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  • 1
    Electronic Resource
    Electronic Resource
    Phytoalexins from Brassica (Cruciferae) as oviposition stimulants for the cabbage root fly, Delia radicum (1998)
    Springer
    Chemoecology 8 (1998), S. 163-168 
    Details
    ISSN: 1423-0445
    Keywords: Key words. phytoalexin – brassinin – indole – oviposition behaviour –Brassica– Cruciferae –Delia radicum– Diptera –Erwinia carotova–Pseudomonas– Bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. Bacteria species known to induce the biosynthesis of crucifer-specific phytoalexins have earlier been shown to be associated with Delia flies. Eleven crucifer-specific phytoalexins and related synthetic compounds were applied on surrogate paper leaves and offered to cabbage root flies in oviposition assays. Since three of these compounds (methoxybrassinin, cyclobrassinin, brassitin) proved to be significantly stimulatory whereas the remaining metabolites had no effect, the reaction of the fly appears to be structure-specific. Inactive phytoalexins had no inhibitory effect on oviposition. 100 μg of methoxybrassinin per surrogate leaf was as stimulatory as 0.05 gle (gram leaf equivalent) of a methanolic host-leaf (Brassica oleracea) extract. Thus the three active phytoalexins can explain only part of the activity of host-pant extracts but might induce a preference for infected plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000490050021
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  • 2
    Electronic Resource
    Electronic Resource
    A new approach in exciton-coupled circular dichroism (ECCD) - insertion of an auxiliary stereogenic centerDr. Nina Berova is on leave from the Bulgarian Acadamy of Sciences, Sofia 1113, Bulgaria. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 7 (1995), S. 128-135 
    Details
    ISSN: 0899-0042
    Keywords: allene ; absolute configuration ; chirality ; method ; synthesis ; resolution ; chromophore ; HPLC ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: There are cases in which exciton coupling between two chromophores does not occur because the two electric transition moments which should interact are coplanar. This is seen with cyclohexane-1,4-diols (both ee or ea) and a wide variety of 3-hydroxy carotenoids, 3-hydroxyretinoids, etc. A general approach to deal with such cases is to acylate one of the hydroxyl groups with a chiral allenic acid substituted with a suitable chromophore, e.g., CHROM—CH=C=CH-COOH. The allenic bond introduces a 90° twist at the italicized central carbon so that the allenic CHROM now couples with the second chromophore. This concept of introducing an auxiliary allenic center should be of general applicability in other similar cases. © 1995 Wiley-Liss, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530070304
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