composition and antimicrobial activity of fatty acids detected in the hygroscopic secretion collected from the secretory setae of larvae of the biting midge forcipomyia nigra (diptera: ceratopogonidae).the hygroscopic secretion produced by the secretory setae of terrestrial larvae of the biting midge forcipomyia nigra (winnertz) was analysed using gas chromatography coupled with mass spectrometry (gc-ms). the viscous secretion is stored at the top of each seta and absorbs water from moist air. gc-ms analyses (four independent tests) showed that the secretion contained 12 free fatty acids, the most abundant of which were oleic (18:1), palmitic (16:0), palmitoleic (16:1) and linoleic (18:2). oth ...201222781366
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