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  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 738-742 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: New crystals of the signal-transducing protein PII have been obtained in the presence of a number of different effector ligands. Various crystal forms are observed depending on the nature of the ligand(s). Co-crystallization with 2-ketoglutarate, glutamate and pyrophosphate produces hexagonal crystals similar to the wild type, ATP yields cubic crystals and ATP in conjunction with 2-ketoglutarate or glutamate yields orthorhombic crystal forms. All of the above crystals have been characterized by X-ray diffraction analysis. The hexagonal crystals belong to space group P63, cubic crystals to either I23 or I213 and orthorhombic crystals to I222. A molecular-replacement solution for the PII/ATP/2-ketoglutarate crystals has been obtained giving us an initial model for a trimer in the orthorhombic crystal form.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 92 (1987), S. 224-228 
    ISSN: 1432-2072
    Keywords: DGAVP ; Memory ; Alertness ; Concentration ; Mood ; Humans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The influence of an increasing dose of the vasopressin-like peptide DGAVP (desglycinamide-arginine-vasopressin) on memory was investigated in two groups of ten healthy male volunteers to provide information about the hypothesis of improvement of memory by vasopressin. At the same time we evaluated the effect of DGAVP on mood, alertness or sleepiness in a double-blind placebo-control design. The treatment group received at 9.15 a.m. intranasally a daily increasing dose from 0.1 mg at day 1 to 10.0 mg at day 5. DGAVP did not significantly affect any measure of memory or alertness. DGAVP did, however, produce a significant increase in concentration level and mood. The results of the present study provide no support for the vasopressin theory of memory improvement; rather, the results direct the attention to attention modulating effects.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 817-823 
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In order to study the aromatic ring currents in triptycene and tribenzotriptycene, the magnetic susceptibility anisotropies of these molecules have been determined by the NMR analogue of the Cotton-Mouton effect: Δ χ(triptycene) = 24.0 x 10-34 m3 (1.91 x 10-28 emu), Δ χ(tribenzotriptycene) = 44.5 x 10-34 m3 (3.54 x 10-28 emu). These values are well predicted from a model of independent fragment molecules, showing that the ring currents in the rings of triptycene and tribenzotriptycene are essentially the same as in planar aromatic molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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