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The shallow turn of a worm

Title
The shallow turn of a worm
Authors
Kim D.Park S.Mahadevan L.Shin J.H.
Ewha Authors
박성수
Issue Date
2011
Journal Title
Journal of Experimental Biology
ISSN
0022-0949JCR Link
Citation
vol. 214, no. 9, pp. 1554 - 1559
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
When crawling on a solid surface, the nematode Caenorhabditis elegans (C. elegans) moves forward by propagating sinusoidal dorso-ventral retrograde contraction waves. A uniform propagating wave leads to motion that undulates about a straight line. When C. elegans turns as it forages or navigates its environment, it uses several different strategies of reorientation. These modes include the well-known omega turn, in which the worm makes a sharp angle turn forming an -shape, and the reversal, in which the worm draws itself backwards. In these two modes of reorientation, C. elegans strongly disrupts its propagating sinusoidal wave, either in form or in direction, leading to abrupt directional change. However, a third mode of reorientation, the shallow turn, involves a gentler disruption of the locomotory gait. Analyzing the statistics of locomotion suggests that the shallow turn is by far the most frequent reorienting maneuver in navigation in the absence of food. We show that the worm executes a shallow turn by modulating the amplitude and wavelength of its curvature during forward movement, and provide a minimal description of the process using a three-parameter mathematical model. The results of our study augment the understanding of how these parameters are controlled at the neuromotor circuit level. © 2011. Published by The Company of Biologists Ltd.
DOI
10.1242/jeb.052092
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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