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Micromachines
Volume 7
Issue 3
10.3390/mi7030050
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Article

Microfluidic Device to Measure the Speed of C. elegans Using the Resistance Change of the Flexible Electrode

by
Jaehoon Jung
1,7,*,
Masahiro Nakajima
2,
Masaru Takeuchi
1,
Zoran Najdovski
3,
Qiang Huang
6 and
Toshio Fukuda
4,5,6
1
Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
2
Center for Micro-Nano Mechatronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
3
Center for Intelligent Systems Research, Deakin University, Waurn Ponds, Geelong 3216, Australia
4
Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
5
Department of Mechatronics Engineering, Meijo University, Shiogamaguchi, Tenpa-ku, Nagoya 468-0073, Japan
6
Intelligent Robotics Institute, School of Mechatronic Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, China
7
Medical Device Development Center, Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), 80 Cheombok-Ro, Dong-gu, Daegu 41061, Korea
*
Author to whom correspondence should be addressed.
Micromachines 2016, 7(3), 50; https://doi.org/10.3390/mi7030050
Submission received: 29 October 2015 / Revised: 24 February 2016 / Accepted: 10 March 2016 / Published: 19 March 2016
(This article belongs to the Special Issue Micro/Nano Robotics)
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Abstract

This work presents a novel method to assess the condition of Caenorhabditis elegans (C. elegans) through a resistance measurement of its undulatory locomotion speed inside a micro channel. As the worm moves over the electrode inside the micro channel, the length of the electrode changes, consequently behaving like a strain gauge. In this paper, the electrotaxis was applied for controlling the direction of motion of C. elegans as an external stimulus, resulting in the worm moving towards the cathode of the circuit. To confirm the proposed measurement method, a microfluidic device was developed that employs a sinusoidal channel and a thin polydimethylsiloxane (PDMS) layer with an electrode. The PDMS layer maintains a porous structure to enable the flexibility of the electrode. In this study, 6 measurements were performed to obtain the speed of an early adult stage C. elegans, where the measured average speed was 0.35 (±0.05) mm/s. The results of this work demonstrate the application of our method to measure the speed of C. elegans undulatory locomotion. This novel approach can be applied to make such measurements without an imaging system, and more importantly, allows directly to detect the locomotion of C. elegans using an electrical signal (i.e., the change in resistance).
Keywords: microfluidic device; C. elegans; flexible electrode microfluidic device; C. elegans; flexible electrode

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MDPI and ACS Style

Jung, J.; Nakajima, M.; Takeuchi, M.; Najdovski, Z.; Huang, Q.; Fukuda, T. Microfluidic Device to Measure the Speed of C. elegans Using the Resistance Change of the Flexible Electrode. Micromachines 2016, 7, 50. https://doi.org/10.3390/mi7030050

AMA Style

Jung J, Nakajima M, Takeuchi M, Najdovski Z, Huang Q, Fukuda T. Microfluidic Device to Measure the Speed of C. elegans Using the Resistance Change of the Flexible Electrode. Micromachines. 2016; 7(3):50. https://doi.org/10.3390/mi7030050

Chicago/Turabian Style

Jung, Jaehoon, Masahiro Nakajima, Masaru Takeuchi, Zoran Najdovski, Qiang Huang, and Toshio Fukuda. 2016. "Microfluidic Device to Measure the Speed of C. elegans Using the Resistance Change of the Flexible Electrode" Micromachines 7, no. 3: 50. https://doi.org/10.3390/mi7030050

APA Style

Jung, J., Nakajima, M., Takeuchi, M., Najdovski, Z., Huang, Q., & Fukuda, T. (2016). Microfluidic Device to Measure the Speed of C. elegans Using the Resistance Change of the Flexible Electrode. Micromachines, 7(3), 50. https://doi.org/10.3390/mi7030050

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