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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative study of lateral horn cells in 15 cases of multiple system atrophy (1988)
    Springer
    Acta neuropathologica 75 (1988), S. 513-518 
    Details
    ISSN: 1432-0533
    Keywords: Cell counts ; Dysautonomia ; Lateral horn of the spinal cord ; Multiple system atrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nerve cell counts of the lateral horns of the spinal cord were performed in 15 cases of multiple system atrophy (MSA) and three age-and sexmatched controls. The patients with MSA were comprised of eight with severe postural hypotension, three with orthostatic hypotension and little or no disability and four without any signs of autonomic failure. All cases of MSA had lost more than half their lateral horn cells but nerve cell loss could not be correlated with the degree of dysautonomia. These results confirm the involvement of the intermediolateral columns of the spinal cord in MSA. However, the lack of correlation between cell loss and severity of autonomic failure in our cases, suggests that lesions of other sites, such as sympathetic ganglia or the dorsal vagal nuclei, are also implicated in dysautonomia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687140
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bone formation following carpal interposition arthroplasty (1990)
    Springer
    Skeletal radiology 19 (1990), S. 31-32 
    Details
    ISSN: 1432-2161
    Keywords: Arthroplasty ; Carpal ; Heterotopic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two cases of bone formation occuring at the site of carpal excision and soft tissue interposition are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197925
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The Lyapunov exponent and joint spectral radius of pairs of matrices are hard—when not impossible—to compute and to approximate (1997)
    Springer
    Mathematics of control, signals, and systems 10 (1997), S. 31-40 
    Details
    ISSN: 1435-568X
    Keywords: Lyapunov exponent ; Lyapunov indicator ; Joint spectral radius ; Generalized spectral radius ; Discrete differential inclusion ; Computational complexity ; NP-hard ; Algorithmic solvability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics , Technology
    Notes: Abstract We analyze the computability and the complexity of various definitions of spectral radii for sets of matrices. We show that the joint and generalized spectral radii of two integer matrices are not approximable in polynomial time, and that two related quantities—the lower spectral radius and the largest Lyapunov exponent—are not algorithmically approximable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01219774
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    Paper (German National Licenses)
    Fulltext
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