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1Author    Thomas WiederRequires cookie*
 Title    A Generalized Debye Scattering Formula and the Hankel Transform  
 Abstract    The diffracted intensity of an x-ray or neutron diffraction experiment is expressed as an integral over an atomic position distribution function. A generalized Debye scattering formula results. Since this distribution function is expanded into a series of spherical harmonics, an inverse Hankel transform of the intensity allows the calculation of the expansion coefficients which describe the atomic arrangement completely. The connections between the generalized Debye scattering formula and the original Debye formula as well as the Laue scattering formula are derived. 
  Reference    Z. Naturforsch. 54a, 124—130 (1999); received December 15 1998 
  Published    1999 
  Keywords    X-ray Scattering, Debye Formula, Hankel Transform 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0124.pdf 
 Identifier    ZNA-1999-54a-0124 
 Volume    54 
2Author    Z. NaturforschRequires cookie*
 Title    A Neutron and X-ray Diffraction Study of the Structure of Nd Phosphate Glasses  
 Abstract    Diffraction experiments were performed on two (Nd203)x(P205)i_ x glasses for studying the en­ vironmental order of the Nd3+ cations. In case of the metaphosphate glass (x = 0.25) a combination of X-ray and neutron diffraction data was used to separate the N d-0 and 0 -0 first neighbor peaks. An N d-0 coordination number of 6.6±0.3 and a mean N d-0 distance of (0.239±0.001) nm were determined. In the ultraphosphate glass studied (x = 0.20) these values increase to 6.9±0.3 and (0.240±0.001) nm where the N d-0 coordination number is equal to the number of terminal oxygen atoms (0 T) which are available for coordination of each Nd3+ cation. This indicates the formation of NdOn polyhedra not sharing any O atom where also all 0 T's are in N d-0T-P positions. In the metaphosphate glass the NdO" polyhedra have to share some 0 T sites. 
  Reference    Z. Naturforsch. 56a, 237—243 (2001); received January 8 2001 
  Published    2001 
  Keywords    Neutron Scattering, X-ray Scattering, Short-range Order, Phosphate Glasses 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0237.pdf 
 Identifier    ZNA-2001-56a-0237 
 Volume    56 
3Author    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 
4Author    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 
5Author    Walter Hoyer, Hartmut Neumann, Manfred WobstRequires cookie*
 Title    Structure Investigation on Liquid Tellurium by X-Ray and Neutron Scattering  
 Abstract    We present the results of neutron and X-ray scattering experiments on liquid tellurium. No dependence on temperature of the radius and the coordination number of the first neighbour shell has been found in the temperature range between 460 °C and 550 °C. We investigate the influence of the truncation of the Fourier transformation on the determined coordination number of nearest neighbours and on the shape of the second coordination maximum at both, the lower and upper integration limit. The structure of liquid tellurium can be described in terms of a chain-like atomic arrangement with two bonds per atom. 
  Reference    Z. Naturforsch. 47a, 833—840 (1992); received May 8 1992 
  Published    1992 
  Keywords    Neutron scattering, X-ray scattering, Short-range order, Liquid tellurium, Termination effect 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0833.pdf 
 Identifier    ZNA-1992-47a-0833 
 Volume    47 
6Author    Hartmut Neumann, Walter Hoyer, Manfred WobstRequires cookie*
 Title      
 Abstract    From neutron and X-ray diffraction investigations on liquid Ge15Te85, Sn16Te84 and Pb14 5Te85 5 alloys the coordination numbers and nearest neighbour distances of these systems are obtained. The partial structure factors and partial pair correlations reveal that the short-range order of the eutectic Ge-Te melt differs from that of the eutectic Sn-Te and Pb-Te melts. 
  Reference    Z. Naturforsch. 46a, 739 (1991); received June 19 1991 
  Published    1991 
  Keywords    Neutron scattering, X-ray scattering, short-range order, liquid alloys, eutectic Ge-Te, Sn-Te and Pb-Te melts 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0739.pdf 
 Identifier    ZNA-1991-46a-0739 
 Volume    46