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  • 1
    Electronic Resource
    Electronic Resource
    The number of Kα photons produced on a set of thin targets as a functional description of the fluorescence exciting x-ray beamPresented at the European Conference on EDXRS, Myconos, Greece, 30 May-6 June 1992. (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 312-316 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This work suggests a theoretical approach for the description of a primary x-ray beam by means of the K fluorescence which it excites on a set of thin targets made of pure elements. Physical quantities, defined as weighted integrals over hv of the photon spectral distribution, are obtained directly as weighted integrals of the Kα yields over the variable Ez (the ionization energy of the K shell of the element with atomic number Z), without needing any explicit reconstruction of the spectral distribution. The set of Kα yields produced by an x-ray beam as a function of Ez is a functional description of the exciting beam. Theoretically, such a description is suited to x-ray fluorescence analysis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220425
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  • 2
    Electronic Resource
    Electronic Resource
    1H, 13C, 15N, 113Cd, 2D 15N—1H and solid-state 13C CP/MAS NMR of Hg and Cd complexes of 4(1H)-quinazolinone-2,3-dihydro-2-thioxo (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 832-835 
    Details
    ISSN: 0749-1581
    Keywords: 1H, 13C, 15N and 113Cd NMR ; Two-dimensional NMR ; CP/MAS NMR ; Hg and Cd complexes 4(1H) -Quinazolinone-2,3-dihydro-2-thioxo ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Cd(II) and Hg(II) complexes of 4(1H)-quinazolinone-2,3-dihydro-2-thioxo (1) and the free ligand were studied by 1D and 2D multinuclear magnetic resonance in solution and 13C cross polarization magic angle spinning NMR in the solid state. Compound 1 adopts only one of five possible tautomeric structures in solution, namely the thiouracyl-like structure. It was found that the metal atom is linked to two molecules of deprotonated 1 by N-1 and coordinated by the sulphur atom. The compounds retain the same structure in the solid state and in dimethyl sulphoxide solution.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310908
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  • 3
    Electronic Resource
    Electronic Resource
    HRGC and GC-MS analysis of essential oil from colombian ylang-ylang (Cananga odorata Hook fil. et Thomson, forma genuina) (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 441-444 
    Details
    ISSN: 0935-6304
    Keywords: High resolution capillary gas chromatography ; High resolution gas chromatography-mass spectrometry ; Essential oil analysis ; Ylang-ylang oil composition ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Samples of essential oil from Colombian ylang-ylang trees were analyzed by means of HRGC, HRGC-MS, IR and 1H- and 13C-NMR. 57 components were detected, 51 of which were positively identified. Camphene and anethol were identified in ylang-ylang essential oil for the first time. Among the composition-determining variables studied (extraction time, part of the flower, and flower freshness), the extraction time and the flower condition (fresh versus dry) were found to have the largest incidence in the quality of the essential oil.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240160713
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  • 4
    Electronic Resource
    Electronic Resource
    NMR Study of isolobal N-CH3+, N-BH3 and N-BF3 imidazole derivatives (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 189-193 
    Details
    ISSN: 0749-1581
    Keywords: Imidazole-BH3 ; Imidazole-BF3 ; 1H, 11B and 13C NMR ; Long-range J(C,H) values ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some N-BH3, N-BF3, N+-CH3 and N+-H imidazole derivatives have been prepared and their 13C, 11B and 1H NMR spectra studied. The effect of the different substituents was analysed. The isolobal character of the N-BH3 and N-CH3 derivatives is reflected in their spectra. In the 13C—H coupled spectra of N-borane adducts, the hydrides appear to be coupled with the heterocyclic carbon atoms. The C-4 chemical shift value is indicative of the nature of the N-substitution: lone pair (128-130 ppm), BH3 (126-128 ppm), BF3 and [CH3]+ (122-124 ppm) or [H]+ (117-119 ppm). The latter values allowed the chemical shifts of frozen imidazole to be estimated: 128 ppm for C-4 and 117 for C-5.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310207
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  • 5
    Electronic Resource
    Electronic Resource
    1H 2D-NMR characterization of Ni(II)-substituted azurin from Pseudomonas aeruginosa (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. S41 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; Two-dimensional NMR ; Azurin ; Nickel(II)-azurin ; Paramagnetic metalloproteins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H two-dimensional NMR experiments on nickel(II)-substituted azurin have been successfully applied. Despite the short relaxation times of the hyperfine-shifted resonances, the combined use of NOESY and COSY spectra allowed the assignment of 15 resonances belonging to the metal-coordinated residues Gly-45, His-46, His-117 and Met-121. Even in the case of the two broad and furthest downfield resonances, the NOESY spectra were successful in assigning these signals to the β-CH2 protons of Cys-112. The protons of the non-coordinated residues Met-13, Phe-15 and Trp-48 were also assigned via NOESY, COSY and TOCSY experiments.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260311310
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  • 6
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    A wingless-dependent polar coordinate system in Drosophila imaginal discs (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-01-22
    Description: The patterning of the imaginal discs in Drosophila melanogaster is a progressive process that, like the patterning of the larval epidermis during embryogenesis, requires the activity of segment polarity genes. One segment polarity gene, wingless, encodes a homolog of the mouse proto-oncogene Wnt-1 and plays a prominent role in the patterning of the larval epidermis and the imaginal discs. However, whereas the function of wingless in the embryo is initially associated with a pattern of stripes along the anteroposterior axis that are part of a Cartesian coordinate system, it is shown here that during imaginal development wingless is associated with a pattern of sectors that provide references for a polar coordinate system homologous to that postulated in a well-known model for the regeneration of insect and vertebrate limbs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Couso, J P -- Bate, M -- Martinez-Arias, A -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1993 Jan 22;259(5094):484-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Cambridge, United Kingdom.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8424170" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila melanogaster/embryology/*genetics/growth & development ; Embryo, Nonmammalian/cytology/physiology ; Gene Expression ; Larva ; Mice ; Phenotype ; Protein-Tyrosine Kinases/genetics ; Proto-Oncogene Proteins/genetics ; Proto-Oncogenes ; Sequence Homology, Nucleic Acid ; Wings, Animal ; Wnt Proteins ; Wnt1 Protein ; *Zebrafish Proteins ; beta-Galactosidase/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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