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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 7 (1992), S. 192-194 
    ISSN: 1437-9813
    Keywords: Ureterocele ; Vesicoureteric reflux ; Renal function ; Duplex kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A total of 215 ureteroceles were present in 41 children with single-system and 154 children with double-system ureteroceles. Males were predominant in the single-system group while the reverse was true in patients with double-system ureteroceles. Single-system ureteroceles occurred more commonly on the left side. In double-system ureteroceles there was minimal renal function in 74% of the ureterocele-bearing moieties, 26% of the ipsilateral lower moieties, and 3% of the contralateral kidneys. Vesicoureteric reflux (VUR) was present in 17% of the ureterocele-bearing ureters, 54% of the ipsilateral second ureters, and 28% of the contralateral ureters. In the single-system ureteroceles, 20% of the ipsilateral kidneys had minimal renal function and 9% of both the ipsilateral and contralateral ureters had VUR. Differences in laterality, VUR, and function of the subservient renal tissue suggest that single-system ureteroceles are a different disease entity from the double-system type and should be considered separately in any discussion of the management of ureteroceles.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta applicandae mathematicae 21 (1990), S. 291-313 
    ISSN: 1572-9036
    Keywords: 65F ; 65G ; Complex symmetric matrix ; equivalent symmetric matrices ; error-free matrix symmetrizers ; floating-point modular arithmetic ; Hessenberg matrices ; nonsymmetric eigenvalue problem ; parallel implementation ; QR transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A symmetrizer of the matrix A is a symmetric solution X that satisfies the matrix equation XA=A′X. An exact matrix symmetrizer is computed by obtaining a general algorithm and superimposing a modified multiple modulus residue arithmetic on this algorithm. A procedure based on computing a symmetrizer to obtain a symmetric matrix, called here an equivalent symmetric matrix, whose eigenvalues are the same as those of a given real nonsymmetric matrix is presented.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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