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  • Springer  (31)
  • 1980-1984  (12)
  • 1975-1979  (19)
  • 1950-1954
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of alternating polyesteramides (1982)
    Springer
    Polymer bulletin 8 (1982), S. 109-116 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Aliphatic and partially aromatic alternating polyesteramides were prepared from appropriate bisesteramides and aliphatic diols of various chain length. An investigation of their thermal and viscoelastic behaviour showed that the Tm and Tg values of such polyesteramides are those to be expected for a system with intermediate properties between those of the two homopolymers. A discussion of the experimental Tm values in terms of group contributions is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263016
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of binary mixtures: Volumes, heat capacities, and dilution enthalpies for then-pentanol+2-methyl-2-butanol system (1983)
    Springer
    Journal of solution chemistry 12 (1983), S. 383-400 
    Details
    ISSN: 1572-8927
    Keywords: Densities ; apparent molar volume and heat capacities ; dilution enthalpies ; expansibilities ; hydrogen-bonded mixtures ; n-pentanol ; 2-methyl-2-butanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The densities, heat capacities, and dilution enthalpies ofn-pentanol+2-methyl-2-butanol mixtures have been measured, in many cases as a function of temperature, over the complete mole fraction range. Excesses thermodynamic properties, apparent and partial molar heat capacities, volumes and expansibilities were derived. The concentration and temperature dependences of these functions are discussed in terms of the variations of the structure of the system caused by the participation of the two alcohol molecules (with quite different steric hindrance of the alkyl chain around the-OH group) in the dynamic intermolecular association process through hydrogen bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646392
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  • 3
    Electronic Resource
    Electronic Resource
    Conductance of potassium halides near the temperature of maximum density of water (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 351-356 
    Details
    ISSN: 1572-8927
    Keywords: Temperature of maximum density of water ; conductance ; potassium halides ; mobilities ; Walden product ; structural effects ; activation energy ; temperature dependence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The conductances of dilute aqueous solutions of KCl, KBr, and KI have been measured over the temperature range 2 to 8°C and have been analyzed by the Fuoss-Hsia equation. The ionic Walden products at infinite dilution have been discussed in terms of local viscosity. The temperature dependence of these products suggest that near the temperature of maximum density of water, the structure-breaking ability of these ions changes in a regular way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647040
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of alcohols in a micellar phase. Binding constants and partial molar volumes of pentanol in sodium dodecylsulfate micelles at 15, 25, and 35°C (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 121-150 
    Details
    ISSN: 1572-8927
    Keywords: Pentanol ; sodium dodecylsulfate ; micelles ; apparent molar volume ; alcohol-micelle binding constant ; water-micelles alcohol distribution ; mixed micelles ; Poisson statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities of the ternary system water-sodium dodecylsulfate (NaDS)-pentanol and of the binary systems butanol-octane and pentanol-octane were measured at 15, 25, and 35 °C. The apparent molar volume of pentanol in the ternary system was analyzed using a mass-action model for the alcohol distribution in micellar solutions. The partial molar volume of alcohol bound to the micelles and the ratio between the binding constant and the aggregation number of the surfactant are calculated. The partial molar volume binding constant, is discussed in terms of solubilization sites of the alcohol in the micelles whereas the binding constant is compared with that derived from the Nernstian partition constant previously obtained calorimetrically. From the binding constant and Poisson statistics the distribution function of the number of alcohol molecules per micelle, as a function of the concentration of alcohol and of surfactant, are calculated. The derived distribution functions show that a large amount of alcohol can be solubilized in the micelles so that alcoholic mixed micelles can be predicted when the concentration of pentanol is greater than that of NaDS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646044
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamics of copper(II) dicarboxylate coordination in aqueous solution (1978)
    Springer
    Transition metal chemistry 3 (1978), S. 147-152 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01393532
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  • 6
    Electronic Resource
    Electronic Resource
    Orthophosphate determination: A simple spectrophotometric method for the measurement of the orthophosphate-triethylamine-molybdate complex (1979)
    Springer
    Microchimica acta 72 (1979), S. 181-185 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197370
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  • 7
    Electronic Resource
    Electronic Resource
    Protoplast-like structures formation from two species of enterobacteriaceae by fosfomycin treatment (1978)
    Springer
    Archives of microbiology 118 (1978), S. 219-221 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415732
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  • 8
    Electronic Resource
    Electronic Resource
    Thermodynamics of 2,2′,2′'-terpyridinecopper(II) complexes in aqueous solution (1979)
    Springer
    Transition metal chemistry 4 (1979), S. 328-332 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618328
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of intermediary metabolites in yeast. Critical examination of the effect of sampling conditions and recommendations for obtaining true levels (1976)
    Springer
    Molecular and cellular biochemistry 13 (1976), S. 73-78 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01837056
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  • 10
    Electronic Resource
    Electronic Resource
    Effectors of glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase of rat liver. (1977)
    Springer
    Molecular and cellular biochemistry 17 (1977), S. 147-149 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730834
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