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1990 (2)
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1Author    H. Janzen, E. Matuszak, E. V. Goldammer, AnnenBundesrepublik Deutschland, H. R. WenzelRequires cookie*
 Title    Thermodynamic and Magnetic Resonance Studies on the Hydration of Polymers: II. Protein-Water Interactions in Powdered Ribonuclease  
 Abstract    ESR studies on spin-labeled amorphous RNase A as a function of varying concentrations of sorbed H 2 0 and D 2 0 will be presented. A relaxation analysis of saturation transfer (ST-)ESR spectra of l4 N('H) nitroxide spin-label molecules essentially fixed at amino acid residue His-105 will be given. A characteristic correlation has been observed between the microdynamic behavior — express-ed by the rotational correlation times of the paramagnetic label — and the macroscopic thermo-dynamic entropy for the sorption process of H 2 0 and D 2 0 at RNase. This correlation is particu-larly pronounced at low water concentrations, viz., n H20 /n protein < 100. A significant difference in this concentration range exists between the two systems "RNase-H 2 0" and "RNase-D 2 0", which is manifested not only by the thermodynamic data but also by the microdynamic behavior ex-tracted from the corresponding non-linear ESR absorption line shapes. 
  Reference    Z. Naturforsch. 43c, 285—293 (1988); received December 18 1987 
  Published    1988 
  Keywords    Protein, Structure, Hydration, NMR, Thermodynamic 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0285.pdf 
 Identifier    ZNC-1988-43c-0285 
 Volume    43 
2Author    J. Von CieminskiRequires cookie*
 Title    Modeling of High-Signal Electrostriction. I  
 Abstract    A thermodynamical calculation of high-signal electrostriction, especially of ferroelectric materials, is proposed. It permits to model the high-signal electrostriction of the paraelectric and the funda-mental switching behaviour of the ferroelectric phase. Extraordinary high-signal deformation curves can be explained, the influence of the thermodynamical coefficients can be estimated and the order of phase transitions can be determined experimentally from the high-signal deformation curves. 
  Reference    Z. Naturforsch. 45a, 1090—1094 (1990); received May 8 1990 
  Published    1990 
  Keywords    Electromechanical properties, Electrostriction, Ferroelectrics, Thermodynamic, Phase transition 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-1090.pdf 
 Identifier    ZNA-1990-45a-1090 
 Volume    45 
3Author    J. Von CieminskiRequires cookie*
 Title    Modeling of High-Signal Electrostriction. II  
 Abstract    The predictions obtained with a thermodynamical method are compared with experimental results. Several materials which pass a ferroelectric phase transition of first or second order are investigated. The predictions correspond well with the experimentaly determined qualitative and quantitative features as to the field and temperature dependence. Finally, extraordinary strain-field curves are predicted and proved. 
  Reference    Z. Naturforsch. 45a, 1095—1101 (1990); received May 8 1990 
  Published    1990 
  Keywords    Electromechanical properties, Electrostriction, Ferroelectrics, Thermodynamic, Phase transition 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-1095.pdf 
 Identifier    ZNA-1990-45a-1095 
 Volume    45 
4Author    Salvatore SorrisoRequires cookie*
 Title      
 Abstract    The electric dipole moments of acetyldiazomethane (MeCOCHN2) and 1-acetyl-1-diazo-ethane (MeCOCMeN2) between 10 and 70 °C have been measured. Using appropriate group and bond moments, the concentrations of the two rotamers present in each have been calculated and, hence, the equilibrium constant for the cis trans equilibrium at the various temperatures. ^ The change in standard enthalpy (A H°), standard free energy (A G°) and standard entropy (A S°) are reported for the conversion of one mole of cis isomer to trans isomer. 
  Reference    Z. Naturforsch. 34b, 1530—1534 (1979); received May 17 1979 
  Published    1979 
  Keywords    Dipole Moments, Diazoketones, Thermodynamic, Dielectric Measurements 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1530.pdf 
 Identifier    ZNB-1979-34b-1530 
 Volume    34