Bacterial Cell Fixation
Bacterial Cell Fixation - Related Videos
07:54
Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation
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Cited by 14 •
2015
Here, we present a protocol on how to determine the quantity and distribution of metals in a sample using synchrotron X-ray fluorescence. We focus on adherent cells, and describe the chemical fixation method to prepare this sample. We then describe how to mount and image the sample using synchrotron X-rays.
14:23
Electron Cryotomography of Bacterial Cells
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Cited by 21 •
2010
We illustrate here how to use electron cryotomography (ECT) to study the ultrastructure of bacterial cells in near-native states, to "macromolecular" (~4 nm) resolution.
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
03:05
Detection of Bacterial Adherence to Host Cells Using Fluorescence Imaging
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2025
This video demonstrates the bacterial adherence assay to evaluate GFP-tagged bacterial adherence to epithelial cell culture to study the dynamics of host-pathogen interactions using fluorescence microscopy-based imaging.
08:39
Electroporation of Functional Bacterial Effectors into Mammalian Cells
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Cited by 7 •
2015
Electroporation was used to insert purified bacterial virulence effector proteins directly into living eukaryotic cells. Protein localization was monitored by confocal immunofluorescence microscopy. This method allows for studies on trafficking, function, and protein-protein interactions using active exogenous proteins, avoiding the need for heterologous expression in eukaryotic cells.
FAQs
Chemical agents such as formaldehyde and glutaraldehyde stabilize cells by cross-linking proteins and other cellular components. Heat instead denatures and immobilizes cell material. Because these mechanisms modify cellular structures in different ways, they can produce different effects on bacterial morphology, staining behavior, and the preservation of molecular features examined during later processing.
Cross-linking can stabilize proteins and other components so effectively that antibodies or stains have less access to intracellular features. Fixation may also alter the cell envelope, which influences how reagents reach the cell interior. This tradeoff matters when preserving spatial organization must be balanced against detecting molecular targets during immunostaining or related analyses.
The selected agent or treatment can affect cell size, shape, envelope structure, and the availability of features recognized by stains. These changes influence results in methods such as Gram staining and microscopy. Consistent fixation conditions therefore help distinguish biological differences from preparation-related variation and improve the reproducibility of observations across samples.
Selection should reflect the structure or molecular feature that must remain accessible and the downstream examination being planned. Chemical cross-linkers may provide strong stabilization, whereas heat produces denaturation and immobilization. Because each condition can influence morphology, staining, and intracellular access, the fixation approach should be matched to microscopy, staining, or molecular detection requirements.
A general workflow is to preserve the bacterial sample with a selected chemical agent or heat treatment, then proceed with the intended examination or staining method. The preserved cells can support microscopy, Gram staining, immunostaining, or electron microscopy. Throughout processing, the condition should maintain recognizable size, shape, and spatial organization without compromising the feature being measured.
Fixed bacterial cells are used in light-based microscopy, Gram staining, immunostaining, and electron microscopy. Fixation allows these procedures to examine cells without continued growth or degradation during processing. In biology, the resulting preparations support analysis of cellular structure, spatial organization, and selected molecular features, while also providing more reproducible comparisons between samples.