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  • Springer  (94)
  • 1990-1994  (86)
  • 1955-1959  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Stoffwechselversuche mit radioaktiv markiertem Echtgelb (1955)
    Springer
    Monatshefte für Chemie 86 (1955), S. 444-448 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Ratten wurden mit radioaktiv markiertem (wasserlöslichem) Echtgelb gefüttert. Der Radiokohlenstoff verteilte sich in qualitativ ähnlicher Weise wie bei Verfütterung des (fettlöslichen) Buttergelbs über die Organe, doch verliefen Aufnahme und Abgabe schneller. Die Ausscheidung erfolgte auch beim Echtgelb im wesentlichen durch den Harn. Für den Unterschied in der krebserregenden Wirkung der beiden Farbstoffe können ihre Löslichkeitseigenschaften daher nicht unmittelbar verantwortlich gemacht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903630
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of endotoxin on membrane fatty acid composition in BCG-sensitized mice (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 472-474 
    Details
    ISSN: 1420-9071
    Keywords: Endotoxin ; fatty acid ; phospholipid ; BCG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of endotoxin on mouse liver phospholipid fatty acid composition have been investigated. Administration of endotoxin fromSalmonella abortus equi led to a decrease in the polyunsaturated fatty acid content of livers from mice sensitized with Bacille Calmette Guérin (GCG). The content of arachidonic acid fell significantly in both the phosphatidylcholine and phosphatidylinositol fractions whereas in the phosphatidylethanolamine fraction the linoleic acid content was significantly reduced. The polyunsaturated fatty acids were replaced by increased amounts of oleic acid and palmitic acid, leading to a reduction in the polyunsaturated to saturated fatty acid ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954235
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  • 3
    Electronic Resource
    Electronic Resource
    Isolierung von freier Benzoesäure aus dem Harn von an Hypophysen-Nebennierenrinden-Hyperfunktion leidenden Kranken (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 539-540 
    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/BF00631420
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  • 4
    Electronic Resource
    Electronic Resource
    Reproductive competition involving oophagy in the socially nesting beeXylocopa sulcatipes (1990)
    Springer
    Naturwissenschaften 77 (1990), S. 38-40 
    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/BF01131797
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  • 5
    Electronic Resource
    Electronic Resource
    Selection and characterization of alpha-amylase-overproducing recombinant Escherichia coli containing the bacterial hemoglobin gene (1992)
    Springer
    Applied microbiology and biotechnology 38 (1992), S. 239-242 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We previously reported that the presence of the bacterial (Vitreoscilla) hemoglobin gene enhances alpha-amylase production in recombinant Escherichia coli strain MK79. Using the growth of MK79 on starch as a selective method we have produced a mutant strain (BSC9) that produces up to four times as much alpha-amylase as MK79. Both MK79 and BSC9 produce the most alpha-amylase (per cell and per milliliter) in the stationary phase; almost all of the enzyme is intracellular in both strains. Modification of the standard alpha-amylase assay increases the amount of amylase detected about sixfold. BSC9 has about five to nine times as many copies per cell as MK79 of the recombinant plasmid, which carries both the amylase and hemoglobin genes, but both strains produce about the same amount of hemoglobin. While MK79 respiration decreases upon going from log to stationary phase, BSC9 respiration increases during the same period. The two latter results may be of particular importance in determining the way in which hemoglobin enhances the production of cloned protein products in recombinant bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174475
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  • 6
    Electronic Resource
    Electronic Resource
    Phylogeny and physiology of Drosophila opsins (1994)
    Springer
    Journal of molecular evolution 38 (1994), S. 250-262 
    Details
    ISSN: 1432-1432
    Keywords: Opsin ; Visual pigments ; Gene family ; Evolution ; Phylogeny ; Spectral sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic and physiological methods were used to study the evolution of the opsin gene family in Drosophila. A phylogeny based on DNA sequences from 13 opsin genes including representatives from the two major subgenera of Drosophila shows six major, well-supported clades: The “blue opsin” clade includes all of the Rhl and Rh2 genes and is separated into two distinct subclades of Rhl sequences and Rh2 sequences; the ultraviolet opsin clade includes all Rh3 and Rh4 genes and bifurcates into separate Rh3 and Rh4 clades. The duplications that generated this gene family most likely took place before the evolution of the subgenera Drosophila and Sophophora and their component species groups. Numerous changes have occurred in these genes since the duplications, including the loss and/or gain of introns in the different genes and even within the Rhl and Rh4 clades. Despite these changes, the spectral sensitivity of each of the opsins has remained remarkably fixed in a sample of four species representing two species groups in each of the two subgenera. All of the strains that were investigated had R1-6 (Rhl) spectral sensitivity curves that peaked at or near 480 nm, R7 (Rh3 and Rh4) peaks in the ultraviolet range, and ocellar (Rh2) peaks near 420 nm. Each of the four gene clades on the phylogeny exhibits very conservative patterns of amino acid replacement in domains of the protein thought to influence spectral sen sitivity, reflecting strong constraints on the spectrum of light visible to Drosophila.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176087
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of water and multi-nutrient stress on xylem sap chemistry, photosynthesis and transpiration of seedlings of two Eucalypts (1992)
    Springer
    Trees 6 (1992), S. 7-12 
    Details
    ISSN: 1432-2285
    Keywords: Eucalyptus ; Nutrients ; Photosynthesis ; Transpiration ; Xylem sap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Ten seedlings each of Eucalyptus kitsoniana Maiden and Eucalyptus globulus Labill. were subjected to two levels of water stress and two levels of nutrient stress (macro and micro-nutrients) in a greenhouse for 3 weeks. The objectives were to determine the degree to which seedlings show differences in sap chemistry, photosynthesis and transpiration that relate to the environments in which these two species live. Whole plants were then extracted for xylem sap using a pressure chamber and the sap was analyzed for 14 elements using an inductively coupled plasma spectrometer and a nitrometer. For E. kitsoniana water and nutrient stress, applied separately or in combination, significantly reduced leaf conductance, transpiration, photosynthesis and midday water potential. Nutrient stress alone had less effect than water stress on most functions measured. Water stress alone reduced the root/shoot ratio; the combination of water and nutrient stress increased the root/shoot ratio, primarily because of reduced shoot weight. In E. kitsoniana, water stress alone or in combination with nutrient stress increased the xylem sap concentrations of B and Si. Multi-nutrient stress alone, or in combination with water stress, significantly decreased sap Zn and K. For this species, sap N was decreased by nutrient stress, but increased by water stress. E. globulus had significantly lower transpiration rates and less root mass than E. kitsoniana. Slightly lower leaf conductance and photosynthesis were not significant in E. globulus compared to E. kitsoniana. Water and nutrient stress reduced conductance, transpiration (except for nutrient stress) and photosynthesis, and the effects of water stress on E. globulus were greater than the effects of nutrient stress. Midday water potential was reduced by water stress. Water or nutrient stress alone did not alter seedling root/shoot ratio, but the combination of water and nutrient stress significantly increased the root/shoot ratio for both species. For E. globulus, sap concentrations of Mn, Na, Si and K were increased by water stress (alone or in combination with nutrient stress). Sap N increased with water stress or combined stresses, but decreased under nutrient stress alone. When the two species were compared, E. globulus generally had lower or similar nutrient concentrations in the sap, with Ca, Mg, Mn and P significantly lower than in E. kitsoniana. Seedlings of these two species show strong site adaptations to water and nutrient availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224492
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  • 8
    Electronic Resource
    Electronic Resource
    Einige Verbesserungen von Nachweisen in der organischen Tüpfelanalyse (1955)
    Springer
    Microchimica acta 43 (1955), S. 996-1003 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Improvements of tests for alcohols, chloral, salicylalcohol, salicine, sulfoxylate compounds and certain reducing organic compounds are described, which lead to microanalytical sensibility and sometimes also to enhanced selectivity.
    Abstract: Résumé On décrit des améliorations des méthodes d'identification des alcools, du chloral, de l'alcool salicylique, de la salicine, de composés sulfoxyliques et de combinaisons organiques réductrices définies. Elles atteignent une sensibilité microanalytique et leur sélectivité est parfois accrue.
    Notes: Zusammenfassung Es werden Verbesserungen von Nachweisen von Alkoholen, Chloral, Salicylalkohol, Salicin, Sulfoxylatverbindungen und bestimmten reduzierenden organischen Verbindungen beschrieben, durch die man zu mikroanalytischer Empfindlichkeit und zum Teil auch zu erhöhter Selektivität gelangt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01223997
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur organischen Tüpfelanalyse (1957)
    Springer
    Microchimica acta 45 (1957), S. 341-353 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Persuant to considerations and experiences derived from the chemistry of specific, selective and sensitive reactions, methods were developed for: 1. Detection of anthraquinone-sulfonic acids, based on the synthesis of polyhydroxyanthraquinones. 2. Detection of secondary alcohols, based on redox reactions with fused sulphur. 3. Detection of succinic acid and succinimide, based on the formation of pyrrole by distillation with zinc dust in the presence of ammonium chloride. 4. Detection of 1,2-diketones, based on the benzilic acid rearrangement. 5. Detection ofα-alanine (differentiation fromβ-alanine), based on the formation of acetaldehyde. 6. Detection of chloranil (differentiation from bromanil), based on the behavior toward pyrrole. 7. Detection of naphtalene, based of the formation of a colored addition compound with chloranil. All of the tests can be accomplished within the technique of spot test analysis, and microanalytical limits of detection are then attainable.
    Abstract: Résumé Sur la base de considérations et de résultats expérimentaux du domaine de la chimie des réactions spécifiques, sélectives et sensibles, les auteurs ont élaboré les techniques d'identification suivantes: 1 Identification d'acides anthraquinonesulfoniques reposant sur la synthèse de polyhydroxyanthraquinones. 2 Identification de groupements alcools secondaires reposant sur des réactions d'oxydoréduction avec le soufre fondu. 3 Identification de l'acide succinique et de la succinimide reposant sur la formation de pyrrole par réduction par la poudre de zinc et distillation en présence de chlorure d'ammonium. 4 Identification de dicétones 1,2 reposant sur la « transposition benzilique». 5 Identification de l'α alanine (différenciation de laβ alanine) reposant sur la formation d'acétaldéhyde. 6 Identification du chloranile (différentiation du bromanile) reposant sur son comportement en présence de pyrrole. 7 Identification du naphtalène reposant sur la formation d'un composé d'addition coloré avec le chloranile. Toutes ces identifications peuvent être effectuées par la technique des réactions à la touche, ce qui permet d'atteindre les limites de détection microanalytiques.
    Notes: Zusammenfassung Ausgehend von Überlegungen und Erfahrungen der Chemie der spezifischen, selektiven und empfindlichen Reaktionen wurden ausgearbeitet: 1. Nachweis von Anthrachinon-Sulfosäuren, beruhend auf der Synthese von Polyhydroxyanthrachinonen. 2. Nachweis sekundärer Alkohole, beruhend auf Redoxreaktionen mit geschmolzenem Schwefel. 3. Nachweis von Bernsteinsäure und Succinimid, beruhend auf der Bildung von Pyrrol durch Zinkstaubdestillation in Gegenwart von Ammoniumchlorid. 4. Nachweis von 1,2-Diketonen, beruhend auf der Benzilsäure-Umlagerung. 5. Nachweis vonα-Alanin (Unterscheidung vonβ-Alanin), beruhend auf der Bildung von Acetaldehyd. 6. Nachweis von Chloranil (Unterscheidung von Bromanil), beruhend auf dem Verhalten zu Pyrrol. 7. Nachweis von Naphthalin, beruhend auf der Bildung einer farbigen Additionsverbindung mit Chloranil. Sämtliche Nachweise sind in der Arbeitsweise der Tüpfelanalyse ausführbar, wobei mikroanalytische Erfassungsgrenzen erreicht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01257273
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  • 10
    Electronic Resource
    Electronic Resource
    Groups acting on S n × R uk : Generalizations of a construction of Hambleton and Pedersen (1991)
    Springer
    K-Theory 5 (1991), S. 333-354 
    Details
    ISSN: 1573-0514
    Keywords: Surgery ; spaceform problems ; L-groups ; arithmetic groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We exhibit infinitely many commensurability classes of smooth closed manifolds M m , for all m ⩾ 12, such that the universal cover of M is the product of a sphere and a Euclidean space and such that π1(M) contains finite dihedral subgroups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535645
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