Bead-bacteria Complexes
Bead-bacteria Complexes - Related Videos
04:06
Assessing Bacteria-Host Cell Interactions Using Biomimetic Beads
0 Views •
2025
Source: Stones, D. H., et al. Biomimetic Materials to Characterize Bacteria-host Interactions. J. Vis. Exp. (2015)This video demonstrates the use of bacteriomimetic beads to quantify bacterial adhesion to host epithelial cells under competitive conditions. It outlines the steps involved in treating the cells, lysing them, and plating serial dilutions to measure colony-forming units.
03:37
Isolation of Phagosomes Containing Magnetic Bead-Tagged Bacteria from Infected Macrophages
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2026
Source: Gutiérrez, S., et al., Isolation of Salmonella typhimurium-containing Phagosomes from Macrophages. J. Vis. Exp. (2017)This video demonstrates the magnetic isolation of phagosomes containing biotin–streptavidin bead–coated bacteria from infected macrophages. The protocol includes buffer treatments, cell disruption, magnetic separation, and washing to yield purified phagosomes for analysis.
11:09
Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
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Cited by 5 •
2011
We describe a multiplex method for the detection of microorganisms within a sample using oligonucleotide-coupled fluorescent beads. Amplicon from all organisms within a sample is hybridized to a panel of probe-coupled beads. A Luminex or Bio-Plex instrument is used to query each bead for bead type and hybridization signal.
04:33
3D Culture of Porcine COCs: A Procedure to Encapsulate Cumulus Oocyte Complexes in Fibrin-alginate Polymer Hydrogel Beads
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2025
This video describes the protocols for encapsulating porcine cumulus-oocyte complexes (COCs) in fibrin-alginate beads to establish a 3D culture. This in-vitro maturation system maintains normal cell-to-cell communication, ensuring oocyte maturation and retaining viability.
08:48
Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
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2020
This article describes the experimental procedures for (a) depletion of U1 snRNP from nuclear extracts, with concomitant loss of splicing activity; and (b) reconstitution of splicing activity in the U1-depleted extract by galectin-3 - U1 snRNP particles bound to beads covalently coupled with anti-galectin-3 antibodies.
FAQs
Physical adsorption can associate bacterial cells or surface components with bead material, while chemical coupling creates a more deliberate attachment through a chemical linkage. These alternatives affect how consistently bacterial material remains presented on the particle. Selecting or comparing them helps investigators assess whether immune-cell responses reflect bacterial surface recognition rather than uncontrolled variation in particle association.
A consistent particle format makes exposure easier to standardize across wells or experimental conditions. Bead-associated bacterial surfaces are presented on particles with a more controlled size and particulate structure than a less standardized bacterial preparation. This helps separate responses related to surface recognition from effects caused by differences in particle dimensions or the amount of material encountered by immune cells.
Characterizing stability asks whether the association remains sufficiently intact during the assay and whether bacterial material stays presented on the beads. Changes in stability could alter the particles encountered by immune cells, making uptake or inflammatory measurements harder to interpret. Stability assessment therefore supports reproducibility and helps distinguish a biological response from variation in complex integrity.
Compared with studying bacteria alone, these complexes allow particle size and exposure to be controlled while bacterial surface components remain available for examination. That distinction is useful when an experiment focuses on how immune cells recognize or ingest particulate bacterial material. The complexes provide a controlled format for linking surface presentation with cellular responses.
Preparation begins by bringing bacterial cells or their surface components together with microscopic beads under conditions that permit physical adsorption or chemical coupling. The resulting particles are then characterized for stability and bacterial presentation before use in an assay. This workflow creates a defined test material and checks that the intended bacterial material remains associated with the beads.
In immunology and infection studies, investigators can expose immune cells to the complexes and evaluate recognition, uptake, phagocytosis, or inflammatory responses. Because the particle format reduces variation in size and exposure, differences between experimental conditions can be interpreted more consistently. The approach is especially useful for in vitro assays requiring reproducible presentation of bacterial surfaces.