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  • Electronic Resource  (8)
  • 1990-1994  (8)
  • 1993  (8)
Source
Material
  • Electronic Resource  (8)
Years
  • 1990-1994  (8)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Development of a gas chromatograph for trace level measurement of peroxyacetyl nitrate using chemical amplification (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 2472-2477 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00066a012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cryptospirolepine, a Unique Spiro-nonacyclic Alkaloid Isolated from Cryptolepis sanguinolenta (1993)
    s.l. : American Chemical Society
    Journal of natural products 56 (1993), S. 653-670 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50095a001
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    FOSCARNET-INDUCED PENILE ULCERATION (1993)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 32 (1993), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-4362.1993.tb02842.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of CT and MRI in the evaluation of therapeutic response in thoracic Hodgkin disease (1993)
    Springer
    Pediatric radiology 23 (1993), S. 301-304 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Current imaging modalities are accurate in establishing the diagnosis and extent of thoracic Hodgkin disease. After treatment, however, it is extremely difficult to differentiate potential residual active neoplastic disease from scar tissue, or identify early recurrence. We evaluated the contribution of MRI in the assessment of the response to treatment of thoracic Hodgkin disease in the assumption that scar formation would be characterized by low signal intensity in all pulse sequences, whereas active tumor should maintain a degree of high signal intensity on T2-weighted images. In 47 occasions (23 patients) both CT and MRI were able to identify correctly active disease, but had low specificity in confirming remission because of residual tissues masses. High signal intensity on T2-weighted MR images often persisted despite remission, probably because of edema, necrosis, granulation or other factors. MRI was somewhat more specific than CT and may be quite valuable to confirm remission in patients with residual masses that no longer appear hyperintense on T2 after treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010921
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Mitochondrial DNA evidence for the 19th century introduction of African honey bees into the United States (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 530-532 
    Details
    ISSN: 1420-9071
    Keywords: Honey bee ; Apis mellifera ; mitochondrial DNA ; colonization ; subspecies ; population genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Since the introduction of an African subspecies into Brazil in the mid-1950's1, descendent ‘Africanized’ honey bees (Apis mellifera L.) have spread throughout the Neotropics and into temperate North America. Restriction enzyme analysis of 422 feral honey bee colonies collected from non-Africanized areas in the southern United States revealed that over 21% of them had mitochondrial DNA (mtDNA) derived from a European race established in North America by the 17th century, 77% of them had mtDNA common in honey bees maintained by beekeepers and about 1% exhibited African mtDNA. Further analysis revealed that the African mtDNA was derived from a north African subspecies imported to the US in the 19th century.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955156
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Myelin formation by mouse glia in myelin-deficient rats treated with cyclosporines (1993)
    Springer
    Journal of neurocytology 22 (1993), S. 967-977 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Previous attempts to generate myelin in the myelin-deficient rat spinal cord by transplanting mouse glia were not successful. In order to determine whether this result was due to graft rejection or to interspecies mismatch of cellular or molecular components at the axoglial junction, we have repeated the experiment in cyclosporine-treated rats. Our results show that in the immunosuppressed hosts, foetal glial xenografts form an abundance of myelin within the dorsal columns at or near the injection site about two weeks after the operation. In some cases, myelination extends virtually across the entire width of the dorsal columns. Ultrastructurally, the myelin sheaths are normal in all respects, including the presence of the ‘radial component’. The lateral edges of the myelin lamellae form typical paranodal axoglial junctions, some displaying periodic ‘transverse bands’. We infer that previous mouse to rat xenograft failures reflect host immune response rather than mismatch of heterologous junctional components. We also compared foetal, early post-natal and adult xenografts. Foetal donor cells, containing an abundance of precursors but virtually no mature oligodendrocytes, are more effective than neonatal donor cells in forming myelin, and after adult grafts, we found no myelin formation. Thus, in xenografts, as in allografts, foetal precursor cells are far more suitable than glia from mature donors in generating significant amounts of myelin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218354
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The heavy fermion damping rate puzzle (1993)
    Springer
    The European physical journal 60 (1993), S. 455-460 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine again the problem of the damping rate of a moving heavy fermion in a hot plasma within the resummed perturbative theory of Pisarski and Braaten. The ansatz for its evaluation which relates it to the imaginary part of the fermion propagator pole in the framework of a self-consistent approach is critically analyzed. As already pointed out by various authors, the only way to define the rate is through additional implementation of magnetic screening. We show in detail how the ansatz works in this case and where we disagree with other authors. We conclude that the self-consistent approach is not satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560043
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A superelement for two-dimensional singular boundary value problems in linear elasticity (1993)
    Springer
    International journal of fracture 62 (1993), S. 325-340 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The finite element method for elliptic boundary value problems has been modified to deal with boundary singularities. We introduce a singular-super-element (SSE) which incorporates the known expansion for the singular solution explicitly over the internal region surrounding the singular point, whilst using blended trial functions over the intermediate region, which joins the internal and external regions smoothly. The SSE conforms with the mesh used in the external region, and may be easily incorporated into standard finite element programs. The calculations yield the expansion coefficients directly, as well as an accurate representation of the displacements in the vicinity of the singular point, for a crack or V-notch of any angle subject to any mode of loading. The SSE has been applied to determine stress intensity factors for two-dimensional crack and V-notch problems, including mixed mode. The computations converge rapidly, yielding results of high accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017239
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    Paper (German National Licenses)
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