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  • Coccinellidae  (3)
  • steroids  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Defensive use of an acquired substance (carminic acid) by predaceous insect larvae (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 610-615 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Quinone ; Coccidae ; Coccinellidae ; Chamaemyiidae ; Pyralidae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Larvae of two insects, a coccinellid beetle (Hyperaspis trifurcata) and a chamaemyiid fly (Leucopis sp.), feed on cochineal insects and appropriate their prey's defensive chemical, carminic acid, for protective purposes of their own.H. trifurcata discharges the chemical with droplets of blood (hemolymph) that it emits when disturbed;Leucopis sp. ejects the compound with rectal fluid. Ants are thwarted by these defenses, which are compared with the previously-described defense of a pyralid caterpillar (Laetilia coccidivora) that disgorges carminic acid-laden crop fluid. The defensive fluid of all three larvae contains carminic acid at concentrations spanning a range (0.2–6.2%) proven deterrent to ants. Many insects are known to appropriate defensive substances from plants. Insects that acquire defensive chemicals from animal sources may be relatively rare.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01921733
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  • 2
    Digitale Medien
    Digitale Medien
    Tocopheryl acetates from the pupal exocrine secretion of the squash beetle,Epilachna borealis (Coccinellidae) (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 616-620 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Vitamin E acetate ; tocopherol ; beetle ; Coccinellidae ; defensive secretion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract The oily droplets on the pupal integumental hairs of the squash beetleEpilachna borealis contain a mixture of α-, β-, γ-, and δ-tocopheryl acetates as major constituents. In addition, the secretion contains a number of minor components that appear to be dehydrocongeners of the major components. This is the first report of the occurrence of acetate esters of any tocopherol in nature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01969741
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  • 3
    Digitale Medien
    Digitale Medien
    Defensive steroids from a carrion beetle (Silpha americana) (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 516-519 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Coleoptera ; chemical defense ; steroids ; pregnanes ; isoprenoids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The defensive anal effluent discharged bySilpha americana in response to disturbance contains a mixture of steroids stemming from a glandular annex of the rectum. The compounds have been characterized as 15β-hydroxyprogesterone (1, principal component), 5β-pregnan-15β-ol-3, 20-dione (2), 5β-pregnan-3α, 15β-diol-20-one (3), 5β-pregnan-7β, 15β-diol-3,20-dione (4), 5β-pregnan-3α, 7β, 15β-triol-20-one (5), 5β-pregnan-16α-ol-3,20-dione (6), and 5β-pregnan-3α, 16α-diol-20-one (7), none previously found in insects. Bioassays with jumping spiders showed compounds1 and6 to be feeding deterrents at the 1 μg level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01966178
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  • 4
    Digitale Medien
    Digitale Medien
    Antiinsectan Activity of Epilachnene, a Defensive Alkaloid from Pupae of Mexican Bean Beetles (Epilachna varivestis) (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 391-397 
    Details
    ISSN: 1573-1561
    Schlagwort(e): chemical defense ; Coccinellidae ; alkaloid ; azamacrolide ; bioassay ; feeding deterrent ; irritant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Epilachnene [(5Z)-11-propyl-12-azacyclotetradec-5-en-14-olide], the principal component of the secretion of the pupal defensive hairs of the Mexican bean beetle (Epilachna varivestis), has antiinsectan activity. Both the R enantiomer of epilachnene, and the S enantiomer (the natural configuration of the compound), proved deterrent in a feeding bioassay with a predaceous coccinellid beetle (Harmonia axyridis). Moreover, both enantiomers proved active in a topical irritancy test with a cockroach (Periplaneta americana).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005457321701
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  • 5
    Digitale Medien
    Digitale Medien
    Defensive steroids from a carrion beetle (Silpha novaboracensis) (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 35-38 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Coleoptera ; Silphidae ; Silpha novaboracensis ; steroids ; pregnanes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Two novel steroids, 3α,7β-dihydroxy-14β-pregn-4-en-15,20-dione (1) and 3α,7β, 20ξ-trihydroxy-14β-pregn-4-en-15-one (4), have been characterized from the rectal gland ofSilpha novaboracensis (Coleoptera: Silphidae). Judging from the function of comparable pregnanes in another species ofSilpha, the compounds may play an antipredator role.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01020349
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