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1985 (1)
1981 (2)
1977 (1)
1Author    Luigi Sportelli, H. Arald Neubacher, Wolfgang LohmannRequires cookie*
 Title    N O T I Z E N On the Influence of Arom atic R esidues on the Interaction of Copper (II) w ith Small P eptides Containing Arom atic Am ino Acids: ESR and Optical Studies  
 Abstract    The complexation behaviour of C u(II) with di-and tri­ peptides containing the aromatic amino acids phenylalanine or tryptophan has been investigated at different pH-values and compared with results obtained with di-and triglycine. The results obtained by means of ESR and optical absorp­ tion spectroscopy show an influence of the two different aromatic entities on the magnetic and optical param eters. A significant decrease of the < 7||-value and, concom ittantly, an increase of the energy of the d-d transition was m easured when an aromatic entity is present in the peptide. A possible explanation for this observation is given. 
  Reference    (Z. Naturforsch. 32c, 643 [1977]; received May 4 1977) 
  Published    1977 
  Keywords    Copper (II)-Complexes, Peptides, Aromatic Amino Acids, Optical Absorption 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0643_n.pdf 
 Identifier    ZNC-1977-32c-0643_n 
 Volume    32 
2Author    L. Sportelli, A. Desideri, A. CamRequires cookie*
 Title    Isotopic Effect on the Kinetic of Thermal Denaturation of Ceruloplasmin  
 Abstract    The kinetics of thermal denaturation of ceruloplasmin in water and in water with different percentage of D20 in the temperature range 25 — 85 °C, following the optical density change of the 610 nm charge transfer band of the protein has been investigated. A temperature Tt — 65 °C above which an irreversible denaturation process of the protein active site takes place has been found. The kinetics of the denaturation process of the protein are fitted by two first order reactions, which have been assigned to a different thermal denaturation behaviour of the two Cu2+ type I sites existing in the protein. Addition of D 20 to the protein solution affects the two kinetics in a different way, i.e. the rate of one of them is increased whilst that of the other is decreased. The different effect of D20 on the kinetics of disruption of the two copper sites is discussed in terms of different location and degree of hydrophobicity of the two Cu2+ type I sites. 
  Reference    Z. Naturforsch. 40c, 551 (1985); received December 4 1984/March 18 1985 
  Published    1985 
  Keywords    Ceruloplasmin, Deuterium, Optical Absorption, Thermal Denaturation 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0551.pdf 
 Identifier    ZNC-1985-40c-0551 
 Volume    40 
3Author    Rüdiger Kniep, Axel Wilms, HeinzJürgen Beister, Karl SyassenRequires cookie*
 Title    Crystal Growth and Optical Absorption of Compounds InXY [X = Se, Te; Y = Cl, Br, I]  
 Abstract    The systems IngXs-InYs (X = Se, Te; Y = Cl, Br, I) are quasibinary and contain the intermediate ternary compounds InXY with incongruent melting behaviour. InSeCl and InSeBr show a significant phase width towards the respective trihalides. InTeCl is di-morphous with a stable a-and a metastable ^-modification. Crystals of the ternary compounds are grown by Bridgman technique and their optical absorption behaviour is studied. Phase relations as well as optical absorption are discussed with respect to the various crystal structures of the intermediate ternary phases. 
  Reference    Z. Naturforsch. 36b, 1520—1525 (1981); eingegangen am 13. August 1981 
  Published    1981 
  Keywords    Indiumchalcogenohalides, Phase Relations, Crystal Growth, Structural Relations, Optical Absorption 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1520.pdf 
 Identifier    ZNB-1981-36b-1520 
 Volume    36 
4Author    M. Seul, H. Neubacher, W. LohmannRequires cookie*
 Title    Redox Properties of Platinum Uracil "Blues": A New Type of Paramagnetic Species  
 Abstract    The observation of a new type of ESR spectrum in the course of redox experiments on a platinum uracil "blue" compound is reported. Some characteristic features of the ESR and optical absorption spectra are described. A tentative analysis of the ESR spectrum is pre-sented, based on the assumption of localized states. 
  Reference    Z. Naturforsch. 36b, 272—274 (1981); received October 26 1980 
  Published    1981 
  Keywords    Redox Experiments, ESR Spectra, Optical Absorption, Platinum Uracil "Blues", Localized States 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0272_n.pdf 
 Identifier    ZNB-1981-36b-0272_n 
 Volume    36