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1Author    YuA. Babanov, A. F. Sidorenko, V. R. Shvetsov, M. Bionducci, G. Licheri, G. Navarra, A. L. Ageev, V. V. VasinRequires cookie*
 Title    Combination of EXAFS and Differential Anomalous X-ray Scattering for Studying Ni 2 Zr Amorphous Alloy  
 Abstract    In this paper we report a first application of the new idea of combining EXAFS and differential anomalous scattering techniques to obtain partial distribution functions for a binary amorphous sample. This method has been successfully employed in extracting Ni-Ni and Ni-Zr pair distribu-tion functions for Ni 2 Zr prepared by mechanical alloying. A comparison with results from previous studies is also reported. 
  Reference    Z. Naturforsch. 47a, 1191—1196 (1992) 
  Published    1992 
  Keywords    Metallic glasses, Synchrotron radiation, Partial pair distribution functions 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-1191.pdf 
 Identifier    ZNA-1992-47a-1191 
 Volume    47 
2Author    F. Bell, Th Tschentscher, J. R. Schneider, A. J. RollasonRequires cookie*
 Title    Electron Momentum Densities by (y, e y)-Spectroscopy  
 Abstract    We report coincidence measurements of inelastically scattered 148 keV photons and the recoil electrons generated within thin Al and Cu foils. We have analyzed both the Doppler broadening of the scattered photon intensity and the angular correlation of the recoil electron. This corresponds to different scans through the three-dimensional electron momentum density of the target. Estimates of the triple-differential cross-section for Compton scattering are given. The experiment was per-formed with synchrotron radiation from a bending magnet of the DORIS storage ring at DESY, Hamburg. 
  Reference    Z. Naturforsch. 48a, 273—278 (1993); received October 8 1991 
  Published    1993 
  Keywords    Electron momentum densities, Compton scattering, Synchrotron radiation 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0273.pdf 
 Identifier    ZNA-1993-48a-0273 
 Volume    48 
3Author    A. Petcov, A. Kirfel, K. Fischer, Fr KristallographieRequires cookie*
 Abstract    e n s o ria l R e p r e s e n ta tio n o f / ' f o r N b in L ith iu m -n io b a te , L i N b 0 3 Using Synchrotron radiation, the dependence of resonant phenomena (absorption, fluorescence and Raman scattering) on the angle between the polarisation plane of the incident radiation and the polar c-axis in ferroelectric Lithium-niobate, LiNb03, was studied in the vicinity of the Nb K-absorption edge. Applying the "optical theorem", the observed dipolar anisotropics can be explained in terms of the projection of the dipole momentum operator on the polarisation vector of the X-ray photons. 
  Reference    Z. Naturforsch. 43a, 388—390 (1988); received January 22 1988 
  Published    1988 
  Keywords    Synchrotron radiation, X-ray absorption, Anomalous dispersion, Ferroelectricity, LiNb03 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0388.pdf 
 Identifier    ZNA-1988-43a-0388 
 Volume    43 
4Author    L. DobrzyńskiRequires cookie*
 Title    Recent Advances in Compton Scattering  
 Abstract    A review of achievements in the field of Compton spectrometry in the years that elapsed from the last Sagamore meeting (1988) is presented. Some physical problems that have either appeared as new or became clarified are described. Special emphasis is put to the results obtained by means of magnetic Compton scattering. 
  Reference    Z. Naturforsch. 48a, 266—272 (1993); received January 9 1992 
  Published    1993 
  Keywords    Compton scattering, Electron momentum distribution, Synchrotron radiation, Mag-netic materials 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0266.pdf 
 Identifier    ZNA-1993-48a-0266 
 Volume    48 
5Author    W. Altraud, Folkhard*. Daniela, C. Hristm, Ann, W. Erner, G. Eercken, Ernst Knörzer, MichelH J Koch, Erika Mosler, HediN. Emetschek-Gansler, Theobald NemetschekRequires cookie*
 Title    Twisted Fibrils are a Structural Principle in the Assembly of Interstitial Collagens, Chordae Tendineae Included  
 Abstract    X-ray diffraction analysis of connective tissue samples, which contain type I and type III collagen shows that twisted collagen fibrils are a general principle of assembly. The occurrence of twisted fibrils in native wet Chordae tendineae, skin and Aorta is combined with a shorter axial periodicity of about 65 nm. This shorter D period is shown to be directly related to the tilt of the molecules, which have to be curved to build-up twisted fibrils. 
  Reference    Z. Naturforsch. 42c, 1303—1306 (1987); received October 5. 1987 
  Published    1987 
  Keywords    Collagen, Skin, Aorta, Chordae tendineae, X-Ray Diffraction, Synchrotron Radiation 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-1303.pdf 
 Identifier    ZNC-1987-42c-1303 
 Volume    42 
6Author    Y. Waseda, K. Shinoda, K. SugiyamaRequires cookie*
 Abstract    a tio n D is tr ib u tio n o f Z n F e 20 4 a n d C o F e 20 4 S p in e ls F r o m A n o m a lo u s X -R a y S c a tte r in g The distribution of Zn2 + and Co2 + cations in ferrite spinels has been determined by applying anomalous X-ray scattering (AXS) near the K absorption edges of Fe, Co and Zn. The energy dependence of the reflection intensities of ZnFe20 4, detected at the Fe K and Zn K absorption edges, can only be explained when all Zn2+ being allocated to the tetrahedral site formed by oxygens. On the other hand, the results for CoFe20 4 suggest that 78% of Co2+ occupy the octahedral site, and that the present CoFe20 4 sample is classified as inverse spinel, although a partial disorder is included. The usefulness of this AXS method coupled with the common Rietveld analysis was well-recognized by determining the cation distribution even in a system with next neighboring elements of the periodic table. 
  Reference    Z. Naturforsch. 50a, 1199—1204 (1995); received November 6 1995 
  Published    1995 
  Keywords    Anomalous X-ray scattering, Rietveld, Synchrotron radiation, Ferrite, Spinel, ZnFe20 4, CoFe20 4 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-1199.pdf 
 Identifier    ZNA-1995-50a-1199 
 Volume    50 
7Author    Agostina Congiu, Castellano"., Mario Barterib, Antonio Bianconi3, Fabio Bruni3, StefanoDella Longac, Corrado Paolinelli3Requires cookie*
 Title    Conformational Changes Involved in the Switch from Ovalbumin to S-Ovalbumin  
 Abstract    For the first time a comparative study on conformational differences between native oval­ bumin and its heat-stable form, called S-ovalbumin. using small angle x-ray scattering, is reported. To detect a different pathway in the folding mechanism of the two proteins, scatter­ ing m easurements have been performed on ovalbumin and S-ovalbumin denatured with dif­ ferent concentrations o f guanidine hydrochloride, and by heating the proteins at acid pH. The intensity scattering curves provide evidence that the intermediate states in the unfolding process are globular for both proteins while their compactness changes. The reported experi­ mental results suggest that the ovalbumin to S-ovalbumin transformation can be considered a protein-switch triggered by changes in the chemical conditions of the protein environment. Because the conform ational changes are likely to be of functional importance, we infer that the occurrence in vivo o f S-ovalbumin is thus determined by the transformation of oval­ bumin, with a functional role for embryonic development, into a new protein with a dif­ ferent function. 
  Reference    Z. Naturforsch. 51c, 379 (1996); received December 19 1995/February 6 1996 
  Published    1996 
  Keywords    Protein Folding, Conformational Change, Denatured State, Synchrotron Radiation, X-Ray Scattering 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0379.pdf 
 Identifier    ZNC-1996-51c-0379 
 Volume    51 
8Author    Corrado Paolinelli3, M. Ario Barterib, Federico Boffi3, Francesca Forastieri3, Maria Cristina, G. Audianob, StefanoDella Longac, AgostinaCongiu Castellano3Requires cookie*
 Title    Structural Differences of Ovalbumin and S-Ovalbumin Revealed by Denaturing Conditions  
 Abstract    We found, by circular dichroism and Raman spectroscopy measurements, that the second­ ary structure of the native ovalbumin and of its heat-stable form, called S-ovalbumin, is a probe of the structural differences between the two proteins. Small angle X-ray scattering and circular dichroism measurem ents perform ed on the two proteins under denaturing condi­ tions, with different concentrations of guanidine hydrochloride, show the changes of the tertiary and secondary structure and a different pathway in the unfolding process. These experimental data confirm that the conversion of native ovalbumin into S-ovalbumin is irreversible and reveal that the response of the two proteins to the same chemical environ­ ment is different. 
  Reference    Z. Naturforsch. 52c, 645—653 (1997); received February 10/June 20 1997 
  Published    1997 
  Keywords    X-Ray Scattering, Conformational Changes, Protein Folding, Synchrotron Radiation, Circular Dichroism, Protein Structure 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0645.pdf 
 Identifier    ZNC-1997-52c-0645 
 Volume    52