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  • 1
    Electronic Resource
    Electronic Resource
    Book review (1982)
    Springer
    Journal of chemical crystallography 12 (1982), S. 519-522 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160905
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  • 2
    Electronic Resource
    Electronic Resource
    An SCF partitioning scheme for the hydrogen bond (1970)
    Springer
    Theoretical chemistry accounts 18 (1970), S. 399-403 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The total energy of hydrogen bonding is divided into electrostatic and delocalization contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526460
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  • 3
    Electronic Resource
    Electronic Resource
    Dampfkesselbetrieb (1942)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 123 (1942), S. 231-232 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01578935
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  • 4
    Electronic Resource
    Electronic Resource
    Thalamic projecting neurons in the feline nucleus cuneatus. A combined horseradish peroxidase and high voltage electron microscopic study (1982)
    Springer
    Journal of neurocytology 11 (1982), S. 3-17 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The retrograde transport of horseradish peroxidase (HRP) has been employed to identify thalamic projection neurons (TPN) in the feline nucleus cuneatus by means of light microscopy and high voltage electron microscopy. Forty-eight hours after injection of HRP in the contralateral ventrobasal complex of the thalamus, labelled neurons at levels caudal to the obex are concentrated in the cell clusters of the dorsal two-thirds of the nucleus. In plastic sections, labelled TPN are identified by the presence of HRP-positive granules in the perinuclear cytoplasm. TPN are typically about 25 μm in diameter, have a round nucleus with a smooth contour and abundant cytoplasm. In contrast, neurons unlabelled after thalamic injection are located at the periphery of clusters of TPN. Unlabelled neurons are characterized by their fusiform shape (hence, round when encountered in cross-section), small diameter (10–15 μm), a nucleus with an irregular or highly indented contour, and sparse cytoplasm. At the ultrastructural level, TPN are identified by the presence of HRP-positive, membrane-bound, dense bodies in the perinuclear cytoplasm. Furthermore, the presence of such dense bodies in cross-sections of dendrites allows their identification as processes of TPN. The perikarya of adjacent neurons in a cluster are often closely apposed and separated by an extracellular space of 20 to 25 nm. Adjacent to such sites of apposition, small boutons are often presynaptic to one or both of the neurons. The possible functional implications of such an arrangement are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01258001
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  • 5
    Electronic Resource
    Electronic Resource
    Perfluorooctylbromide (PFOB) as a vitreous substitute in non-human primates (1993)
    Springer
    International ophthalmology 17 (1993), S. 259-264 
    Details
    ISSN: 1573-2630
    Keywords: perfluorocarbon liquids ; retinal toxicity ; vitreous substitutes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We evaluated the toxicity of perfluorooctylbromide in the primate eye as a short-term postoperative vitreous substitute. Four eyes of 4 African green monkeys underwent complete vitrectomy and vitreous replacement with 1.5–2.0 ml of PFOB. One additional animal received BSS as a control vitreous substitute in one eye. Animals were examined twice weekly for clarity and consistency of the vitreous replacement substance. Anterior segment and lenses remained clear in all eyes, although in the immediate postoperative period one eye became inflamed and had a culture-negative vitritis. The other eyes showed a minimal anticipated postoperative vitreous inflammation. Emulsification of the PFOB began within 3 days of injection and progressed up to 3 weeks, precluding fundus examination and fluorescein angiography after 2 weeks. Eyes were enucleated and light microscopy performed at 2 days, 10 days, 33 days, and 45 days. No toxic effects to the retinal cells were detectable by histological examination, but perivasculitis of retinal vessels was noted at 45 days. Indirect examination was normal up to 10 days; thereafter, the fundus view was obscured by the emulsified PFOB. Because of cellular migration into the vitreous cavity and retinal perivasculitis, observed histologically, PFOB seems most suitable for intraoperative rather than postoperative use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01007793
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  • 6
    Electronic Resource
    Electronic Resource
    The electronic structure of 4H-pyran-4-one and its sulfur analogues (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 29 (1986), S. 1503-1512 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electronic structure of 4-H-pyran-4-one and its sulfur analogues were studied using ab initio wave-functions. Bond lengths and overlap populations suggest low aromaticity for this group of compounds. Examination of Jorgensen plots of the lowest π orbitals of I--IV leads to the aromaticity order 4H-thiopyran-4-thione (IV) 〉 4H-thiopyran-4-one (II) 〉 4H-pyran-4-thione (III) 〉 4H-pyran-4-one (I). The effects of including d orbitals were studied using the 3-21G, 3-21G* (6d), and 3-21G* (5d) basis sets. Optimized bond lengths, vibrational frequencies, ionization energies, and dipole moments were also obtained, and results for different basis sets were compared.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560290541
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  • 7
    Electronic Resource
    Electronic Resource
    1,5-C2B3H5 and C5H8, 1,5-C2B3H3 and C5H6: Carborane-hydrocarbon structural analogs with unusual three-center bondsDedicated to William Nunn Lipscomb in honor of his many important contributions to structural and theoretical chemistry. (1991)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 40 (1991), S. 489-505 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electronic structure of the polyhedral carboranes 1,5-dicarba-closo-pentaborane(5) and 1,5-dicarba-closo-pentaborane(3) is studied using ab initio calculations, and compared to that of their hydrocarbon analogs bicyclo[1.1.1]pentane and [1.1.1]propellane, respectively. The high symmetry and common topology of the carborane-hydrocarbon structural analogs force similar bonding patterns, and the carboranes show a unique three-center, two-electron CBC bond not previously observed in these species. This three-center bond is formally analogous to the σ-bridged-π bond in the hydrocarbons, but its strength is low and its C—C bond long. Analysis of the bonding in these carboranes along with that in 1,3-diborabicyclo[1.1.1]pentane, another[1.1.1]propellane analog, shows that the strength of their three-center bonds is directly related to the nature of the bridging group, but is independent of the type of bridgehead atom. 1,3-Diboretene, the carborane analog of bicyclo[1.1.0]butane, is also found to exhibit a similar bonding pattern to its hydrocarbon analog and to possess a CBC bond.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560400845
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  • 8
    Electronic Resource
    Electronic Resource
    Pyramidale Inversion (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 82 (1970), S. 453-468 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neuere theoretische und experimentelle Untersuchungen über die pyramidale Inversion werden dargelegt in dem Versuch, ein zusammenhängendes Bild dieser Umwandlung zu zeichnen. Quantenmechanische Studien an pyramidalen Molekülen zeigen, daß das Auftreten einer Inversionsbarriere möglicherweise davon abhängt, wie weit die Bindungswinkel während der Inversion unverändert bleiben. Die Einflüsse der Elektronegativität der Substituenten am Inversionszentrum, einsamer Elektronenpaare und der Einbeziehung von d-Orbitalfunktionen in den Basissatz werden beschrieben. Brauchbarkeit und Grenzen von Molekülorbital-Berechnungen, der Schwingungs- und Mikrowellen-Spektroskopie, direkter kinetischer Messungen und der dynamischen NMR-Spektroskopie (dNMR) zur Ermittlung der einer pyramidalen Inversion entgegenstehenden Energiebarriere werden diskutiert im Zusammenhang mit einem Überblick über die wichtigsten experimentellen Ergebnisse solcher Arbeiten. Besondere Aufmerksamkeit gilt den Zweideutigkeiten, die bei der Interpretation der durch dNMR-Spektroskopie ermittelten Energiebarrieren auftreten. Die Faktoren, von denen die Größe einer Inversionsbarriere abhängt, werden in vier großen Kategorien besprochen: sterische Effekte, Konjugation [einschließlich der (p-d)π-Konjugation] und Hyperkonjugation, Winkelspannungen und Substitution durch Heteroatome. In der letzten Kategorie findet sich eine kritische Diskussion der Einflüsse von Elektronegativität und der Abstoßung zwischen einsamen Elektronenpaaren, der Beziehung zwischen Rotation und Inversion sowie der Rolle der d-Orbitale.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19700821202
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of deuterium substitution on hydrogen bonds in redox proteins (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 195-200 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230203
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrogen-bond cooperativity in protein secondary structure (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 2451-2458 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen bonding in the α-helix and β-sheet has been studied by ab initio molecular orbital calculations carried out on complexes of formamide. Hydrogen-bond geometries were taken from x-ray crystallography of polypeptides. Positive cooperativity is found in all cases. The limiting value for infinite chains is obtained by use of a double-reciprocal plot and indicates an increase in the effective bond strength of 25% over that of a single isolated bond. Parallel calculations based on a classical electrostatic model yield qualitatively similar trends but underestimate the cooperativity by half. Charge redistribution accompanying cooperativity is characterized by a new type of charge-density difference plot, the cooperativity map. The magnitude and distance over which cooperativity acts suggest several significant biological consequences. Thus the average of α-helices and the number of β-sheet strands found in protein may be influenced by cooperativity. Cooperativity in the interpeptide hydrogen bond may also be partly responsible for the rapid formation of secondary structure in renaturing proteins and help stabilize secondary structure relative to the random-coil conformation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360181006
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