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  • Steroids  (2)
  • Key words contamination  (1)
  • 1
    ISSN: 1435-0157
    Keywords: Key words contamination ; vulnerability ; groundwater protection ; South Korea ; urban groundwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé La contamination de l'eau souterraine devient un problème environnemental majeur en Corée du Sud, en relation avec le développement industriel bien marqué et l'explosion démographique. Meme dans les zones rurales, l'utilisation accrue d'engrais et de pesticides, le drainage acide de mines et les rejets croissants d'eaux usées contribuent à la pollution des nappes. Le modèle DRASTIC/EGIS a été utilisé pour évaluer le potentiel de contamination des eaux souterraines dans la région de la ville de Cheongju, la première de plusieurs régions pilotes. Le modèle permet de définir des ensembles hydrogéologiques dans la région étudiée, à partir de la description composite de tous les facteurs géologiques et hydrogéologiques essentiels pour chaque ensemble. Ensuite, un schéma pour le classement des facteurs hydrogéologiques est mis en oeuvre pour évaluer la vulnérabilité relative à la contamination des eaux souterraines pour chaque ensemble. DRASTIC/EGIS peut servir d'outil d'évaluation du potentiel de pollution et ainsi faciliter des plans de protection des ressources en eau souterraines.
    Abstract: Resumen La contaminación de aguas subterráneas, debida a la expansión industrial y al fuerte crecimiento demográfico, supone un gran problema medioambiental en Corea del Sur. También en áreas rurales, el incremento en el uso de fertilizantes y pesticidas, el drenaje de minas y el aumento de los caudales de aguas residuales provocan un aumento de la contaminación. Para evaluar el riesgo de contaminación de las aguas subterráneas en el área de la ciudad de Cheongju, el primero de una serie de estudios piloto, se utilizó el modelo DRASTIC/EGIS. Este modelo permite la zonificación del área de estudio, basada en consideraciones geológicas e hidrogeológicas. En cada una de las zonas se aplica un esquema de clasificación que evalúa su vulnerabilidad relativa. El modelo DRASTIC/EGIS puede servir como una herramienta para evaluar el riesgo potencial de contaminación que facilite la creación de programas de protección de los recursos subterráneos.
    Notes: Abstract  Groundwater contamination is becoming a major environmental problem in South Korea with the marked expansion of the industrial base and the explosive growth of the population. Even in rural areas, the increased use of fertilizers and pesticides, the presence of acid-mine drainage, and increase of volumes of domestic wastewaters are adding to groundwater pollution. The DRASTIC/EGIS model was used to evaluate the potential for groundwater contamination in the Cheongju city area, the first of several pilot studies. The model allows the designation of hydrogeologic settings within the study area, based on a composite description of all the major geologic and hydrogeologic factors for each setting. Then, a scheme for relative ranking of the hydrogeologic factors is applied to evaluate the relative vulnerability to groundwater contamination of each hydrogeologic setting. DRASTIC/EGIS can serve as a tool to evaluate pollution potential and so facilitate programs to protect groundwater resources.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 453-459 
    ISSN: 0170-2041
    Keywords: Degradation, thermal ; Thermolysis ; Glycosides ; Carbohydrates ; Triterpenoids ; Steroids ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this paper the hydrothermolysis of triterpenoid and steroid glycosides is described. By mere heating with water or water/1,4-dioxane solution, the triterpenoid and steroid glycosides 1, 4 and 15, 16, 25, 29, respectively, are converted into their aglycones and prosapogenins. Furthermore, hydrothermolysis of the triterpenoid 3,28-O-bisglycosides 5, 6, 8, 9, 12 affords the corresponding 3-O-glycosides and reduced oligosaccharides formed by selective cleavage of the ester glycosidic linkage. It is expected that this hydrothermolysis is useful for the structure determination of some triterpenoid and steroid glycosides and for yielding new oligosaccharides. The hydrothermolyzed products have been isolated by chromatography and their structures elucidated by spectroscopic methods.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 575-579 
    ISSN: 0170-2041
    Keywords: Thermolysis ; Degradation, thermal ; Carbohydrates ; Glycosides ; Cardenolides ; Steroids ; Flavonoids ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydrothermolysis of cardenolide and flavonoid glycosides is described. On heating with water or water/dioxane, cardenolide (1, 5, 11) and flavonoid glycosides (16, 20, 23, 27) are converted into their genuine aglycones and partially hydrolyzed products, together with saccharide components. Meanwhile, the glycosidic linkage of 2-deoxy sugar moieties in cardenolide glycosides is more readily cleaved than that of the common sugar moieties by means of hydrothermolysis. Therefore, hydrothermolysis of the uzarigenin triglycoside (13), bearing a 2-deoxy sugar moiety which is directly attached to the aglycone, leads to selective cleavage of the sugar - aglycone linkage. The hydrothermolyzed products have been isolated by chromatography and their structures elucidated by spectroscopic methods.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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