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J Comp Physiol A Neuroethol Sens Neural Behav Physiol

Title:		Dynamic properties of Drosophila olfactory electroantennograms
Author(s):		Schuckel J; Meisner S; Torkkeli PH; French AS;
Address:		"Department of Physiology and Biophysics, Dalhousie University, B3H 1X5, Halifax, NS, Canada"
Journal Title:		J Comp Physiol A Neuroethol Sens Neural Behav Physiol
Year:		2008
Volume:		20080305
Issue:		5
Page Number:		483 - 489
DOI:		10.1007/s00359-008-0322-6
ISSN/ISBN:		0340-7594 (Print) 0340-7594 (Linking)
Abstract:		"Time-dependent properties of chemical signals are probably crucially important to many animals, but little is known about the dynamics of chemoreceptors. Behavioral evidence of dynamic sensitivity includes the control of moth flight by pheromone plume structure, and the ability of some blood-sucking insects to detect varying concentrations of carbon dioxide, possibly matched to host breathing rates. Measurement of chemoreceptor dynamics has been limited by the technical challenge of producing controlled, accurate modulation of olfactory and gustatory chemical concentrations over suitably wide ranges of amplitude and frequency. We used a new servo-controlled laminar flow system, combined with photoionization detection of surrogate tracer gas, to characterize electroantennograms (EAG) of Drosophila antennae during stimulation with fruit odorants or aggregation pheromone in air. Frequency response functions and coherence functions measured over a bandwidth of 0-100 Hz were well characterized by first-order low-pass linear filter functions. Filter time constant varied over almost a tenfold range, and was characteristic for each odorant, indicating that several dynamically different chemotransduction mechanisms are present. Pheromone response was delayed relative to fruit odors. Amplitude of response, and consequently signal-to-noise ratio, also varied consistently with different compounds. Accurate dynamic characterization promises to provide important new information about chemotransduction and odorant-stimulated behavior"
Keywords:		"Animals Chemoreceptor Cells/*physiology Drosophila Electrophysiology Odorants Olfactory Pathways/*physiology Olfactory Receptor Neurons/*physiology Pheromones/physiology Receptors, Odorant/*physiology;"
Notes:		"MedlineSchuckel, Julia Meisner, Shannon Torkkeli, Paivi H French, Andrew S eng Research Support, Non-U.S. Gov't Germany 2008/03/06 J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2008 May; 194(5):483-9. doi: 10.1007/s00359-008-0322-6. Epub 2008 Mar 5"