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  • 1
    Electronic Resource
    Electronic Resource
    De novo biosynthesis of linoleic acid in two non-insect invertebrates: The land slug and the garden snail (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 919-921 
    Details
    ISSN: 1420-9071
    Keywords: Linoleic acid biosynthesis ; essertial fatty acid ; Δ 12 desaturase ; Bulimulis alternatus mariae ; Arion circumscriptus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The de novo biosynthesis of linoleic acid [18:2(n-6)], a fatty acid considered to be essential for most animals, was demonstrated in the land snail,Bulimulis alternatus mariae, and the garden slug,Arion circumscriptus. Radiolabeled acetate injected into the animals was incorporated into both 18:2 and 20:2, as demonstrated by radio-high performance liquid chromatography (radio-HPLC) and radio-gas chromatography (radio-GC). GC-mass spectrometry (GC-MS) of the methoxy derivatives of the 18:2 and 20:2 isolated from the snail showed that major isomers had the double bonds in the n-6,9 positions. Radio-gas-liquid chromatography (radio-GLC) of the ozonolysis products from the labeled dienoic fatty acid methyl esters showed that both ends of the molecules were labeled, confirming de novo synthesis. The production of linoleic acid by these animals suggests the capability to produce linoleic acid may be widespread in invertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952610
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  • 2
    Electronic Resource
    Electronic Resource
    Alkadienes mediating courtship in the parasitoidCardiochiles nigriceps (Hymenoptera: Braconidae) (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 1971-1989 
    Details
    ISSN: 1573-1561
    Keywords: Cardiochiles nigriceps ; parasitoid ; Hymenoptera ; Braconidae ; pheromone ; mating ; courtship ; hydrocarbon ; cuticle ; alkadienes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Courtship inCardiochiles nigriceps (Viereck) (Hymenoptera: Braconidae) involves male attraction to females and male antennation of females followed by mounting and copulation. Once the female is located, antennation and mounting of the female are mediated by the hydrocarbon fraction of female's Dufour's gland and cuticle. The identification of the cuticular hydrocarbons of males and females revealed a mixture of alkanes and alkenes, in addition to a series of alkadienes specific to females. These female-specific alkadienes reported from Braconidae are unusual among insect alkadienes in that the second double bond occurs in the middle of the molecule. Bioassays with three available alkadienes revealed that contact behaviors (antennation and mounting) are in part mediated by the (Z,Z)-7, 13-heptacosadiene and at least one other alkadiene in combination with other hydrocarbons found in males and females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033856
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