Bacterial Cell Isolation
Bacterial Cell Isolation - Related Videos
02:56
Isolation of Mouse Bladder Epithelial Cells Containing Intracellular Bacterial Communities
0 Views •
2026
Source: Yang, E., et al. Isolation of Single Intracellular Bacterial Communities Generated from a Murine Model of Urinary Tract Infection for Downstream Single-cell Analysis. J. Vis. Exp. (2019)This video demonstrates the manual isolation of single epithelial cells containing intracellular bacterial communities from infected mouse bladder using mouth micropipetting, enabling downstream single-cell analysis of viable host-associated E. coli populations in urinary tract infection...
05:19
Isolation and Identification of Bacterial Strains from Skin of Terrestrial Amphibians
0 Views •
2025
This is a method for sampling and isolating culturable bacteria from the cutaneous microbiota of European plethodontid salamanders (Speleomantes genus). Here, we present a protocol for sampling salamander skin with swabs and processing them using culturable approaches. We describe sampling, isolation, and establishment of axenic culture with bacterial strain characterization.
14:23
Electron Cryotomography of Bacterial Cells
0 Views •
Cited by 22 •
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.
11:18
Isolation and Preparation of Bacterial Cell Walls for Compositional Analysis by Ultra Performance Liquid Chromatography
0 Views •
Cited by 47 •
2014
The bacterial cell wall is composed of peptidoglycan, a macromolecular network of sugar strands crosslinked by peptides. Ultra Performance Liquid Chromatography provides high resolution and throughput for novel discoveries of peptidoglycan composition. We present a procedure for the isolation of cell walls (sacculi) and their subsequent preparation for analysis via UPLC.
03:24
Isolation of Bacterial Extracellular Vesicles Using Size-Exclusion Chromatography
0 Views •
2025
Source: Watson, D. C., et al. Scalable Isolation and Purification of Extracellular Vesicles from Escherichia coli and Other Bacteria. J. Vis. Exp. (2021)This video demonstrates the use of size exclusion chromatography with porous resin beads to isolate bacterial extracellular vesicles (EVs) from a bacterial culture filtrate. Larger EVs elute early by bypassing the resin pores, while smaller proteins enter the pores and elute later.
FAQs
Dilution reduces the number of bacterial cells entering a given area, while spatial separation keeps cells or small groups apart during growth on solid media. When separation is sufficient, each starting unit can develop into a distinct colony. This physical organization makes it possible to select material from separate colonies for controlled biochemical or microbiological study.
Selective media help favor the growth of target organisms within a mixed sample, whereas differential media help distinguish organisms by visible or detectable differences associated with their growth. These media do not replace physical separation, but they make colony selection more informative. Their use can support the recovery and preliminary differentiation of bacteria relevant to a specific investigation.
A pure or enriched culture reduces interference from unrelated organisms and links measured results more reliably to the bacteria being studied. This is especially important when examining cellular components, enzyme activity, metabolism, or genetic traits. Better-defined cultures improve experimental reproducibility and help investigators interpret whether an observed biochemical property belongs to the intended organism.
The workflow begins with separating cells from a mixed sample through dilution and spatial distribution. The separated material is then grown on solid culture media under conditions suitable for the organisms of interest. Distinct colonies are subsequently recognized and used as the basis for further study, including identification, characterization, or biochemical testing of the resulting culture.
The choice of solid culture medium and the conditions used for growth determine which organisms can develop visible colonies and how clearly those colonies can be distinguished. Appropriate conditions support recovery of the target population, while selective or differential media add useful discrimination. Consequently, isolation quality depends not only on separation but also on conditions that permit informative colony formation.
Bacterial cell isolation is useful when biochemical measurements must be associated with a defined bacterial population rather than a mixed sample. Isolated cultures provide material for studying cellular components, enzyme activity, metabolic behavior, and genetic traits. They also support bacterial identification and characterization, allowing researchers to compare functions and interpret experimental outcomes with greater confidence.