Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Structural systematics for 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane-type compounds: crystal structures of five analogs and comments on mode of action (1984)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 32 (1984), S. 886-895 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00124a048
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Structural Characterization of Aluminum Phosphate Binder (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The chemical structure of aluminum phosphate binder, which is used as a sealant for thermally sprayed coatings, was studied. Powder X-ray diffraction (XRD) analysis showed that the binder was a mixture of several phases. None of these phases could be identified from the powder XRD data only. Electron diffraction revealed several distinct microcrystalline phases. The predominated phase was analyzed in more detail. The three-dimensional reciprocal lattice was reconstructed from a tilt series of electron-diffraction patterns that indicated that the main phase was the cyclohexaphosphate Al2P6O18. The similarity of the intensity distribution in the observed and simulated electron-diffraction patterns of Al2P6O18 confirmed this observation. The following unit-cell parameters were determined from the reconstructed reciprocal lattice: a= 8.8(7) Å, b= 15.5(6) Å, and c= 6.3(9) Å, β= 108°, and Z= 2. The reflection conditions indicated that the space group was P21/a.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01477.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A crystal structure determined with 0.02 Å accuracy by electron microscopy (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 144-146 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Metal-rich compounds frequently contain clusters with metal-metal (M-M) bonded octahedral M6 cores. Depending on the relative metal content, these octahedral units may condense, that is, share corners, edges or faces. The condensed M6 clusters can be regarded as slightly distorted fragments of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/382144a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The protein content in crystals and packing coefficients in different space groups (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 789-790 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A precise way of estimating the packing coefficient, i.e. the ratio between the protein and unit-cell volume, or solvent content in protein crystals is given. At present, the solvent content is not given for most proteins in the Protein Data Bank and in many cases where it is given the values are dubious. The mean density of proteins in the crystalline form is around 1.22 g cm−3, not 1.35 g cm−3 as usually stated. This is equivalent to 19.5 Å3 per non-H atom. A statistical investigation of the average protein content and packing coefficient in different space groups is presented. The packing coefficients are generally higher in the most frequently occurring space groups than in the uncommon space groups. There is also a remarkable difference in frequency distribution for enantiomorphous pairs of space groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900005163
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Structures of nanometre-size crystals determined from selected-area electron diffraction data (2000)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 29-35 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of a new modification of Ti2Se, the β-phase, and several related inorganic crystal structures containing elements with atomic numbers between 16 and 40 have been solved by quasi-automatic direct methods from single-crystal electron diffraction patterns of nanometre-size crystals, using the kinematical aproximation. The crystals were several thousand times smaller than the minimum size required for single-crystal X-ray diffraction. Atomic coordinates were found with an average accuracy of 0.2 Å or better. Experimental data were obtained by standardized techniques for recording and quantifying electron diffraction patterns. The SIR97 program for solving crystal structures from three-dimensional X-ray diffraction data by direct methods was modified to work also with two-dimensional electron diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767399009605
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A pentagonal cluster in certain approximants to decagonal quasicrystals (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 646-651 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A certain pentagonal cluster occurring in several approximants to the decagonal quasicrystal is discussed. The term `cluster' is used here to denote a structure motif which is a certain assemblage of coordination polyhedra. The cluster resembles a wheel with an `axis' and a `tyre'. It is built up of seven intergrown icosahedra. The `wheel cluster' builds up structures of infinite strands or nets perpendicular to the pentagonal wheel cluster axis. The wheel cluster is the main constituent of the decagonal approximant structure types Al3Mn, Al60Mn11Ni4 and Ga137Mn123.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768101010539
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Accurate atomic positions from electron microscopy (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 238-241 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A sample with composition K8_xNb16_xW12-f.xO80 (where x 1) was ground to a fine powder and dispersed in n-butanol. A drop of this suspension was collected on a holey carbon film supported by a copper grid and examined in a JEOL JEM 200CX/THG 2 electron microscope equipped with a top entry ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311238a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Correcting for crystal tilt in HRTEM images of minerals: the case of orthopyroxene (1995)
    Springer
    Physics and chemistry of minerals 22 (1995), S. 517-523 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract High-resolution transmission electron microscopy (HRTEM) is a powerful technique for crystal structure imaging and real structure analysis. It is theoretically possible to resolve inter-atomic distances with modern high resolution microscopes. In practice, however, the effects of sample and lens parameters such as crystal tilt and phase contrast transfer function (CTF) distort the images, reduce the resolution offered, and make image interpretation difficult. We have analyzed to what extent it is possible to reconstruct interpretable images of a tilted mineral by image processing. HRTEM images of orthopyroxene were simulated for a series of crystal tilts and thicknesses under Scherzer defocus condition using the parameters of a 400 kV microscope. The tilted images were reconstructed by crystallographic image processing. After correcting for crystal tilt, the images were as good as electron density maps calculated from X-ray diffraction structure factors. The effects of crystal tilt could easily be removed by image processing, if specimen thickness and the tilt angle are less than 10 nm and 2.5°, respectively. For larger crystal thicknesses (〉20 nm) the effect of tilting could be removed only for small tilt angles (〈1°). For a given crystal thickness, a slight tilt often resulted in an improved reconstructed image.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209378
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...