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  • Articles  (24)
  • Springer  (22)
  • Nature Publishing Group  (2)
  • 1975-1979  (20)
  • 1965-1969  (3)
  • 1960-1964  (1)
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  • Articles  (24)
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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 585-586 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I have investigated the genetic basis of chloroquine resistance in another rodent malaria species, P. chabaudi, which I believe serves as a useful model for P. falciparum. A chloroquine-resistant parasite line (411 AS) of P. chabaudi was obtained in mice by submitting blood forms of a sensitive ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Transition metal chemistry 3 (1978), S. 147-152 
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The association of H+ and Cu2+ with malonate, maleate, succinate and phthalate ions has been investigated both potentiometrically and calorimetrically at 25° and I = 0.1 mol dm−3 (NaClO4). The structures of the complexes existing in aqueous solution are proposed on the basis of thermodynamic data.
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  • 3
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen La inyección de bilirrubina conjugada a ratas Gunn con ligadura coledociana, produce un aumento de la excreción urinaria de bilirrubina C14 exógena o de la endógena sintetizada a partir de la inyección de ALA-C14 en dichos animales. Dicho aumento fue probado por la cristalización de la bilirrubina radioactiva de muestras de orina y por la radioactividad presente en el azopigmento A separado por cromatografía sobre papel. El aumento de pigmento I, demostrado en el suero por partitión química y en la orina por columna cromatográfica de fase inversa, permiten suponer la formación de un complejo de bilirrubina no conjugada radioactiva y de bilirrubina conjugada, como mecanismo del pasaje mencionado.
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  • 4
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Triäthylamin ist ein selektives Fällungsreagens für Phosphormolybdänsäure, das die Trennung von Orthophosphat aus Mischungen von Phosphorsäureestern und Anhydriden erlaubt. Eine einfache Methode zur Bestimmung von Orthophosphat-Triäthylamin-Molybdat wurde beschrieben. Sie beruht auf der Messung der Ultraviolett-Absorption des Komplexes. Fünf bis 250 nMol gefälltes Orthophosphat werden in 3 ml Methanol gelöst und die Absorption dieser Lösung gegen Wasser bei 320 nm gemessen. Der molare Extinktionskoeffizient des Komplexes unter diesen Bedingungen ist 2,09·107 1·Mol−1·cm−1.
    Notes: Summary Triethylamine is a selective precipitant for phosphomolybdic acid which allows separation of orthophosphate from phosphoric acid esters and anhydrides. In this paper a simple method for the estimation of the orthophosphate-triethylamine-rnolybdate complex, based on its ultraviolet absorption spectrum, is described. The precipitate, corresponding to a range of 5–250 nmole of orthophosphate, is dissolved in 3 ml of methanol and the absorbance of the solution measured at 320 nm against water. The molar absorptivity of the complex at this wavelength is 2.09 × 1071·mole−1·cm−1.
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 190-191 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Histochemically, the serotonin contained in Kultschitzky cells and in carcinoid tumours may be demonstrated as intracytoplasmic granules intensely argentamn and faintly positive or negative to chromaffin reaction4. The parenchymal cells of pinealoma (Fig. 1) behave as Kultschitzky cells and ...
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  • 6
    ISSN: 1432-072X
    Keywords: Protoplasts ; Fosfomycin ; Escherichia coli ; Serratia marcescens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A procedure for protoplasts formation from Escherichia coli and Serratia marcescens by treatment with fosfomycin alone is described. This method gives high and low yields of stable protoplasts from E. coli and S. marcescens respectively. In the last case numerous spheroplasts were obtained. Electron micrographs of intact cells, protoplasts and spheroplasts are shown.
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  • 7
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thermodynamic quantities relative to the protonation and the complexation of 2,2′,2′'-terpyridine with copper(II) ion have been determined at 25° and I=0.1 mol dm−3 (NaNO3). The ΔG∘ data was obtained by potentiometric measurements; a copper selective electrode was employed for the study of the complexation equilibria. The ΔH∘ values have been determined by direct calorimetry. The hydrolytic species, existing at pH〉6 and their relative ΔG∘ and ΔH∘ values have also been obtained. From the thermodynamic data the importance of enthalpy and entropy terms in stabilizing the complexes is assessed. Moreover some considerations on the chelating effect are reported.
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  • 8
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of sampling conditions on the levels of adenine nucleotides, pyridine nucleotides, glycolytic intermediates and related metabolites in yeast has been studied. A systematic examination of the conditions for harvesting has shown that it can be best accomplished by rapid filtration. Delays in the handling for removal of the medium, as is usual in the process of obtaining a number of data reported in the literature, lead to important changes in some of the metabolites examined. It is also shown that when a washing is imperative it can be carried out with a methanol-water mixture (50/50, v/v) cooled at −40° without loss of intracellular concentrations of non-readily diffusible metabolites. On the basis of this experience the outline of a generally applicable procedure is presented.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 17 (1977), S. 147-149 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary The lower Vmax of 6PGDH with respect to G6PDH and its higher sensitivity to inhibition by NADPH, suggest the existence of an imbalance between the two dehydrogenases of the pentose phosphate pathway in rat liver. Possible modulators of these activities, particularly in relation with the inhibition by NADPH in physiological conditions, have been investigated. The results suggest that in both cases the inhibition by NADPH is strictly isosteric and that the relative affinities for the reduced and oxidized forms of the pyridine nucleotide are unaffected by glutathion, the intermediates of the pentose phosphate shunt or some divalent ions.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Annali di matematica pura ed applicata 121 (1979), S. 157-169 
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Sunto Dati uno schema X e un suo sottosistema aperto U⊂X, si studiano alcune condizioni affinchè l'omomorfismo canonicoBr(X)→Br(U) fra i relativi gruppi di Brauer sia iniettivo o suriettivo.
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