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Temperature-controlled perfusion apparatus for microscope using transparent conducting film heater
1Department of Physics, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan.
The American Journal of Physiology
|January 1, 1989
Summary
A new temperature-controlled perfusion apparatus uses an indium-tin-oxide heater for precise temperature regulation in electrophysiology. This simple device ensures uniform bath temperature for studying cells and membrane patches on microscopes.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- Electrophysiological studies require precise control of cellular microenvironments.
- Maintaining stable temperatures is crucial for accurate measurements of cell and membrane patch activity.
- Existing perfusion systems may lack simplicity, uniformity, or compatibility with standard microscopy setups.
Purpose of the Study:
- To develop and characterize a novel, simple, and effective temperature-controlled perfusion apparatus for electrophysiological experiments.
- To enable precise temperature regulation of both the perfusion solution and the sample chamber.
- To integrate the apparatus seamlessly with inverted microscopy for live-cell imaging and analysis.
Main Methods:
- Utilized a transparent conducting film of indium-tin-oxide (ITO) as a heating element on a glass substrate.
- Designed a compact apparatus (12 mm height) for direct heating of a 1 ml bath chamber and preheating of perfusion solutions.
- Incorporated a control unit for regulating bath solution temperature (ambient to >37°C) with ±1°C accuracy, minimizing electrical noise.
Main Results:
- Achieved uniform temperature distribution within the 6 x 12 mm² working area of the bath chamber.
- Demonstrated reliable temperature control from ambient to above 37°C with high accuracy.
- The apparatus's modular design allows for easy interchangeability of bath chambers for diverse microscopic applications.
Conclusions:
- The novel ITO-based perfusion apparatus offers a structurally simple and efficient solution for temperature control in electrophysiology.
- Its design ensures temperature uniformity and compatibility with standard inverted microscopes, facilitating advanced cell and membrane studies.
- The apparatus is versatile for various microscopic studies involving cells in static solutions, enhancing experimental reproducibility and data quality.