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  • Artikel: DFG Deutsche Nationallizenzen  (4)
  • Chemistry  (2)
  • Urine  (2)
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  • Artikel: DFG Deutsche Nationallizenzen  (4)
Materialart
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  • 1
    Digitale Medien
    Digitale Medien
    Use of the computer program EQUIL to estimate pH in model solutions and human urine (1989)
    Springer
    Urological research 17 (1989), S. 157-161 
    Details
    ISSN: 1434-0879
    Schlagwort(e): EQUIL ; pH computations ; Titrations ; HEPES ; Urine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The computer program EQUIL was designed to calculate relative supersaturations of solute components of common urinary stones. In an extended software version, quantitative consideration of charge balance for a priori or a posteriori pH estimation was added. The reliability of this computation was tested with hydrogen ion titration of buffer solutions containing HEPES [N-(2-hydroxyethyl)piperaizine-N′-ethanesulfonic acid] as well as samples of normal human urine. In the model solutions with HEPES, the difference between calculated pH values and the measured pH was smaller than 1.2% for any titration step within the buffer zone (pH 8.5-6.8). The pH values calculated for whole urine differed from the measured pH by 7% to 53%, and the calculated charge inbalance ranged from 2.6 to 9.6 mM. This net cation inbalance indicates that there is a need to account for other anionic components, including hippurate, amino acids, and isocitrate. In experimental solutions, charge balance calculations with EQUIL can be of great utility because they permit a priori estimation of pH or computation of the composition at a desired pH.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256243
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Rapid method of measuring the inhibition of calcium-oxalate monohydrate growth in urine (1990)
    Springer
    Urological research 18 (1990), S. 219-222 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Inhibitors ; Calcium-oxalate monohydrate growth ; Pyrophosphate ; Citrate ; Urine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In order to have a rapid method of measuring the inhibition of calcium-oxalate monohydrate growth in freshly voided whole urine, a test system by Meyer and Smith that has originally been developed for diluted urine was modified. The crystallization processes were monitored by an ion-selective calcium electrode, which allowed determination of the half-life value of the decrease in calcium within 25 min. Even given the high inhibitory activity of whole urine, the test gave reliable results when a high seed concentration was used. Inhibition was expressed as the ratio between the half-lives of the calcium decrease obtained in the presence and in the absence of inhibitors. This approach allowed kinetic studies of individual inhibitors in model solutions. Furthermore, the measurements of inhibitors in urine could be, performed before the chemical composition was determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00295851
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Über den Mytilit, eine natürlich vorkommende Cyclose (1921)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 54 (1921), S. 1938-1943 
    Details
    ISSN: 0365-9631
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19210540822
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Das Trimethylamin-oxyd als biologischer Wasserstoff-Acceptor (1926)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 59 (1926), S. 2750-2751 
    Details
    ISSN: 0365-9631
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19260591112
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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