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In situ mapping of community-level cellular response with catalytic microbiosensors
S F Peteu1, M T Widman, R M Worden
1Department of Chemical Engineering, Michigan State University, East Lansing 48824, USA. peteu@egr.msu.edu
Biosensors & Bioelectronics
|January 1, 1999
Summary
This study measures chemical gradients and cell movement during chemotaxis using microelectrodes. A new needle-type microbiosensor design improves durability for studying cell migration and gradients.
Area of Science:
- Microbiology
- Biophysics
- Chemical Engineering
Background:
- Chemotaxis, or cell migration along chemical gradients, is crucial in various biological and environmental processes.
- Accurate measurement of chemoattractant gradients and cellular responses is vital for understanding chemotaxis.
- Microelectrodes and microbiosensors offer high spatial resolution for gradient mapping.
Purpose of the Study:
- To measure solute concentration gradients and cellular profiles during bacterial chemotaxis.
- To evaluate the performance and durability of microbiosensors in semi-solid gels.
- To develop a more rugged microbiosensor for improved field applications.
Main Methods:
- Utilized Clark-type amperometric microelectrodes and microbiosensors to detect solute gradients.
- Employed a computerized image analysis system to track cellular concentration profiles.
- Analyzed scanning electron micrographs (SEM) to assess micro(bio)sensor degradation over time.
Main Results:
- Experimental measurements of solute gradients and cell distribution correlated well with a mathematical transport model.
- Observed degradation of micro(bio)sensor tips after prolonged use, including particle adhesion and bio-interface separation.
- Demonstrated the feasibility of a needle-type microbiosensor for enhanced durability.
Conclusions:
- Microelectrodes and microbiosensors are effective tools for studying chemotaxis and associated gradients.
- Sensor degradation is a significant challenge for long-term in-situ measurements.
- The developed needle-type microbiosensor offers improved ruggedness for future chemotaxis research.