| | 1 | Author
| YuA. Babanov, A. F. Sidorenko, V. R. Shvetsov, M. Bionducci, G. Licheri, G. Navarra, A. L. Ageev, V. V. Vasin | Requires 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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| default:Reihe_A/47/ZNA-1992-47a-1191.pdf | | | | Identifier
| ZNA-1992-47a-1191 | | | | Volume
| 47 | |
| 2 | Author
| F. Bell, Th Tschentscher, J. R. Schneider, A. J. Rollason | Requires 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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| default:Reihe_A/48/ZNA-1993-48a-0273.pdf | | | | Identifier
| ZNA-1993-48a-0273 | | | | Volume
| 48 | |
| 3 | Author
| A. Petcov, A. Kirfel, K. Fischer, Fr Kristallographie | Requires cookie* | | | Title
| T | | | | 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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| default:Reihe_A/43/ZNA-1988-43a-0388.pdf | | | | Identifier
| ZNA-1988-43a-0388 | | | | Volume
| 43 | |
| 5 | Author
| W. Altraud, Folkhard*. Daniela, C. Hristm, Ann, W. Erner, G. Eercken, Ernst Knörzer, MichelH J Koch, Erika Mosler, HediN. Emetschek-Gansler, Theobald Nemetschek | Requires 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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| default:Reihe_C/42/ZNC-1987-42c-1303.pdf | | | | Identifier
| ZNC-1987-42c-1303 | | | | Volume
| 42 | |
| 6 | Author
| Y. Waseda, K. Shinoda, K. Sugiyama | Requires cookie* | | | Title
| C | | | | 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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| default:Reihe_A/50/ZNA-1995-50a-1199.pdf | | | | Identifier
| ZNA-1995-50a-1199 | | | | Volume
| 50 | |
| 7 | Author
| Agostina Congiu, Castellano"., Mario Barterib, Antonio Bianconi3, Fabio Bruni3, StefanoDella Longac, Corrado Paolinelli3 | Requires 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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| default:Reihe_C/51/ZNC-1996-51c-0379.pdf | | | | Identifier
| ZNC-1996-51c-0379 | | | | Volume
| 51 | |
| 8 | Author
| Corrado Paolinelli3, M. Ario Barterib, Federico Boffi3, Francesca Forastieri3, Maria Cristina, G. Audianob, StefanoDella Longac, AgostinaCongiu Castellano3 | Requires 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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| default:Reihe_C/52/ZNC-1997-52c-0645.pdf | | | | Identifier
| ZNC-1997-52c-0645 | | | | Volume
| 52 | |
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