salps) and non-gelatinous zooplankton (mainly crustacea) were converted to carbon-specific values. The resulting carbon-specific respiration rates showed no significant differences between the two groups of zooplankton, indicating similar oxygen requirements per gram of carbon biomass. From this finding, it can be suggested that the differences in the rates of oxygen consumption measured in the two types of zooplankton in the sea can be explained by the carbon biomass ratio between gelatinous and non-gelatinous zooplankton. Furthermore, the low rate of metabolism of gelatinous species compared with that of non-gelatinous animals of the same volume can be attributed predominantly to the relatively low organic matter content in the former. It is recommended that all weight-specific metabolism rates be expressed using carbon as body mass unit (e.g. mg O2 gC−1 d−1) which enables more accurate comparisons between individuals exhibiting different dry weight/carbon ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367205
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  • 3
    Electronic Resource
    Electronic Resource
    Ein Präparator (1867)
    Springer
    Journal of ornithology 15 (1867), S. 360-360 
    Details
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261636
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of summer nutrient data obtained in Königshafen Bay (North Sea, German Bight) during two investigation periods: 1979–1983 and 1990–1992 (1994)
    Springer
    Helgoland marine research 48 (1994), S. 173-182 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A comparison of summer nutrients obtained during the investigation periods 1979–1983 and 1990–1992 was made, to elucidate whether or not changes have occurred in Königshafen Bay during the last decade. In both the flood current as well as in the ebb current, concentrations of silicate, phosphate, nitrite and nitrate have decreased. Ammonia, however, has increased by a factor of two in the flood current waters, but was similar in both investigation periods in the ebb current waters. In addition, a significant increase of salinity has been observed. The differences between flood and ebb current median nutrient concentrations suggest that the bay was a source of nutrients during the 1979–1983 period, exporting large amounts of silicate, nitrite and ammonia with the ebb current. Today, the bay appears to be more a sink than a source of nutrients. Export rates of silicate and nitrite are greatly reduced and phosphate and ammonia are imported nowadays. Nitrate fluxes were in balance during both periods. Reasons for the observed changes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02367034
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  • 5
    Electronic Resource
    Electronic Resource
    Low molecular weight, polymeric, and covalently bound cobalt(II)-phthalocyanines for the oxidation of mercaptans (1991)
    Springer
    Journal of inorganic and organometallic polymers and materials 1 (1991), S. 115-130 
    Details
    ISSN: 1572-8870
    Keywords: Phthalocyanine-cobalt complexes ; catalyst ; thiol oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cobalt(II)-phthalocyanines in different environments are investigated as catalysts for the oxidation of thiols. Water-soluble low molecular weight 2,9,10,23-tetracarboxyphthalocyanine (1b) and polymeric phthalocyanine (2b) with carboxylic end groups are prepared. Compound1b is covalently bound at linear and cross-linked poly(chloromethylstyrene) in the presence of pyridine to obtain the water-soluble polymers (3a, b) and gel-type polymers (4a, b). Covalent binding of1b to surface modified silica was also realized. Low molecular weight and polymeric phthalocyanines (1a, 2a) are synthesized on silica, alumina, and charcoal. In addition,1a is encapsulated in the interior of NaX zeolite. All materials are efficient catalysts for the oxidation of 2-mercaptoethanol. The mechanism employing water-soluble catalysts is discussed in the direction of a mononuclear complex coordinating dioxygen and thiol. Heterogeneous catalysts containing1a and2a on the carriers show enhanced activity with increasing dispersion. The proposed mechanism considers different reaction sites for the coordination of O2 and thiol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00701033
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen an Thermoelementen aus dem System Iridium-Rhenium (1956)
    Springer
    The European physical journal 144 (1956), S. 256-262 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Thermospannungen von. Ir, Re und von Legierungen des Systems Ir-Re gegen W wurden bis 2450° C gemessen. Die obere Grenze für die Verwendbarkeit derartiger Thermoelemente dürfte je nach der Kombination zwischen 2000 und 2400° C liegen. Aus den systematischen Untersuchungen, die sich über das ganze Konzentrationsintervall erstreckten, ergibt sich als besonders geeignetes Thermopaar: Ir gegen IrRe 70 (mit 70 Gew.-% Re). Dieses Thermopaar könnte auch noch an leicht oxydierender Atmosphäre bei vertretbarer Lebensdauer zu reproduzierbaren Temperaturmessungen wenig oberhalb 2000° C verwandt werden, da sich bei der bevorzugten Re-Verflüchtigung über Oxydbildung eine Verminderung der Re-Konzentration des Re-Mischkristalls um 10 bis 15% nur in einer verhältnismäßig geringen Temperaturfehlanzeige bemerkbar machen würde (etwa 30° C bei 2000° C).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327087
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  • 7
    Electronic Resource
    Electronic Resource
    In vivo perfusion of human thyroid tissue with 4-14C-dehydroepiandrosterone and 7α-3H-dehydroepiandrosterone sulfate. Metabolism of steroid conjugates. X (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 210-211 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Bei der In vivo-Perfusion menschlichen Schilddrüsen-Strumagewebes mit 4-14C-DHEA und 7α-3H-DHEA-Sulfat zeigte es sich, dass unter physiologischen Bedingungen eine beachtliche Hydrolyse von Steroid-Sulfat eintrat. Demgegenüber liess sich keine Steroid-Sulfokinase oder Steroid-Glucuronosyl-Transferase nachweisen. Der Anteil der Metaboliten erreichte in der Fraktion der freien Steroide ungefähr 30% isolierter Verbindungen, in der Fraktion der Steroid-Sulfate jedoch nur etwa 14%. Androstendiol erwies sich als wichtigster Metabolit, gefolgt von Androstendion und Androstentriol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935765
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  • 8
    Electronic Resource
    Electronic Resource
    Eine Pupillenreaktion im Ommatidium vonTenebrio molitor (1967)
    Springer
    Naturwissenschaften 54 (1967), S. 542-542 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627226
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  • 9
    Electronic Resource
    Electronic Resource
    Langsame Belichtungspotentiale des Auges vonHelix pomatia L. (1967)
    Springer
    Naturwissenschaften 54 (1967), S. 591-592 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636833
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  • 10
    Electronic Resource
    Electronic Resource
    Chinaalkaloide in Ölbaumblättern (1971)
    Springer
    Naturwissenschaften 58 (1971), S. 524-524 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623324
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