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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 31 (1992), S. 2555-2557 
    ISSN: 0031-9422
    Keywords: Asteraceae ; Bellis perennis ; asterogenic acid. ; bayogenin ; bellissaponins BS4, BS5, BS6 and BS7 ; triterpenoid saponins ; underground parts
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 30 (1991), S. 627-631 
    ISSN: 0031-9422
    Keywords: Asteraceae ; Bellis perennis ; bellissaponins BA"1 and BA"2. ; triterpenoid saponins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 36 (1994), S. 449-453 
    ISSN: 0031-9422
    Keywords: Asteraceae ; Bellium bellidioides ; bayogenin ; bellidioside A ; bellissaponin BSI ; polygalacic acid. ; triterpenoid saponins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Clinical oral investigations 1 (1998), S. 163-168 
    ISSN: 1436-3771
    Keywords: Key words Ceramics ; Inlays ; Clinical trial ; Quantitative margin analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of this clinical study was to evaluate feldspathic ceramic inlays both by clinical criteria and quantitative margin analysis in continuation of an earlier, identically conducted 2-year study. Fifty feldspathic ceramic inlays were adhesively luted in Class II preparations with all margins located in enamel. The inlays were evaluated clinically according to modified USPHS criteria after 3 and 4 years. Quantitative margin analysis was performed with a scanning electron microscope (SEM). Clinically, the inlays showed no recurrent caries and no changes in colour, but superficial marginal discolouration (6%) was apparent after 4 years. Margins were perceptible clinically in 64% of the cases after 4 years. Quantitative margin analysis showed significantly more marginal gaps at the composite/ceramic interface than at the enamel/composite interface. There was neither a significant decrease in perfect margins nor a significant increase in marginal gaps and marginal imperfections at both interfaces between the third and fourth year. Clinically, the inlays performed very well up to 4 years. Clinical evaluation using an explorer only detected substance loss in the cementation gap. The SEM evaluation showed significantly higher changes in marginal qualities during the first 2-year interval of clinical service compared to the second 2-year interval following an exponential mathematical regularity. Quantitative margin analysis should be included in clinical long-term trials to detect early marginal deficiencies at the luting interfaces.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 280 (1976), S. 293-297 
    ISSN: 1618-2650
    Keywords: Trennung von Polysulfiden, aliphat. ; Chromatographie, Säulen ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aliphatische Di- und Polysulfide lassen sich im reverse-phase-Verfahren an einer chemisch gebundenen Octadecylphase (Micro-Pak-CH) mit MeOH-H2O als Eluens sauber trennen. Die qualitative Zuordnung der Peaks wird durch folgende Effekte vereinfacht: 1. log k′ nimmt bei konstanter S-Zahl linear mit der C-Zahl zu; 2. log k′ nimmt bei konstantem Alkylrest linear mit der S-Zahl zu; 3. log k′ fällt linear mit zunehmendem Gehalt des Eluens an MeOH. Bei Auswahl eines geeigneten Eluensgradienten können homologe Reihen wie R 2 S 2 mit R = Methyl bis R = Hexyl oder R 2 S x mit x = 2−7 mit einer Auflösung Res ∼ 2 zwischen allen Komponenten getrennt werden. Die Polysulfide werden bei diesen Trennungen nicht verändert.
    Notes: Abstract Aliphatic di- and polysulphides were separated by reverse-phase bonded-phase liquid chromatography. Chemically bonded octadecyl groups formed the stationary phase, mixtures of water and methanol were the mobile phase. For the qualitative analysis of polysulphide mixtures the following findings are important: 1. With constant S-number log k′ increases linearly with the C-number. 2. With constant hydrocarbon group log k′ increases linearly with the S-number. 3. log k′ decreases linearly with increasing methanol percentage in the eluent. With proper choice of gradient homologous series like R 2 S 2 with R = methyl to R = hexyl or R 2Sx with x = 2 ... 7 could be separated with a resolution of about 2 between all components. The polysulphides are not altered during these separations.
    Type of Medium: Electronic Resource
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