Responses of the infrared sensilla of Melanophila acuminata (Coleoptera: Buprestidae) to monochromatic infrared stimulation |
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Authors: | H Schmitz M Mürtz H Bleckmann |
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Institution: | Institut für Zoologie der Rheinischen Friedrich-Wilhelms-Universit?t Bonn, Poppelsdorfer Schloss, D-53115 Bonn, Germany e-mail: h.schmitz@uni-bonn.de Tel.: +49-228-735494; Fax: +49-228-735458, DE Institut für Angewandte Physik der Rheinischen Friedrich-Wilhelms-Universit?t Bonn, Wegelerstr. 8, D-53115 Bonn, Germany, DE
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Abstract: | The pit organs of the beetle Melanophilaacuminata were stimulated with monochromatic infrared radiation using a continuous wave CO overtone infrared laser. Best sensitivity
was in the wavelength range 2.8–3.5 μm. In this range a stimulus intensity of 14.7 mW cm−2 was sufficient to generate single action potentials. At a wavelength of 5 μm receptor performance significantly decreased.
An increase in stimulus intensity caused a decrease in response latency and an increase in the number of action potentials
elicited. At a given wavelength (3.4 μm) the dynamic amplitude range of action potential responses covered 12 dB. At high
stimulus intensities (94.2 mW cm−2) a stimulus duration of 4 ms was sufficient to generate one to two action potentials and a stimulus duration of 60 ms already
caused response saturation (with up to nine action potentials). In a repetitive stimulus regime distinct receptor potentials
were visible up to a frequency of 600 Hz.
Accepted: 18 March 2000 |
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Keywords: | Melanophila Infrared receptor Mechanoreceptor Insect cuticle Remote sensing |
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