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  • Ab-initio SCF calculations  (4)
  • Chemistry  (3)
  • Magnetic resonance imaging  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Serial changes on MRI in lumbar disc herniations treated conservatively (1995)
    Springer
    Neuroradiology 37 (1995), S. 378-383 
    Details
    ISSN: 1432-1920
    Keywords: Lumbar disc herniation ; Conservative treatment ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using serial MRI, we studied 32 patients with herniated lumbar discs, treated conservatively, to clarify the natural history of this condition. MRI was performed in the acute stage, then 6 months and 1 year later. On axial images, the proportion of the cross-sectional area of the spinal canal occupied by the herniated disc was 31.9% on the average on the initial scan, 28.7% 6 months and 25.3% 1 year later. The size of the herniation decreased by more than 20% in 11 patients (34%), by 10–20 % in 8 (28%) and was unchaged in 12 (38%). The height of the disc slightly decreased with time, but there was no significant change in the angle of lordosis in the affected segment. The initial MRI revealed degeneration of all affected discs, and progressive degeneration was observed in 9 patients. The more degenerate the disc and the larger the initial herniation the more the size of the herniated fragment decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588017
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spinocerebellar ataxia type 6: MRI of three Japanese patients (1998)
    Springer
    Neuroradiology 40 (1998), S. 222-227 
    Details
    ISSN: 1432-1920
    Keywords: Key words Spinocerebellar ataxia type 6 ; Cerebellar cortical atrophy ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe the MRI findings in three Japanese patients with spinocerebellar ataxia type 6 (SCA6) in which a polymorphic CAG repeat was identified in the gene encoding the α1A voltage-dependent P/Q-type Ca2+ channel subunit (CACNL1A4). All showed slowly progressive cerebellar ataxia and mild pyramidal signs. Neuroradiologically, they had moderate cerebellar atrophy, most prominently in the superior vermis, whereas the brain stem appeared to be spared. No abnormal signal intensity was identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050571
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Apparent diffusion coefficient measurements in progressive supranuclear palsy (2000)
    Springer
    Neuroradiology 42 (2000), S. 643-647 
    Details
    ISSN: 1432-1920
    Keywords: Key words Progressive supranuclear palsy ; Magnetic resonance imaging ; Diffusion-weighted imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We measured the apparent diffusion coefficient (ADC), using diffusion-weighted imaging (DWI) and signal intensity on T2-weighted MRI in the cerebral white matter of patients with progressive supranuclear palsy (PSP) and age-matched normal subjects. In PSP, ADC in the prefrontal and precentral white matter was significantly higher than in controls. There was no significant difference in signal intensity on T2-weighted images. The ADC did correlate with signal intensity. The distribution of the elevation of ADC may be the consequence of underlying pathological changes, such as neurofibrillary tangles or glial fibrillary tangles in the cortex. Our findings suggest that ADC measurement might be useful for demonstrating subtle neuropathological changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340000372
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ab-initio SCF potential energy surfaces for the nucleophilic attack of hydride on coordinated carbon monoxide (1982)
    Springer
    Theoretical chemistry accounts 61 (1982), S. 587-595 
    Details
    ISSN: 1432-2234
    Keywords: Nucleophilic addition ; CO activation ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ab-initio SCF calculations are reported for the nucleophilic addition of the hydride ion H− on the iron pentacarbonyl Fe(CO)5 complex. The stereochemistry of the attack has been established from the determination of two potential energy surfaces. The reaction is shown to be highly exothermic and with no activation barrier. This activation of CO towards the nucleophilic addition is rationalized in terms of molecular orbital interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552671
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  • 5
    Electronic Resource
    Electronic Resource
    Ab-initio SCF potential energy surfaces for the nucleophilic attack of hydride on coordinated carbon monoxide (1982)
    Springer
    Theoretical chemistry accounts 61 (1982), S. 587-595 
    Details
    ISSN: 1432-2234
    Keywords: Nucleophilic addition ; CO activation ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ab-initio SCF calculations are reported for the nucleophilic addition of the hydride ion H− on the iron pentacarbonyl Fe(CO)5 complex. The stereochemistry of the attack has been established from the determination of two potential energy surfaces. The reaction is shown to be highly exothermic and with no activation barrier. This activation of CO towards the nucleophilic addition is rationalized in terms of molecular orbital interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394735
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Rotational isomerism inbis carbene MOL4 complexes: A theoretical study (1984)
    Springer
    Theoretical chemistry accounts 64 (1984), S. 461-467 
    Details
    ISSN: 1432-2234
    Keywords: Carbene rotational barriers ; Isolobal analogy ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract LCAO-MO-SCF calculations are reported for the different stereoisomers of the Mo(CO)4(CH2)2 and Mo(CO)4[C(NH2)2]2 systems. The substitution of the hydrogen atoms by the amino groups in the carbene ligands leads to an almost zero rotational barrier. Steric interactions are therefore expected to govern the barrier for diaminocarbene ligands which are more bulky than C(NH2)2. The rotational isomerism in thesebis carbene MoL4 systems is also discussed in connection with the isolobal analogy between CH2 and C2H4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399238
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational isomerism inbis carbene MOL4 complexes: A theoretical study (1984)
    Springer
    Theoretical chemistry accounts 64 (1984), S. 461-467 
    Details
    ISSN: 1432-2234
    Keywords: Carbene rotational barriers ; Isolobal analogy ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract LCAO-MO-SCF calculations are reported for the different stereoisomers of the Mo(CO)4(CH2)2 and Mo(CO)4[C(NH2)2]2 systems. The substitution of the hydrogen atoms by the amino groups in the carbene ligands leads to an almost zero rotational barrier. Steric interactions are therefore expected to govern the barrier for diaminocarbene ligands which are more bulky than C(NH2)2. The rotational isomerism in thesebis carbene MoL4 systems is also discussed in connection with the isolobal analogy between CH2 and C2H4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554231
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Chemoselective polycondensation of isophthaloyl chloride with multifunctional monomers containing hydroxyl groups and sulfamino acid or amino acid moiety (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 493-495 
    Details
    ISSN: 0887-624X
    Keywords: chemoselective polycondensation ; functional polymer ; aromatic polyester ; hydroxyl group ; sulfamino acid moiety ; amino acid moiety ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of copolyester having quaternary ammonium groups in the main chain (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2517-2519 
    Details
    ISSN: 0887-624X
    Keywords: functional polyester ; liquid/solid biphase polycondensation ; tertiary amine group ; heterogeneous polymer reaction ; quaternary ammonium group ; 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
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    Paper (German National Licenses)
  • 10
    Electronic Resource
    Electronic Resource
    Factors affecting dynamic durability of polycarbonate under bending, torsional, and impacting fatigue and in cavitation erosion and dynamic solvent cracking conditions (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 79-92 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: To understand influences of various factors on dynamic durability of engineering plastics, effects of average molecular weights of samples, molding variables, preparing methods of specimens, and fillers on plane and rotational bending, torsional, and impacting fatigue and cavitation erosion and solvent cracking of polycarbonate were studied. From the experimental results, the following tendencies are observed as a whole in case of polycarbonate: The extent of influence of the factors on dynamic durability varies depending on the type of testing. Increase in molecular weight has a favorable effect on dynamic durabilities. Influence of molding conditions is remarkable: especially, deficient drying of resin pellets before molding decreases dynamic durability noticeably, and specimens prepared by injection molding have much better durabilities than those by machaning from extruded sheet. Polyethylene blending has an unfavorable effect on durability, except for Izod-type impact strength and solvent cracking. Reinforcement by glass fiber has a favorable effect on fatigue under constant deformation and cavitation erosion.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200108
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