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  • 1
    Electronic Resource
    Electronic Resource
    A contribution to the formation mechanism of calcium oxalate urinary calculi (1976)
    Springer
    Urological research 4 (1976), S. 125-128 
    Details
    ISSN: 1434-0879
    Keywords: Urinary calculi ; Whewellite ; Weddellite ; Stabilising factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 25 to 30% of calcium oxalate urinary calculi consist of the metastable Weddellite crystal phase. By fractionation of urine it was found that mineral substances are stabilising factors. The stability was checked in dry condition at room temperature, at 38°C and at 110°C. These results could be confirmed by precipitation from synthetic solutions. Mg, Zn, Ni, Co, Mn and Cu individually, and above all in combination, promote the formation of Weddellite. The formation of mixed crystal phases must be considered one of the main factors for the stabilisation of Weddelite in the urinary calculus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257168
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A contribution to the formation mechanism of calcium oxalate urinary calculi (1976)
    Springer
    Urological research 4 (1976), S. 157-160 
    Details
    ISSN: 1434-0879
    Keywords: Urinary calculi ; Weddellite ; Whewellite ; Formation mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In vitro investigations of the formation of Whewellite or Weddellite are described. By means of different precipitation models the influence of cationic minerals on the formation of Weddellite could be observed. The possible conversion of Weddellite into Whewellite in vivo is demonstrated by in vitro experiments. A theory of the formation of Weddellite or Whewellite urinary calculi is developed on the basis of the results obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262348
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A contribution to the formation mechanism of calcium oxalate urinary calculi (1976)
    Springer
    Urological research 4 (1976), S. 161-167 
    Details
    ISSN: 1434-0879
    Keywords: Urinary calculi ; Calcium oxalate ; Magnesium ; Solubility ; Crystallization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of magnesium in vitro on the precipitation of calcium oxalate was investigated. Even at maximum physiological magnesium concentrations a litholytic effect could not be observed, but the retardation of the calcium oxalate crystallization caused by magnesium might be decisive for a reduction in calculi formation. The enlargement of the calcium oxalate crystals and aggregates caused by the retardation of crystallization, however, should be regarded as a contraindicating factor for Mg therapy in oxalate calculous disease. It is safe to say that high magnesium concentrations prevent the conversion into Whewellite of the calcium oxalate calculi substance primarily formed as Weddellite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262349
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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