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Paper Abstract and Keywords
Presentation 2010-12-19 15:45
Statistical Analysis of Chemotaxis in Drosophila Larvae
Tomomitsu Takashina (Tokyo Inst. of Tech.), Takako Morimoto, Hiroyoshi Miyakawa (Tokyo Univ of Pharm. and Life Sci), Toru Aonishi (Tokyo Inst. of Tech.) MBE2010-77 NC2010-88
Abstract (in Japanese) (See Japanese page) 
(in English) Animals continuously collect and process information on the enviroment, e.g. luminance, temperature and chemical concentration, and translate them into proper behavioral actions. In particular, chemotaxis is the phenomenon in which animals direct their movements in response to concentration gradient of chemoattractants. In this study, we statistically analyzed the chemotaxis mechanisms in Drosophila larvae by composing hidden malkov models describing discreate transitions between forward and rotary motions in the chemotaxis. Here, this model was built under the assumption that a transition probability from forward to rotary motions can be formulated as a formal neuron model containing a moving average (MA) filter entered time sequence of chemical concentrations. Then, by using chemotaxis data measured from {\it CantonS }(wild type) and {\it Or83b} (olfactory mutant), we estimated its model parameters with Baum-Welch algorithm and we selected the lenght of the MA filter with Akaike information criteria. In the case of wild types, the length of estimated filters was one or two, and espcially in second-order filters, time differential filters were extracted. On the other hand, in the case of olfactory mutants, the length of estimated filters was zero, which suggests that the mutants use no information of odorant.
Keyword (in Japanese) (See Japanese page) 
(in English) Drosophila larva / chemotaxis / Hidden Markov Model / Baum-Welch algrithm / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 355, NC2010-88, pp. 127-132, Dec. 2010.
Paper # NC2010-88 
Date of Issue 2010-12-12 (MBE, NC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MBE2010-77 NC2010-88

Conference Information
Committee NC MBE  
Conference Date 2010-12-19 - 2010-12-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2010-12-NC-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Statistical Analysis of Chemotaxis in Drosophila Larvae 
Sub Title (in English)  
Keyword(1) Drosophila larva  
Keyword(2) chemotaxis  
Keyword(3) Hidden Markov Model  
Keyword(4) Baum-Welch algrithm  
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1st Author's Name Tomomitsu Takashina  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Takako Morimoto  
2nd Author's Affiliation Tokyo University of Pharmacy and Life Science (Tokyo Univ of Pharm. and Life Sci)
3rd Author's Name Hiroyoshi Miyakawa  
3rd Author's Affiliation Tokyo University of Pharmacy and Life Science (Tokyo Univ of Pharm. and Life Sci)
4th Author's Name Toru Aonishi  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2010-12-19 15:45:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # MBE2010-77, NC2010-88 
Volume (vol) vol.110 
Number (no) no.354(MBE), no.355(NC) 
Page pp.127-132 
#Pages 6 
Date of Issue 2010-12-12 (MBE, NC) 

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