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1

Digitale Medien

Design criteria for a laboratory EXAFS facility (1981)

Georgopoulos, P. ; Knapp, G. S.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 3-7

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: There has recently been an increased amount of interest in laboratory equipment for extended X-ray absorption fine-structure (EXAFS) measurements. In an earlier paper a facility for performing such measurements easily in a few hours was described in some detail. In this paper, further development of the techniques is reported. The use of high-power rotating-anode X-ray generator, the design of an X-ray curved-crystal spectrometer, the factors governing the proper choice of monochromator crystals and the design of fast-counting detectors and electronics are discussed. In addition, it is shown how errors caused by characteristic lines in the spectrum can be eliminated by use of a flux stabilization circuit.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008571

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2

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Neutron photographic measurements of protein single-crystal reflections (1981)

Hohlwein, D. ; Mason, S. A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 24-27

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Photographic neutron intensity measurements on a 2 mm3 single-crystal of triclinic lysozyme are compared with conventional neutron diffractometer data. The reflections were recorded with the oscillation technique. The structure factors were derived from the optical densities scanned by an automatic microdensitometer and processed by computer programs. A statistical analysis shows that the photographic data are of about the same accuracy as recently collected diffractometer data. For the same flux and crystal volume the data collection time is reduced by up to two orders of magnitude.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008601

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3

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A device for accurate single-crystal X-ray diffraction investigations at non-ambient temperatures: 83–1120 K (1981)

Hong, S. H. ; Åsbrink, S.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 43-50

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A device is described which uses liquid nitrogen to generate a cold or hot gas stream which is blown directly onto the crystal mounted on an X-ray diffractometer. With a specially constructed high-vacuum (〈 1.3 × 10–5 Pa) jacketed silica Dewar tube, it can operate between 83 and 1120 K with a stability over long time periods of ± ¼ K below and ± 1 K above ambient temperature. In the latter case the short-time stability is ± ¼ K for hours. It gives an inert atmosphere at elevated temperatures and allows extensive data collection for the accurate determination of crystal structures. The evaporator, the automatic refilling system and the silica Dewar tube are described.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008649

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4

Digitale Medien

A fitting method for X-ray diffraction profiles (1981)

Hecq, M.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 60-61

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A fitting method is proposed for X-ray diffraction profiles which requires only a small number of parameters.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008686

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5

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Crystal data for two series of solid solutions: (RbxK1−x)MgCr2(VO4)3 and (TlxK1−x)MgCr2(VO4)3 (1981)

Nabar, M. A. ; Phanasgaonkar, D. S.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 61-62

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Complete solid solution is observed amongst the compounds of the type M1MgCr2(VO4)3 (where M1 = K, Rb or Tl). The solid-solution series obtained show linear changes in peak positions and peak intensities in their X-ray diffraction patterns. The crystallographic behaviour with respect to the value of x for (RbxK1−xMgCr2(VO4)3 and (TlxK1−x)MgCr2(VO4)3 solid solutions is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008698

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6

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Crystal data for ferric molybdate: Fe2(MoO4)3 (1981)

Massarotti, V. ; Flor, G. ; Marini, A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 64-65

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Indexed powder patterns of the monoclinic phase, stable at room temperature, and of the orthorhombic phase, stable for T 〉 786 K, are given. The cell dimensions are: a = 15.737 (8), b = 9.231 (5), c = 18.224 (9) Å, β = 125.46 (2)° at 295 K; a = 9.330 (3), b = 12.868 (5), c = 9.242 (3) Å at 818.6 K. Linear equations describing the thermal expansion of the two phases of ferric molybdate are reported. To verify if ferric molybdate can incorporate excess MoO3, measurements on non-stoichiometric samples were also made: no evidence of the presence of excess MoO3 was found.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008716

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7

Digitale Medien

Crystal data for high-temperature As2O5 (1981)

Barten, H.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 68-68

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: High-temperature As2O5 at 768 ± 5 K is tetragonal with a = 8.577 (1), c = 4.637 (1) Å, V = 341.2 Å3, Z = 4, Dc = 4.475 Mg m−3. Indexed powder data are given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100873X

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8

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Characteristics of a flat multiwire area detector for protein crystallography (1981)

Hamlin, R. ; Cork, C. ; Howard, A. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 85-93

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A flat, relatively thin (9 mm) xenon-filled multiwire proportional counter with two-dimensional, 2 μs delay line readout of a 270 × 300 mm active area has been developed for use as a position-sensitive area X-ray detector in the 8 keV energy region (Cu Kα) used in crystallographic structure work with large biological molecules. Its quantum detection efficiency for 8 keV X-ray photons is about 0.5, a value which is spatially uniform to within ± 2%. Its dead-time loss fraction at a typical data collection rate of 30000 photons s−1 is 12%. The detector has spatial resolution for X-rays of 0.6 mm FWHM in the horizontal direction and 2 mm, the anode wire spacing, in the vertical direction. The effects of parallax are found to be limited and do not seriously increase the apparent size of the diffracted beams. The position sensitivity of this detector is geometrically linear to within 0.5 mm across its active surface. Routine maintenance of the detector requires the attention of a skilled technician but is not time consuming. For four years, this detector has been used to measure millions of reflection intensities from crystals of many different proteins. The down time due to the detector has averaged less than four days per year, considerably less than the down time of other components of the data collection system. Four new protein structures have now been solved using data from this detector. Also, a considerable amount of data have been collected at higher resolution or at different temperatures with crystals of other proteins.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008856

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9

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An assessment of instrumental parameters which control the accuracy of stress measurement using the X-ray diffractometer method (1981)

Doig, P. ; Lonsdale, D. ; Flewitt, P. E. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 124-130

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The sources of systematic error in the X-ray diffractometer method of stress measurement are discussed. The errors in stress measurement and correction procedures for their elimination are described and quantitatively assessed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100890X

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10

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The use of cell and symmetry information for single-crystal orientation on diffractometers (1981)

Le Page, Y. ; Gabe, E. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 117-123

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The diffraction aspect and rough cell parameters of a crystal to be studied are usually known before mounting the crystal on a diffractometer. Such data are used for orientation purposes in the method described. An ordered list of indexed 2θ values is calculated from which an optimum 2θ for a peak search is derived. The peaks found are centered, their possible unique indices are derived by comparison of the observed 2θ values with the calculated values. Two intense reflections with few indexing ambiguities are selected to define the crystal orientation. Their possible pairs of indices are found by considering combinations of indices related to the unique indices by the Laue-group symmetry and for which the calculated angle between the reciprocal vectors is comparable with the observed angle. Only the non-equivalent orientations defined by these initial pairs will be accepted. An initial pair will be rejected if the indices of both reflections can be transformed into those of a previously accepted pair by a single Laue-group symmetry operator of the first kind. The correct setting is usually obvious from a very short list of possible orientations and is retained. This simple approach has been programmed and treats all symmetries without branching of the logic. Rhombohedral crystals can be referred to hR or rP cells. The possible non-equivalent settings due to metric ambiguities, to pseudo-symmetry or to symmetry are exhaustively listed, but no symmetry-related setting is indicated. This scheme has automatically oriented more than 40 crystals from the seven crystal systems in 20–50 min each. The wavelength, the cell parameters and the short symbol of a valid space group in the correct diffraction aspect are the only input.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008893

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11

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Neutron powder diffraction of forsterite, Mg2SiO4: a comparison with single-crystal investigations (1981)

Lager, G. A. ; Ross, F. K. ; Rotella, F. J. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 137-139

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Neutron time-of-flight powder data have been collected for forsterite [Mg2SiO4; Pbnm (D162h, No. 62); Z = 4, a = 4.7534 (1), b = 10.1989 (2), c = 5.9813 (1) Å] with the ZING-P′ high-resolution diffractometer at Argonne National Laboratory. Forty-seven variables, including anisotropic temperature-factor coefficients, were refined with a profile-fitting procedure to R(profile) = 2.10% and R(Rietveld) = 3.53%. Positional and thermal parameters are in good agreement with those determined from recent X-ray and neutron single-crystal diffraction experiments. Results suggest that powder data can be used to obtain accurate positional parameters and reasonable temperature factors for moderately complex structures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008935

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12

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Adaptation of a Kratky camera to use with a one-dimensional position-sensitive detector (1981)

Roe, R. J. ; Chang, J. C. ; Fishkis, M. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 139-141

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A Kratky small-angle X-ray camera was modified so as to allow the use of a one-dimensional (one-dimensional) position-sensitive detector (PSD) with it. The modification was designed in such a way that most of the calibrations, necessary for subsequent correction of the collected intensity data, can be performed with little alteration in the collimation geometry or the electronics settings. In particular, the calibration of the uniformity of detector efficiency can be performed by repeated vertical travel of the detector at a constant speed across a beam scattered from a sample.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008947

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13

Digitale Medien

XPKFIT: peak separation with arbitrary relations among the component peaks (1981)

Hayakawa, M. ; Oka, M.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 145-148

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A computer program for the separation of a composite peak into the components and the background has been written in Fortran. Each component is approximated by a function of the form y(x) = c [1 + ({{x - d}\over{e}})^{2}]^{-f}, where c, d, e and f are the parameters to be determined by a least-squares method. Arbitrary, known or assumed relations among the parameters of different components may be read in to reduce the number of independent parameters and save computation time or, in other cases, to offer a better chance of separating a complex composite peak by varying a subset of the parameters.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881008984

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14

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BLOKJE, a computer program to calculate the domain of an atom in a structure (1981)

Gelato, L.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 151-153

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A computer program has been written with the aim of calculating the domain of an atom in a structure. The domain may be limited by planes situated half-way between the atoms, or at a distance that takes into account the relative radii of the atoms. Data concerning this domain and the corresponding coordination polyhedron are computed and printed. Punched cards, to be used in a special plotting program, can also be produced. Three types of weighted coordination number are calculated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100900X

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15

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The use of continuous diffraction data as a phase constraint. I. One-dimensional theory (1981)

Makowski, L.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 160-168

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Intensity can often be measured as a continuous function of scattering angle in diffraction from non-crystalline specimens. An analysis of the amount of information contained in one-dimensional continuous diffraction data is presented here. This analysis, based on the sampling theorem and the theory of entire functions, indicates that there is a limited but often rather large number of possible phase solutions to any given continuous intensity distribution. A refinement technique has been developed which allows phase solutions to be found that are consistent with the diffraction data and with other physical and chemical data. In favourable cases, when diffraction data is used in coordination with other kinds of data, there can be enough information in a diffraction pattern to identify a unique structural solution.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009060

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16

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The small-angle neutron scattering spectrometer at the University of Missouri research reactor (1981)

Mildner, D. F. R. ; Berliner, R. ; Pringle, O. A. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 370-382

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A small-angle neutron scattering (SANS) spectrometer has been constructed at the University of Missouri Research Reactor Facility (MURR). The design of the MURR–SANS is unusual in that the size of the reactor containment building constrains the flight path to be vertical. This is achieved by Bragg scattering upward through 90° from a set of slightly misaligned pyrolytic graphite crystals to provide a neutron beam at 4.75 Å with a wavelength spread of approximately 4.1%. The beam incident on the sample is defined by two matched variable apertures located either 3.0 or 4.5 m apart. The evacuated scattered flight path is designed with removable extensions to match the primary flight path in length. The instrument has an automatic sample handling capability provided by its own dedicated PDP 11/03 computer. The detector is a large assembly of commercially available linear 3He detectors as an economic alternative to a crossed-wire two-dimensional multi-detector. An array of 43 position-sensitive proportional counters, 24 in (609.6 mm) long and 0.5 in (12.7 mm) in diameter, using charge division gives a spatial resolution of 5 x 12.7 mm. The area-averaged detector efficiency is about 84% at a wavelength of 4.75 Å. The range of scattering vectors that can be measured is 0.005 〈 Q〈 0.15 Å−1. The instrument is well suited to a wide variety of experiments on specimens having characteristic dimensions between 20 and 500 Å. MURR–SANS is designed as a user-oriented facility which provides both reasonable resolution and intensity on sample at a modest cost, and forms part of a neutron scattering center.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009631

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17

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A study of the ordered structures of the Au–Mn system by high-voltage–high-resolution electron microscopy. II. Two-dimensional antiphase structures based on the DO22 structure (1981)

Terasaki, O. ; Watanabe, D. ; Hiraga, K. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 392-400

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Two-dimensional antiphase domain structures existing in the composition range 20–23 at.% Mn were investigated by a high-resolution structure-imaging technique with a 1 MV electron microscope. The structures are based on the DO22 structure and consist of parallelogram-shaped domains containing 4 × 3 columns of Mn atoms and lozenge-shaped domains with 4 × 4 and 3 × 3 columns, and the domains are separated by two-dimensional antiphase boundaries parallel to the ({\bar 2}40) and (240) planes of the fundamental face-centred structure. The configuration of the domains changes delicately with a slight change of composition or annealing temperature, and the symmetry of the structure is lowered below about 670 K. The ideal structure models have compositions of about 22.7 at.% Mn. The images of about half of the specimen area of the 22.6 at.% Mn alloy annealed at 570 K do not correspond to these new structures, but bear a resemblance to the image expected from the two-dimensional antiphase structure proposed by Watanabe [J. Phys. Soc. Jpn (1960), 15, 1030–1040] for Au3Mn, which is based on the L12 structure and has boundaries parallel to the (100) and (010) planes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009667

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18

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Comparison of two numerical methods for the integration of the Takagi–Taupin equations (1981)

Nourtier, C. ; Taupin, D.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 432-436

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Two methods for the numerical resolution of the Takagi-Taupin equations are compared. It is shown that for a small integration step Taupin's [Acta Cryst. (1967), 23, 25–35] extension to two dimensions of the one-dimensional Runge–Kutta third-order method is more accurate than the algorithm of Authier, Malgrange & Tournarie [Acta Cryst. (1968), A24, 126–136] but, for a given precision, Authier, Malgrange & Tournarie's method is faster than Taupin's so the former will usually be preferred for numerical calculation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009709

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19

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Dependence of cooling rate of SAXS spectra from a B2O3–PbO–Al2O3 glass (1981)

Craievich, A. F. ; Olivieri, J. R.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 444-446

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The phase separation of an 80% B2O3–15% PbO–5% Al2O3 (weight %) glass after splat-cooling was studied by small-angle X-ray scattering. The wavenumber which receives maximal amplification and the scattering intensity corresponding to this wavenumber were determined as a function of the cooling rate of the glass. The experimental results qualitatively agree with the main features of previous calculations based on the linear theory of spinodal decomposition, but no quantitative agreement is obtained.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009734

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20

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Phase assignment to diffraction patterns based on the analytic properties of scattered fields applied to the structure of nerve myelin (1981)

Burge, R. E. ; Fiddy, M. A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 455-461

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: An analysis of published X-ray diffraction data from nerve myelin is given based on the properties of analytic functions. Functions defined by a finite Fourier transform may be described by their distribution of zeros. This description allows a phase function to be determined from real data, which is unique in principle. A solution to the phase assignment is given and compared with corresponding published solutions derived by other methods. The strong measure of agreement for the phases of the first nine diffraction orders, and the stability of this agreement against the efforts of experimental error, leads to the conclusion that these phases are probably correct.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100976X

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21

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Crystal data for [2.1.2.1]paracyclophan C30H28 (1981)

Ghemard, G. ; Souleau, C. ; Sergheraert, S. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 465-465

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The powder data for [2.1.2.1]paracyclophan is reported. This compound is monoclinic with a = 21.44 (4), b = 17.22 (6), c = 9.70 (4) Å, γ = 141.30 (3)°, Z = 4.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009795

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Report of Executive Committee for 1980 (1981)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 491-491

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100993X

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A simple procedure for fitting a backgound to a certain class of measured spectra (1981)

Steenstrup, S.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 226-229

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A numerical procedure using orthogonal polynomials is used for extracting the background in measured spectra. An X-ray spectrum obtained with the energy-dispersive method is considered as an example.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009242

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Refraction corrections to the diffractometer angles of centered reflections from extended-face single crystals (1981)

McIntyre, G. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 247-252

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The effect of refraction on the observed diffractometer angles θr, ωr and χr of a centered reflection is discussed for general asymmetric reflection from a finitely absorbing extended-face crystal. Formulae are presented for θr, ωr and χr for symmetric reflection and for θr and ωr for the two extreme positions of asymmetric reflection in terms of the angles calculated assuming that refraction can be neglected.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009291

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Complete determination of subgrain misorientation by an X-ray topographic method (1981)

Kulda, J. ; Polcarová, M.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 265-269

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A modification of the Berg-Barrett X-ray topographic method was developed which enables measurement of all three misorientation parameters of a general subgrain boundary. The described method is based on the evaluation of three topographs of a single, arbitrarily oriented crystal surface taken by symmetric zero-layer reflections. In practical tests performed on an as-grown Fe–3 Wt% Si single crystal, relative accuracy of 10% and angular sensitivity better than 1′ were achieved.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009333

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An interactive graphics system for comparing the model building of macromolecules (1981)

Brandenburg, N. P. ; Dempsey, S. ; Dijkstra, B. W. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 274-279

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: An interactive graphics program is described for use with the Evans & Sutherland Picture System 2 which is suitable for the comparison and refinement of protein structures. Several protein molecules and electron density maps can be viewed simultaneously, while great flexibility exists in creating, modifying and manipulating the picture on the screen. As the program is file oriented, it can be run on a small computer system with only 32 K memory.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009357

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Anomalous thermal expansion of silver gallium telluride (1981)

Kistaiah, P. ; Venudhar, Y. C. ; Sathyanarayana Murthy, K. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 281-284

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A precise X-ray determination of the lattice parameters of silver gallium telluride, AgGaTe2, has been made in the temperature range 301 to 667 K with a Unicam 190 mm high-temperature powder camera. The data have been used to evaluate the coefficients of thermal expansion, α⊥ and α\parallel, at various temperatures. It has been observed that the `c' parameter decreases while the `a' parameter increases with increasing temperature as in the case of AgGaSe2 and AgGaS2, which also have a chalcopyrite-type structure. The magnitudes of both α⊥ and α\parallel increase non-linearly with increasing temperature.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009382

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X-ray extinction contrast in deformed single crystals (1981)

Fries, E. ; Spendel, M. ; Philibert, J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 285-290

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Berg–Barrett topography gives information on large-scale dislocation distribution in deformed single crystals. The Burgers vectors are determined by disappearance of the dark `extinction contrast'. This contrast cannot be extinguished by any single diffracting condition when different types of non-coplanar Burgers vectors are present simultaneously; complementary information by electron transmission microscopy agrees well with this inference. These general remarks are illustrated by some examples on deformed single crystals of α-Al2O3, (Al2O3)1.8MgO, NaCl and Cu2O.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009394

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Diffraction by layer structures containing different kinds of layers and stacking faults (1981)

Plançon, A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 300-304

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A description is given of a mathematical formalism which allows the study of diffraction by stacks which contain, simultaneously or not, (i) layers of different kinds, (ii) different translations or rotations between layers and (iii) different thicknesses. The formalism allows the calculation of intensities for all the hkl reflections or (h,k) reciprocal rods, and not just the 00l reflections. It accounts for an Sth-neighbour interaction (S≥1).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009424

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A pilot study of the use and unfocused monochromatic radiation from a storage ring in powder diffraction (1981)

Thompson, P. ; Glazer, A. M. ; Albinati, A. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 315-320

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The results of a trial powder diffraction experiment on the ADONE storage ring at the Frascati National Laboratories (Italy) are described. A (220) channel-cut Si crystal was used to provide a monochromatic beam and it was demonstrated that Debye–Scherrer photographs could be obtained in several hours. It was also shown that very high resolution can be obtained simply by increasing the camera dimensions. Finally, it is shown that with the higher fluxes of the SRS at the Daresbury Laboratory (England) very fast exposures will be possible without the need for focusing.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S002188988100945X

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Modulated structure of iron–carbon martensite studied by electron microscopy and diffraction (1981)

Kusunoki, M. ; Nagakura, S.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 329-336

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Satellite spots appear around every fundamental spot in electron diffraction patterns of iron-carbon martensite (α′) tempered in a temperature range from 273 to 363 K. High-resolution electron microscopic observations show that they are due to the formation of a modulated structure, in which interstitial carbon atom clusters smaller than 10 Å are distributed randomly in a plane nearly parallel to (102)α′, with inter-cluster distance of 10–20 Å and such carbon-rich planar regions are spaced periodically with intervals of 10–20 Å, depending on the carbon content of the martensite. A structure analysis was made by measuring the satellite spot intensity of the electron diffraction patterns, and the displacements of atoms from their average positions in martensite were determined. The result supports the above cluster model for the modulated structure.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009485

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Crystal data for the double oxides MSbO4 (M=Cr, Fe) (1981)

Amador, J. ; Rasines, I.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 348-349

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: MSbO4, (M = Cr, Fe) are tetragonal, rutile-type compounds, P42/mnm (No. 136); Z = 1. M and Sb are randomly distributed in 2(a) positions and O in 4(f). For CrSbO4, Dm = 5.31, Dx = 5.35 Mg m−1, a = 4.5899 (2), c = 3.0525 (2) Å, U = 64.307 (8) Å3, x = 0.318, R = 4.6; Cr and Sb are coordinated with two O atoms at 2.064 and four O atoms at 1.930 Å.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009515

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The fabrication of a dual-element X-ray divergent-beam target (1981)

Schutz, R. J. ; Weissmann, S. ; Yaniero, J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 352-353

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009540

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World Directory of Crystallographers, Sixth Edition (1981)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 354-354

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009576

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Laser crystals edited by A. A. Kaminskii (1981)

Kvapil, J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 355-356

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009606

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Crystal data for the oxidation product of bis(2,2'-bipyridyl)copper(I) perchlorate in nitroalkanes (1981)

Garland, M. T. ; Spodine, E. ; Zamudio, W.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 475-477

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Single crystals of [Cu(bpy)2NO2]ClO4, [Cu(C10H8N2)2NO2]ClO4, C20H16CuN5O2.ClO4, with space group P21/c, were grown from the reacting mixture of bis(2,2′-bipyridyl)copper(I) perchlorate with molecular oxygen in nitroalkanes. The unit-cell parameters are a = 10.83 (2), b = 12.51 (1), c = 17.04 (1) Å, β = 112.0 (2)°, Z = 4, Dm = 1.62 (1) Mg m−3.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009862

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Crystal data for the decavanadates of 2,4-, 3,4-, and 3,5- dimethylpyridine and 2,4,6-trimethylpyridine (1981)

Arrieta, J. M. ; Amigó, J. M. ; Gili, P.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 472-473

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Indexed powder patterns of four monoclinic compounds of general formula (BH)3H3V10O28 .xH2O, where x = 1-2.5 and B = 2,4-dimethylpyridine (J8), (C7H10N)3H3V10O28.1.0H2O, 3,4-dimethylpyridine (J10), (C7H10N)3H3V10O28.1.0H2O, 3,5-dimethylpyridine (J11), (C7H10N)3H3V10O28.2.5H2O, and 2,4,6-trimethylpyridine (J12), (C8H12N)3H3V10O28.1.0H2O are given. The cell dimensions of the unit cells with two molecules are: J8 a = 18.360 (2), b = 10.438 (2), c = 13.503 (2) Å, β = 95.99 (1)°; J10 a = 12.538 (3), b = 13.634 (5), c = 16.662 (5) Å, β = 111.82 (2)°; J11 a = 19.483 (5), b = 10.711 (2), c = 13.020 (4) Å, β = 101.52 (2)°; J12 a = 12.776 (3), b = 22.470 (4), c = 11.790 (3) Å, β = 91.54 (1)°.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009849

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The XIIth Congress of the IUCr, Ottawa, August 1981. An informal report (1981)

Robertson, J. H.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 487-489

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009898

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Crystallographers (1981)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 490-490

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009916

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Notes and News (1981)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 14 (1981), S. 491-492

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889881009941

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A new routine for thinning, editing and fitting MIR maps using real-space molecular dynamics (1993)

Levitt, D. G. ; Banaszak, L. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 736-745

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A new routine has been developed for fitting multiple isomorphous replacement (MIR) maps. The map is first thinned and reduced to a series of `traces'. Each trace consists of a main trace of defined length and a series of branching side traces. Using this trace representation, the entire map can be viewed at one time and the major secondary structural features can be recognized. A number of features have been built into the routine for editing these traces, allowing neighboring traces to be connected and incorrect connections to be broken. After the traces have been edited, a polyserine fit is generated. The traces are used to guide the initial positioning of a short polyserine segment. This segment is then refined using a real-space molecular-dynamics procedure, which uses the gradient of the electron density as a pseudoforce on the polyserine atoms. After the structure of this initial polyserine has been refined, another serine is added at one end, a short period (about 10 s on a personal Silicon Graphics IRIS workstation) of molecular dynamics is applied and the procedure is repeated. The final refined structure depends only on the electron density and is independent of the thinned traces. The routine is illustrated with two examples. One example uses the 3.0 Å map generated directly from a model protein. This allows direct comparison between the polyserine fit and the model that was used to generate the map. The second example uses the experimental MIR map for lipovitellin. This is a very large protein (about 1300 amino acids), which has a poor-quality map that has not yet been refined. The program makes extensive use of Silicon Graphics graphical (GL) routines.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893003279

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Mathematical crystallography - an introduction to the mathematical foundations of crystallography. Reviews in mineralogy by M. B. Boisen and G. V. Gibbs (1993)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 752-752

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893099492

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Solids far from equilibrium edited by C. Godrèche (1993)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 752-752

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893099480

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The half-widths of Bragg intensity profiles measured with a triple-crystal diffractometer at a synchrotron-radiation source. II. The half-widths of YIG and Si single crystals (1993)

Rossmanith, E. ; Werner, M. ; Kumpat, G. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 756-762

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The practical usefulness of the expressions for the half-width proposed in paper I [Rossmanith (1993). J. Appl. Cryst. 26, 753–755] are demonstrated for three examples: a spherical YIG (yttrium iron garnet) crystal, a spherical silicon crystal and a plane-parallel perfect silicon plate. The new concept for the calculation of the width results in theoretical widths that are in excellent agreement with experimental widths observed in parallel and antiparallel arrangements of the sample with respect to the second monochromator crystal.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893004388

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Automatic processing of rotation diffraction data from crystals of initially unknown symmetry and cell constants (1993)

Kabsch, W.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 795-800

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: An algorithm has been developed for the automatic interpretation of a given set of observed reciprocal-lattice points. It extracts a reduced cell and assigns indices to each reflection by a graph-theoretical implementation of the local indexing method. All possible symmetries of the observed lattice compatible with the metric of the reduced cell are recognized and reported, together with the unit-cell constants and the linear index transformation relating the conventional to the reduced cell. This algorithm has been incorporated into the program XDS [Kabsch (1988). J. Appl. Cryst. 21, 916–924], which is now able to process single-crystal area-detector data without prior knowledge of the symmetry and the unit-cell constants.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893005588

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A direct method of beam-height correction in small-angle X-ray scattering (1993)

Singh, M. A. ; Ghosh, S. S. ; Shannon, R. F.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 787-794

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A direct (i.e. noniterative) method for desmearing the beam-height effect in small-angle X-ray scattering is discussed. The method is applicable to rectangular collimation systems with arbitrary beam-height intensity profiles. The process involves the construction of an upper-triangular matrix of terms containing the resolution information. A straightforward back-substitution process can then be used to determine the ideal pinhole-collimated curve for any experimental curve obtained with the given resolution. The principal advantage of the method lies in its simplicity, which facilitates an examination of the propagation of random errors through the desmearing process. A comparison between the direct method and the iterative approach of Glatter [J. Appl. Cryst. (1974), 7, 147–153] is made to illustrate the efficiency of the technique.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893005527

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Interpretation of the diffuse scattering close to Bragg peaks by X-ray topography (1993)

Fewster, P. F. ; Andrew, N. L.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 812-819

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Perturbations from crystal perfection will result in diffuse X-ray scattering, which can be imaged by topography to yield defect information without the swamping contribution of perfect-crystal scattering. This paper illustrates the importance of the probe shape for obtaining topographic images in this diffuse region not only to aid interpretation but to isolate the contributors to this scattering. The diffuse scattering in the vicinity of the Bragg peaks of GaAs, Si and Ge substrate crystals has been mapped to very high resolution and the diffuse scattering has been imaged by topography. It was found that the majority of the scattering emanates from surface damage and dislocations and not point defects or thermal diffuse scattering (TDS). These latter two components are found to be second-order effects in general and are only just discernable as a very weak background intensity in highly perfect crystals. This topography method is very sensitive to surface damage. This is because the associated diffuse scattering close to a Bragg peak can be used to form an image. Therefore, this relatively intense scattering provides a topograph within a few hours for assessing substrate-surface quality. The sensitivity of the method is illustrated with images of surface defects and dislocations in very perfect semiconductors. A procedure for measuring the diffuse scattering emanating from microdefects is also presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893006259

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Crystallographers (1993)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 846-846

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893010672

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A fast and portable microspectrophotometer for protein crystallography (1993)

Hadfield, A. ; Hajdu, J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 839-842

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: Spectroscopic measurements on crystals during X-ray data collection provide additional information on the composition of the crystal and can be used in the interpretation of structural data. This paper describes a portable microspectrophotometer to obtain UV–visible–near-IR spectra from single crystals during X-ray measurements. The instrument consists of a deuterium lamp, optical fibres, a pair of mirror lenses and a monochromator equipped with a photodiode array detector. Spectra can be recorded in short periods of time (a few milliseconds) from a measurement area of 0.10 mm diameter or smaller. The device can be used to monitor spectral changes in crystals during time-resolved X-ray experiments so that the X-ray camera can be triggered at the right moment as determined by the spectrum, thereby eliminating much of the present guesswork from such studies.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893005552

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New Commercial Products (1993)

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 847-848

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889893099558

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A 109 high-pressure cell for X-ray and optical measurements (1993)

Leszczynski, M. ; Podlasin, S. ; Suski, T.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 1-4

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The construction of a new high-pressure cell is presented. It is a piston-cylinder type of apparatus. The entrance and exit of X-rays or light are possible through two parallel diamond-plate windows placed on V-shaped slits covering almost the whole range of reflection angles. This makes the cell particularly suitable for X-ray diffraction examinations of monocrystals. The potential accuracy of absolute-bulk-modulus determination by lattice-constant measurements using the Bond method [Bond (1960). Acta Cryst. 13, 814–816] at pressures of 108–109 Pa can be estimated at 1–2%. The cell enables the simultaneous examination of two samples, which makes possible the comparison of their compressibilities with an accuracy of 0.01–0.1%. As examples, the results of compressibility measurements on GaAs and GaN are given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892006009

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On the least-squares determination of lattice dimensions: a modified singular value decomposition approach to ill-conditioned cases (1993)

Anselmi-Tamburini, U. ; Spinolo, G.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 5-8

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A modification is described of the singular value decomposition (SVD) method suitable for underdetermined linear least squares (LLS). When a set of data to be fitted is incomplete and does not allow an independent determination of all model parameters, the modified method automatically merges a previously available approximate solution into the LLS results. The solution so produced is more appropriate to the particular problem than the usual SVD solution, while still being a LLS estimate of the whole set of parameters. The method is discussed with reference to the LLS determination of unit-cell dimensions during the step-by-step assignment of h, k, l indices of a diffraction pattern.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892006010

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A data-acquisition system for area detectors (1993)

Schoenborn, B. P. ; Wang, H. ; Kelley, M. A. ; [weitere]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 9-14

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The use of position-sensitive area detectors with high-flux radiation sources demands high-rate data-acquisition systems. Ideally, such devices should be commercially available and machine independent. In this paper, the basic features of such a system are described. The steps are highlighted that determine the counting rates of present-day addressing-logic and computer-bus speeds. The improvements expected with a new industrial standard bus system are briefly described.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892007088

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Computer processing and analysis of X-ray fibre diffraction data (1993)

Lorenz, M. ; Holmes, K. C.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 82-91

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The processing and analysis of fibre diffraction data is often cumbersome. Presented here is a compact interactive computer program, PROFIDA (processing of fibre diffraction data), for fast processing of fibre diffraction data from biological molecules without many of the difficulties. Interactive rotation and centring of the diffraction pattern allow four-quadrant averaging and background subtraction. Furthermore, film coordinates may be transformed into reciprocal-space coordinates for any orientation of the specimen. Specimen tilt towards the incident-beam direction may be determined and the appropriate correction made. In addition, a routine that scales and merges data sets from a film pack is available. Data analysis is supported by an integration routine that allows layer-line profiles to be examined and integrated and layer-line plots to be produced under control of the cursor. The program is written in C to run on the Silicon Graphics Iris workstation with a button-and-dial box using the Iris graphics library.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892008781

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The use of soft X-rays of very long wavelengths for small-angle scattering at the Aladdin storage ring (1993)

Tse, J. S. ; Klug, D. D. ; Yang, B. X.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 130-132

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The feasibility of using soft X-rays from the Aladdin storage ring for small-angle X-ray scattering (SAXS) experiments was demonstrated through the study of the diffraction patterns of polyethylene, paraffin and polystyrene latex spheres using monochromated radiation in the range 4.0–7.1 Å.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892008732

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Microabsorption of scattered X-rays and its dependence on incidence angle in the nonsymmetric reflection case (1993)

Pitschke, W. ; Hermann, H. ; Mattern, N.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 132-134

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The microabsorption of X-rays scattered by isotropic powder samples is studied for nonsymmetric beam geometry including grazing incidence. Experimental results for the absorption effect and its dependence on both the incidence and scattering angles are presented. The absorption behaviour is qualitatively explained by means of a simple surface-roughness model.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892009257

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Cryostat for synchrotron powder diffraction with sample rotation and controlled gas atmosphere in the sample chamber (1993)

Ihringer, J. ; Küster, A.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 135-137

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Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: The cryostat for 8 〈 T 〈 300 K presented here, based on a closed-cycle cryogenic engine, optimizes the powder-grain statistics of the sample by the use of a cold sample spinner working within an open helium-gas atmosphere for thermal contact. The compact design of the cooling stage adapted to the Bragg–Brentano-type diffraction geometry provides for a large open interval, 0 〈 2Θ 〈 180°, of diffraction angles. A wide variety of sample holders allows measurements with plane powder samples and thin films at low temperatures under variable orientation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892009269

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POLISH: computer program for improving the accuracy of structure-factor magnitudes obtained from powder data (1993)

Byrom, P. G. ; Lucas, B. W.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 137-139

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A computer program, POLISH, is presented that improves the accuracy of the structure-factor magnitudes obtained from powder data. This offers a greater likelihood of success for structure determination by direct methods or Patterson techniques. Generally, the program will be used in conjunction with a unit-cell refinement program, but it may also be used independently. Accurate values of the unit-cell and peak-shape parameters are required, which may be conveniently obtained from the unit-cell-refinement program. The program is tested by application to ND4NO3 (V).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892007611

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MACINPLOTII – an updated program to display electron density and atomic models on the Macintosh personal computer (1993)

Smith, T. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 26 (1993), S. 496-498

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ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889892013153

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Structure of 6-(3,3-dimethyl-2-oxo-2,3-dihydro-5-furanyl)-2-pyridone at 145 K (1993)

Maverick, E. ; Chiefari, J. ; Lightner, D. A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 338-340

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ISSN: 1600-5759

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/S0108270192005675

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Structure of [Fe(C16H14ClNO4)(CO)3] (1993)

Wang, J. C. ; Sun, C. H. ; Yang, G. Z. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 381-383

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ISSN: 1600-5759

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/S0108270192009934

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Structure of ethyltriphenylphosphonium triiodide, [P(C2H5)(C6H5)3]I3 (1993)

Bélanger, S. ; Beauchamp, A. L.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 388-391

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ISSN: 1600-5759

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/S010827019200920X

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Structures of (E,E)-o-nitroacetophenone azine (I), (E,Z)-o-nitroacetophenone azine (II) and (E,E)-o-nitrobenzaldehyde azine (III) (1993)

Hsu, L. Y. ; Nordman, C. E. ; Kenny, D. H.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 394-398

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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/S0108270192009685

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Structure of 1,3-xylyl-(18-crown-5)–ammonium catecholborate (1/1) (1993)

Goddard, R. ; Niemeyer, C. M. ; Reetz, M. T.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 402-404

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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/S0108270192010485

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Structure of dibenzofuran-d8, C12D8O, at 173 K (1993)

Fitzgerald, L. J. ; Gallucci, J. C. ; Gerkin, R. E.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 398-400

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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/S0108270192009375

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Structure of a new sodium thiosulfate hydrate (1993)

Hesse, W. ; Leutner, B. ; Böhn, K. H. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 363-365

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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/S0108270192009399

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67

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Structure of [Cu(CN)(py)2] (1993)

Olmstead, M. M. ; Speier, G. ; Szabó, L.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 370-372

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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/S0108270192009326

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Two iron–tricarbonyl complexes with substituted bicyclo[2.2.2]octadienes (1993)

Irngartinger, H. ; Oeser, T. ; Köhler, C. M.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 378-381

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ISSN: 1600-5759

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/S0108270192005924

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mer-Trichlorotris(2,3-dihydrobenzo[b]thiophene-S)rhodium(III) (1993)

Parvez, M. ; Fait, J. F. ; Clark, P. D. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 383-385

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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/S0108270192009545

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Single-crystal structure of K3Nb8O21 (1993)

Benabbas, A. ; Borel, M. M. ; Grandin, A. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 439-441

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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/S0108270192008916

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Structure of 2-phenyl-2-dehydrosparteine (1993)

Katrusiak, A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 497-500

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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/S0108270192009338

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2-Carboxybenzenediazonium chloride monohydrate (1993)

Horan, C. J. ; Barnes, C. L. ; Glaser, R.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 507-509

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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/S0108270192009673

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Structure of an organic photochromic compound. 6,7,8a,9-Tetrahydro-17,17-dimethylnaphtho[1'',2'':5',6'][1,4]oxazino[3',2':2,3][1,4]oxazino[4,3-a][3H]indole (1993)

Hu, A. T. ; Wang, M. S. ; Wang, S. L.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 509-511

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192008187

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Functionalized hydrocarbons with condensed ring skeletons. XI. Tetramethyl tricyclo[8.4.0.02,7]tetradeca-1,8-diene-5,5,12,12-tetracarboxylate and its corresponding tetradec-8-ene (1993)

Drouin, M. ; Michel-Dewez, N. ; Michel, A. G.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 514-517

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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/S0108270192008151

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Structure of the molecular complex of anthracene with 1,8:4,5-naphthalenetetracarboxylic dianhydride (1993)

Hoier, H. ; Zacharias, D. E. ; Carrell, H. L. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 523-526

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URL: http://dx.doi.org/10.1107/S0108270192007388

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76

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Structure of 4-(5-cyano-2-furyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarbonitrile (1993)

Kozíšek, J. ; Paulus, H. ; Marchalín, Š. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 526-528

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URL: http://dx.doi.org/10.1107/S0108270192010862

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77

Digitale Medien

Dimanganese octacarbonyl complexes with bridging phosphanido ligands (1993)

Flörke, U. ; Haupt, H. J.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 533-535

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URL: http://dx.doi.org/10.1107/S0108270192007443

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78

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Structure of an allotropic form of [bis(trimethylsilyl)amido]dichloro(η5-cyclopentadienyl)titanium (1993)

Laurent, F. ; Legros, J. P.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 540-542

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URL: http://dx.doi.org/10.1107/S0108270192007315

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79

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Structure of bis(benzenesulfonato-O)tetrakis(pyridine-N)copper(II) (1993)

Jedrzejas, M. J. ; Towns, R. L. R. ; Baker, R. J. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 538-540

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Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006280

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80

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Structure of 6-chloro-3,4-dihydro-1H-2,3-benzothiazine 2,2-dioxide (1993)

Rivero, B. E. ; Bianchet, M. A. ; Bravo, R. D.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 546-548

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192007042

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81

Digitale Medien

Structure of two polymorphic acylpyridinium salts (1993)

Bryant, G. L. ; King, J. A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 551-554

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URL: http://dx.doi.org/10.1107/S0108270192007583

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82

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Structure of 1-{4-[2-(diethylamino)ethoxy]phenyl}-2-(4-methoxyphenyl)-1-phenylethan-1-ol, the non-steroidal antiestrogen MER25 (1993)

Hossain, M. B. ; Symersky, J. ; Neely, S. C. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 500-504

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192007893

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83

Digitale Medien

Structure of (±)-egenine (1993)

Dokurno, P. ; Gdaniec, M. ; Kosturkiewicz, Z. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 517-519

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192007509

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84

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Structure of 5,6,11,12-tetrahydro-2,5,8,11-tetramethylphenomazine (1993)

Prasad, S. M. ; Narayan, S. P. ; Mandal, D. K. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 531-533

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192004384

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85

Digitale Medien

Structure of bis(2-aminothiazole)dichlorozinc(II) (1993)

Macícek, J. ; Davarski, K.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 592-593

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192010382

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86

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(+)-2,2'-(1,1'-Binaphthyl)phosphate salt of methyl (11R)-11-{[2-(4-benzylpiperidino)ethyl]thio}-6,11-dihydrodibenz[b,e]oxepin-2-carboxylate (1993)

Hirayama, N. ; Sugaya, T. ; Tomioka, S. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 600-602

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

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URL: http://dx.doi.org/10.1107/S0108270192009090

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87

Digitale Medien

Hexanitrodiphenylmethane (1993)

Cousson, A. ; Lelièvre, J. ; Chatrousse, A. P. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 609-612

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006814

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88

Digitale Medien

Structure of N-(3-phthalimidooxypropyl)trifluoroacetamide (1993)

Van Meervelt, L.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 624-626

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192010473

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Digitale Medien

Structure of 4-(9-phenanthryl)-N,N-dimethylaniline (1993)

Van Meervelt, L.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 593-595

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Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192010059

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90

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Synthesis and structure of (acetato-O,O')(perchlorato-O)(2,2':6'2''-terpyridine-N,N',N'')copper(II) (1993)

Muñoz, M. C. ; Ruiz, R. ; Julve, M. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 674-677

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192004505

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91

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Structure of (S,S)-(E)-3-(2-butenoyl)-2,4-bis(phenylmethyl)oxazolidine (1993)

Hardgrove, G. L. ; Clark, J. S. ; Hanson, R. M. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 336-338

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192004761

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92

Digitale Medien

Structure of 3-benzoylamino-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydrocoumarin (1993)

Leban, I. ; Kocevar, M. ; Vercek, B.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 343-345

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S010827019200444X

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93

Digitale Medien

Structure of tri-p-tolylphosphine oxide hemihydrate, P(p-C6H4CH3)3O.1/2H2O (1993)

Churchill, M. R. ; See, R. F. ; Randall, S. L. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 345-347

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006073

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94

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Low-temperature structures of cis-4-tert-butylcyclohexyl p-nitrobenzoate (1) and trans-4-tert-butylcyclohexyl p-nitrobenzoate (2) (1993)

White, J. M. ; Robertson, G. B.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 347-350

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006024

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95

Digitale Medien

Structure of 17-(3-oxazolin-4-yl)androsta-4,16-dien-3-one (1993)

Meetsma, A. ; van Leusen, D. ; van Leusen, A. M.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 351-354

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006760

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96

Digitale Medien

Structure of orthorhombic triphenylphosphine oxide: a redetermination at room temperature (1993)

Thomas, J. A. ; Hamor, T. A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 355-357

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006176

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97

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Structure of 1,3-di-tert-butyl-2,4-dichloro-2,4-bis[1-(trimethylsilyl)vinyl]-1,3-diaza-2,4-disilacyclobutane (1993)

Auner, N. ; Herdtweck, E. ; Penzenstadler, E.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 359-360

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192006899

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98

Digitale Medien

Ammonium cyclo-octaphosphate–telluric acid dihydrate adduct (1993)

Averbuch-Pouchot, M. T. ; Durif, A.

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 361-363

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192009466

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99

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Tricyclo[9.3.0.03,7]tetradec-3-ene-5,10-dione (I), tetracyclo[9.3.0.01,5.05,9]tetradecane-2,7-dione (II) and cis-cisoid-cis-2,9-epoxy-9-methyltricyclo[9.3.0.04,8]tetradecan-2-ol (III) (1993)

Kawata, T. ; Okuda, M. ; Ohba, S. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 410-413

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192009491

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100

Digitale Medien

Structure of the white-line-inducing principle isolated from Pseudomonas reactans. Erratum. (1993)

Han, F. ; Mortishire-Smith, R. J. ; Rainey, P. B. ; [weitere]

Oxford [u.a.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 417-417

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Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0108270192013106

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