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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2015年52 No.5

A parallel equivalent electrocircuit model of the electroantennogram signals of male Bombyx mori
Author of the article:SU Jun** LI Ya-Ru ZHONG Di LU Chao CHEN Min-Jia WANG Shi-Fa*** ZHAO Bo-Guang***
Author's Workplace:Nanjing Forestry University, Nanjing 210037, China
Key Words:Bombyx mori, electroantennogram (EAG), equivalent circuit model, sensillum, impedance, amplitude, noise level, signal to noise ratio (SNR)
Abstract:  [Objectives]  To provide a technical basis for revealing the mechanism of olfactory reception, and chemoreceptive behavior in general, in insects. [Methods]  Electroantennogram (EAG) signals of male Bombyx mori were measured after a portion of the antenna had been cut off and a parallel equivalent electrocircuit model of the resultant variations in EAG output were constructed. Correlations between actual EAG signals and the simulated circuit elements were analyzed. [Results]  As long as 10 branches remained in the center of the antenna there was no significant difference in EAG amplitudes compared to an intact antenna. However, removal of additional elements of the antenna significantly decreased EAG amplitudes. Noise levels tended to increase, and SNR to decrease, as the number of antenna branches decreased. EAG amplitudes decreased in a linear fashion, as the number of branches on the center of the antenna decreased below 10. Removal of the top portion of the antenna trunk caused the EAG amplitude to increase and the noise level to decrease, thereby enhancing SNR. Removal of a basal portion of the antenna trunk caused EAG amplitude to decrease and the noise level to increase, thereby reducing SNR. A parallel equivalent electrocircuit model of EAG output, based on the impedance of the antenna trunk and branches, was constructed, that simulated the experimental results. [Conclusion]  The impedance of the antenna trunk and branches have a great influence on the strength of the EAG signal. With some modifications, the parallel equivalent electrocircuit model developed in this study should be applicable to the experimental analysis of the EAG output of other insects.
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