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Gas chromatographic analysis and electroantennographic detection (GC-EAD) of ten pooled headspace samples of Anacamptis coriophora using an antenna of a Bombus terrestris queen. Two compounds, hydroquinone dimethyl ether and anisaldehyde, showed a consistent physiological response (arrows) in antennae of Bombus terrestris and Apis mellifera. FID: flame ionization detector trace from the gas chromatograph; EAD: electroantennographic detection trace from the antenna.
