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Chemical defence in chrysomelid larvae and adults
Abstract The defensive secreation of several species of chrosomelid larvae and adults have been analyzed. Salicyaldehyde and some already known methylcyclopentanoid monoterpenes have been identified
Ladybird defence alkaloids: Structural, chemotaxonomic and biosynthetic aspects (Col.: Coccinellidae)
The defensive mechanisms which protect ladybird beetles (Coccinellidae) against predators are reviewed, and particular emphasis is laid on the repellent alkaloids which are contained in the haemolymph of many species.
New Hapalindoles from the Cyanophyte Hapalosiphon laingii
Seven indole alkaloids have been isolated from the cultured cyanophyte Hapalosiphon laingii. In addition to the known metabolites 12-epi-hapalindole E isonitrile [1], 12-epi-hapalindole C isonitrile
Insect chemical defense
Research on the defensive chemistry of insects during the last decade is reviewed, with special emphasis on non-volatile compounds. The isolation and structure determination of defensive chemicals,
Novel polycyclic guanidine alkaloids from two marine sponges of the genus Monanchora.
Two marine sponges of the genus Monanchora have been found to contain new polycyclic guanidine alkaloids bearing the (5,6,8b)-triazaperhydroacenaphthylene skeleton, determined by detailed spectroscopic analysis.
Polycyclic guanidine alkaloids from the marine sponge Crambe crambe and Ca++ channel blocker activity of crambescidin 816.
Four pentacyclic guanidine derivatives related to ptilomycalin A have been isolated from the Mediterranean sponge Crambe crambe and were found to have a potent Ca++ antagonist effect and to inhibit the acetylcholine-induced contraction of guinea pig ileum at very low concentrations.
Cyanogenic and other glucosides in a neo-guinean bug Leptocoris isolata: Possible precursors in its host-plant
Two new glucosides were isolated from the hemolymph of adult Leptocoris isolata (Heteroptera) and the cyanogenic glucoside cardiospermin was found in whole adult bug extracts.
Chemical defences in leaf beetles and their larvae: The ecological, evolutionary and taxonomic significance
The volatile irritants produced by the larvae are well suited to repel small arthropods, whereas poisons associated with aposematic coloration in the adults could be directed against small vertebrates, such as birds.
Inhibition of iodide transport in thyroid cells by dysidenin, a marine toxin, and some of its analogs.
Dysidenin, a hexachlorinated tripeptide-like molecule extracted from the sponge Dysidea herbacea, has lethal effects on fishes and some marine organisms and data obtained showed that the inhibition is sensitive to stereochemical effects and that the trichloromethyl terminus of the molecule is recognized by the binding site.