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  • 1995-1999  (2)
  • 1998  (2)
  • Gaussian curvature  (1)
  • Computational Chemistry and Molecular Modeling
  • United States
Material
Years
  • 1995-1999  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of global analysis and geometry 16 (1998), S. 89-100 
    ISSN: 1572-9060
    Keywords: Gaussian curvature ; helicoid ; minimal surface ; Stolz angle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider simply connected minimal surfaces in Euclidean space and we give a characterisation of the helicoid.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7225
    Keywords: Acetaminophen ; kidney neoplasms ; renal cell carcinoma ; United States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Experimental and epidemiologic evidence have suggested that phenacetin use increases the risk of transitional cell cancers of the urinary tract. The drug is no longer marketed but a commonly used metabolite, acetaminophen, has been linked recently to an increased risk of renal cancer. We assessed the relation of acetaminophen use to the risk of transitional cell cancer of the urinary tract and of renal cell cancer with data from a hospital-based study of cancers and medication use conducted from 1976-96 in the eastern United States. We compared 498 cases of transitional cell cancer and 383 cases of renal cell cancer with 8,149 noncancer controls and 6,499 cancer controls and controlled confounding factors with logistic regression. For transitional cell cancer, the relative risk (RR) estimate for regular acetaminophen use that had begun at least a year before admission was 1.1 (95 percent confidence interval [CI] = 0.6-1.9) based on noncancer controls, and 0.9 (CI = 0.5-1.6) based on cancer controls. RR estimates for use that lasted at least five years, and for nonregular use, were also close to 1.0. For renal cell cancer, the corresponding estimates were again close to 1.0. Our results suggest that acetaminophen, as used in present study population, does not influence the risk of transitional cell cancer of the urinary tract or of renal cell cancer.
    Type of Medium: Electronic Resource
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