Rotation of single bacterial cells relative to the optical axis using optical tweezers

Area of Science:

• Biophysics
• Optical manipulation
• Microscopy

Background:

• Optical tweezers are essential tools for manipulating microscopic objects.
• Understanding bacterial cell structure and dynamics requires advanced imaging techniques.

Purpose of the Study:

• To demonstrate a novel method for trapping and rotating bacterial cells using optical tweezers.
• To enable new perspectives for analyzing subcellular structures in three dimensions.

Main Methods:

• Utilizing a single-beam, oscillating optical tweezers setup.
• Trapping and rotating rod-shaped bacterial cells along the optical axis.
• Measuring the angle of rotation (θ) from longitudinal cell intensity profiles in phase-contrast images.

Main Results:

• Successfully trapped and rotated bacterial cells.
• Demonstrated that the rotation angle (θ) is dependent on the oscillation amplitude.
• Validated the measurement of θ using cell intensity profiles.

Conclusions:

• The developed technique allows for controlled rotation of bacterial cells.
• This method provides a novel approach for obtaining different cellular perspectives.
• Offers a valuable tool for 3D subcellular structure analysis in fluorescence microscopy.