Bacteriophage Detection
Bacteriophage Detection - Related Videos
09:17
Detection of Bacteriophages in Environmental Samples
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Alex Wassimi Viruses are a unique group of biological entities that infect both eukaryotic and prokaryotic organisms. They are obligate parasites that have no metabolic capacity, and in order to replicate, rely on host metabolism to produce viral parts that self-assemble inside host cells. Viruses are ultramicroscopic—too small to be viewed with the light microscope, visible only with...
03:36
Purification of Bacteriophages Using a Sucrose Density Gradient
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2026
Source: Rustad, M., et.al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017)This video demonstrates the purification of bacteriophages from a suspension containing host bacterial debris using a sucrose density gradient. It shows how the density gradient separates phages by buoyant density, enabling recovery of a visible band for resuspension and further analysis.
04:08
Purification of Bacteriophages from Bacterial Lysate
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2026
Source: Pett, N., et al. T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo. J. Vis. Exp. (2024)This video demonstrates the purification of bacteriophages from bacterial cell lysates using sequential centrifugation, membrane filtration, chloroform extraction, centrifugal filtration, and buffer exchange to obtain a purified phage preparation.
00:43
Lysogenic Cycle of Bacteriophages
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2019
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
03:25
Quantitative Polymerase Chain Reaction to Enumerate Bacteriophages
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2025
In this video, we discuss the quantitative polymerase chain reaction, qPCR, to enumerate T7 bacteriophages through DNA quantification. The fluorescent dye in the PCR mixture binds with the newly synthesized DNA strands and emits fluorescence, which is measured.
FAQs
Plaque formation provides evidence that phages can lyse susceptible bacterial cells, while molecular methods amplify and identify phage nucleic acids. These approaches measure different signals, so applying both can reveal whether environmental changes involve phage activity, genetic presence, or both. This combined perspective helps interpret viral population patterns across environmental samples.
A susceptible bacterial host provides the cells that phages must infect and lyse for plaques to form. The assay therefore reflects phages capable of acting on that particular host, making host selection important for interpreting results. Plaque patterns can consequently contribute to understanding host associations within environmental microbial communities.
Host associations connect viral observations with the bacterial communities in which phages operate. Identifying these relationships helps environmental scientists examine how phages may influence bacterial population control and virus-mediated processes. This context is especially valuable when comparing microbial communities or investigating how viral populations change across water, soil, wastewater, and other habitats.
Begin by deciding whether the study requires evidence of phage activity, identification of phage nucleic acids, or both. Plaque-based testing uses susceptible bacterial cells to reveal lysis, whereas molecular testing amplifies and identifies nucleic acids. Applying the selected approach to water, soil, wastewater, or other samples aligns the measurement with the environmental question.
Measurements from water, soil, wastewater, and other habitats can be compared to examine differences in phage abundance, host associations, and viral population changes. Such comparisons help researchers relate viral patterns to the characteristics of microbial communities in each setting. The resulting contrasts can also guide studies of virus-mediated processes across environmental systems.
Environmental scientists can use phage measurements to examine how pollution relates to changes in viral populations and associated microbial communities. Comparing detection results among affected or contrasting environmental samples may reveal shifts in phage abundance or host associations. These observations provide a microbiological perspective for investigating pollution impacts without relying on viral measurements alone.
Detection data provide information about phage abundance, host associations, and viral population changes that can support studies of virus-mediated processes involved in microbial communities and nutrient cycling. The same information may help evaluate phages as tools for microbial monitoring or biocontrol. These applications extend detection from measurement toward environmental interpretation and management.