Related Experiment Videos
Single-molecule fluorescence observed with mercury lamp illumination
M Unger1, E Kartalov, C S Chiu
1California Institute of Technology, Pasadena, USA.
Biotechniques
|November 26, 1999
Summary
Researchers can now observe single fluorescent molecules with standard fluorescence microscopes and affordable cooled charge-coupled device (CCD) cameras. This breakthrough enables detailed study of individual molecules like tetramethyl-rhodamine and green fluorescent protein.
Area of Science:
- Biophysics
- Optical Microscopy
- Molecular Imaging
Background:
- Single-molecule detection is crucial for understanding molecular behavior.
- Traditional methods often require specialized and expensive equipment.
Purpose of the Study:
- To demonstrate the feasibility of observing single fluorescent molecules using accessible microscopy setups.
- To identify suitable fluorescent dyes and proteins for single-molecule imaging.
Main Methods:
- Utilized a standard fluorescence microscope with mercury lamp excitation.
- Employed an inexpensive cooled charge-coupled device (CCD) camera for detection.
- Observed immobilized single molecules in various environments.
Main Results:
- Successfully visualized individual molecules of tetramethyl-rhodamine, rhodamine 6G, fluorescein isothiocyanate, and green fluorescent protein.
- Demonstrated single-molecule observation in both air and aqueous solutions.
- Confirmed the capability of the affordable setup for single-molecule fluorescence detection.
Conclusions:
- Standard fluorescence microscopes equipped with cooled CCD cameras are sufficient for single-molecule observation.
- This accessible technique broadens the scope of single-molecule studies.
- Facilitates advanced research in molecular dynamics and interactions.