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  • 1
    Electronic Resource
    Electronic Resource
    In search of allelopathy in the Florida scrub: The role of terpenoids (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 1355-1380 
    Details
    ISSN: 1573-1561
    Keywords: Calamintha ashei (Labiatae) ; Conradina canescens (Labiatae) ; Chrysoma pauciflosculosa (Asteraceae) ; Ceratiola ericiodes (Empetraceae) ; terpenoids ; allelopathy ; mechanisms of release ; water transport ; activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The hypothesis was tested that allelopathic agents released from fire-sensitive plants of the Florida scrub community deter the invasion of fireprone sandhill grasses. The structures of the constituents of four endemic scrub species,Conradina canescens, Calamintha ashei, Chrysoma pauciflosculosa, andCeratiola ericiodes, were established and their phytotoxic activity against two grasses of the sandhill was examined. Effects of the secondary metabolites from the above scrub species and their degradation products upon the germination and radicle growth of little bluestem (Schizachyrium scoparium) and green sprangletop (Leptochloa dubia), two native grasses of the Florida sandhill community, were determined. The studies included determination of the water solubility and release mechanism of terpenes and other allelopathic agents from the source plants and their aqueous transport to the target species. Some of the natural products were nontoxic until activated by light and/or oxidation after release from the source plant into the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059812
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of a 2-Methylcyclodopa Derivative (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1937-1939 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Herstellung von O,O-Diacetyl-S-2-methylcyclodopa-methylester (7) durch Oxydation von S-2-Methyldopa-methylester (4) und anschliessende Reduktion und Acetylierung ist beschrieben. Im Gegensatz zu Cyclodopa (2) wird 2-Methylcyclodopa-methylester (6) am Stickstoff durch Acetanhydrid und Pyridin nicht acetyliert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530745
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  • 3
    Electronic Resource
    Electronic Resource
    Biosynthesis of Betalaines. On the Cleavage of the Aromatic Ring during the Enzymatic Transformation of Dopa into Betalamic Acid (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 649-658 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der enzymatischen Umwandlung von 3′,4′-Dihydroxyphenylalanin (Dopa) in Betalaminsäure, in Betalain-haltigen Centrospermen, wird der aromatische Ring an der Bindung neben den beiden Hydroxylgruppen (C(4′)—-C(5′)) und nicht zwischen den Hydroxyl gruppen (C(3′)—-C(4′)) gespalten. Dies ergab sich aus dem Einbau von L-Tyrosin-[3′,5′-3H] in Betanin mit Kaktusfruchtmiaterial. Das [3H]-Betanin und das daraus durch Hydrolyse erhaltene Betanidin enthielten ∼90% des Tritiums am C(11), denn nach Behandlung des Betanins mit Prolin fanden sich ∼90% der Radioaktivität im Indicaxanthin und nur ∼10% im Cyclodopaderivat, und Behandlung des Betanidins mit CF3COOH bewirkte keine Radioaktivitätsverminderung durch 1H-3H-Austausch.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550240
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectra of germacranolide type sesquiterpene dilactones and derivatives (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 325-329 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low and high resolution mass spectra of five germacranolide sesquiterpene dilactones together with the d0-, d3-acetates, d0-, d9-TMSi derivatives and deuterium exchange products were obtained. The mass spectra of the five dilactones revealed several kinds of common fragment ions. The germacranolides containing a 4,5 double bond exhibit characteristic ions at m/e 274, 256, 228, 165 and 147, while the 4,5-dihydro compound exhibits fragment ions at m/e 276, 258, 230 and 162.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210130606
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