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  • Artikel  (6)
  • Chemistry  (3)
  • demal  (2)
  • enthalpy
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 1990-1994  (3)
  • 1985-1989  (3)
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  • Artikel  (6)
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  • 1
    Digitale Medien
    Digitale Medien
    Determination of the absolute specific conductance of primary standard KCl solutions (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 515-528 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Absolute standard ; conductivity cell ; demal ; electrolyte ; molality ; potassium chloride ; primary standard ; specific conductance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A determination of the absolute specific conductance of KCl solutions is demonstrated. The measurement is based on the conductance cell with a well defined geometry, having a difference in the removable center tube of accurately measured dimensions. The specific conductance of the solution is obtained from the measured resistances of the cell with and without the center tube and the measured l/A ratio of the center tube. Specific conductances obtained using the cell agree with the previously accepted standards for 0.1 demal and 0.01 demal solutions within 0.02%. Results are also presented for solutions based on molality. The temperature control, bridge, and detector technology used to obtain results of this accuracy are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00664234
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Absolute determination of electrolytic conductivity for primary standard KCl solutions from 0 to 50°C (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 391-401 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Cell constant ; conductance ; demal ; electrolytic conductivity ; potassium chloride ; primary standards ; resistance ; specific conductance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An absolute determination of aqueous electrolytic conductivity has been made for primary standards 0.01D and 0.1D (demal) potassium chloride solutions over the temperature range of 0 to 50°C in 5 degree intervals. A cell with a removable center section of accurately known length and area was used for the measurements. Values were adjusted to be in conformity with the ITS-90 temperature scale. The overall uncertainty over the entire temperature range is estimated to be 0.03%. Values at 25°C for 0.01D and 0.1D KCl solutions are 0.0014086 and 0.012852 S-cm−1, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00650765
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  • 3
    Digitale Medien
    Digitale Medien
    Thermodynamic properties of DCl in D2O solution from 5 to 50°C (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 675-692 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Deuterium chloride ; deuterium oxide ; electrochemical cell ; emf ; enthalpy ; entropy ; free energy ; heat capacity ; isotope effect ; standard potential ; thermodynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The themodynamic properties of solutions of deuterium chloride (DCl) in deuterium oxide (D2O) have been determined from emf measurements of the electrochemical cell without transference from 5 to 50°C, and from 0.002 to 1.0 mol-kg−1. The standard potential of the silver/silver chloride electrode relative to the platinum/deuterium electrode has been determined. An equation for the Gibbs energy as a function of temperature has been derived from which the enthalpy, entropy, and heat capacity have been computed. Equations for the activity coefficient and the osmotic coefficient of DCl in D2O have been developed. The excess Gibbs energy of the solution and the excess partial molar free energy as a function of temperature have been calculated, from which the other excess thermodynamic properties have been computed. The values for the heat capacity and the apparent molar heat capacity have been compared with calorimetric data in the literature. The relative partial molar enthalpy has been calculated. The solvent isotope effect on the excess thermodynamic functions is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00644599
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  • 4
    Digitale Medien
    Digitale Medien
    Radical ions as chain carriers in polymerization reactions (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 12 (1985), S. 105-123 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Certain polymerization reactions show the formation of medium molecular weights at the beginning of the reaction, although they can be considered to be polycondensations. The principle of equal reactivity of the end groups is not given in this case. Intermediates more reactive than the monomer are formed during the reaction. Poly(oxy-2,6-dimethyl-l,4-phenylene), poly(l,4-phenylene sulfide) and poly(l,4-phenylene) are examples of this type of reaction. The formation of radical ions in these reactions is discussed and they are compared to Bunnett's SRN1-reactions.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1985.020121985110
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  • 5
    Digitale Medien
    Digitale Medien
    Sodium activity measurements in protein solutions with sodium amalgam electrodesCertain commercial equipment, instruments, or materials are identified in this article to specify adequately the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose. (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 125-129 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A method using sodium amalgam electrodes has been developed to study the effect of protein on activity measurements and residual liquid junction potential of sodium in protein-containing solutions. It was tested for reliability by application to aqueous sodium chloride solutions before it was applied to protein-containing solutions. The experimentally determined activity coefficients are in good agreement with the activity coefficients for aqueous sodium chloride solutions reported in literature. Therefore, we used this method to measure the activity of NaCl solutions containing varying concentrations of bovine serum albumin (BSA). The electrode slope of the electrode responses in a protein-containing medium does not differ from that of pure aqueous solutions. A functional relationship has been established between the concentration of protein and the percent bias in the measurements. Measurements of electromotive force made in protein-containing solutions do not show any evidence of protein effect on liquid junction potential.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140030209
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  • 6
    Digitale Medien
    Digitale Medien
    Application of environmental electron spectroscopy to AES of bulk ceramics (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 947-950 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Auger spectra from highly samples (Al2O3, Si3N4) are collected in a gaseous environment. It is demonstrated that the build-up of negative surface charge can be reduced considerably under suitable conditions. It is proposed that the decharging of the surface is initiated by Auger neutralization of the ions formed in the gaseous environment in collisions with the primary keV electrons.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740171307
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