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  • 1985-1989  (3)
  • Calcium oxalate  (2)
  • 25.85.Ca  (1)
  • 25.70.CD
  • 25.70.Jj
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Chemical factors governing the state of saturation towards brushite and whewellite in urine of calcium stone formers (1987)
    Springer
    Urological research 15 (1987), S. 63-65 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Calcium stones ; Urinary supersaturation ; Calcium oxalate ; Brushite
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Variations of urinary pH and concentrations of calcium, phosphate, oxalate, magnesium and citrate have been produced by 4 different diets given to 19 idiopathic calcium stone formers. The state of saturation towards whewellite and brushite was directly measured in the 76 urine samples by equilibration with the corresponding salts and was compared to chemical constituents by regression analyses. The state of saturation towards calcium oxalate monohydrate was significantly governed only by the urinary oxalate concentration, and a soluble oxalate fraction not contributing to calcium oxalate chelation was demonstrated. The state of saturation towards brushite was exclusively determined by urinary calcium and pH, the latter below 5.5 showing a high influence on brushite solubility.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00260934
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The influence of hydroxyapatite and pyrophosphate on the formation product of calcium oxalate at different pHs (1989)
    Springer
    Urological research 17 (1989), S. 153-155 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Calcium oxalate ; Heterogeneous nucleation and growth ; Inhibitors ; Pyrophosphate ; Hydroxyapatite
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The nucleating effect of hydroxyapatite (HAP) and the inhibitory effect of pyrophosphate (PPi) on calcium oxalate crystallization have been studied at different pH's in solution metastabely supersaturated with respect to calcium oxalate but saturated with respect to HAP. Crystallization was monitored by a decrease of calcium in the supernatant and formation products were calculated. At a pH above 6.0 already minimal HAP concentrations proved to be a suitable substrate for heterogeneous nucleation and growth of calcium oxalate. PPi showed a pronounced inhibitory effect on spontaneous as well as on HAP induced crystallization of calcium oxalate, this effect being highly pH dependent. HAP was found to neutralize the inhibitory effect of PPi in a molar ratio of 10:1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256242
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  • 3
    Digitale Medien
    Digitale Medien
    Element 107 (1989)
    Springer
    The European physical journal 333 (1989), S. 163-175 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.60.+e ; 25.70.3f ; 25.85.Ca ; 27.9.+6
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We identified twoα-emitting isotopes of element 107 with masses of 261 and 262 respectively by parent-daughter correlations. For the isotope with mass 262 we found two transitions with (102±26) ms and (8.0±2.1) ms half-life, which we assign to the groundstate and to an isomeric transition, respectively. The half-life of the isotope with mass 261 is (11.8 −2.8 +5.3 ) ms. Spontaneous fission, which could be assigned to the decay of an isotope of element 107, was not detected in our experiments. This observation is in-line with our previous results, indicating a region of nuclei with strong microscopic stabilisation in the trans-actinides. Both new isotopes were produced by complete fusion of209Bi with54Cr. The production cross sections are (163±34) pb for262107 and (36 −14 +22 ) pb for261107.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565147
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