Focused ion beams in biology

Area of Science:

• Biological imaging
• Nanotechnology
• Cellular ultrastructure

Background:

• Focused ion beams (FIB) technology, traditionally used in materials science, is now emerging as a powerful tool for biological imaging.
• Advancements in FIB technology enable high-resolution ultrastructural analysis of cellular and tissue architecture.

Purpose of the Study:

• To provide a comprehensive primer on the application of FIB in biological research.
• To highlight the practical aspects and potential of FIB for nanoscale cellular imaging.

Main Methods:

• Utilizing focused ion beams for progressive material removal to create freshly exposed surfaces for scanning electron microscopy (SEM).
• Employing FIB as a sculpting tool to prepare specific specimen shapes (e.g., lamellae, needles) for advanced microscopy and chemical analysis.
• Investigating three-dimensional cell and tissue architecture in plastic-embedded or plunge-frozen samples.

Main Results:

• Demonstrated the capability of FIB-SEM for detailed 3D ultrastructural imaging of biological specimens.
• Showcased FIB's utility in preparing samples for transmission electron microscopy (TEM) and chemical composition analysis.
• Provided practical guidance for implementing FIB technology in biological laboratories.

Conclusions:

• Focused ion beams represent a significant technological advancement for nanoscale cellular imaging in biology.
• FIB technology facilitates novel insights into subcellular organization and the mechanisms of host-pathogen interactions.
• The integration of FIB into biological workflows opens new avenues for high-resolution structural and compositional analysis.