Photoelectron microscopy of cell surface topography

Area of Science:

• Cell Biology
• Microscopy Techniques
• Surface Science

Background:

• Traditional electron microscopy can be limited by sample preparation artifacts.
• Understanding cell surface topography is crucial for cell biology research.
• Photoelectron microscopy offers a potential alternative for high-resolution imaging.

Purpose of the Study:

• To evaluate the utility of photoelectron microscopy for imaging cell surface topography.
• To investigate the role of relief contrast in photoelectron imaging of cells.
• To determine the effective working depth of field in photoelectron microscopy of cells.

Main Methods:

• Preparation of mouse 3T3 cells and chick embryo fibroblasts with gold-palladium coating.
• Acquisition of photoelectron micrographs.
• Analysis of cell morphology and surface relief using transmission electron micrograph stereo-pairs.
• Measurement of cell heights from stereo-pairs to quantify parallax.

Main Results:

• Photoelectron micrographs clearly depicted cell morphology due to relief contrast, as gold-palladium coating suppressed work function differences.
• Cell heights measured from stereo-pairs confirmed the presence of significant surface relief.
• The study demonstrated high sensitivity of photoelectron microscopy to fine surface topography details.
• Working depth of field was found not to be a limiting factor for imaging well-spread cells.

Conclusions:

• Photoelectron microscopy is a valuable tool for visualizing fine cell surface topography.
• Relief contrast is the primary mechanism for image formation in gold-palladium coated cells.
• The technique offers a non-limiting depth of field for imaging spread tissue culture cells.