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Salicin from host plant as precursor of salicylaldehyde in defensive secretion of Chrysomeline larvae
It is demonstrated that salicylaldehyde is derived from salicin, a phenylglucoside present in the leaves of the host plant, and is a more potent deterrent than saligenin orsalicin. Expand
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 identifiedExpand
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. Expand
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 isonitrileExpand
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,Expand
Identification of a novel cardenolide (2''-oxovoruscharin) from Calotropis procera and the hemisynthesis of novel derivatives displaying potent in vitro antitumor activities and high in vivo
Analysis of the methanolic extract of Calotropis procera root barks enabled the identification of a novel cardenolide (2''-oxovoruscharin) to be made, which exhibited in vitro antitumor activity higher than SN-38 and two of the most potent drugs used in hospitals to combat cancer. Expand
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. Expand
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. Expand
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. Expand