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  • Artikel: DFG Deutsche Nationallizenzen  (21)
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  • Artikel: DFG Deutsche Nationallizenzen  (21)
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  • 11
    Digitale Medien
    Digitale Medien
    Evaluation of single-crystal X-ray diffraction data from a position-sensitive detector (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 916-924 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A Fortran program has been developed for the reduction of single-crystal diffraction data from a sequence of adjacent rotation pictures recorded at a fixed X-ray wavelength by an electronic area detector. The electronic pictures (data frames) covering the first 5° of crystal rotation are used to locate strong diffraction spots and to estimate the background. The orientation of the crystal is derived automatically from the list of observed spots and all parameters describing the diffraction pattern are refined. The only input required from the user is the specification of the space group, approximate cell dimensions and detector setting. When the initialization step is finished the program goes back to the first picture and evaluates all data frames in the order they arrive from the measurement. Each element of an electronic picture (pixel) is labelled by the indices of the nearest reflection using the current refined parameters describing the diffraction geometry. If the pixels close to its nearest reflection the counts contribute to the three-dimensional profile; otherwise the counts are used to update the background. Each profile is represented as if the reflection had followed the shortest path through the Ewald sphere and had been recorded on the surface of the sphere. Reflections close to the Ewald sphere are kept in a hash table to allow rapid access for updating the profiles. Reflections which have completely passed through the Ewald sphere are removed from the table and saved for further processing. Intensities are estimated by fitting their profiles to an average shape learned from strong neighbouring reflections. Smoothly varying scaling factors are applied to the Lp-corrected intensities which minimize discrepancies between symmetry-related reflections and fit to a reference data set if available.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889888007903
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  • 12
    Digitale Medien
    Digitale Medien
    A discussion of the solution for the best rotation to relate two sets of vectors (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 827-828 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: A method is discussed for obtaining the best proper rotation to relate two sets of vectors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739478001680
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  • 13
    Digitale Medien
    Digitale Medien
    Crystallization and preliminary X-ray structure analysis of thermally unstable p21H−ras guanosine complexes (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 521-526 
    Details
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: p21 is a small guanine nucleotide binding protein that is involved in intracellular signal transduction. Biochemical data suggest that the presence of the β-phosphate is essential for strong binding of guanine nucleotides to the protein. Guanosine or GMP bind six orders of magnitude more weakly to p21 than GDP or GTP. Moreover, the thermal stability of the protein is dramatically reduced when bound to GMP or guanosine. We have crystallized C-terminally truncated forms of p21H-ras, with guanosine or GMP bound, in the space groups P43212, P21212 and P21. The crystals diffract in the range 2.8–2.2 Å. Details of the crystallization procedures, the characterization of the crystals and preliminary results of structure determination are described. An unexpected electron-density peak was found close to the position of the β-phosphate in the phosphate-binding loop.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0907444994001253
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  • 14
    Digitale Medien
    Digitale Medien
    A pattern-recognition procedure for scanning oscillation films: a correction (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 56-56 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Equation (11) of Kabsch [J. Appl. Cryst. (1977). 10, 426–429] should be replaced by Rcalc = F(− z2 − 2z/λ)1/2/(z + 1/λ) = F(x2 + y2)1/2/(z + 1/λ). (11)
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889878012674
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  • 15
    Digitale Medien
    Digitale Medien
    A pattern-recognition procedure for scanning oscillation films (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 10 (1977), S. 426-429 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A pattern-recognition procedure has been developed which directly locates and integrates all diffraction spots on a given oscillation film. Indexing of all identified spots is carried out subsequently, together with the refinement of the relevant parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889877013892
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  • 16
    Digitale Medien
    Digitale Medien
    Automatic indexing of rotation diffraction patterns (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 67-72 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method is described which assigns indices to a set of single-crystal reflections recorded by the rotation-oscillation technique using a fixed X-ray wavelength. It is assumed that the space group and approximate unit-cell parameters are known. The unknown crystal orientation is determined directly from the observed diffraction pattern of one or several oscillation data records. A local indexing procedure is described which tolerates large initial errors in the parameters controlling the diffraction pattern. These parameters are refined subsequently, thereby satisfying the constraints imposed by the space-group symmetry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887009737
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  • 17
    Digitale Medien
    Digitale Medien
    Structure of the detoxification catalyst mercuric ion reductase from Bacillus sp. strain RC607 (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 168-172 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The three-dimensional structure of MerA from Bacillus sp. strain RC607 can be clearly divided into three parts: the two N-terminal regions (residues 1-166), the core (167-616), the equivalent of the glutathione reductase structure, and the C-terminal extension (residues 617-631). This partition is ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/352168a0
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  • 18
    Digitale Medien
    Digitale Medien
    The rotation method in crystallography edited by U. W. Arndt and A. J. Wonacott (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 1049-1050 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740878004896
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  • 19
    Digitale Medien
    Digitale Medien
    A solution for the best rotation to relate two sets of vectors (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 922-923 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: A simple procedure is derived which determines a best rotation of a given vector set into a second vector set by minimizing the weighted sum of squared deviations. The method is generalized for any given metric constraint on the transformation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739476001873
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  • 20
    Digitale Medien
    Digitale Medien
    Spin assignment for the 4.28 MeV level in48Ca by means of the48Ca (p, p′γ) reaction (1970)
    Springer
    The European physical journal 231 (1970), S. 468-474 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The gamma decay mode and the possible spin values of the second excited state of48Ca (E x =4.28 MeV) were investigated by studying the48Ca(p, p′γ) reaction at an incident proton energy of 10.30 MeV. No ground state gamma transition was observed. The analysis of thep 2 -γ angular correlation — using method II of Litherland and Ferguson — supports the spin assignmentI=0 for this level and excludes all spin values higher thanI=1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01642536
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