Odor capture by pectinate antennae – Mourad Jaffar-Bandjee

Mourad Jaffar-Bandjee
IRBI, Université de Tours

Date(s) : 10/02/2021   iCal
14 h 00 min - 15 h 00 min

In some moth species, male adults possess pectinate antennae which detect sexual pheromones emitted by females. A critical step in the olfaction process is the capture of pheromone molecules which depends heavily on the shape of the antenna. Pectinate antennae are however difficult to study because they are multi-scale objects spanning over four orders of sizes, depending on the structural elements. We focused on the species Samia cynthia and split its antenna in two levels, the macro- and the microstructures, and studied them separately. In both cases, we used Additive Manufacturing to build artificial scaled up models and Particle Image Velocimetry to determine their respective leakiness, the proportion of flow deflected from an object. We then adapted a heat transport model to calculate the mass transport problem of pheromone capture by the microstructure. Using FEM simulations, we combined the two levels and determined the capture efficiency of the entire antenna. We compared it with a cylindrical one and showed that a pectinate antenna is a good design to increase the surface of the antenna without significantly decreasing the capture efficiency.


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