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  • 1
    ISSN: 1432-1459
    Keywords: Huntington's disease ; Positron emission tomography ; Regional cerebral glucose consumption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Controversial data have been reported with regard to the diagnostic value of the positron emission tomographic (PET) measurement of striatal glucose consumption (rCMRGlc) in chorea-free subjects at risk of Huntington's disease (HD). For further clarification of this issue we measured striatal and cerebellar rCMRGlc in 27 chorea-free subjects at risk of HD, 20 patients with manifest HD and 20 control subjects, using PET and18F-fluorodeoxyglucose. In 6 of the at-risk subjects cerebellar ratios of striatal rCMRGlc were decreased below the corresponding 99% confidence limit determined in the controls. This indicates that the PET measurement of rCMRGlc may, indeed, be valuable in establishing the diagnosis of incipient HD in presymptomatic at-risk subjects.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1618-2650
    Keywords: Analyse von Aminosäuren undα-Ketosäuren ; Chromatographie ; Ionenaustausch ; Pyridoxylderivate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Analyse von Aminosäuren werden deren Pyridoxylderivate hergestellt und durch Flüssigkeits-Chromatographie getrennt. Die Bestimmung im Eluat erfolgt über die UV- oder Fluorescenzspektren oder durch Aktivitätsmessung, wenn radioaktives NaBT4 bei der Darstellung verwendet wird. Diese letzte Methode ist die empfindlichste. Die Empfindlichkeit kann bis zu 10−13 Mol gesteigert werden (Fehler ± 5%). Das Verfahren kann ebenfalls für die Analyse vonα-Ketosäuren eingesetzt werden.
    Notes: Abstract The synthesis of pyridoxyl-amino acids and their separation by liquid chromatography is described. The determination of the compounds in the eluate can be performed optically via the UV- or fluorescence spectra or radiochemically by activity measurement when radioactive NaBT4 is used in the preparation. The latter method is the most sensitive one. Sensitivity can be increased up 10−13 Mol (error ± 5%). The procedure described can also be applied to the separation and determination ofα-keto acids.
    Type of Medium: Electronic Resource
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