Catalase Test
Catalase Test - Related Videos
10:58
Isolation of Fecal Bacteria from Water Samples by Filtration
0 Views •
2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner The quality of water destined for use in agricultural, recreational, and domestic settings is of great importance due to the potential for outbreaks of waterborne disease. Microbial agents implicated in such events include parasites, bacteria, and viruses that are shed in high numbers in the feces of infected people and animals. Transmission to new and susceptible hosts may...
03:10
An Assay to Study the Impact of Photodynamic Treatment with a Photosensitizer on Macrophage Metabolic Activity
0 Views •
2025
Source:Uju L. Madu1, Nozethu Mjokane1, Maphori Maliehe1, Olihile M. Sebolai11Department of Microbiology and Biochemistry, University of the Free State.The video demonstrates a technique for evaluating the influence of photodynamic treatment (PDT) with a photosensitizer on the metabolic activity of murine macrophages. The cells undergo treatment with the photosensitizer followed by exposure to UV light, initiating PDT. This process triggers the photosensitizer to generate reactive oxygen species...
07:58
Quantifying Fibrillar Collagen Organization with Curvelet Transform-Based Tools
0 Views •
Cited by 10 •
2020
Here, we present a protocol to use a curvelet transform-based, open-source MATLAB software tool for quantifying fibrillar collagen organization in the extracellular matrix of both normal and diseased tissues. This tool can be applied to images with collagen fibers or other types of line-like structures.
09:30
Microbial Control and Monitoring Strategies for Cleanroom Environments and Cellular Therapies
0 Views •
Cited by 2 •
2023
The protocol summarizes the best practices to minimize microbial bioburden in a cleanroom environment and includes strategies such as environmental monitoring, process monitoring, and product sterility testing. It is relevant for manufacturing and testing facilities that are required to meet current good tissue practice standards and current good manufacturing practice standards.
16:41
Detecting, Visualizing and Quantitating the Generation of Reactive Oxygen Species in an Amoeba Model System
0 Views •
Cited by 13 •
2013
We adapted a set of protocols for the measurement of reactive oxygen species (ROS) that can be applied in various amoeba and mammalian cellular models for qualitative and quantitative studies.
FAQs
Hydrogen peroxide creates the selective challenge that reveals catalase activity. If microbial cells produce catalase, the enzyme protects them by converting hydrogen peroxide into water and oxygen. The released oxygen appears as bubbles, linking the visible reaction to an underlying protective process rather than treating bubbling as an unexplained identification signal.
A rapid appearance of bubbles supports a catalase-positive result, while no visible bubbling supports a catalase-negative result under the test conditions. These outcomes indicate whether the sampled microorganism produces detectable catalase, but they do not by themselves establish the organism’s complete identity. Environmental classification therefore commonly combines this reaction with additional tests.
The timing of the visible reaction helps distinguish a strong, readily observable response from an absent response. Rapid bubbling indicates that oxygen is being released soon after hydrogen peroxide contacts the microbial sample. This makes the assay useful for quick screening, while the result still requires careful interpretation alongside other information about the isolate.
A microbial sample is brought into contact with hydrogen peroxide, and the mixture is observed for visible bubble formation. The observation is then recorded as supporting catalase-positive or catalase-negative classification. Because the assay is intended to help identify isolates, its result should be incorporated with additional tests rather than treated as a complete identification procedure.
Environmental scientists can apply the assay to microorganisms recovered from soil, water, and other habitats. By separating isolates according to detectable catalase production, they obtain a biochemical characteristic that supports microbial classification. This information helps organize environmental samples for further study of their organisms and microbial composition.
The reaction provides a simple biochemical trait for examining microorganisms in environmental samples. In microbial community studies, catalase results can contribute to classifying recovered organisms and comparing the organisms present in different habitats. In bioremediation investigations, the same information helps characterize microorganisms relevant to studying or managing contaminated environments, when combined with other analyses.