Cfu Quantification
Cfu Quantification - Related Videos
03:31
Methyl Cellulose-Based CFU Assay: A Method to Determine the Effect of Anti-cancer Compounds on Colony Formation in Leukemic Cells
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2023
This video describes the protocol for methyl cellulose-based colony formation unit or CFU assay, which helps identify and count the number of colonies formed by leukemic cells in response to the treatment with anticancer compounds.
08:44
Invertebrate Lifespan Quantification
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2023
Many animals naturally stop growing upon reaching adulthood, after which they undergo aging or "senescence" until dying. The amount of time between an organism\'s birth and death is called its lifespan, which can be influenced by various biological and environmental factors. By exposing organisms to different growth conditions, scientists can better understand the factors affecting lifespan. Flies and worms are ideal organisms to perform such experiments, given their short generation time and...
07:58
Use of Image Cytometry for Quantification of Pathogenic Fungi in Association with Host Cells
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Cited by 1 •
2013
Here, we demonstrate how image cytometry can be used for quantification of pathogenic fungi in association with host cells in culture. This technique can be used as an alternative to CFU enumeration.
07:47
ScanLag: High-throughput Quantification of Colony Growth and Lag Time
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Cited by 66 •
2014
ScanLag is a high-throughput method for measuring the delay in growth, namely lag time, as well as the growth rate of colonies for thousands of cells in parallel. Screening using ScanLag enables the discrimination between long lag-time and slow growth at the level of a single variant.
04:06
Preparation and Quantification of Mycobacterium bovis BCG lux Inoculum for Infection
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2025
This video demonstrates the preparation and quantification of Mycobacterium bovis Bacillus Calmette-Guérin lux inoculum using bioluminescence assay and the enumeration of colony-forming units. The prepared inoculum can be used for infection studies.
FAQs
Serial dilution brings microbial concentrations into a range where colonies can be counted on solid growth medium. The resulting count is interpreted alongside the dilution used and the amount of sample plated to estimate viable units in the original material. This makes infectious-burden or survival measurements more meaningful than attempting to count an overly concentrated sample.
A visible colony can develop from one microorganism or from a cluster of microorganisms that remains together during processing. Consequently, CFU values represent viable colony-forming units rather than a direct census of individual cells. This distinction matters when comparing samples, because changes in clustering or aggregation could affect the relationship between counted colonies and actual cell numbers.
Incubation under defined conditions provides a consistent setting for viable microorganisms to produce colonies on the selected solid growth medium. Because CFU quantification depends on colonies becoming visible and countable, maintaining the specified incubation conditions supports comparable measurements across samples. The resulting values can then be used to assess microbial survival or infectious burden.
A typical workflow begins with preparing serial dilutions of the sample, followed by plating diluted material onto solid growth medium. The plates are incubated under defined conditions until colonies can be counted, and counts from a suitable range are used to report CFU per milliliter or gram. This sequence connects the original sample to a standardized viable-unit estimate.
Researchers use CFU quantification to follow pathogen replication in microbial cultures or infected tissues. Measurements taken across experimental conditions can indicate whether viable infectious material increases, decreases, or remains controlled. In immunology and infection research, this makes the method useful for examining microbial survival alongside the effectiveness of host immune control.
Comparing CFU results between treated and untreated samples provides a measurement of viable microbial burden after antimicrobial exposure. A lower reported value in the treatment condition is consistent with reduced recoverable viability, whereas persistence of CFUs indicates that viable units remain. The approach therefore links treatment conditions to microbial survival outcomes in cultures or infected tissues.