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  • 1
    Digitale Medien
    Digitale Medien
    Transition-state structures for describing the enzyme-catalyzed mechanisms of rubisco (1999)
    Springer
    Theoretical chemistry accounts 101 (1999), S. 234-240 
    Details
    ISSN: 1432-2234
    Schlagwort(e): Key words: Rubisco mechanism ; Transition-state structures ; Ab initio calculations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract. The carboxylation and oxygenation processes of a model substrate, 3,4-dihydroxy-2-pentanone, have been theoreticaly characterized as a set of steps, mimicking the corresponding reactions of D-ribulose-1,5-bisphosphate catalyzed by rubisco. A theoretical characterization is carried out of transition-state structures and possible molecular intermediates represented as saddle points of index 1 and minimum energy structures, respectively. The quantum chemical characterization, at the HF/3-21G calculation level, of these stationary points is used to rationalize and to discuss both catalyzed sequences. The reported set of these stationary points maps out most experimental aspects of the reaction pathways for the real system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002140050435
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    H-point standard additions method for resolution of overlapped chromatographic peaks with a conventional fluorescence detector. Determination of phenol and cresols in waters (1996)
    Springer
    Chromatographia 42 (1996), S. 283-289 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Peak overlap ; Fluorescence detection ; H-Point standard additions method ; Water analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The H-Point Standard Additions Method (HPSAM) is proposed in order to resolve overlapping peaks in liquid chromatography by using a conventional fluorescence detector. The method uses as analytical signals the heights or the areas obtained at two previously selected emission wavelengths, and good results are obtained for highly overlapping peaks with highly overlapping fluorescence spectra. The principal benefits of the method are the ease of finding the required wavelengths, its insensitivity to changes in the retention time of the peak from one injection to another, and the possibility of using it in highly or only partially overlapping peaks. We have applied the method to the determination of phenol and cresols in water, resolving by the proposed method the overlapping peaks ofm- andp-cresol.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02290310
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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