A confocal pinhole is a key structural component of a confocal microscope that is used to reject out-of-focus background fluorescence. By eliminating this out-of-focus flare, the pinhole enables the microscope to capture thin ($$<1$$ μm), unblurred optical sections, which greatly enhances the effective sensitivity and resolution when viewing thick specimens compared to traditional fluorescence microscopy.

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A confocal microscope is a type of light microscope that uses a laser to successively scan multiple depths, known as z-planes, producing numerous two-dimensional, high-resolution images that a computer constructs into a three-dimensional model. Like fluorescence microscopes, they generally use fluorescent stains to increase contrast and resolution. By utilizing a confocal pinhole (a narrow aperture) to reject out-of-focus background light, confocal microscopes capture thin ($$<1$$ μm), unblurred optical sections. This capability makes them highly useful for examining thick, living specimens such as biofilms, which cannot be observed well using traditional light microscopy because slicing them to create thinner specimens might kill or disturb the microbial community. However, they still lack the resolution required for viewing extremely thick intact tissue samples.

Confocal Microscopes

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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