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Updated: Sep 25, 2025
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A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients
Published on: April 19, 2010
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Pulsatile reverse flow actuated microfluidic injector: toward the application for single-molecule chemotropism assay
Naoki Yanagisawa1, Elena Kozgunova2, Tetsuya Higashiyama1,2,3
1Institute of Transformative Bio-Molecules (ITbM), Nagoya University Japan ny@nagoya-u.jp.
RSC Advances
|April 28, 2022
Summary
This study introduces a new microfluidic device for precisely delivering chemical signals to growing cells. This innovation enables detailed observation of cellular responses to single molecules.
Area of Science:
- Cellular Biology
- Microfluidics
- Biotechnology
Background:
- Traditional microfluidic sample injection uses electrokinetic methods, limiting applications to non-living biological studies.
- Studying directional cellular growth in response to specific molecular cues requires precise control over stimulus delivery.
Purpose of the Study:
- To develop a novel microfluidic injector coupled with a cell culture chamber for studying chemotropic pollen tube growth.
- To enable single-molecule resolution analysis of cellular responses to ligand-receptor interactions.
Main Methods:
- A microfluidic device was engineered with a syringe pump for unidirectional flow and an on-chip electro-osmotic pump for pulsatile reverse flow.
- This system allows controlled transfer of sample plugs into a cell culture chamber containing chemotropic pollen tubes.
Main Results:
- The device successfully achieved controlled sample plug injection into the cell culture chamber.
- The system demonstrated the capability to deliver stimuli at high spatiotemporal resolution for observing cellular responses.
Conclusions:
- The developed microfluidic system overcomes limitations of electrokinetic injection, enabling new avenues for studying cellular growth dynamics.
- This technology facilitates high-resolution investigation of cellular responses to chemical gradients, advancing our understanding of ligand-receptor interactions.
